NDA - General Physics 1000+ MCQ [Solved] PDF Download

1. We see the sun before it actually rises on the horizon. This is due to
A. refraction
B. reflection
C. total internal reflection
D. parallax
Answer : A

2. The planet that has got a well-developed set of rings is
A. Venus
B. Saturn
C. Mercury
D. Earth
Answer : B

3. X-rays are used
A. in hospital in the treatment of malignant growth
B. to reveal hidden flaws in metal castings and welded joints
C. to detect alterations made in works of art
D. All the above
Answer : D

4. The cover of a solar cooker is made of glass because
A. it absorbs sun's rays
B. it reflects sun's rays
C. it retains the heat inside by the greenhouse effect
D. it radiates heat better than metals
Answer : C

5. When light travels from one medium to another there is a change in its
A. velocity
B. wavelength
C. frequency
D. Both (a) and (b) above
Answer : D

6. The star nearest to the sun is
A. Proxima Centauri
B. Sirius
C. Aldebaran
D. Vega
Answer : A

7. The direction of heat flow between two objects depends on
A. their heat contents
B. their masses
C. their temperatures
D. whether they are in solid, liquid or gaseous state
Answer : C

8. If an object is placed between two parallel plane mirrors, the number of images formed will be
A. 1
B. infinite
C. 0
D. 4
Answer : B

9. An electric fan converts
A. electrical energy into heat energy
B. electrical energy into mechanical energy
C. mechanical energy into electrical energy
D. mechanical energy into heat energy
Answer : B

10. Body A is kept in contact with body B. Heat will flow from A to B if
A. the heat content of A is greater than that of B
B. the temperature of A is greater than that of B
C. the specific heat of A is greater than that of B
D. the specific heat of B is greater than that of A
Answer : B

11. A balloon ruled with hydrogen will
A. continue going upwards uninterrupted
B. reach a particular height and remain floating
C. burst after reaching some height
D. reach a particular height and start coming down
Answer : B

12. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
A. the pores in the pot are closed
B. rain water stops oozing out from the pores
C. the water that oozes out does not evaporate quickly because of the large percentage of moisture in the air
D. surface of the pot becomes damp
Answer : C

13. The motion .of the pendulum of a wall clock is an example of
A. linear motion
B. vibratory motion
C. rotational motion
D. None of the above
Answer : B

14. Air pressure is usually highest when the air is
A. warm and moist
B. cool and dry
C. warm and dry
D. cool and moist
Answer : D

15. The brightest planet in the Solar System is
A. Jupiter
B. Mercury
C. Venus
D. Sirius
Answer : C

16. The period of a geostationary (synchronous) satellite orbiting the earth over the equator la
A. 16 hours
B. 12 hours
C. 20 hours
D. 24 hours
Answer : D

17. The heat produced in a conductor due to the passage of a current through it is proportional to
A. the square of the current
B. the resistance of the conductor
C. the time for which the current flows
D. All the above
Answer : D

18. Heat is transmitted from one end of a metal rod to its other end by the method of
A. conduction
B. convection
C. radiation
D. sublimation
Answer : A

19. When a bowler spins a ball, it changes its direction in the air. This is due to
A. turbulence caused by the wind
B. buoyancy of air
C. unequal pressures acting on it
D. sudden change in the direction of the wind
Answer : C

20. Which physical quantity is measured in watts
A. power
B. kinetic energy
C. momentum
D. impulse
Answer : A

21. In very cold countries alcohol is used as a thermometric liquid because
A. alcohol is a poor conductor of heat
B. alcohol can be coloured for its level to be seen easily
C. its freezing point is very low
D. it will not stick to the glass tube
Answer : C

22. The stars that shine brightly then dimly and then brightly are known as
A. meteors
B. binaries
C. variable stars
D. bright stars
Answer : C

23. Fish and other aquatic creatures can live inside a deep frozen pond because
A. fish are cold-blooded animals
B. ice is a bad conductor of heat
C. there will always be water just beneath the ice level
D. they can adapt themselves to live in ice
Answer : C

24. The speed of light is minimum while passing through
A. air
B. glass
C. vacuum
D. water
Answer : B

25. To get 5 images of a single object one should have two plane mirrors inclined at an angle of
A. 72°
B. 60°
C. 36°
D. 90°
Answer : B

