1000+ General Physics MCQ for RRB NTPC [Solved]

1. 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

2. A piece of cork la embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?
A. It will go down
B. It will come up
C. It will remain at the same level
D. First it will go down and it will come up
Answer : C

3. 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

4. Photoelectric cell is a device which converts
A. light energy into electrical energy
B. electrical energy into light energy
C. magnetic energy into electrical energy
D. electrical energy into mechanical energy
Answer : A

5. The light from the star nearest to the sun reaches the earth in
A. 8 minutes
B. 4.3 years
C. 12 seconds
D. 24 hours
Answer : B

6. The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is
A. Voltaic cell
B. Leclanche cell
C. Dry cell
D. An accumulator
Answer : D

7. When an electric apparatus is fitted with a three core flexible lead the insulation on the three wires is distinctively coloured. The present international convention is
A. brown for earth, yellow for live, light blue for neutral
B. green for earth, yellow for live, brown for neutral
C. yellow for earth, green for live, brown for neutral
D. brown or red for live, light blue or black for neutral and green or yellow for earth
Answer : D

8. A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps
A. the ball will travel towards the centre of the circle and fall down
B. it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
C. it will fall down at the same place where the string breaks
D. None of these
Answer : B

9. 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

10. Tea pots are highly polished
A. so that they may reflect thermal radiation from outside and minimise such radiation from them
B. so that they may absorb all radiation from outside
C. to make them attractive to look at
D. because they take high polish
Answer : A

11. Which part of the eye photographic camera?
A. Lens
B. Iris
C. Retina
D. Eyelid
Answer : D

12. 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

13. At what temperature do the Fahrenheit and Celsius scales give the same reading?
A. 212°
B. 32°
C. -40°
D. 0°
Answer : C

14. 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

15. Which of the following sets of elementary particles have nearly equal masses?
A. Neutron and Proton
B. Electron and Proton
C. Neutron and Electron
D. Proton, Neutron and Electron
Answer : A

16. 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

17. The unit of power in SI is
A. Joule
B. Newton
C. Joule/Sec
D. Erg/Sec
Answer : C

18. For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa
A. telescope
B. spectrometer
C. microscope
D. periscope
Answer : D

19. The number of galaxies that are visible without telescope on clear dark nights and away from bright lights is
A. one
B. two
C. three
D. infinite
Answer : C

20. If a body is taken from the earth to the moon
A. both its mass and weight will be different
B. its mass will be different but the weight will remain the same
C. its mass and weight will both remain unchanged
D. its mass will remain the same but weight will be different
Answer : D

21. Match the following:

A. Manometer	1. Depth of sea
B. Audiometer	2. High temperatures
C. Pyrometer	3. Level of human hearing
D. Fathometer	4. Pressure of a gas

A. A-1 B-4 C-3 D-2
B. A-4 B-3 C-1 D-2
C. A-4 B-3 C-2 D-1
D. A-3 B-4 C-1 D-2
Answer : C

22. The orbit of Venus lies between those of
A. Mercury and Earth
B. Earth and Mars
C. Mars and Saturn
D. Mars and Jupiter
Answer : A

23. 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

24. A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
A. when the moon passes between the sun and the earth
B. when the sun comes between the earth and the moon
C. when the earth comes between the sun and the moon
D. on a full moon day
Answer : A

25. A piece of ice is Boating In water kept in a beaker. When all the ice melts the level of water will
A. first rise and then fall
B. fall
C. remain the same
D. rise
Answer : C

26. On the Kelvin scale, the melting point of ice is
A. 0 K
B. 273 K
C. 373 K
D. 100 K
Answer : B

27. 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

28. The numerical reading of the Fahrenheit thermometer of a given temperature
A. is proportional to that of the Celsius thermometer
B. is always greater than that of the Celsius thermometer
C. is always less than that of the Celsius thermometer
D. may be greater than or less than or equal to that of the Celsius thermometer
Answer : D

29. 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

30. 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

31. The SI unit of electric current is
A. the ampere
B. the volt
C. the ohm
D. the coulomb
Answer : A

32. A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because
A. the floor and carpet are at different temperatures
B. the stone conveys the heat away from the feet more rapidly than the carpet
C. the carpet is a better conductor of heat than the stone
D. the human body maintains a constant temperature
Answer : B

33. The colour of the light which travels through glass with minimum speed is
A. red
B. violet
C. green
D. yellow
Answer : B

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

35. 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

36. Under similar conditions of temperature and pressure, the velocity of sound is maximum in
A. helium
B. argon
C. hydrogen
D. oxygen
Answer : C

37. Meteors
A. look like falling stars
B. are really pieces of rock or metal
C. burn up as they shoot through the air
D. All the above
Answer : D

38. Resistance is measured in
A. Volts
B. Amperes
C. ohms
D. coulombs
Answer : C

39. A small bubble of air deep down in a lake rises up to the top of the lake. The volume of the bubble on coming up will
A. increase
B. decrease
C. will not change
D. first increase and then decrease
Answer : A

40. Besides protons, the nucleus of an atom contains
A. electrons
B. neutrons
C. neutrons and electrons
D. electrons, neutrons and other particles
Answer : B

41. Photoelectric cell is a device which converts
A. light energy into electrical energy
B. electrical energy into light energy
C. magnetic energy into electrical energy
D. electrical energy into mechanical energy
Answer : A

42. A device used in a ship for the purpose of measuring the depth of the sea is
A. an altimeter
B. a fathometer
C. a hydrometer
D. a sonometer
Answer : B

43. Commonly used safety fuse wire is made of
A. Tin
B. Lead
C. Nickel
D. An alloy of tin and lead
Answer : D

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

45. A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
A. increase
B. decrease
C. remain unaffected
D. have its shape changed
Answer : A

46. 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

47. The method used to separate aluminium from a alumina is
A. electroplating
B. electrotyping
C. electrolysis
D. distillation
Answer : C

48. 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

49. When we sweat, we feel comfortable under a fan because
A. the air circulated by the fan is cool
B. the fan produces convection currents of air
C. the air circulated by the fan quickens the evaporation of the moisture on our skin
D. the air takes away the heat from our body
Answer : C

50. When a ship floats on water, the weight or water displaced is
A. an indeterminate quantity
B. equal to the weight of the ship
C. greater than the weight of the ship
D. less than the weight of the ship
Answer : B