Stars and The Solar System Oral questions CCE FA Test 8th class

8th (VIII) Stars and The Solar System (Physics)

Oral questions for Formative and Summative Assessments

Q.1.Name the planet appears I the northern sky before sun rise?

Ans: Venus brightest of all planets

Q.2. Name the planet which has 28 moons?

Ans: Jupiter manly consist of hydrogen and helium gases

Q.3. In which direction stars move except Polar star?

Ans: When seen from earth stars appears to move from east to west.

Q.4. Why pole star appears stationary?

Ans: As it lies on the imaginary axis of the rotation of the earth.

Q.5.Which two planets have asteroids between them?

Ans: asteroids are the rocks pieces that revolve around the sun between the orbit of Mars and Jupiter.

Q.6. Which comet visit the earth after 76 year?

Ans: Halley’s comet. Heavenly bodies that revolve around the sun and appears as bright as glowing ball with a long tail is called comet.

Q.7.What happen to meteors when enters the earth’s atmosphere?

Ans: meteors when enters the earth’s atmosphere starts glowing and are seen as a bright steak of light fleshing momentarily across the sky.

Q.8.What is the high tog geostationary satellite from the earth surface?

Ans: 36000km and used for satellite communicacation.

Q.9. What does term INSAT mean?

Ans: Indian National Satellite.

Q.10.Name the first Indian satellite launched success fully.

Ans : Aryabhata on 19 april,1975

Q.11. Some stars are bright and some are dim; some stars look white while some may look blue and some red. why?

Answer: Stars differ in apparent brightness for two reasons; one is that they are at different distances and the other is that they differ in their intrinsic (actual) brightness

Fill in the blanks

1. The distance of the sun from the earth is nearly ----------

Answer: 1.5 x 108 km

2. Light takes about  ----------- to travel from the sun to the earth

Answer: 8 minutes

3. The sun rotates from west to east with a period of about  ---------

26 days

4.The visible disc of the sun is called  ------------

Answer: photosphere

5. The layer just above the photosphere is called the --------------

Answer: chromosphere

6. The region beyond  chromospheres  is called  -------------

Answer: corona

7. The total energy emitted by a star in one second is called its  ----------

Answer: luminosity

8.  -------------- is the study of the universe. It deals especially with the search for suitable theories to understand the observed universe, its origin and its future.

Answer: Cosmology Stars and The Solar System Stars and The Solar System Oral questions CCE FA Test Read /View/Download CBSE Ch. Stars and The Solar System (Physics) MCQ Read /View/Download Choose the Appropriate Answer MCQ Read /View/Download Test Paper Based on CCE (With Solution) Read /View/Download Questions Paper for SA with solution Read /View/Download Stars and The Solar System- Question bank Class VIII(8th) Read /View/Download

Class 6th Fun with magnet CBSE /NCERT Questions with answer

CBSE NCERT Class VI Science Lesson 13:Lesson 13: Fun with Magnets.

1. Who discover magnet?

Ans: A Greek shepherd named Magnes discovered magnets 4,000 years ago in Magnesia, Greece. The name magnetite has been derived from Magnesia or Magnes.

2. What is magnet?

Ans: Any material that attract iron object is called magnet. The two ends of a magnet are called its poles. The poles of a magnet are named as the North Pole and the South Pole. In order to identify the poles, the North Pole is usually painted in red colour. All magnets have two poles, and they are called dipoles.  Law of magnets :Unlike poles attract each other and like poles repel each other.

3. Why magnet called load stone?

Ans: Magnet in the form of a bar was used to find directions on the earth, and so it is called as a Lodestone.

4. What are magnetic material and Non-Magnetic Materials?

Ans: Materials that are attracted by a magnet are called magnetic materials. Objects made of materials such as iron, cobalt and nickel are magnetic objects. Examples of magnetic materials include iron nail, key, metal spade, needle and metal door handle.

Materials that are not attracted by magnets are called non-magnetic materials. Examples of non-magnetic materials include rubber, coins, feather and leather.

5. What are different types of magnets?

Ans: Bar magnets : In these magnets, the poles are located at the ends of the bar.

Cylindrical magnets:  In these magnets, the poles are located at the two circular ends of the cylinder.

Horseshoe magnets : In these magnets, the poles are located at the two free ends of the 'U' shape.

