X Board Question Ch: Human Eye and Colourful World

Guess Paper for Board exam 2014

Q. (a) List the factors on which scattering of light depends. (b) What is Tyndals, effect ?

Q. A student sitting on the last bench in a class room cannot read the black board clearly.

(i) Name the kind of defect of vision the student is suffering from.

(ii) Name the type of spherical lens he has to use to correct this defect.

(iii) State two possible reasons for this defect of vision.

Q. Why do stars appear to twinkle while the planets do not ? Explain with the help of diagram.

Q. Explain with the help of diagram why the sun is visible to us two minutes before the actual sun-rise and two minutes after the sunset.

Q. (a) What is meant by power of accommodation of eye ? A person with a defective vision cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision ? Draw a diagram of thus corrected eye. (b) A person having presbyopia uses a bifocal lens to restore proper vision. Which part of the this lens is convex and which part is concave ?

Q. Name the part responsible for the power of accommodation of the human eye.

Q. What is meant by least distance of distinct vision ? How does this vary between the very young and old people ?

Q. Explain why the colour of the clear sky is blue.

Q. State the cause of dispersion, when white light enters a glass prism. Explain with a diagram

Q. What is a rainbow ? When and how is it formed ?

Q. Explain the cause of the red colour of the Sun at Sunrise and Sunset.

Q. List two causes leading to myopia of the eye. Draw ray diagrams to show the image formation in case of defective eye and corrected eye.

Q. We can see the sun for few minutes even after it has actually set. Why ?

Q. A student has difficulty in reading the blackboard while sitting in the last row. What could be the defect of vision the student is suffering from ? What are the causes for this disorder ?

Q. What is meant by power of accommodation of eye ? The minimum power of eye lens is 40D. If the far point of normal eye is infinity find the size of eye ball.

Q. The sky appears dark to the passengers flying at very high attitudes. Why ?

Q. A child has difficulty in reading the blackboard while sitting on the last bench in a class  room. What could be the defect the child is suffering from ? List two main causes of this defect.

Q. State the nature of the image formed at the retina of human eye.

Q. (a) What is the near point of the human eye with normal vision ? (b) Why is a normal eye not able to see clearly the objects placed closer than the near point ?

Q. The sun appears oval (or flattened) at sunrise and sunset, but appears circular at noon. Explain, why ?

Q. A student has difficulty in reading the black board while sitting in the last row

What could be the defect the student is suffering from ? How can it be corrected ? Draw the ray diagrams for (a) defective eye (b) its correction.

Q. State the range of the human eye with a normal vision

Q. Q. “Stars seem higher than they actually are” Explain, why?

Q. What is meant by the power of accommodation of the eye? State the role of ciliary muscles in achieving it.

Q. (a) What is long sightedness? List its causes.  (b) How can it be corrected? Draw the ray diagram for its correction.

Q. Define absolute refractive index of a medium. Light enters from air to water having refractive index 4/3. Find the speed of light in water. The speed of light in vacuum is 3x10⁸ m/s.

Q. With the help of a diagram, explain the formation of a rainbow in the sky.

Q. (i) What is meant by “least distance of distinct vision” ? (ii) How does iris controls the size of the pupil in bright light and dim light ?

Q. A person can see distant sign boards clearly but cannot read clearly a book which is at 25 cm from his eye. Identify the defect. Draw a labelled ray diagram to illustrate how this defect can be corrected.

Q. A person needs a lens of power – 2.5 dioptres for correcting his vision. Name the defect of vision he is suffering from. Which lens will he be using for the correction ? Also find the focal length of the lens. 

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Q1. An object is placed at a distance of 30 cm from a concave mirror of focal length 20 cm. Where will the image be formed?

Q2. A 2.0-cm-high object is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror is 30 cm, and its image is formed 60 cm from the mirror, on the same side of the mirror as the object. Find the height of the image formed.

Q3. A 1.2-cm-long pin is placed perpendicular to the principal axis of a convex mirror of focal length 12 cm, at a distance of 8 cm from it. (a)Find the location of the image. (b)Find the height of the image. (c)Is the image erect or inverted?

Q4. Sunlight is incident on a concave mirror, parallel to its principal axis. The image is formed at a distance of 12cm from the pole. Find the radius of curvature of the mirror.

Q5.An object is placed at a distance of 20cm from a convex mirror of focal length 25cm.Calculate the position of the image. Discuss its nature.

Q5. A 2.0-cm-high object is placed at a distance of 20cm from a concave mirror. A real image is formed at 40cm from the mirror. Calculate the focal length of the mirror and size of the image.

Q6. Find the position, size and the nature of the image formed by a spherical mirror from the following data. u = -20cm f= -15cm ho= 1.ocm .

