1000+ General Physics Multiple Choice Question Answer [Solved]

1. Of the following which has got the highest frequency?
A. ultraviolet rays
B. gamma rays
C. radio waves
D. infrared waves
Answer : B

2. The velocity of sound in a medium is
A. directly proportional to its pressure
B. inversely proportional to the square root of its pressure
C. directly proportional to the square root of its pressure
D. independent of its pressure
Answer : D

3. 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

4. Acoustics' la a branch or study dealing with
A. historical sites
B. architecture
C. sound
D. trigonometry
Answer : C

5. The planet that moves fastest around the sun is
A. Mars
B. Venus
C. Earth
D. Mercury
Answer : D

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

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. The frequency of an ultrasonic wave is
A. the same as that of an audible sound
B. above the audible range
C. below the audible range
D. None of the above
Answer : B

9. In an oil lamp, holes are provided below the chimney so that
A. necessary oxygen for burning of oil may be provided
B. the convection current of air may be maintained to keep the lamp burning
C. the brightness of the lamp may be increased
D. All the above
Answer : D

10. Atoms which have the same atomic number but different mass numbers are called
A. isobars
B. isomers
C. isotones
D. isotopes
Answer : D

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

12. If the speed of the rotation of the earth increases the weight of a body
A. will increase
B. will decrease
C. will have no change
D. will either increase or decrease
Answer : B

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

14. The escape velocity of a satellite projected from the surface of the earth is independent of
A. the mass of earth
B. the mass of the satellite
C. the radius of the earth
D. gravitation of the earth
Answer : B

15. The red colour of the setting sun is due to
A. the least scattered red colour reaching the eye
B. the dispersion of sun light occurred in air molecule in atmosphere
C. the diffraction of sunrays in atmospheric layers
D. interference of all the rays coming from the sun
Answer : A

16. The attraction of unlike molecules at the common surface is known as
A. adhesion
B. cohesion
C. surface tension
D. capillarity
Answer : A

17. Isotones are species of atoms containing
A. same number of protons but different number of neutrons
B. same number of neutrons but different number of protons
C. the same total number of protons and neutrons
D. same number of protons and different number of electrons
Answer : B

18. A spherical mirror is
A. a reflecting elliptical portion
B. a reflecting spherical surface
C. a parabolic reflecting surface
D. a flat reflecting surface
Answer : B

19. At temperature near OK, (zero kelvin) metals such as lead and tin become
A. insulators
B. semiconductors
C. superconductors
D. condenser
Answer : C

20. In a longitudinal wave, the direction of propagation of the wave is
A. the same as the direction of the vibrations of the vibrating body
B. at right angles to the direction of the vibrations of the vibrating body
C. Both (a) and (b) above
D. None of the above
Answer : A

21. 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

22. A light year means
A. a unit of time
B. a unit of length
C. a year of no consequence
D. illumination throughout the year
Answer : B

23. One finds it more difficult to walk on ice than on a concrete road because
A. there is more friction on ice than on concrete surface
B. ice is soft and spongy while concrete is hard
C. the friction between ice and the feet is less than that between the concrete and the feet
D. None of them
Answer : C

24. An electric charge is measured in
A. coulomb
B. ampere
C. volt
D. watt
Answer : A

25. A bullet is fired at a certain angle with the horizontal. Its path will be
A. elliptical
B. a straight line
C. a parabola
D. a vertical line
Answer : C

26. 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

27. The rocket engine is motivated by jet propulsion which uses the famous
A. Kepler's Laws
B. Newtonian Third Law of Motion
C. Bernoulli's Principle
D. Law of Relativity
Answer : B

28. Where does the centre of gravity of a rubber ring lie?
A. on the outer surface
B. in the inner surface
C. at the centre of the ring
D. None of the above
Answer : C

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

30. A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by thermonuclear reactions is
A. a planet
B. a meteor
C. a star
D. a comet
Answer : C

31. 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

32. 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

33. 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

34. The rate of cooling of a hot body depends on
A. the nature of the radiating surface
B. area of the radiating surface
C. temperature difference between the body and the surroundings
D. All the above
Answer : D

35. Mica is used in an electric iron because it is a
A. good conductor of heat
B. good conductor of electricity
C. bad conductor of electricity
D. Both (a) and (b) above
Answer : C

36. 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

37. The speed of sound in a medium depends upon the properties of the medium such as
A. its density
B. its temperature
C. its elasticity
D. All the above
Answer : D

38. When ice melts, Its volume
A. decreases
B. increases
C. remains the same until all the ice has melted and then increases
D. remains the same
Answer : A

39. 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

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

41. Nuclear fusion is a process in which
A. the atoms and molecules lose their identity
B. nucleus is split into fragments
C. the nuclear reaction between two light atomic nuclei results in the formation of a heavier nucleus with release of a large quantity of nuclear energy in the process
D. absorption of neutron by a nucleus
Answer : C

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

43. 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

44. 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

45. 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

46. Red Light is used as a dancer signal because
A. it is pleasing to the eye
B. it has a traditional colour
C. it is easily distinguishable
D. it is most sensitive to the human eye
Answer : D

47. 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

48. 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

49. When one enters a dark room after being in bright light one is not able to see anything clearly for a while because
A. the retina of the eye moves forward
B. the retina of the eye moves backward
C. c).the iris is unable to dilate the pupil immediately to be able to see things
D. the eye has no power of accommodation
Answer : C

50. 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