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Practice Test - Physics 12

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Question 1

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement x is proportional to

Question 2

A car sounding its horn at 480 Hz moves towards a cliff at 20 m/s. The driver of the car hears (velocity of sound = 320 m/s)

Question 3

In Young’s double slit experiment when wavelength used is 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm apart. What is the distance (in cm) between the slits?

Question 4

A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats γ. It is moving with speed v and is suddenly brought to rest. Assuming no heat is lost to the surroundings, its temperature increases by

Question 5

A cylindrical metal rod of length L₀ is shaped into a ring with a small gap as shown in figure. On heating the system.

Question 6

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is

Question 7

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

Question 8

Let the x – z plane be the boundary between two transparent media. Medium 1 in z ≥ 0 has a refractive index of

and medium 2 with z < 0 has a refractive index of

. A ray of light in medium 1 given by the vector

is incident on the plane of separation. The angle of refraction in medium 2 is

Question 9

The displacement of a particle varies according to the relation x = 4(cos πt + sin πt). the amplitude of the particle is

Question 10

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque needed to maintain the needle in this position will be

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Oct 17JEE & BITSAT