6. What is Compass?

Ans: A compass is an instrument that is used to find the directions. It has a thin magnetic needle supported from a pivot so that it can rotate freely. The needle is placed over a dial with the directions marked. The entire assembly is placed inside an airtight box.

7. How can you make artificial magnets?

Ans: A rectangular iron bar, an iron needle, a blade or an iron nail can be turned into a magnet by rubbing a bar magnet over like combing hair to make artificial magnets.

8. How do you protect magnets from losing their magnetic properties?

Ans: Precautions to protect magnets from losing their magnetic properties are:

(a) Never drop magnets from heights. (b) Never heat a magnet. (c) Do not hammer a magnet.

9. Write some use of magnet?

Ans: debit cards, credit cards or ATM cards, audio and video cassettes etc

10. What are magnetic keepers?

Ans: A soft iron pieces placed across the ends of a pairs of bar magnets to preserve the magnetism for a long time is called magnetic keepers.

Class VI Physics: Chapter: Electrical circuit

Quest Time CBSE NCERT VI Chapter: Electric currents, Circuits, Cell.

1. From where do we get electricity?

Ans: A power station provides electricity. If the supply of electricity may fail we use other sources of energy like torch at home.

2. Why does the bulb glow switch on a torch?

Ans: It glows because the electric energy stored in the electric cells is converted into light energy by the bulb.

Hence Electric cell is a source of light energy.

3. Name the scientist who developed first Cell?

Ans: The first electric cell was developed by an Italian scientist Luigi Galvani and then improved by Alessandro Volta.

4. Name a cell that is recharged by Light of The Sun?

Ans: alkali cells and solar cells. Solar cells convert light energy into electric energy.

5. What is an electric cell?

Ans: An electric cell is a device which converts chemical energy into electric energy.

The cell has two different metal plates – one is the positive terminal and the other is the negative terminal. These plates are kept inside a chemical called electrolyte. One of the chemical is white in color NH₄Cl (Ammonium chloride) and other is a black powder MnO₂ (manganese dioxide).

6. What is an electric current?

Ans: Electric current is the flow of electrons or charge. The cell is a source of electric current.

7. What is an electric circuit?

Ans: An electric circuit is the closed path along which electric current flows from the positive terminal to the negative terminal of the battery.

A circuit generally has:

a) A source of electric current - a cell or battery(A group of cell called battery)

b) Connecting wires for carrying current.

c) A device which uses the electricity - a bulb ( Bulb is a device that convert electrical energy into light)

d) A key or a switch – A component of circuits that stop or allow the flow of current. When the current flows the circuit is said to be closed circuit.  When the current does not flow, the circuit is said to be open circuit.

8. How does a bulb glow and produce light?

Ans: Inside the bulb there is a thin coil of wire made of tungsten, called filament. It gets heated and glows when the current flows. Hence, electric energy is converted into light energy by a bulb.

9. If the filament inside the bulb is broken will the bulb glow? Why?

Ans: The circuit is not complete; current does not flow through the circuit and the bulb does not glow.

10. Why do we feel warm when we touch the lighted bulb?

Ans: The bulb also emits heat energy along with light.

CBSE Class 6th Light Shadow and Reflections

LIGHT , SHADOWS AND REFLECTIONS Hots Questions

1. In a completely dark room, can you see your face in a mirror? Why?

Ans: Due to absence of light In a dark room. Light is the source that illuminates our face by reflection.

2. Why cannot we see upside down image of the sun?

Ans: Object like sun is in infinity whose image form point sized or highly demised.

3. Why shadows are black in colour?

Ans: It is because no light reaches on screen in area where shadow form. The colour of object is colour components of light that reflect and reach our eyes.

4. Can you see an object through a “T” shaper pipe? If, no, Why?

Ans: No, it is because light always travel in straight path that is known as rectilinear properties of light.

5. Can you see a reflected light directly? If, no Why?

Ans No, the path of the ray of light is itself invisible but make the things visible only when fall on our eyes.

6. What is the reason for the formation of shadow?

Ans: The rectilinear propagation of light .Kinds of shadow depends on the source f light.

(a)Point source of light form only dark and sharp shadow called the Umbra

(b)Extended source of light (smaller than object) form two reason a dark umbra and another less dark region called penumbra.

