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Practice Test - Physics 42

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Question 1

The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is :

Question 2

An electromagnetic wave in vacuum has the electric and magnetic fields and , which are always perpendicular to each other. The direction of polarization is given by and that of wave propagation by . Then

Question 3

Two spherical bodies of masses m and 5m and radii R and 2R respectively are released in free space with initial separation between their centers equal to 12R. If they attract each other due to gravitational force only then the distance covered by smaller sphere just before collisions will be –

Question 4

In the figure shown, S₁ and S₂ represent two stationary sources of sound having equal frequency, one observer is moving from A toward C with velocity V₀ then –

Question 5

The correct curve between V/T and 1/V for a gas at constant pressure is –

Question 6

The gas equation

= constant is true for a constant mass of an ideal gas undergoing –

Question 7

110 J of heat are added to a gaseous system by which internal energy increases by 40 J, the amount of work done is –

Question 8

In an isobaric process, the change in temperature for 0.1 mole of N₂ is 300K. The work done by the gas is
(given C_P – C_V = 8.3 J/mole – K)

Question 9

Two strings A and B, made of same material are stretched by same tension. The radius of string A is double of the radius of B. A transverse wave travels on A with speed v_A and on B with speed v_B. The ratio

is -

Question 10

A string of length 2x is streched by 0.1x and the velocity of transverse wave along it is v. When it is streched by 0.4x, the velocity of the wave is-

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Nov 8JEE & BITSAT