26. The mode of travel of heat energy from the sun across the empty space beyond the earth's atmosphere is known as
A. conduction
B. convection
C. radiation
D. absorption
Answer : C

27. The transistor was invented by
A. Marconi
B. Baird
C. John Bardeen, Walter H. Brattain and William Shockley
D. Edison
Answer : C

28. The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is
A. Hygrometer
B. Hypsometer
C. Hydrometer
D. Densimeter
Answer : C

29. Pieces of camphor placed on water move about rapidly. This is because of
A. diffusion
B. viscosity
C. surface tension
D. capillarity
Answer : C

30. It is easier to climb down a staircase than climb up because in climbing down
A. work is done against gravity
B. the steepness of the staircase isn't felt
C. gravity assists
D. there is no friction between the legs and steps
Answer : C

31. The sun continuously produces an enormous amount of energy. This is due to
A. nuclear fission
B. nuclear fusion
C. chemical combustion
D. boiling
Answer : B

32. When a body Is taken to the poles from the equator, Its weight becomes
A. greater
B. less
C. the same
D. None of these
Answer : A

33. When water is cooled from 4�C to 2�C its density
A. increases
B. decreases
C. remains the same
D. first increases then decreases
Answer : B

34. Formation of shadows can be explained by
A. rectilinear propagation of light
B. reflection
C. refraction
D. total internal reflection
Answer : A

35. The earth satellite Aryabhatta was put in orbit by India on
A. October 20, 1978
B. November 14, 1978
C. January 26, 1979
D. April 19, 1975
Answer : D

36. When a steel ball is placed on the surface of mercury, it does not sink because
A. of the surface tension of mercury
B. mercury is a semi-solid
C. of the high viscosity of mercury
D. the density of mercury is greater than that of steel
Answer : D

37. The aneroid barometer uses
A. mercury
B. distilled water
C. alcohol
D. does not use any liquid
Answer : D

38. Changing of one element into another element is known as
A. transmutation
B. fission
C. fusion
D. radioactivity
Answer : A

39. Dioptre is the unit of power of
A. convex mirrors
B. concave mirrors
C. concave lenses
D. lenses irrespective of types
Answer : D

40. The world's first artificial satellite Sputnik I was launched by Russia in
A. 1985
B. 1957
C. 1959
D. 1960
Answer : B

41. What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?
A. 18 km/sec
B. 11.2 km/ sec
C. 21 km/ sec
D. 35 km/ sec
Answer : B

42. A lightning conductor installed in a building
A. does not allow the lightning to fall on the building at all
B. drives away the charged clouds
C. forces the lightning to fall on other buildings near that building
D. conducts the electric charges to the ground when lightning strikes the building
Answer : D

43. Warm air will hold more water vapour than cold air because
A. it is lighter
B. it has more water vapour in it
C. its molecules are close together
D. its molecules are far apart
Answer : D

44. The presence of impurities
A. lowers the melting point of ice
B. raises the melting point of ice
C. has no effect on the melting point of ice
D. may lower or raise the melting point depending upon the type of impurities
Answer : A

45. A bar magnet tied in the middle with a thread is suspended at the South Pole of the earth. The magnet will be in
A. a horizontal position
B. a nearly vertical position with its South Pole downwards
C. a nearly vertical position with its North Pole downwards
D. a slanting position
Answer : C

46. The velocity of sound in air
A. increases as the square root of the absolute temperature
B. decreases with temperature
C. is independent of temperature
D. None of these
Answer : A

47. Every action has an equal and opposite reaction is Newton's law of Motion
A. first
B. second
C. third
D. fourth
Answer : C

48. Like magnetic poles
A. attract each other
B. repel each other
C. neither attract nor repel
D. attract or repel depending upon the conditions
Answer : B

49. In a hydraulic pressure
A. force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston
B. the distance the small piston moves is equal to the distance the large piston moves
C. applied pressure is equally transmitted throughout the liquid in all directions
D. force acting on small piston is equal to the force acting on large piston
Answer : C

50. Pieces of camphor placed on water move about rapidly. This is because of
A. diffusion
B. viscosity
C. surface tension
D. capillarity
Answer : C