(c)Extended source of light (larger than object) : The size of umbra decreases and penumbra increases as screen move away from object and vice versa.

7. How can you see the thing around yourself?

Ans: We see the thing around us when light from a luminous object (like the

Sun, a torch or an electric light) falls on these objects and then travels towards our eye after refection. 

Read full post by clinking link given below

CBSE ADDA: CBSE Class 6th Light Shadow and Reflections:
Answer the following in one word 1. Light is form of what? Ans: Energy 2.What is the speed of light? Ans: 3 x10 8 m/s 3. Name t...
Brain Teaser Quest Time For Class 6th Light, Shadows  View/Download
Further study for Lesson 11: Light, Shadows And Reflections.
Solution for Questions in brief
View/Download
Hots questions with solution by Physics adda
View/Download 
Quest Time solved question by CBSE ADDA 

View/Download
6th Chapter Light CBSE Test paper-1
View/Download File 
6th Chapter Light CBSE Test paper-2
View/Download File

VI(6th)Science:Motion and Measurement of Distances : NCERT/CBSE

Answer the following question in brief

1. Give two example of periodic motion?

Ans: Motion of swing, Motion of pendulum, Motion of the earth around the sun

2. Shamvavi height is is 1.75m .Expess in cm and mm?

Ans: Shamvavi height is is 1.75m =1.75x100cm=175cm =175x10mm=1750mm

3. The length of table is 4270mm.Express in cm and m

Ans:  10mm =1cm Þ4270 m m = 4270/10=427cm

100cm = 1m     Þ427cm =427/100m =0.427m

4. Why does foot step not used in standard unit of length?

Ans: it is because  foot step vary from person to person

5. While measuring the length of paper clip, the reading of the scale at one end is 1.0 cm and on the other end is 4.7 cm. What is the length of paper clip?

Ans: The length of the needle = (4.7- 1.0) cm = 3.7 cm

6. The distance between main gate of red fort and india gate is 4279m .Express in km?

Ans: 1000m = 1km Þ4279/1000 km=4.279km

7. Arrange the following length in increasing order ; 1km;1mm;1cm;1m

Ans: length in increasing order 1mm < 1cm < 1m < km

8. Roll a ball on ground. Identify the types of motion?

Ans: A rolling ball moves in straight line on ground is combination of Rectilinear and rotatory motion.

9. Classify the following into different types of motion:

a) The motion of man on a straight road.  b) The motion of wheels of a car .

c) The motion of a falling stone.

Ans: a) rectilinear motion.  b) circular motion. c) rectilinear motion.

10. Give an example for following types of motion:

1. Linear Motion. 2. Circular Motion.  3. Rotatory Motion. 

Ans: 1. A moving carin a straight line is an example of a linear motion.

2. Motion of blades of fan is an example of circular motion.

3. Rotation of earth on its axis is an example of rotatory motion.

Answer the following question in detail

1. Discuss significance of measurement?

Ans: measurement helps us to compare unknown quantity with known quantity. Measurement helps us make quantitative statements about something like how big, how long, how fast .

2. What are the different means of transport on land, air and water?

Ans: The different means of transport on land are : train, Bus, Car,

The different means of transport in air are : Aero planes , Gliders, Space ship

The different means of transport on water are : Ships, Boats

3. What is the need of standard unit for measurements?

Ans: For uniformity all over the world we need standard unit for measurements.

4. What is multiple motions. Explain?

Ans: The motion of a body some time may be combination of two or more types of motion called multiple motion. For example : Motion of earth around sun is Translatory  motion where as Motion of earth on its axis is rotatory motion.

5.How can you measure  length of a curved line?

(a) First of all we have to take a thread

(b) Now move the thread along the path of the curved surface 

(c) Mark the thread at the end point up to which you want to measure the length 

(d) Place the thread on the scale starting from zero to the marked end point.

(e)  Measure this length by the help of the scale

CBSE : 6th Science:Measuring distance and motion : Quest Time

Measurement and Motion :Quest Time

Answer the following question in one word

1. Name one object that shows multiple motions?

Ans: The Earth - Rotatory and translator motion

Drilling - Rotatory and downward translator motion

A ball moving along the ground- Rotatory and Rectilinear motion    

2. How will you measure length in SI system?

Ans: Using meter scale

3. What is the quantity that can be measured?

Ans: Physical quantity like mass, length and Time

4. What type of motion body moves as a whole?

Ans: Translatory motion

5.Which kind of motion produce sound?