Q7. A 2-cm-high object is placed at a distance of 32cm from a concave mirror. The image is real, inverted and 3cm in size. Find the focal length of the mirror and the position of the image.

Q8. A concave mirror forms an inverted image of an object placed at a distance of 12cm from it. If the image is twice as large as the object, where is it formed?

Q9. A concave mirror forms an erect image of an object placed at a distance of 10cm from it. The size of the image is double that of the object. Where is the image formed?

Q10. An object is placed at a distance of 12cm from a concave mirror of radius of curvature 6cm.Find the position of the image.

Q11. An object of height 2cm is placed at a distance of 15 cm from a concave mirror of focal length 10 cm.Draw a scale diagram to locate the image. From the diagram, find the length of the image formed.

Q12. The image of an object placed 16 cm from a concave mirror is formed at a distance of 24 cm from the mirror. Calculate the possible focal lengths of the concave mirror from this information.

Q13. An object is placed 20 cm from a convex mirror. Its image is formed 12 cm from the mirror. Find the focal length of the mirror.

Q14.An object is placed at a distance of 12cm from a concave mirror. The image formed is real and four times larger than the object. Calculate the distance of the image from the mirror.

Q15. An object is placed 24cm from a concave mirror. Its image is inverted and doubles the size of the object. Find the focal length of the mirror and the position where the image is formed.

Q16. Where an object should be placed before a concave mirror of focal length 20cm so that a real image is formed at a distance of 60cm from it?

Q17. An object is placed at a distance of 12cm from a convex mirror of radius of curvature 12cm.Find the position of the image.

Q18. If the height of the object in the previous problem is 1.2cm, what will be the height of the image?

Q19. When a concave mirror is placed facing the sun, the sun's rays converge to a point 10cm from the mirror. Now, an erect, 2-cm-long pin is placed 15cm away on the principal axis of the mirror. If you want to get the image of the pin on a card, where would you place the card? What would be the nature and height of the image?

Q-20 the far point of a person suffering from myopia is 2 meters from the eye. Find the focal length and power of the corrective lens that will correct his vision.

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CBSE Science and Technology Class: X Assignments 2012

CBSE Science and Technology Class: X Assignments 2012

Chapter: CABBON and ITS COMPOUNDS

1.Write the molecular formula of ethanol.

2.An organic compound X having molecular formula C₂H₄O₂, gives brisk effervescence with sodium bicarbonate. Give the formula and the name of X.

3 The general formula of a homologous series of carbon compounds is C_nH_2n+1OH.Write the molecular formulae of fourth and fifth members of this series?

4.Illustrate the IUPAC system of nomenclature for the following compounds:

    (a).CH₃OH        (b).C₂H₈OH           (c ).C₃H₇OH.

5.What happens when a dry piece of sodium metal is added to ethyl alcohol?

Explain with equation.

6.What happens when ethyl alcohol is warmed with alkaline potassium permagnate?

7.What will be the formula and electron dot structure of Propyne?

8.Write chemical equation for saponification & esterification.

9.The molecular formula C₃H₆O can represent an aldehyde as well as a ketone.

Write their structure and name them.

10.Why should one condemn drinking of alcohol?

11.Define isomerism.

12.How is that we can use  detergents not soaps for washing clothes even when water is hard?

Assignment Subject: Class: X Chapter: Periodic Classification of Elements

1. How many elements were discovered at the time of Mendeleev?

1. Define Atomic radius and give its variation along group and period.

1. Three elements A, B and C having atomic radii 124pm, 456pm and 324pm respectively. Arrange them according to their position in group.

1. Which law was based on the notes of music?

1. State Modern periodic law.

1.  What was the main advantage of Mendleev’s periodic table?

1. What are metalloids? Explain about their position in Modern periodic table.

1. Why was it necessary to change the basis of classification from atomic weight to atomic number?

1. Two elements having atomic no.12 and 17 both belong to same period. State reason.

1. Explain how Modern periodic law was able to tell about the position of isotopes in periodic table, which cannot be explained by Mendeleev?

1. (a) State two defects of Modern periodic table.

1. What are the units of inheritance in living organisms? Where are they located?

1. Name the theory of evolution given by Charles Darwin & name the book in which it was given?                                              

1. Define Genetics. What was the contribution of Mendel in this branch of biology?

1. How do embryological studies provide evidence in favor of evolution?

1. How is artificial selection beneficial?

1. How analogous organs provide evidence in favor evolution?

1. Explain diagrammatically Mendels MONOHYBRID & DIHYBRID CROSS?

1. Humans have evolved in a tree like structure. Discuss.

1. A cross between round and wrinkled seeds produced round seeds. When these were selfed out 420 seeds 300 were round &102 were wrinkled.

