Physics Study Material बिभाग ‘‘ग’’ Shared By R. Agarwal

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Study Material: Physics बिभाग ‘ग’

 

1. Constellations appear to change their positions at different times of night because

(1) The earth revolves round the sun

(2) The earth rotates about its axis

(3) The constellations move faster than the earth

(4) The earth and the constellations move in opposite direction

Ans:- (2) The earth rotates about its axis

2. The pole star does not seem to move because

(1) It is line with the earth’s axis of rotation

(2) It moves around the sun and not the earth

(3) Its movement can be seen only during a solar eclipse

(4) It rotates very rapidly

Ans:- (1) It is line with the earth’s axis of rotation

3. Which of the following do not belong to the solar system?

(1) asteroids

(2) Comets

(3) Planets

(4) Nebulae

Ans:- (4) Nebulae

4. Which planet is known as the red planet?

(1) Jupiter

(2) Mars

(3) Venus

(4) Pluto

Ans:- (2) Mars

5. The planet closest to the sun is

(1) Mercury

(2) Venus

(3) Earth

(4) Mars

Ans:- (4) Mars

6. Which planets do not have satellites revolving around them?

(1) Mars and Venus

(2) Mercury and Venus

(3) Mars and Mercury

(4) Neptune and Pluto

Ans:- (2) Mercury and Venus

7. The tail of a comet always points away from the sun due to

(1) Force of repulsion

(2) Centrifugal force

(3) Solar radiation and solar wind

(4) An unknown reason

Ans:- (3) Solar radiation and solar wind

8. Which comet was seen in 1910 and again in 1986

(1) Kohoutek comet

(2) Halley’s comet

(3) Great comet

(4) Holme’s Comet

Ans:- (2) Halley’s comet

9. We see only side of the moon all the time because

(1) The period of rotation of the moon on its axis is equal to its period of evolution around the earth

(2) The moon is stationary

(3) The period of revolution of the moon around the earth is the same as that of the earth around the sun

(4) Unlike the earth, the moon does not rotate on its axis.

Ans:- (1) The period of rotation of the moon on its axis is equal to its period of evolution around the earth

10. What is the source of electric energy in an artificial satellite?

(1) A mini nuclear reactor

(2) A dynamo

(3) A thermopile

(4) Solar cells

Ans:- (4) Solar cells

11. Broad wooden sleepers are placed below the rails to

(1) Act as absorber

(2) Fix the fish plates properly

(3) Hold the rails parallel

(4) Reduce pressure exerted by the train

Ans:- (4) Reduce pressure exerted by the train

12. An artificial satellite can be tracked very precisely from the earth by using

(1) Radar

(2) Sonar

(3) Quasar

(4) Pulsar

Ans:- (1) Radar

13. A GM counter is used for detecting

(1) Underground oil

(2) Coal

(3) Underground water

(4) Radioactivity

Ans:- (4) Radioactivity

14. Stars appear to move from east to west because the

(1) Whole universe is moving from east to west

(2) Earth is revolving around the sun

(3) Earth is rotating from east to west

(4) Earth is rotating from west to east

Ans:- (4) Earth is rotating from west to east

15. On a clear night we can see nearly_____ stars with naked eyes

(1) 3000

(2) 10000

(3) 30000

(4) 100000

Ans:- (1) 3000

16. Heavenly matter landing on the earth’s surface is known as

(1) Meteor

(2) Shooting star

(3) Meteorite

(4) UFO

Ans:- (3) Meteorite

17. Which of the following has equal periods of rotation and revolution?

(1) The moon

(2) Mercury

(3) Venus

(4) Uranus

Ans:- (1) The moon

18. Weight of ac person can be zero when

(1) He is falling freely

(2) He is orbiting in a satellite

(3) He is in an aeroplane flying at a high altitude

(4) He is having ride in a filled balloon.

(a) 1 and 2 are correct

(b) 1 and 4 are correct

(c) 1, 2 and 4 are correct

(d) 1, 2, 3 and 4 are correct

Ans:- (1) He is falling freely

19. Mountain roads wind up gradually and do not go straight up, because

(1) It is easier to construct winding roads

(2) Winding roads offer more friction making driving easier

(3)  On winding roads less force is needed to overcome gravity

(4) Chances of accidents are less on winding roads.

