JEE Main - General Physics 1000+ MCQ [Solved] PDF Download

1. 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

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

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. 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

5. A man Jumping out of a moving train is thrown
A. forward
B. backward
C. sideways
D. None of the above
Answer : A

6. 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

7. 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

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

9. Sun spots are
A. the mountains found on the surface of the Sun
B. the dark patches on the sun having less temperature than the normal sun's surface
C. ionized gas found near the solar surface
D. the magnetic storms on the surface of the Sun
Answer : B

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

11. Lightning conductors are made of
A. iron
B. chromium
C. copper
D. steel
Answer : C

12. Bats flying in the dark avoid obstacles because
A. they can see very dearly only in darkness
B. they produce ultrasonic waves which guide them
C. their eyes are sensitive to darkness
D. their eye holes expand in darkness
Answer : B

13. 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

14. 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

15. 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

16. When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy in the form of electromagnetic wave pulses called
A. neutrons
B. electrons
C. phonons
D. photons
Answer : D

17. 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

18. The image of an object formed in a plane mirror
A. is real
B. is virtual
C. can be obtained on a screen
D. is slightly bigger than the object
Answer : B

19. A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is
A. greater than the weight of the man
B. less than the weight of the man
C. same as the weight of the man
D. zero
Answer : A

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

21. When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
A. the immersed volume of the body
B. density of the liquid
C. acceleration due to the gravity at the place
D. All the above
Answer : D

22. A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by
A. enclosing it in a thick walled iron box
B. wrapping it with an insulator
C. by placing it inside a glass case
D. by surrounding it with fine copper gauze
Answer : A

23. Which of the following has the highest refractive index?
A. Crown glass
B. Water
C. Flint glass
D. Diamond
Answer : D

24. 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

25. 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

26. Solids have definite shapes. This is because
A. the forces of cohesion of the molecules within are very much less in them
B. the forces of cohesion are very large
C. the forces of adhesion are large
D. the forces of adhesion are less
Answer : B

27. A hydraulic brake in an automobile uses
A. a fluid to transmit the braking force
B. the force applied by the driver
C. hydrogen gas and not any liquid
D. a vacuum brake
Answer : A

28. The evaporation rate depends on
A. the nature of the liquid
B. area of the exposed surface of the liquid
C. temperature of air and of the liquid
D. All the above
Answer : D

29. A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance
A. will increase
B. will decrease
C. does not change
D. varies with the increase of depth of the immersion of the iron piece
Answer : A

30. Which of the following pairs is not correct?
A. Television - Baird
B. Transistor ~ Shockley
C. Thermometer - Celsius
D. Barometer Torricelli
Answer : C

31. When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light ray diminishes alter a few reflections. This is because of
A. poor reflection from the mirrors
B. scattering of light from the mirrors
C. absorption of some light by the mirrors
D. absorption of light by the atmosphere
Answer : C

32. Which of the following is wrongly matched?
A. electric current - ampere
B. resistance - Ohm
C. electric power - volt
D. electric charge Coulomb
Answer : C

33. In a concert hall reverberation is controlled by
A. reduction of seating capacity in the hall
B. increase of sound intensity in the hall
C. lining the walls, with leather panels put on over a layer of sound absorbent glass fibre
D. by opening the doors and windows of concert hall
Answer : C

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

35. 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

36. 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

37. The ballistic missile, Agni 11, tested by India has a maximum range of
A. 1000 km
B. 1500 km
C. 2000 km
D. 500 km
Answer : C

38. 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

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

41. 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

42. The brightest star visible to the naked eye is
A. Sirius
B. Vega
C. Rigel
D. Proxima Centauri
Answer : A

43. Mercury is used in a barometer because
A. its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
B. at the ordinary temperature its vapour pressure is small
C. it is opaque and does not wet glass
D. All the above
Answer : D

44. 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

45. Which metal is used in storage batteries?
A. Copper
B. Lead
C. Tin
D. Iron
Answer : B

46. 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

47. The velocity of sound in air increases with
A. the rise of temperature
B. rise of its frequency
C. decrease in humidity
D. fall of temperature
Answer : A

48. If you want to open a door with les difficulty you push it
A. at the middle
B. at a point away from the hinge (near the rim)
C. near the hinge
D. None of the above
Answer : B

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

50. 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