1. A species give rise to new species with a complex body design. Will be better than the old species.

1. A ray of light incident normally on a mirror retraces its path. Why?

1. State mirror formula. Will focal length of mirror changes on changing the distance of the object? If not, why? What determines the focal length of the mirror?

1. What kind of lens is there in human eye? What enables the eye to focus objects at different distances?

1. Explain: a) Sun appears to rise 2 minutes before and sets 2 minutes later.What is meant by persistance of vision?

1. b) Sky appears blue.

1. c) Stars twinkle at night

1. What is meant by myopia and hypermetropia? How can the two be corrected? Explain with the help of diagram?
2. A person cannot see the object distinctly hen placed at a distance less than 100 cm. What is the power of spectacles that he should use to see clearly the objects placed at 25 cm?
3. A 14-year-old student is not able to see clearly the questions written on the blackboard placed at a distance of 5m from him (a) Name the defect of vision he is suffering from. (b) With the help of labeled ray diagrams show how this defect can be corrected (c) Name the type of lens used to correct the defect.
4. What is presbyopia? What causes presbyopia? How it can be corrected?

5. Why we are not able to see immediately after we enter a darkened hall?

(b) The atomic number of X, Y and Z are 9, 11 and 17.

i.) Which of them belong to the same group?

ii.) Which of them belong to the same period?

iii.) Which is bigger in size: X or Z and why?

12. (a) Give reason:

i). A chlorine atom is smaller than a sodium atom although atomic number of chlorine (11) is greater than sodium (17).

ii.) All elements of the same group have similar properties.

iii.) the noble gases are placed in separate group.

(b) An element X belongs to third period and group 16 of the periodic table.

i)    Write its electronic configuration and name.

ii)   What is the valency of X?

Class: X Chapter: HOW DO ORGANISMS REPRODUCE

1.What is the basic difference between asexual and sexual reproduction?

2.Which of the following organisms reproduce by asexual method? Amoeba, Cat, Birds, Hydra.

3Name one organism, each which reproduces by:

 a. Binary fission     b Spore formation        c. Budding      d. Fragmentation

4. Where are  male and female gametes formed in:

a. Human beings               b. flowering plants.

5. What is vegetative propagation? Give its two advantages.

6. Differentiate between unisexual and hermophrodite organisms.

7. Define fertilization. Where does fertilization take place in human body?

8. What are STD`s? Give 2 examples.

9. Draw labeled diagram of:  A) Human male reproduction system   b) Human female reproduction system 

10. What are male and female gonads in human beings?

11. What is pollination? Explain the 2 types of pollination.

12. Explain the structure of flower with the help of a labeled diagram.

13. Define the terms~

                a) Gestation period        b) Implantation     c) Placenta    

14. Describe the function of surgical method of birth control.

15. What is the full form of OCs? Which substances are contained in these? How do they work? 

Assignment Subject: Science and Technology Class: X Chapter: Heredity and Evolution

Assignment PHYSICS Class: X Chapter: : LIGHT: REFLECTION AND REFRACTION

3. A thin lens has a focal length of –25 cm. What is the power of the lens? Is it convex or concave?

4. A converging mirror form a real image of height 4 cm, of an object of height 1 cm placed 20 cm away from the mirror. Calculate the image distance. What is the focal length of the mirror?

5. An arrow 2.5 cm high is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Find the nature, position and size of the image formed.

6. A pond of depth 20 cm is filled with water of refractive index 4/3. Calculate apparent depth of the tank when viewed normally.

7.Calculate the distance at which an object should be placed in front of a thin convex lens of focal length 10 cm to obtain a virtual image of double its size.

8. A concave lens of focal length 25 cm and a convex lens of focal length 20 cm are placed in contact with each other. What is the power of this combination? Also calculate focal length of this combination

Assignment Subject: Science and Technology Class: X Chapter: Our Environment

1.Which of the following materials are biodegradable? Aluminium wire, Tea leaves, Synthetic fibre and wool.

2 Arrange the following in a food chain: Fish, Algae, Small animals and Big fish.

3.Define tropic level. Draw the food chain with four tropic level.

4.In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemical be maximum?

5.What is meant by bioconcentration of pestisides? Which common pestisides has accumulated in human body in considerable amounts?

6.If we use excess pestisides to protect the crops from diseases,then it may cause long term damage to mankind.Justify the statement.

7.What is the difference between food chain food web?Give suitable examples. Explain how harmful chemicals enter our bodies.

8.What is ozone and how does it affect any ecosystem?

9. Write a note on the flow of energy through different steps in the food chain.

10.Consider the food chain: Grass-Goat-Tiger.

If tiger has 30 J of energy available in this food chain, how much energy was originally available in grass?

11.What is 10%law? Explain with an example how energy flows through different tropic levels.

