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Practice Test - Physics 43

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Question 1

A racing car moving towards a cliff sounds its horn. The driver observed that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If V = the velocity of sound, the velocity of the car is-

Question 2

A standing wave is produced on a string clamped at one end and free at the other. The length of the string -

Question 3

The critical angle for total internal reflection of light going from medium I to medium II is given by the relation tan iC = 5/9. The refractive index of the Imedium with respect to the medium IIis -

Question 4

Two thin converging lenses of same focal length = f are placed on a common axis so that the centre of one coincides with the focus of the other. An object is placed at a distance twice the focal length from left hand lens. What is the lateral magnification?

Question 5

A tank full of water has a small hole at its bottom. Let t1 be the time taken to empty first half of the tank and t2 be the time needed to empty rest half of the tank, then–

Question 6

A cork is submerged in water by a spring attached to the bottom of a bowl. When the bowl is kept in an elevator moving with acceleration downwards, the length of spring–

Question 7

Mass is non uniformly distributed over the rod of length ‘η’. Its linear mass density varies linearly with length as η = kx. The position of centre of mass is given by–

Question 8

A monkey of mass 20 kg rides on a 40 kg trolley moving with constant speed of 8 m/s along a horizontal track. If the monkey jumps vertically to grab the overhanging branch of a tree, the speed (in m/s) of the trolley in the horizontal direction after the monkey has jumped off is -

Question 9

According to the first law of thermodynamics ΔQ = dU + ΔW, in an isochoric process –

Question 10

The internal energy of a gas is given by U = 2PV. It expands from V0 to 2V0 against a constant pressure P0. The heat absorbed by the gas in the process is
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Dec 10JEE & BITSAT