Ans:- (3)  On winding roads less force is needed to overcome gravity

20. For the same total weight and the same fuel supply, a multistage rocket is preferred over a single-stage rocket, because

(1) It is cheaper to build a multistage rocket

(2) It is easier to assemble a multistage rocket

(3) Multistage rocket is safer to launch

(4) The final velocity achieved by a multistage rocket is higher

Ans:- (4) The final velocity achieved by a multistage rocket is higher

21. The earth and the moon are about the same distance from the sun, yet on the average the earth is much warmer than the moon. Why?

(1) The moon is much smaller than the earth

(2) Nights on the moon are much longer

(3) The moon has almost no atmosphere

(4) The surface of the moon is darker

Ans:- (3) The moon has almost no atmosphere

22. There is no Doppler effect for sound when

(1) The source of sound recedes from the observer

(2) The source of sound approaches the observer

(3) The source of sound moves at right angles to the line joining the source and the observer

(4) The source produces a sound of very high frequency

Ans:- (3) The source of sound moves at right angles to the line joining the source and the observer

23. Consider the following electromagnetic waves of different wavelengths.

(1) Ultraviolet

(2) Microwaves

(3) X-rays

(4) Radio waves

Their correct arrangement in the ascending order of wavelength is

(a) 3, 1, 2, 4

(b) 4, 2, 1, 3

(c) 1, 2, 3, 4

(d) 2, 3, 4, 1

Ans:- (1) Ultraviolet

24. A star with a mass of less than 1, 4 solar masses will probably end its life as a

(1) White dwarf

(2) Neutron star

(3) Black hole

(4) Pulsar

Ans:- (1) White dwar

25. Rocks of which planet are likely to float on water?

(1) Mars

(2) Venus

(3) Saturn

(4) Jupiter

Ans:- (3) Saturn

26. Which of Jupiter’s moons are larger than the planet Mercury?

(1) Io

(2) Europa

(3) Ganymede

(4) Callisto

(a) 1 and 2

(b) 1 and 3

(c) 2 and 4

(d) 3 and 4

Ans:- (4) Callisto

27. Which of the following is used as a lubricant in heavy machines?

(1) Bauxite

(2) Sulphur

(3) Phosphorus

(4) Graphite

Ans:- (3) Phosphorus

28. Hydraulic brakes in automobiles work on

(1) Bernoulli’s principle

(2) Posieuille’s principle

(3) Pascal’s principle

(4) Archimede’s principle

Ans:- (2) Posieuille’s principle

29. A hydrogen-filled balloon

(1) always rises in the air

(2) Rises only if its total weight is much less than the weight of air it displaces

(3) Rises only if its total weight is equal to the weight of air it displaces

(4) Can never rise in the air

Ans:- (2) Rises only if its total weight is much less than the weight of air it displaces

