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

A body sends waves 100 mm long through medium P and 0.25 m long in medium Q. If the velocity of the wave in medium P is 80 cms^-1. The velocity of the wave in medium Q is ______.

A uniform ring of mass M and radius r is placed directly above a uniform sphere of mass 8M and of same radius R. The centre of the ring is at a distance of d = `sqrt3​`R from the centre of the sphere. The gravitational attraction between the sphere and the ring is ______.

The speed of sound in a mixture of 1 mole of He and 2 mole of oxygen at 27°C is ______.

The mass of a spaceship is 1000 kg. It is to be launched from the earth's surface out into free space. The value of g and R are 10 m/s² and 6400 km, respectively. The required energy for this work will be ______.

A ray of light AO in a vacuum is incident on a glass slab at an angle of 60° and refracted at an angle of 30° along OB as shown in the figure. The optical path length of the light ray from A to B is ______.

The equation of a wave travelling on a stretched string is y = 4 sin 2π `("t"/0.02-"x"/100)`, here x and y are in cm and t is in second. The speed of wave is ______.

A coil of n turns and resistance R Ω is connected in series with a resistance `"R"/2`. The combination is moved for time t second through magnetic flux ϕ₁ to ϕ₂, The induced current in the circuit is ______.

The energy in the superposition of waves ____________.

When the magnetic dipole is rotated through angle `theta`, work done in rotating dipole is given by -mB cos `theta`. Now, a magnetic needle lying parallel to a magnetic field requires W units of work to tum it through 60°. What will be the value of torque needed to maintain the needle in same position?

What is the ratio of the charges of two conducting spheres of radii r₁ and r₂ which have equal surface charge density?

Critical angle of light passing from glass to air is maximum for ____________.

Work done during the process of charging a conductor is stored in the form of electrostatic energy and is given by ____________.

Six very long insulated copper wires are bound together to form a cable. The currents carried by the wires are I₁ = +10 A, I₂ = -12 A, I₃ = +10A, I₄ = +8 A, I₅ = -11 A and I₆ = 19 A. The magnetic induction at a perpendicular distance of 20 cm from the cable is ______.

The electrostatic potential inside a charged sphere is given as V = Ar² + B, where r is the distance from the centre of the sphere; A and B are constants. Then the charge density in the sphere is ______.

The resultant `vec"R"` of `vec"P"` and `vec"Q"` is perpendicular to `vec"P"`. Also `|vec"P"|=|vec"R"|`. The angle between `vec"P"` and `vec"Q"` is ______.
[tan 45° = 1]

If `sqrt("A"^2+"B"^2)` represents the magnitude of resultant of two vectors `(vec"A" + vec"B")` and `(vec"A" - vec"B")`, then the angle between two vectors is ______.

A spherical conductor of radius 10 cm has a charge of 3.2 x 10^-7 C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere?

`(1/(4 pi epsilon_0) = 9 xx 10^9 "Nm"^2 // "C"^2)`

The stopping potential of the photoelectrons, from a photo cell is ______.

In case of dimensions of electric field and electric dipole moment the power of mass is respectively.

A green light is incident from the water to the air-water interface at the critical angle (C). Select the correct statement.