Assignment Subject:Class: X Chapter: Management of Natural Resources

1.Name the three R’s to save the environment. Explain each of them.

2.What is ‘Amrita Devi Bishnoi National Award’?

3.Explain the role of forests in conserving the environment. How do forests get depleted? What are its consequences?

4.What is Narmada Bachao Andolan?

5.What are the advantages of building dams?

6.How do you achieve sustainable development?

7.How is Khejari tree related to the preservation of biodiversity?

8.How do we find contamination of water?

9.How is conservation indifferent from preservation?

10.How does socio-cultural environment affect human beings?

11.Name any two wastes that can be recycled and reused.

12.How can you as an individual contribute or make a difference to the management of:

      (a) forests and wild life.            (b)water resources       (c)coal and petroleum?

class 10 MAGNETIC EFFECTS OF CURRENT(Assignment)

CBSE PHYSICS  TYPE  A MAGNETIC FIELD and  FIELD LINES

1. What effects do you expect on passing current through a conductor?
2. How it can be shown that a current carrying conductor produces a magnetic field?
3. Why compass always align itself in approximately north–south direction?
4. Why some substances exhibit magnetism naturally, while others don’t?
5. What do you mean by ‘magnetic field lines’?
6. List the characteristics of magnetic field lines?
7. How magnetic field lines are drawn?
8. How one can represent a region of uniform magnetic field using magnetic field lines?
9. Why two magnetic field lines never cross each other?
10. What is the direction of magnetic field line?
11. What is necessary to have a magnetic field?
12. What do you mean by magnetic field?
13. If equal number of electrons and proton travels in same direction, will there be any magnetic field
produced?
14. Is it possible that magnetic field line emerging out of north pole of one bar magnet can enter the south pole of another bar magnet?
15. Can magnetic field lines of two different bar magnets cross each other on bringing the bar magnets closer?
16. Consider that there is a long queue of electrons at rest. Will you experience any magnetic field moving along this queue of electrons?
17. Can we separate north pole and south pole of a magnet?
18. What will happen if we break a bar magnet into two equal halves?

19. Magnetic fields in two different regions described by magnetic field lines as shown below.

What conclusion one can draw about the magnetic fields in region 1 and 2?

20. Detect the north pole of the bar magnet, show below?

TYPE B MAGNETIC FIELD DUE TO CURRENT CARRYING CONDUCTOR

1. Show the magnetic field pattern produced due to a straight current carrying conductor.
2. Which rule can help us to find the direction of magnetic field lines around a straight current carrying conductor?
3. What factors influence the magnetic field around a current carrying conductor?
4. What is a solenoid? How will you increase the magnetic field strength due to solenoid?
5. Show the magnetic field pattern produced due to current carrying circular loop and solenoid.
6. What is an electromagnet?
7. What is the difference between the magnetic field pattern of a solenoid and a bar magnet?
8. What you can say about magnetic field inside a solenoid?
9. When we can use right hand thumb rule?
10. Magnetic field at the center of a current carrying loop (in the plane of paper) is directed in the outward direction. What will be the direction of the current flow?
11. What are electromagnets? Discuss their advantages over natural magnets.
12. A current is flowing vertically upward in a wire. What will be direction of field lines if
(a) wire is in front of you? (b) wire is at your backside?
13. In the figure given below, find the direction of the current in the wire.

14. Can we change the pattern of magnetic field around a current carrying conductor? If yes then how?
15. What will happen to magnetic field strength of a current carrying solenoid if we increase the number of loops?
16. Can magnetic field line be parallel to the direction of current flow?
17. Where is the region of uniform magnetic field due to a current carrying solenoid?
18. Can there be a magnetic field without flow of charge (current)?

TYPE C MAGNETIC FORCE AND ELECTRIC MOTOR

1. On what factors, does the force experienced by a current carrying conductor placed inside a magnetic field, depends?
2. How one can show experimentally that force on a current carrying conductor depends upon the
(a) direction of the magnetic field? (b) direction of the flow of current?
3. Why is current carrying conductor experiences a force on placing it, inside a magnetic field?
4. When the force experienced by a straight current carrying conductor will be maximum?
5. How one can determine the direction of force on a straight current carrying conductor placed inside a magnetic field?
6. Can the magnetic force, on a charge moving in magnetic field, accelerate the charge linearly?
7. In which direction, does the electron beam moving along the earth’s equator (from west to east) will experience the force due to the earth’s magnetic field?
8. State the principle on which an electric motor works.
9. Name the device which converts electrical energy into mechanical energy?
9. Explain the working of an electric motor with the help of a labeled diagram.
10. What is the function of split rings in an electric motor?
11. How rotation of electric motor armature will be affected on (i) interchanging the magnetic poles (ii) reversing battery polarity (iii) both (i) and (ii) simultaneously?
12. Can direction of flow of current, direction of magnetic field and magnetic force on that current carrying conductor lie in same plane?