30. A barometer can be used for

(1) Measuring atmospheric pressure

(2) Determining altitudes

(3) Measuring density of liquids

(4) Weather forecasting

(a) only 1

(b) 1, 2, and 4

(c) 1 and 4

(d) all the four

Ans:- (3) Measuring density of liquids

31. X-rays are actually

(1) Slow moving electrons

(2) Fast moving electrons

(3) Electromagnetic waves

(4) Slow moving neutrons

Ans:- (1) Slow moving electrons

32. Which of the following statements is incorrect regarding the velocity of sound?

(1) A loud sound travels faster than a feeble sound

(2) Change of pressure has no effect on the velocity of sound in air

(3) Velocity of sound in air increases with temperature

(4) Sound travels faster in steel than in air

Ans:- (1) A loud sound travels faster than a feeble sound

33. Endoscope, used by doctors for examining the inside of a patient’s stomach, works on the principle of

(1) Reflection of light

(2) Dispersion of light

(3) Refraction of light

(4) Total internal reflection of light

Ans:- (4) Total internal reflection of light

34. Which of the following can be made to behave as a superconductor at a temperature of about 100 k?

(1) Glass

(2) Mercury

(3) Soft iron

(4) Ceramics

Ans:- (4) Ceramics

35. Which of the following are semiconductors?

(1) Silicon

(2) Ceramic

(3) Germanium

(4) Quartz

(a) 2 and 4

(b) 1 and 3

(c) 1, 3, and 4

(d) all the four

Ans:- (2) Ceramic

36. In an electric bulb, a little nitrogen or argon is introduced at low pressure to

(1) Cool the hot filament

(2) Prevent evaporation pressure

(3) Withstand atmospheric pressure

(4) Increase atmospheric the filament

Ans:- (2) Prevent evaporation pressure

37. A device used for converting a.c. into d.c is called

(1) Transformer

(2) Rectifier

(3) Induction coil

(4) Dynamo

Ans:- (2) Rectifier

38. The faint illumination of dark side of the moon during a crescent phase is due to

(1) Scattering of light by thin atmosphere of the moon

(2) Sunlight reflected by the earth

(3) Moon’s halo

(4) Diffraction of light caused by moon’s periphery

Ans:- (2) Sunlight reflected by the earth

39. Which planet appears to be the brightest in the night sky?

(1) Jupiter

(2) Saturn

(3) Venus

(4) Mars

Ans:- (3) Venus

40. The only planet on which the sun rises in the west is

(1) Neptune

(2) Pluto

(3) Uranus

(4) Venus

Ans:- (4) Venus

41. The planet similar to our earth in mass, size, and density is

(1) Mars

(2) Venus

(3) Mercury

(4) Uranus

Ans:- (2) Venus

42. ‘Ecliptic’ is the term used for

(1) The path of earth around the sun

(2) The sun when eclipsed

(3) The moon when eclipsed

(4) The sun’s path in the sky during a year

Ans:- (4) The sun’s path in the sky during a year

43. An egg sinks in tap water but floats in a concentrated solution of salt because

(1) Egg absorbs salt from the solution and expands

(2) Albumin dissolves in salt and egg becomes lighter

(3)  The density of salt solution exceeds the density of egg

(4) Tap water has higher surface tension

Ans:- (3)  The density of salt solution exceeds the density of egg

44. In cold regions, where temperature may fall below 0⁰C, farmers fill their fields with water to protect their crops from damage because

(1) Water is abundantly available in cold regions

(2) Water has high specific heat capacity

(3) Water has low specific heat capacity

(4) Plenty of water is absorbed by soil in cold regions

Ans:- (2) Water has high specific heat capacity

45. The part of the human eye which performs a function similar to that of aperture in a photographic camera is

(1) Iris

(2) Lens

(3) Pupil

(4) Ciliary muscles

Ans:- (3) Pupil

46. The f-number in a photographic camera is equal to

(1) The diameter of the aperture

(2) The reciprocal of the diameter of the aperture

(3) The focal length of the lens divided by the diameter of the aperture

(4) The product of the focal length and the diameter of the aperture.

Ans:- (3) The focal length of the lens divided by the diameter of the aperture

47. The inside of a photographic camera is coated black to avoid

(1) Scattering of light

(2) Total internal reflection of light

(3) Reflection of light

(4) Absorption of light

Ans:- (3) Reflection of light

48. A photoelectric cell converts

(1) Electric energy to light energy

(2) Heat energy to chemical energy

(3) Light energy to chemical energy

(4) Light energy to electric energy

Ans:- (4) Light energy to electric energy

49. The Hubble space telescope has fixed the age of the universe at

(1) 1-2 million years

(2) 8-12 million years

(3) 1-2 billion years

(4) 8-12 billion years

Ans:- (4) 8-12 billion years

50. A ball B₁ is through horizontally and another ball B₂ is just released from the same height such that it falls vertically. It is found that

(1) B₁ touches the ground first

(2) B₂ touches the ground first

(3) B₁ takes double the time to touch ground

(4) Both B₁ and B₂ touch the ground simultaneously.

Ans:- (4) Both B₁ and B₂ touch the ground simultaneously.