MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio `("I"_"max" - "I"_"min")/("I"_"max" + "I"_"min")` will be ______

An obstacle is moving towards the source with velocity v. The sound is reflected from the obstacle. If c is the speed of sound and A. is the wavelength, then the wavelength of the reflected wave λ_r is

A block of mass m is moving on rough horizontal surface with momentum p. The coefficient of friction between the block and surface is µ. The distance covered by the block before it stops is [g =acceleration due to gravity)

The mass of the moon is `1/81` of the mass of the earth. Its diameter is `1/3.7` of that of the earth. If acceleration due to gravity on the surface of the earth is 9.8 m/s², then the acceleration due to gravity on the surface of the moon.

In Young's double-slit experiment, if the width of the 2^nd bright fringe is 4 x 10^-2 cm, then the width of the 4^th bright fringe will be ______ cm.

A wave is represented by the equation, y = A sin (10 πx + 15 πt + π/3) where x is in metre and t are in second. Which of the following statements is correct?

A vehicle of mass m is moving with momentum p on a rough horizontal road. The coefficient of friction between the tyres and the horizontal road is µ. The stopping distance is ____________.

(g = acceleration due to gravity)

In Young's double slit experiment green light is incident on the two slits. The interference pattern is observed on a screen. Which one of the following changes would cause the observed fringes to be more closely spaced?

In Young's double-slit experiment, in an interference pattern, a second minimum is observed exactly in front of one slit. The distance between the two coherent sources is 'd' and the distance between source and screen is 'D'. The wavelength of the light source used is ______

A graph is plotted between the fringe-width Z and the distance D between the slit and eye-piece, keeping other adjustment same. The correct graph is

A.	B.
C.	D.

At a certain instant, a stationary transverse wave is found to have maximum kinetic energy. The appearance of string at that instant is ____________.

For a body moving with constant speed in a horizontal circle, which of the following remains constant?

A metal rod has length, cross-sectional area and Young's modulus as L, A and Y, respectively. If the elongation in the rod produced is l, then work done is proportional to ______.

The ratio of densities of nitrogen and oxygen is 14:16. The temperature at which the speed of sound in nitrogen will be the same as that in oxygen at 79°C is ______

If the monochromatic source in Young's double slit experiment is white light, then ____________.

A thin transparent sheet is placed in front of a slit in Young's double slit experiment. The fringe width will ____________.

The light waves from two independent monochromatic light sources are given by, y₁ = 2 sin ωt and y₂ = 3 cos ωt. Then the correct statement is ____________.

On a rainy day, a small oil film on water shows brilliant colours. This is due to ____________.

Band width for red light of wavelength 6600 Å is 0.42 mm. If red Light is replaced by blue light of wavelength 4400 Å, then the change m bandwidth will be ____________.

The distance between the first and ninth bright fringes formed in a biprism experiment is ______.

(`lambda` = 6000 A, D = 1.0 m, d = 1.2 mm)