13. A bar magnet is placed inside a uniform magnetic field as shown below.

14. What type of motion do you expect from the bar magnet?
15. What will happen if we change the split ring by two different complete rings in an electric motor?
16. What will happen if we use circular coil instead of rectangular coil in armature of an electric generator?
17. Can we differentiate magnetic field lines formed due to a bar magnet and a current carrying solenoid using a compass?
18. If a current carrying conductor experiences a force (action) on placing it in a magnetic field then which component experiences its reaction as per the Newton’s third law?
19. If we halve the number of turns in a current carrying solenoid without changing anything else, what will be the difference in force experienced on placing it in a magnetic field from the previous case?
20. What will happen to the rotation of armature if we:–
(a) increase the number of rectangular turns? (b) increase the magnetic pole strength?
(c) decrease the current through armature coil?

TYPE_ D ELECTROMAGNETIC INDUCTION AND ELECTRIC GENERATOR

1. Explain the working of a galvanometer?
2. What is electromagnetic induction? Design an experiment to describe this phenomenon.
3. By how many different means one can induce current in a conductor?
4. What do you mean by A.C. (Alternating Current)?
5. State the principle on which electric generator works.
6. Explain the working of an electric generator using a labeled diagram.
7. If a bar magnet is moving with a constant speed with respect to a solenoid connected to a galvanometer. What do you expect to observe?
8. What is the difference between an A.C. and a D.C. electric generator?
9. How and by whom electromagnetic induction was discovered?
10. State Fleming’s right hand rule. Name a device which works on this principle.
11. Why electromagnetic induction is termed so?
12. What is necessary to induce a current in a conductor?
13. What will happen to the output current of a D.C. generator if we:–
(a) increase the number of turns in armature coil?
(b) increase the magnetic pole strength?
(c) decrease the speed of rotation of armature coil?
(d) replace the split rings with two different complete rings attached to either end of armature coil?
14. Draw a labeled diagram showing rotational motion of a rectangular coil inside a magnetic field and
direction of induced current.
15. How one can show experimentally that electricity and magnetism are linked?
16. A solenoid is placed in the neighborhood of a strong electromagnet. Will there be any induced current?

TYPE_ E DOMESTIC ELECTRICAL CIRCUITS

1. What type of load combination (parallel or series) is usually followed in domestic electrical circuits and why?
2. Why earthing is done in an electrical circuit?
3. Briefly discuss the power distribution to a household circuitry.
4. What is the function of a fuse in an electrical circuit? What special characteristics should it possesses?
5. List the advantages of using fuse in an electrical circuit.
6. What colour scheme is generally used for the power wires?
7. What are the general specifications of electrical power we receive from the electricity board?
8. What is the difference between direct current and alternating current?
9. What do you mean by overloading of an electric circuit?
10. What precautions one should take to avoid overloading?
11. How fuse prevents damage during overloading or a short circuit?
12. What happens during a short circuit?
13. Can overloading in parallel combination can be taken equivalent to a short circuit?

CLASS X Important Questions Bank Magnetic effects of electric current

One mark Questions:
Part 1
1. How can you show that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire decreases? 

2. What is the advantage of the third wire of earth connection in domestic appliances? 

3. What constitutes the field of a magnet?
4. What is short-circuiting in an electric supply?
5. What will be the frequency of an alternating current if its direction changes after every 0.01s?
 6. An alternating electric current has a frequency of 50 Hz. How many times does it change its direction in 1s?
7. How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire?
8. How can it be shown that a magnetic field exists around a wire through which a direct current is passing?
9. On what effect of an electric current does an electromagnet work? 

10. What is the direction of magnetic field at the centre of a circular coil carrying current in anticlockwise direction?
Part -2
(Q.1) Passage of current through a straight conductor display some fixed pattern. Pick out the odd one ( 1 mark )
(a) Magnitude of the magnetic field produced at a given point increases as the current through wire increases
(b) The magnetic field produced by a given current in the conductor increases as the distance from it decreases
(c) Direction of the field lines is in accordance with the right hand thumb rule
(d) Field lines are unaffected by the quantity of current flowing.
(Q.2) The phenomenon of electro-magnetic induction is ( 1 mark )
(a) The process of generating magnetic field due to a current passing through a coil.

(b) Producing induced current in a coil due to relative motion between the magnet and the coil.
(c) The process of rotating a coil.  

(d) The process of charging a body. 

