Quiz Physics

1. If we add all the 7 colours of rainbow (red, yellow, blue, green, orange, violet and indigo), the resultant colour would be?
(A) White
(B) Black
(C) Maroon
(D) Dark Blue

2. When white light passes through a prism, it splits into __________ colours.
(A) 3
(B) 5
(C) 7
(D) 9

3. A camera uses a __________ to form an image on a piece of film at the back.
(A) convex lens
(B) concave lens
(C) diverging lens
(D) none of these

4. Short-sight defect could be corrected by a
(A) convex lens
(B) concave lens
(C) converging lens
(D) none of these

5. Red + Green + Blue = ?
(A) White
(B) Black
(C) Maroon
(D) Dark Blue

1. A
2. C
3. A
4. B
5. A

6. Ozone layer protects the Earth from __________ radiations from the Sun.
(A) microwaves
(B) infrared
(C) X-rays
(D) ultraviolet

7. The distance of Moon from the Earth is __________ km.
(A) 364,000
(B) 384,000
(C) 464,000
(D) 484,000

8. There are __________ planets in orbit around the Sun.
(A) 6
(B) 7
(C) 8
(D) 9

9. Planets are kept in orbit by the?
(A) Attraction among the Planets
(B) Attraction among the Planets and the Sun
(C) Radiations from the Sun
(D) Gravitational pull of the Sun

10. Which from the following is NOT a Renewable Energy?
(A) Geothermal
(B) Solar
(C) Nuclear
(D) Biofuels

6. D
7. B
8. C
9. D
10. C

11. When vapours of a substance are cooled and changes into liquid, it is called
(A) conduction
(B) condensation
(C) convection
(D) evaporation

12. An instrument used to measure gas pressure is called
(A) ammeter
(B) barometer
(C) galvanometer
(D) manometer

13. If we add salt to the pure water, its boiling point will
(A) increase
(B) decrease
(C) remain same
(D) none of these

14. The boiling point of alcohol is
(A) 71 °C
(B) 75 °C
(C) 79 °C
(D) 83 °C

15. The presence of impurities __________ the freezing point of water.
(A) increases
(B) decreases
(C) accelerate
(D) does not have any effect on

11. B
12. D
13. A
14. C
15. B

16. The melting point of ice is lowered by a/an __________ in pressure.
(A) increase
(B) decrease
(C) change
(D) consistency

17. At high altitude the air temperature is lower as compare to sea level, therefore water boils at __________ temperature.
(A) lower
(B) higher
(C) constant
(D) absolute

18. Evaporation is a __________ process.
(A) cooling
(B) Liquefying
(C) condensation
(D) convection

19. The refrigerator works on the two processes
(A) condensation and convection
(B) convection and radiation
(C) radiation and evaporation
(D) condensation and evaporation

20. Air is a very good __________ of heat.
(A) conductor
(B) insulator
(C) radiator
(D) evaporator

16. A
17. A
18. A
19. D
20. B

21. Which radiation has the lowest frequency in the electromagnetic spectrum?
(A) X-rays
(B) Gamma rays
(C) Ultraviolet rays
(D) Radio rays

22. Which rays are useful in cancer treatment?
(A) X-rays
(B) Gamma rays
(C) Ultraviolet rays
(D) Radio rays

23. The speed of sound will be maximum if passing through
(A) vacuum
(B) air
(C) water
(D) iron

24. The wire used to make the filament of a light bulb is made of
(A) nichrome
(B) chromel
(C) tungsten
(D) fire-clay

25. The wire used to make heating elements in electric kettles and irons are made of
(A) nichrome
(B) chromel
(C) tungsten
(D) fire-clay

21. D
22. B
23. D
24. C
25. A

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