Page 218 - Class 8th Physics Objective Questions and Answers Chapter - Some Natural Phenomena

Chapter – Some Natural Phenomena

1. When negative and positive charges meet, bright streaks of light are produced. What is this process called?
(A) Electrical discharge
(B) Electric current
(C) Electric heat
(D) Electric light
Answer :- (A) Electrical discharge

2. In how many years BC was amber known to attract light objects like hair when rubbed with fur?
(A) 700 BC
(B) 600 BC
(C) 500 BC
(D) 400 BC
Answer :-  (B) 600 BC

3. Trident shaped metal strip is installed on schools or buildings?
(A) For beauty
(B) To avoid electrical discharge
(C) For strength
(D) to absorb light
Answer :-  (B) To avoid electrical discharge

4. What is the result of earthquake strength expressed?
(A) By Richter scale
(B) By thermometer
(C) Barometer
(D) Seismograph
Answer :- (A) By Richter scale

5. What should we not touch during a thunderstorm?
(A) Telephone
(B) electrical wire
(C) Metal pipes
(D. ALL OF THE ABOVE
Answer :- (D) All of the above

6. Do homogeneous charges repel each other?
(A) Repelled
(B) attracted
(C) absorbed
(D. ALL OF THE ABOVE
Answer :- (A) Repelled

7. What is lightning?
(A) Electric spark
(B) Electroscope
(C) Lightning conductor
(D) core
Answer :- (A) Electric spark

8. Where is the probability of earthquake occurring?
(A) Where Platonic limits are weak
(B) below the surface of the sea
(C) Eruption of volcano in the sea
(D) Cyclone
Answer :- (A) Where Platonic limits are weak

9. What comes out when the plug becomes loose in the socket?
(A) fire
(B) air
(C) Sparks
(D) smoke
Answer :- (C) Sparks

10. What should be done for protection from lightning?
(A) Taking shelter under a tall tree
(B) lying on the ground
(C) Hiding near the tractor
(D) should stay in a closed room
Answer :- (D) Should stay in a closed room.

11. With which substance should a steel spoon be rubbed to produce a spark?
(A) Polythene
(B) Woolen clothes
(C) Both A and B
(D) paper
Answer :-  Both A and B

12. What is lightning discharge called?
(A) charge
(B) lightning
(C) Repulsion
(D) Earthquake
Answer :- (B) Lightning

13. What is obtained when plastic refill is rubbed with polythene?
(A) Electric charge
(B) Electric current
(C) Friction
(D) Electric heat
Answer :- (C) Friction

14. Which of the following cannot be easily charged by rubbing?
(A) Copper rod
(B) Plastic scale
(C) Woolen clothes
(D) inflated balloon
Answer :- (A) Copper rod

15. A major disaster in Jharkhand which affects most people?
(A) Earthquake
(B) lightning
(C) Flood
(D) Tsunami
Answer :- (B) Lightning

16. How many types of charges are there?
(A) three
(B) four
(C) two
(D) five
Answer :- (C) two

17. What are the two types of charges?
(A) positive charge
(B) Negative charge
(C) both a and b
(D) zero charge
Answer :- (C) Both a and b

18. Which of the following cannot be easily charged by friction?
(A) Plastic scale
(B) Copper rod
(C) Inflated balloon
(D) Woolen clothes
Answer :- (D) Woolen clothes

19. What remains safe during lightning?
(A) Mobile phone
(B) Cordless phone
(C) Keeping the bulb lit
(D. ALL OF THE ABOVE
Answer :- (D) All of the above

20. By what is the electric charge sent from one charged object to another object?
(A) By metallic conductor
(B) By lightning conductor
(C) metallic substance
(D) by lightning
Answer :- (A) By metallic conductor

21. Earth waves produce waves on the earth's surface. What are these waves called?
(A) Seismic waves
(B) Earthing
(C) underground nuclear waves
(D. ALL OF THE ABOVE
Answer :-- (A) Seismic waves