1. Burning of wood and coal causes’ __________of air.
2. Species found only in a particular area is known as _______.
3. Migratory birds fly to faraway places because of __________
4. Sound can travel through
(a) Gases only
(b) Solids only
(c) Liquids only
(d) Solids, liquids and gases
5. Time taken by an object to complete one oscillation is called __________.
6. The unit of frequency is __________
7. Sound cannot travel in vacuum. (T/F)
8. The process of depositing a layer of any desired metal on another material by means of electricity
is called _________
9. Which of the following cannot be charged easily by friction?
(a) A plastic scale
(b) A copper rod
(c) An inflated balloon
(d) A woolen cloth.
10. The passage of an electric current through a solution causes ______________ effects.
11. List two states in India where earthquakes are more likely to strike
12. Person 1 m in front of a plane mirror seems to be _______________ m away from his image.
13. Image formed by a plane mirror is
(a) Virtual, behind the mirror and enlarged.
(b) Virtual, behind the mirror and of the same size as the object.
(c) Real at the surface of the mirror and enlarged.
(d) Real, behind the mirror and of the same size as the object.
14. Which of the following is NOT a member of the solar system?
(a) An asteroid
(b) A satellite
(c) A constellation
(d) A comet
15. The planet which appears reddish in colour is ____________.
16. A group of stars that appear to form a pattern in the sky is known as a ________.
17. Which of the following is not a greenhouse gas?
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Methane
(d) Nitrogen
18. Define earthquake.
Answers
AnswEr:
1. Burning of wood and coal causes pollution of air.
2. Species found only in a particular area is known as endemic species.
3. Migratory birds fly to faraway places because of climatic change.
4. Sound can travel through
(a) Gases only
(b) Solids only
(c) Liquids only
(d) Solids, liquids and gases
5. Time taken by an object to complete one oscillation is called Time period.
6. The unit of frequency is hertz.
7. Sound cannot travel in vacuum. (T/F)
Ans - False.
8. The process of depositing a layer of any desired metal on another material by means of electricity is called Electro plating.
9. Which of the following cannot be charged easily by friction?
(a) A plastic scale
(b) A copper rod
(c) An inflated balloon
(d) A woolen cloth.
10. The passage of an electric current through a solution causes chemical effects.
11. List two states in India where earthquakes are more likely to strike
Ans - Jammu & kashmir and Assam.
12. Person 1 m in front of a plane mirror seems to be 2 m away from his image.
13. Image formed by a plane mirror is
(a) Virtual, behind the mirror and enlarged.
(b) Virtual, behind the mirror and of the same size as the object.
(c) Real at the surface of the mirror and enlarged.
(d) Real, behind the mirror and of the same size as the object.
14. Which of the following is NOT a member of the solar system?
(a) An asteroid
(b) A satellite
(c) A constellation
(d) A comet
15. The planet which appears reddish in colour is mars.
16. A group of stars that appear to form a pattern in the sky is known as a constellations.
17. Which of the following is not a greenhouse gas?
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Methane
(d) Nitrogen
18. Define earthquake.
Ans - An earthquake is a sudden shaking or trembling of the earth which lasts for a short time