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Practice Test - Physics 24

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Question 1

An athlete in the Olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Question 2

A uniform string of length 20 m is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is:
(take

)

Question 3

An initially parallel cylindrical beam travels in a medium of refractive index

, where μ₀ and μ₂ are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius. As the beam enters the medium, it will

Question 4

The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be

Question 5

Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion, the average time of collision between molecules increase of V^q, where V is the volume of the gas. The value of q is:

Question 6

Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature T₀, while Box B contains one mole of helium at temperature (7/3)T₀. The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature. (Ignore the heat capacity of boxes). Then, the final temperature of the gases, T_f, in terms of T₀ is

Question 7

From a solid sphere of mass M and radius R a cube of maximum possible volume is cut. Moment of inertia of cube about an axis passing through its centre and perpendicular to one of its faces is :

Question 8

A p–n junction (4) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit.

The current (I) in the resistor (R) can be shown by :

Question 9

In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45 º with the x–axis meets the experimental curve at P. The coordinates of P will be

Question 10

The bob of a simple pendulum executes Simple Harmonic Motion in water with a period t, while the period of oscillation of the bob is t₀ in air. Neglecting frictional force of water and given that the density of the bob is

kg/m³. What relationship between t and t₀ is true?

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Mar 25JEE & BITSAT