(Q.3) A magnetic field cannot exert any force on a( 1 mark )
(a) Moving magnet     (b) Stationary magnet      (c) Stationary charge(d) Moving charge
 (Q.4) Degree of closeness of the magnetic field lines signifies:( 1 mark )
 (a) Number of magnetic fields                                   (b) Distance between different magnetic fields
 (c) Relative strength of the magnetic field                (d) Direction of the magnetic field
(Q.5) What is a magnet? ( 1 mark )
(Q.6) What is the SI unit of induced current? ( 1 mark )
(Q.7) What is the frequency of d.c current? ( 1 mark )
(Q.8) What is the frequency of a.c current that you use in your house? ( 1 mark )
(Q.9) What is magnetic field? ( 1 mark )
(Q.10) There is a battery operated toy, what kind of motor is being used in it? ( 1 mark )
(Q.11) Give two example of devices in which d.c motor is used. ( 1 mark )
(Q.12) Give two examples in which a.c motor is used. ( 1 mark )
(Q.13) What is generator? ( 1 mark )
(Q.14) What is motor? ( 1 mark )
(Q.15) When the current in a wire moves from south to north, the direction of the deflection in the magnetic needle parallel to the wire will be:( 1 mark )
(a) East to west            (b) West to east         (c) East to north              (d) West to south
(Q.16) Magnetic field is a quantity that has both direction and magnitude. Pick out the incorrect statement( 1 mark )
(a) The magnetic field lines emerge from north pole and merge at the south pole.
(b) Inside the magnet, the direction of field lines is from its south pole to its north pole.
(c) Inside the magnet, the direction of field lines is from its north pole to its south pole.
(d) No two field lines intersect each other and the field is strongest where the field lines are crowded.
(Q.17) The region surrounding a magnet, in which the force of the magnet can be detected is said to have( 1 mark )
(a) Magnetic field          (b) Electric field            (c) Magnetic poles           (d) Electric poles
(Q.18) Which of the following is not the special features of magnets? ( 1 mark )
(a) They align in the North –South direction when suspended freely.
(b) They have two distinct North and South poles.

(c) Like poles attract each other and unlike poles repel each other.
(d) The magnetic field lines produced due to a magnet are closed curves.
(Q.19) Direction of the force experienced by a current-carrying conductor when placed in a magnetic field is dependent on ( 1 mark )
(a) Direction of the current alone            

(b) Direction of the magnetic field alone
(c) Direction of current as well as the direction of magnetic field
(d) Direction of electric field
(Q.20) The magnitude of the force experienced by a current-carrying conductor when placed in a magnetic field will be( 1 mark )
(a) Maximum if the directions of current and magnetic field are perpendicular to each other
 (b) Minimum if the directions of current and magnetic field are perpendicular to each other
 (c) Maximum if the directions of current and magnetic field are opposite to each other (d) Maximum if the directions of current and magnetic field are same
(Q.21) Which of the following is not true for an electric generator( 1 mark )
(a) Converts mechanical energy into electrical energy.
(b) Works on the basis of electromagnetic induction.
(c) Can be used to generate AC or DC.
(d) Converts electrical energy to mechanical energy
(Q.22) An alpha particle is projected towards west and gets deflected towards north by a magnetic field. The direction of the magnetic field is ( 1 mark ) 

(a) Towards south                   (b) Towards east             (c) Downwards            (d) Upwards
(Q.23) An electric current through a metallic conductor produces a/an _________ around it. ( 1 mark )
(a) Electric field          (b) Magnetic field            (c) Electromagnetic effect. (d) Gravitational field
(Q.24) A straight conducting wire is placed parallel to and over a compass needle. The deflection in the needle ( 1 mark )
(a) Becomes opposite when the direction of the current is reversed

(b) Remains in the same direction even on reversing the direction of current

(c) Keeps fluctuating on passage of current in any direction
(d) Is negligible on reversing the direction of current
(Q.25) At every point of a current carrying circular loop, the concentric circles representing the magnetic fields around it would become( 1 mark )
(a) Larger and larger as we move away from the wire.
(b) So large at the centre of circular loop that they look like straight lines.
(c) Smaller and smaller as we go away from the wire.
(d) There is no fixed pattern for circles
(Q.26) Which of the following statements is not true?( 1 mark )
(a) The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor.

