General Physics 1000+ MCQ with answer for GRE

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

2. 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

3. When sound waves travel from one medium to another, the quantity which remains unchanged is its
A. speed
B. frequency
C. wavelength
D. All the above
Answer : B

4. When light passes from air to glass, its velocity in glass
A. increases
B. decreases
C. remains unchanged
D. first decreases then increases
Answer : B

5. Less dew is formed on cloudy nights because
A. there is no moisture in the atmosphere
B. clouds absorb the falling dew
C. objects emit radiant energy very fast on such nights
D. objects lose less radiant energy
Answer : D

6. 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

7. The function of a moderator in a nuclear reactor is
A. to absorb unwanted neutrons
B. to slow down the fast neutrons to secure more effective hits on other nuclei
C. to decrease the number of fissile nuclei
D. to increase the number of fissile nuclei
Answer : B

8. When the resistance of a circuit increases the current will
A. increase
B. decrease
C. remain the same
D. None of the above
Answer : B

9. Which of the following can produce electricity?
A. resistor
B. thermocouple
C. light bulb
D. neon tube
Answer : B

10. Sound travels fastest in
A. air
B. water
C. iron
D. vacuum
Answer : C

11. The mirage is a phenomenon
A. generally considered as a desert happening
B. caused by unequal heating of the several layers of the atmosphere above the desert
C. in which the refracted rays take a curved path resulting in total internal refection
D. All the above
Answer : D

12. Holography is the technique of
A. taking photos of various objects
B. recording and reproducing three dimensional images
C. tracing out planets and stars in the sky
D. transmitting light waves
Answer : B

13. 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

14. No current will flow between two charged bodies if they have the same
A. resistance
B. charge
C. potential
D. charge/potential ratio
Answer : C

15. A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by
A. decreasing the radius of the capillary tube
B. increasing the radius of the capillary tube
C. increasing the height of water in the vessel
D. None of these
Answer : A

16. 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

17. In a refrigerator, the refrigerant is
A. Nitrogen
B. Oxygen
C. Chlorine
D. Freon
Answer : D

18. The extremely luminous objects located at the centre of some distant galaxies and which are sources of high energy electromagnetic radiation are known as
A. Nebulae
B. Quasars
C. Meteors
D. Comets
Answer : B

19. Water has maximum density at
A. 0° C
B. -15° C
C. 4° C
D. 15° C
Answer : C

20. 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

21. The coil of an electric heater is made of
A. Platinum
B. Tungsten
C. Nichrome
D. Copper
Answer : C

22. 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

23. When a swing la drawn to a side Its potential energy In relation to the earth
A. increases
B. decreases
C. remains the same
D. is constant
Answer : A

24. 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

25. A ship sailing from a river to the sea
A. sinks less in the sea
B. sinks more in the sea
C. neither sinks more nor less in the sea
D. sinking more or less depends on sea
Answer : A

26. Which of the following is known as freon?
A. Liquid ammonia
B. Carbon tetrafluoride
C. Dichloro-difluoro-methane
D. Sulphur dioxide
Answer : C

27. The heating element often used in an electric iron is
A. copper
B. tungsten
C. mica
D. nichrome
Answer : D

28. A pressure gauge for fluids is called
A. a hydrometer
B. a manometer
C. a lactometer
D. an anemometer
Answer : B

29. 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

30. The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
A. chemical energy into heat energy
B. mechanical energy into heat energy
C. protons into neutrons
D. mass into energy according to Einstein's equation
Answer : D

31. The filament lamp is an example for
A. fluorescence
B. incandescence
C. both (a) and (b)
D. None of these
Answer : B

32. 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

33. The device used to record the sound is
A. a microphone
B. a headphone
C. a phonograph
D. an amplifier
Answer : C

34. A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be
A. a parabola
B. a horizontal straight line
C. a vertical straight line
D. a circle
Answer : A

35. X-rays are
A. deflected by electric field
B. deflected by magnetic field
C. slightly deflected by electric field and magnetic field
D. not deflected by electric and magnetic fields
Answer : D

36. 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

37. The radius of curvature of a spherical mirror is
A. equal to half its focal length
B. equal to its focal length
C. twice its focal length
D. not related to its focal length
Answer : C

38. Thick brick walls are used in the construction or a cold storage because bricks
A. are good conductors of heat
B. are cheaper
C. are easily obtained
D. are bad conductors of heat
Answer : D

39. Skating on ice is possible because
A. the surface of ice is smooth
B. ice is cold
C. the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
D. the pressure on the ice due to skate raises its melting point
Answer : C

40. Electromagnets are used in
A. the telephone ear piece
B. the telegraph
C. the electric bell
D. All the above
Answer : D

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

42. A thermostat is a device used
A. for automatically maintaining a steady temperature
B. for measuring electricity
C. to reduce the voltage of electricity
D. for producing heat
Answer : A

43. 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

44. Which of the following wires of same dimensions offers least resistance to the ,flow of current?
A. copper
B. aluminium
C. silver
D. nichrome
Answer : C

45. A radio set that uses valves does not start operating immediately when it is switched on whereas a set containing only tranaistors operates immediately. The reason for this is that
A. the valve filaments have low resistance
B. valve-radio sets work at a higher voltage
C. transistor set has a low resistance
D. filaments of the valves cake time to beat up and function
Answer : D

46. A car parked in the sun with its windows closed gets terribly hot inside. This is due to
A. the heat emitted by the engine
B. the greenhouse effect
C. the good conducting power of the metal body
D. the double layered wind shield
Answer : B

47. The instrument used to measure atmospheric pressure is
A. Pyrometer
B. Eudiometer
C. Barometer
D. Hydrometer
Answer : C

48. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
A. the ringing is not loud enough
B. the glass of the bell jar absorbs the sound waves
C. the bell jar is too small
D. there is no air or -any other gas in the bell jar
Answer : D

49. 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

50. When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon Is known as
A. doppler effect
B. beats
C. resonance
D. echo
Answer : B