CBSE PHYSICS: 10th FORMATIVE ASSESSMENT

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04 February 2012

X Optics Numerical Problems from CBSE Board Paper

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.

X (10) CBSE Sure Shoot Guess Question paper 2013-2014

22 September 2011

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?

20 September 2011

CBSE FORMATIVE ASSESSMENT chapter Energy class 10

ENERGY

FORMATIVE ASSESSMENT I

Q.PAPER I

MARKS-30 TIME- 70 MINUTES

Instructions:

Questions : 1 to 5 – 1 Mark each

Questions : 6 to 9 – 2 Marks each

Questions : 10 to 13 – 3 Marks each

Question 14 – 5 Marks

1. Which component of sunlight helps in drying of cloths?

2. In what form energy stored in water in high raised dams?

3. Name two places of our country where nuclear power plants are located.

4. What is a solar cell?

10th science physics Formative Assessment MAGNETIC EFFECTS OF ELECTRIC CURRENT

Q. PAPER II MARKS-30 TIME- 70 MINUTES

Instructions:

Questions : 1 to 5 – 1 Mark each Questions : 6 to 9 – 2 Marks each

Questions : 10 to 13 – 3 Marks each Question 14 – 5 Marks

1. State two uses of electromagnet.

2. An electron moving along X – axis in a magnetic field along Y – axis. In which direction will the electron deflected.

3. State Fleming’s left hand rule.

4. What is the importance of earth wire?

5. Should a copper wire be used as a fuse wire? If not, why?

6. Give two points of difference between and electromagnet and permanent magnet.

7. Draw the lines of force indicating field direction of the magnetic field through and around

i) Single loop of wire carrying electric current. ii) A solenoid carrying electric current.

8. What id magnetic field? How is the direction of magnetic field at a point determined?

9. Give four features of domestic electric wiring.

10. Draw a schematic diagram of domestic wiring system and write its main features.

11. Match the following:

A B

i) Right hand thumb rule a) Force on a conductor in a magnetic field

ii) Fleming’s left hand rule b) Direction of magnetic field of straight conductor

iii) Fleming’s right hand rule c) Direction of induced current in conductor

d) Polarity of any end of a solenoid.

12. a) Draw a labelled diagram to show how electro – magnet is made.

b) What is the purpose of soft iron core in making electromagnet?

13. Write two differences between AC and DC current and draw diagram also.

14. a) Write principle of electric generator.

b) Explain construction and working of generator.

c) Draw labelled diagram of electric generator.
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10th science physics ELECTRICITY FORMATIVE ASSESSMENT

ELECTRICITY FORMATIVE ASSESSMENT

Q. PAPER I MARKS-30 TIME- 70 MINUTES

Instructions: Questions : 1 to 5 – 1 Mark each Questions : 6 to 9 – 2 Marks each

Questions : 10 to 13 – 3 Marks each Question 14 – 5 Marks

1. Define resistivity of material.

2. What is the power of torch bulb rated at 2.5V and 500mA?

3. Why series arrangement not used for connecting domestic electrical appliances in a circuit?

4. Which has higher resistance – a 50W bulb or a 2.5W bulb and how many times?

5. What is the direction of flow of conventional current?

6. Why is it not advisable to handle electrical appliances with wet hands?

7. Two electric bulbs marked 100W 220V and 200W 200V have tungsten filament of same length. Which of the two bulbs will have thicker filament?

8. How does the resistance of a wire vary with its area of cross section?

9. D raw the following symbols

(i) Battery (ii) Switch closed (iii) Resistor of resistance R (iv) Voltmeter

10A. geyser is rated 1500W, 250V. This geyser is connected to 250V mains. Calculate –

i. The current drawn ii. The energy consumed in 50hrs.

iii. The cost of energy consumed at Rs. 2.20 per kWh.

11W. hat is the function of an electric fuse? Name the material used for making fuse. In household circuit where is fuse connected?

12 Write one important advantage of using alternative current. How alternating current differ from direct current?

13What is the difference between short circuiting and overloading?

a. ) Draw diagram showing three resistors R1, R2 and R3 in series.

b) Two resistors of resistance 4W and 12W

i) In parallel ii) In series Calculate the values of effective resistance in each case.

FORMATIVE ASSESSMENT I Q. PAPER II

1. Name the instrument used to measure electric current.

2. What is the mathematical form of Ohm’s law?

3. Name a metal which is the best conductor electricity.

4. Why resistance become more in series combination?

5. What is electrical power? Write its unit.

6. Why does resistance of a conductor increase with increase in temperature?

7. Current in a circuit is doubles by changing resistance. What will be the change in power loss?

8. Why are the conductors of electric heating devices such as bread toaster and electric iron made of alloy rather than pure metal?

9. Draw the following symbols

i) Electric cell ii) Switch open iii) Electric bulb iv) Ammeter

10. A 100 watt electric bulb is lighted for 2 hours daily and four 40 watt bulbs are lighted for 4 hours daily. Calculate the energy consumed (in kWh) in 30 days.

11. Resistance of a conductor depends on which three factors. Explain with mathematical expression.

12. What is the effect of temperature on resistance of – pure metals, insulators and semi – conductors.

13. Write 3 points of difference between direct and alternate current.

14. a) Draw diagram showing three resistors R1, R2 and R3 in parallel.

b) Two identical resistors, each of resistance 2 ohms, are connected in turn

CBSE PHYSICS

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