Physics solved MCQs

1 of 50

1. A light year is a measure of :

a. Speed

B. Velocity

c. Distance

d. Time

2. A device which is used to limit the current in an electrical circuit is called a -

a. Grid

B. Fuse

c. Hub

d. Conductor

3. Two rods, one of copper and other of steel, experience the same up thrust when placed in water. Thus, both have –

a. equal volume

B. equal weight

c. equal density

d. equal mass

4. Minimum numbers of unequal vectors which can give zero resultant are -

a. Two

B. Three

c. Four

d. More than four

5. Water is not suitable as a calorimetric substance because it –

a. has high specific heat

B. is a good conductor

c. has high boiling point

d. low latent heat of vaporization

6. When a body falls from an aeroplane, there is increase in its –

a. Kinetic energy

B. Mass

c. Acceleration

d. Potential energy

7. Which among the following types of coal produces most heat per unit?

a. Coal

B. Lignite

c. Anthracite

d. Pit

8. Which among the following waves is used for communication by artificial satellites?

a. Micro waves

B. Radio waves

c. A. M.

d. Frequency of 1016 series

9. Energy is continuously created in the sun due to –

a. Nuclear fusion

B. Nuclear fission

c. Radioactivity

d. Artificial radioactivity

10. When the barometer reading dips suddenly, it is an indication of –

a. Hot weather

B. Calm weather

c. Storm

d. Dry weather

11. Good conductor of electricity is –

a. dry air

B. paper

c. kerosene

d. graphite

12. The fourth state of matter is known as

a. Gas

B. Vapour

c. Plasma

d. Electrons

13. Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as ______.

a. light waves

B. electromagnetic waves

c. electric waves

d. magnetic waves

14. Which one of the following instruments is used to study dispersion of light?

a. Microscope

B. Telescope

c. Spectrometer

d. Photometer

15. A falling drop of rain water ac-quires the spherical shape due to –

a. Viscosity

B. Surface Tension

c. Atmospheric pressure

d. Gravitational force

16. This scientist gave the law- ‘Properties of elements are a periodic function of their atomic number.’ This property of the fundamental importance of atomic number was discovered by-

a. Johann Wolfgang Döbereiner

B. John Newlands

c. Dmitri lvanovich Mendeléev

d. Henry Moseley

17. The mass and energy equivalent to 1 a.m.u. respectively are -

a. 1.67 x 10−27 g, 9.30 MeV

B. 1.67 x 10−27kg, 930 MeV

c. 1.67 x 10−27kg, 1 MeV

d. 1.67 x 10−34 kg, 1 MeV

18. A spherical ball made of steel when dropped in mercury container will –

a. sink in mercury

B. will be on the surface of mercury

c. will be partly immersed mercury

d. will dissolve in mercury

19. The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as –

a. Audible sounds

B. Ultrasonics

c. Infrasonics

d. Megasonics

20. Gamma rays have greatest similarity with –

a. α-rays

B. β-rays

c. X-rays

d. U.V.-rays

21. In the absence of ozone layer, Which rays will enter into atmosphere?

a. Infrared

B. Visible

c. Ultraviolet

d. X-rays

22. Light year is the unit of -

a. Frequency

B. Distance

c. Energy

d. Power

23. An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's –

a. First law

B. Second law

c. Third law

d. Fourth law

24. Cathode rays when obstructed by metal cause emission of -

a. γ – ray

B. X – ray

c. α – ray

d. β – ray

25. Sensation of sound persists in our brain for about -

a. 0.001s

B. 0.2s

c. 0.1s

d. 10s

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