General Physics MCQ Solved Paper for DRDO

1. The heat generated in a conductor carrying current is proportional to
A. the resistance
B. the square of the current flowing through it
C. the time the current flows
D. All the above
Answer : D

2. Hydrophone is an instrument used
A. for measuring relative density of liquids
B. by ships to pass on messages
C. for determining the depth of ocean bottoms etc.
D. by deaf people to aid hearing
Answer : C

3. Electron-volt is a unit of
A. power
B. velocity
C. energy widely used in nuclear physics
D. number of electrons
Answer : C

4. The maximum range of most TV signals is from 121 to 240 km only because
A. the curvature of earth limits the range of reception
B. the signals are weak
C. the signals are absorbed by air
D. the antennae are not powerful enough
Answer : A

5. In a freezer ice cubes will be formed more quickly in trays made of
A. rubber
B. plastic
C. aluminium
D. wood
Answer : C

6. A permanent magnet may be demagnetised by
A. placing it inside a solenoid through which an alternating current is flowing
B. heating the magnet to redness and then allowing it to cool
C. dropping it several times or hammering it while lying east-west
D. All the above
Answer : D

7. Of the following types of electromagnetic radiation which has the longest wavelength?
A. ultraviolet rays
B. gamma rays
C. radio waves
D. infrared waves
Answer : C

8. Moon has no atmosphere because
A. it has no population
B. it is quite far off
C. its surface is full of rocks
D. its gravity is not sufficient for any atmosphere to hold on to it
Answer : D

9. Velocity of sound in high altitudes is low because at such a height
A. the temperature is low
B. there is no air
C. the pressure is low
D. All the above
Answer : A

10. In a vacuum the following three articles are dropped at the same time and from the lame height. Which will reach the ground quicker?
A. a stone
B. a piece of wood
C. a feather
D. all will reach the ground at the same time
Answer : D

11. The Cact that the compass needle does not point true north was observed first by
A. Sir Isaac Newton
B. Columbus
C. Archimedes
D. Thomas Alva Edison
Answer : B

12. The weight of a body is
A. maximum at the equator
B. minimum at the equator
C. minimum at the poles
D. the same everywhere
Answer : B

13. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
A. increase
B. decrease
C. remain the same
D. first decrease and then increase
Answer : B

14. SONAR (Sound Navigation Ranging) is
A. used by warships and military aircraft to locate enemy submarines
B. used by ships to determine the depth of water beneath them
C. a detective device that uses sound to locate under - water objects
D. All the above
Answer : D

15. 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

16. 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

17. When temperature decreases, resistance of metals to flow of electricity
A. increases
B. decreases
C. neither increases nor decreases
D. first increases then decreases
Answer : B

18. Alternating Current (AC) is more advantageous than direct current because
A. it can be transmitted easily and efficiently
B. Alternating Current (AC) loses the least amount of energy when transmitted at high voltages
C. Alternating Current (AC) voltage can be easily increased or decreased
D. all the above
Answer : D

19. When we tighten the string of a sitar or tanpura its pitch
A. remains the same
B. increases
C. decreases
D. None of the above
Answer : B

20. The inability of a body to change its state of rest or uniform motion along a straight line is called its
A. momentum
B. velocity
C. acceleration
D. inertia
Answer : D

21. The completely dark portion of a shadow of an object is known as
A. umbra
B. penumbra
C. image
D. black portion of light
Answer : A

22. The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than a beaker full of boiling water. But
A. the hot water contains a much larger quantity of internal energy than the boiling water
B. the boiling water contains more quantity of internal energy than the warm water
C. both of them have got the same amount of internal energy.
D. nothing can be said definitely with the data given
Answer : A

23. The minimum velocity required by a satellite to escape earth's gravitational pull is
A. 18 km/s
B. 11.2 km /s
C. 21 km/s
D. 35 km/s
Answer : B

24. A pair of stars that revolve round each other is
A. a neutron star
B. a binary star
C. a dwarf star
D. a polar star
Answer : B

25. Solar radiation is preferred to other sources of energy because
A. it is practically inexhaustible
B. it is the cheapest form of energy
C. it does not cause pollution
D. All of the above
Answer : D

26. Velocity of sound in high altitudes is low because at such a height
A. the temperature is low
B. there is no air
C. the pressure is low
D. All the above
Answer : A

27. When a satellite is In a geostationary orbit the force keeping it in orbit Is
A. zero
B. the centrifugal force
C. reaction due to steady burning of fuel
D. the gravitational pull on the body by the earth is the weight of the body which provides the centripetal force
Answer : D

28. 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

29. Mercury does not stick to glass because
A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
B. the adhesive forces between mercury and glass molecules are greater than the cohesive forces
C. both the cohesive and adhesive forces are equal
D. None of the above
Answer : A

30. The distance between two bodies is halved. Now the force of attraction between them will be
A. half
B. one fourth
C. four times
D. two times
Answer : C

31. The hygrometer is an apparatus used for finding the
A. temperature of air
B. intensity of light
C. density of a liquid
D. relative humidity of the atmosphere
Answer : D

32. The stem of a vibrating tuning fork is pressed against a sound box. Then
A. the loudness of the sound increases
B. the loudness remains the same
C. the loudness decreases
D. the sound suddenly stops
Answer : A

33. A projectile is fired at an angle with the horizontal with a small velocity. Its horizontal range will be maximum when the angle with the horizontal is
A. 0°
B. 30°
C. 45°
D. 60°
Answer : C

34. The function of a ruse wire is
A. to stabilise the voltage
B. to decrease the current supply
C. to increase the current supply
D. to prevent an unduly high current from passing through a circuit
Answer : D

35. X-rays were discovered by
A. Wilhelm Roentgen
B. WO Coolidge
C. Henry Cavendish
D. William Watson
Answer : A

36. A temperature below absolute zero for an ideal gas
A. cannot be attained experimentally
B. can be attained
C. is impossible
D. Does not exist at all
Answer : C

37. In an electrical circuit, a fuse is connected
A. in the live wire
B. in the neutral wire
C. in the earth wire
D. anywhere
Answer : A

38. The barometer was invented by
A. Michael Faraday
B. Torricelli
C. Thomas Alva Edison
D. Benjamin Franklin
Answer : B

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

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

41. 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

42. When a charged rod is brought near a collection of small pith balls, the balls
A. will jump rapidly up and down for a short time
B. will remain unaffected
C. Both (a) and (b) above
D. It will produce electric shock
Answer : A

43. 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

44. The electrical domestic tube light gives white fiourescent light because of
A. collision between molecules of filled gas under electric current
B. heavy current
C. vacuum inside the tube
D. falling of ultra violet rays on the white inner coating of the tube
Answer : D

45. The atmosphere gets heated up mainly by
A. direct sun's rays
B. radiation from earth's surface
C. radiogenic heat (resulting from radioactive decay)
D. cosmic rays coming from space
Answer : B

46. 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

47. An astronomical unit of distance is
A. a kilometre
B. light year
C. the average distance from the earth to the sun
D. None of the above
Answer : C

48. Mercury does not stick to glass because
A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
B. the adhesive forces between mercury and glass molecules are greater than the cohesive forces
C. both the cohesive and adhesive forces are equal
D. None of the above
Answer : A

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

50. Alpha particles are
A. electromagnetic radiations
B. helium nuclei
C. negatively charged particles
D. neutral particles
Answer : B