Ans: Vibratory motion

6. What types of motion is noticed in the pendulum of clock and swing?

Ans: Oscillatory motion and periodic

7.  Falling of apple from tree is what types of motion?

Ans: Rectilinear motion.

8. Discovery of what made transport easy?

Ans: Wheel

9. Motion in which the distance from the axis remain same?

Ans: Circular motion

10. To and fro motion of a body about a fix point is example of what type of motion?

Ans: Oscillatory

11. What is motion?

Ans: The change in the position of an object with time is called motion.

12. What is the S.I unit of length?

Ans: The S.I unit of length is metre which is written as 'm'.

13. What is measurement?

Ans: The comparison of an unknown quantity with a standard known quantity is known as measurement.

14. What is unit?

Ans: A quantity adopted as a standard of measurements of a physical quantity is called a unit.

15. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and on the other end is 33.1 cm. What is the length of needle?

Ans: The length of the needle = (33.1-3.0) cm = 30.1 cm

VI assignments: Science: CH-6 Measurement and Motion

CBSE VI Animal Form and Functions Solution By Jsunil Tutorial

Class VI Chapter: Animal Form and Functions

JSUNIL TUTORIAL, SAMASTIPUR, BIHAR

Q1. Name the system that transports nutrients oxygen and waste?

Ans: Circulatory system

Q.2. The mouth is the part of which bodily system?

Ans: Digestive system

Q.3. kidney is part of which system?

Ans: Excretory system

Q.4. what are the animals with back bone known as?

Ans: vertebrates.

Q.5. which fin of fish help to swim?

Ans: Paired fins

Q.6. Do the joint between rib and breast bone allow movement?

Ans: No

Q.7. How many bone a human body have?

Ans: A child have 306 bones  some of which latter fuse hence  fully grown body have 206 bones

Q. 8. Name the organism born with extra rib called gorilla rib?

Ans: Gorilla

Q.9. What is the given to the first vertebra of the vertebral column support skull?

Ans: Atlas and bones called yes bones

Q.10. What is science in which we study about bones?

Ans: Osteology.

Q.11. What is science in which we study about muscles?

Ans: Myology.

Q.11. Name the two organ protected by rib cage?

Ans: Heart and Lungs

Q.12. Define cell and tissue?

Ans: cell is basic and functional unit of Life. A group of similar cell is called tissue.eg. bones, blood

Q.13. What is bone marrow. Mention its functions?

Ans: A soft substance present in bones called Bone marrow. it makes blood cell.

Q.14. What is joint what are its types?

Ans: The place where two bones join together is called joints. Types of joints are

Fixed joint, Ball and socket joints, Hing Joint, Gliding Joints, Pivotal joint.

Q. 15.What is organ system? Name organs of digestive system?

Ans: A group of Organs form organ system. Mouth, esophagus, stomach and intestine form digestive system

Q.16. what is ball and Socket joints?

Ans: The joint that allows movement in all direction is called ball and socket joint .like arm, Shoulder, hip and Thigh joints.

Q.17.Explain three types of skeleton?

Ans: Skeleton found outside the body is called exoskeleton like Skeleton of crab and snail.  It ptotect, give sense and help in feeding and excretion.

Skeleton found inside the body is called endoskeleton like Skeleton of fish, bird reptiles etc.

Skeleton found inside the body in the form of liquid is called liquid skeleton like Skeleton of earth worm, caterpillar.

Q.18. what are the types joints?

Ans: Types of joints are:

Fixed joint -Skull

Ball and socket joints- arm, shoulder, hip and Thigh joints.

Hinge Joint :- knee, elbow and Ankle

Gliding Joints- backbone,sole of foot

Pivotal joint.- Neck

Q.19. how do muscles help to move bones?

Ans: A pairs of muscles helps bone to move.  When one of them contracts, the bone is pulled in that direction. The other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts to pull the bone towards its original position, while the first relaxes.

20. Differentiate between Floating and Fixed rib.

Ans: The last two pairs of ribs which are free called floating rib. Whereas rest of 10 pairs which are   not free and forma cage is called fixed rib.