(b) The magnetic field of a solenoid carrying a current is similar to that of a bar magnet.
(c) Magnitude of magnetic field is directly proportional to the quantity of current flowing through the current.
(d) Magnetic field produced by the passage of current through a straight wire is permanent.
(Q.27) Magnetic field produced inside a solenoid are so strong that ( 1 mark )
(a) They can be used to magnetize a magnetic material, when placed inside the coil.
(b) They can be used to magnetize a magnetic material, when placed near the coil.
(c) They are still not able to magnetize a magnetic material. (d) They become permanent.
(Q.28) Increase in number of turns of a coil in the solenoid will( 1 mark )
(a) Have no effect on the strength of magnetic field   (b) Will add to the strength of the magnetic field
 (c) Will decrease the strength of the magnetic field    (d) Will change the direction of the magnetic field
(Q.29) An electromagnet consists of a core of ___________ wrapped around with a coil of ________ copper wire.( 1 mark )
(a) Soft iron, insulated     (b) Aluminum, Insulated     (c) Soft iron, uncovered (d) Magnet, uncovered
(Q.30) A current-carrying conductor when placed in a magnetic field experiences ( 1 mark ) 

(a) An acceleration   (b) A force          (c) Demagnetization    (d) It always remains in equilibrium
(Q.31) An electric motor is a device( 1 mark )
(a) That converts electrical energy into kinetic energy
(b) That converts electrical energy to mechanical energy
(c) There is no energy conversion of one form to another.
(d) That converts sound energy to light energy.
(Q.32) Which of the following statements cannot be related to the construction of an electric motor? ( 1 mark )
(a) A rectangular coil of insulated copper wire is placed between the two poles of a magnetic field such that two of its parallel sides are perpendicular to the direction of the magnetic field.
(b) The ends of the coil are connected to the two halves of a split ring.
(c) The inner insulated sides are attached to axle whereas the external conducting edges touch two conducting stationary brushes.

(d) The coil and the axle continuously rotate in one direction.
(Q.33) The direction of the induced current is given by( 1 mark )
(a) Right Hand Thumb Rule
 (b) Fleming’s Left Hand Rule
(c) Fleming’s Right hand Rule
(d) Faraday's law
(Q.34) According to Fleming’s Right Hand Rule, if we stretch the thumb, forefinger and middle finger of right hand – forefinger indicates direction of magnetic field, thumb shows the direction of motion of conductor, and then the middle finger will show the direction of ( 1 mark )
(a) Induced current        (b) Magnetic Force    (c) Alternating Current   (d) Electric force
(Q.35) The induced current is highest when ( 1 mark )
(a) Direction of motion of coil is at 900 to the magnetic field.
(b) Direction of motion of coil is at 300 to the magnetic field.
(c) Direction of motion of coil is at 600 to the magnetic field.
(d) Direction of motion of coil is at 1800 to the magnetic field.
(Q.36) Parameters of electricity supply in India are ( 1 mark )
(a) Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A
(b) Potential Difference of 150 V, Frequency of 40 hertz and Current Rating of 10 A
(c) Potential Difference of 220 V, Frequency of 60 hertz and Current Rating of 15A
(d) Potential Difference of 220 V, Frequency of 40 hertz and Current Rating of 5 A
(Q.37) Pick the incorrect statement regarding fuse. Fuse is used for protecting the circuits due to ( 1 mark )
(a) Short-circuiting   (b) Overloading of circuits   (c) Faulty connections  (d) Theft
(Q.38) Which of the following will not cause overloading? ( 1 mark )
(a) Accidental hike in the supply voltage  b) Connecting many appliances to a single socket
 (c) Melting of fuse     (d) Short circuiting
Two marks Questions: 1. With the help of a neat-diagram, describe how you can generate induced current in a circuit.
2. What is meant by the term “Magnetic field Lines”? List two properties of magnetic field lines.
3. Write the rule which determines the direction of magnetic field developed around a straight
conductor when current is passed through the conductor.
4. State the rule to determine the direction of magnetic field produced around a current carrying
conductor.
5. On which factors does the force experienced by a current carrying conductor placed in a uniform
magnetic field depend?
6. State Fleming’s right-hand Rule.
7. Why is series arrangement not used for domestic circuits?
8. Differentiate between electric force and magnetic forces.
9. How does AC differ from DC? What are the advantages and disadvantages of AC over DC?
10. Draw the magnetic field due to a current carrying circular coil. State the clock rule to find the
polarities of the faces of the coil.
11. What will be the frequency of an alternating current, if its direction changes after every 0.05 sec?
12.What is the principle on which working of electric generator is based? What are its important part?.
13.Why two magnetic lines of forces don’t intersect each other?
14. Give two methods with which we can increase the strength of magnetic field produced by a circular coil carrying current?
Three Mark Questions 

1. Draw the pattern of field lined due to a solenoid carrying electric current. Mark the north and the south poles in the diagram.
2. Draw the pattern of lines of force due to a magnetic field through and around a current carrying loop of wire. How would the strength of the magnetic field produced at the centre of the circular loop be affected if 

(i) the strength of the current passing through this loop is doubled? 

