Physics Practice MCQ Page 35
Multiple Choice questions for Physics in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 3729 The SI unit of thermal conductivity is
- K cal sec-1 metre-1 K-1
- cal sec-1 metre-1 K-1
- watt metre-1 K-1
- none of these
Question: 3730 A metal pendulum is attached to a clock. The clock keeps correct time at 20°C. At 40 °C, the clock
- gains time
- loses time
- keeps correct time
- none of these
Question: 3731 When a sound wave passes through a medium, the maximum velocity of a particle of the medium through which the wave passes is given by
- frequency × amplitude
- frequency/ 2π × amplitude
- 2π × amplitude
- (frequency)2 × amplitude
Question: 3732 Two particles are executing S.H.M. of same period, T, if the second particle starts from its mean position T/2 later than the first, the phase difference between the two particles at any instant of time is
- π/2
- π
- 2π/2
- 2π
Question: 3733 A particle of mass 5 gm makes 35 oscillations of 11s, with an amplitude of 8 cm. What is its enrgy?
- 0.0064 joule
- 0.64 joule
- 0.08 joule
- 0.8 joule
Question: 3734 A disc with equally spaced holes round the edge is rotated at a constant speed. A jet of air is directed onto the hole and a musical note is heard. The pitch of this note can be lowered provided
- the pressure of air jet is decreased
- the hoes are made smaller
- jet of a denser gas than air is used
- the speed of rotation is decreased
Question: 3747 Assertion (A): Diffraction of sound waves is more evident in daily experience than that of light waves.
Reason (R): sound waves are longitudinal, while light waves are transverse.
- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct by R is not the correct explanation of A
- A is correct, but r is incorrect
- A is incorrect but R is correct
Question: 3748 If a source of sound producing a note frequency n is moving towards a stationary observer with a speeds, then the apparent pitch is given by
- n1 = n (v+s/v)
- n1 = n(v-s/v)
- n1 = n(v/v-s)
Question: 3749 When a tuning fork is made to vibrate, rays from a point object to its real point image through a converging lens are such that
- path for paraxial rays are shorter than the path for marginal rays
- path for paraxial rays are longer than marginal rays
- they are equal for all rays through the lens.
- the equality or otherwise will depend on the focal length of the lens.
Question: 3750 When the mass of a string is increased to four times its orignial value, the velocity of the waves is
- doubled
- reduced to one half
- reduced to one fourth
- increased to four times its original value
Question: 3751 Spherical aberration is minimised when two plano-convex lenses are separated by a distance equal to
- 2d
- d
- d/2
- d/4
Question: 3752 When tuning fork is made to vibrate, vibrations of its two prongs
- are in phase
- have a phase difference of π
- have a phase difference of π/2
- have a phase difference of π/4
Answers to the questions of Physics on this page
Following list gives the correct choice for the answer of the Physics mcqs.
3729 . C
3730 . B
3731 . C
3732 . B
3733 . A
3734 . D
3747 . B
3748 . A
3749 . B
3750 . B
3751 . B
3752 . A
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MCQ for Practicing Subject Tests