(ii) the radius of the loop  is reduced to half of the original radius?
3. Draw the pattern lines of force due to a magnetic field associated with a current carrying conductor. State how the magnetic field produced changes 

(i) with an increase in current in the conductor and

(ii) the distance from the conductor.
4. Draw the pattern of field lines due to a bar magnet. Mention any two properties of the magnetic field  lines. 

5. How does the strength of the magnetic field at the centre of a circular coil of wire depend on:

 (i) the radius of the coil? 

(ii) the number of turns of the wire? 

(iii) the strength of the current flowing in the coil?
6. The flow of a current in a circular loop of a wire creates a magnetic field at its centre. How can
existence of the field be detected? State the rule which helps to predict the direction of this magnetic
field.
7. What are the factors on which the strength of magnetic field produced by current-carrying solenoid
depends?
8. A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is: 

(i) pushed into the coil with north pole entering first 

(ii) pulled out of the coil 

(iii) held stationary inside the coil?
9. Explain what is short-circuiting and overloading in an electric supply.
10. What are magnetic field lines? How is the direction of a magnetic field at a point determined?
11.What are the factors which govern the force experienced by a current carrying conductor placed in a uniform magnetic field depends? ( 3 Marks )
12. Distinguish between an electric motor and generator?
13.What is direct current (d.c) and alternating current (a.c).
14.A current of 2 A flows through a circular coil of radius of 4 cm, and has 10 turns. The coil is
aligned horizontally and current flows though the coil in clockwise direction. Find the magnitude and
direction of magnetic field at the centre of the coil due to the current.
Five Mark Questions:
1. (a) Suggest an activity to show the pattern of magnetic field lines, when you are provided with a bar magnet, a cardboard piece and iron filings

(b)Draw a rough sketch of the field lines which you will observe.
2. (a) What is an electromagnet? What does it consists of? 

(b) Name one material in each case used to make a

 (i) permanent magnet (ii) temporary magnet. 

(c) Describe an activity to show how can you make an electromagnet in your school lab?
3. State Fleming’s left-hand rule. With a labeled diagram, describe the working of an electric motor. What is the function of split-ring Commutator in a motor?
4. State Fleming’s right-hand rule. With a labeled diagram, describe the working of an AC electric generator.
5. Draw the lines of force of the magnetic field through and around (a)single loop of wire carrying current, (b) a solenoid carrying electric current.
6. Why is pure iron not used for making permanent magnets? Name one material used for making permanent magnets. Describe how permanent magnets are made electrically. State two examples of electrical appliances made by using permanent magnets.
7. (a)Draw a schematic labeled diagram of a domestic wiring circuit which includes (i)a main fuse (ii) a power meter (iii)one light point (iv) a power plug.(b) Why is it necessary to connect an earth wire to electric appliances having metallic covers?
8. (a)What are magnetic field lines? How is the direction of a magnetic field at a point determined? (b) Draw two field lines around a bar magnet along its length on its two sides and mark the field directions on them by arrow marks. (c) List any three properties of magnetic field lines.
9. What is an electric motor? With the help of a diagram, describe the working of an electric motor.
10. What are magnetic field lines? Write their characteristics. Draw the magnetic field lines due to a current flowing in a circular coil.
11. Explain the principle, construction and working of an electric motor.
12. Explain with labeled diagram, the principle, construction and working of an electric generator.
13. (a ). What is an electromagnet ?    (b). List any of its two uses.
(c ). Draw a labeled diagram to show how an electromagnet is made.
(d ). What is the purpose of the soft iron core used in making an electromagnet ?
14.A solenoid is 1 m long and 2 cm in diameter has 50 turns/cm. A current of 5 A is flowing through it. Calculate the magnetic induction:    a) Inside the solenoid.   b) At one end on the axis of solenoid.
15. Explain the construction and working of electric motor?
16. What is the principle behind the working of electric generator? Explain its working with the help of well labeled diagram.
17. The mains power supply of a house is through a 5-A fuse. How many 100-W bulbs can be used in this house at the correct voltage?
18. A wire 10 cm long and carrying a current of 1.5 A is held in a uniform magnetic field in which B=10-3 T. Calculate the force on the wire if it is held perpendicular to the lines of the magnetic field.
19 A current of 10 A flows in a circular coil of 1000 turns and radius 0.1 m. Find the magnitude of the magnetic field at the centre of the coil.
20. At what distance from a straight conductor carrying a current of 2.8 A, will the magnetic induction be 2.8×10-5 T?
21. Find the strength of the current which will produce a magnetic field of 10-4 T at the centre of a coil of mean radius 0.10 m. The coil comprises 20 turns.
22. A 0.4 m wire, stretched horizontally, carries an electric current of 15 A from East to West, in a magnetic field whose magnetic field intensity is 0.1 N/Am, directed vertically downwards. What is (a) the magnitude of the magnetic deflecting force on the wire, and (b) its direction?