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

Two simple pendulums A and B are made to oscillate simultaneously and it is found that A completes 10 oscillations in 20 sec and B completes 8 oscillations in 10 sec. The ratio of the lengths of A and B is ____________.

A parallel beam of light is incident normally on a perfectly absorbing surface. If the force exerted by the light beam on the surface is 2 x 10^-7 N in 10 nanoseconds, the energy of photons hitting the surface is ____________.

A railway engine whistling at a constant frequency moves with a constant speed aixi it goes past a stationary observer standing beside the railway track. Then the frequency of (n') of the sound heard by the observer with respect to time (t) can be best represented by which of the following curve?

A pipe open at both ends and a pipe closed at one end have same length. The ratio of frequencies of their p^th overtone is ______.

lf the current flowing in a circular loop is in clockwise direction, then the magnetic induction will be ____________.

The fundamental frequency of sonometer wire increases by 9 Hz, if its tension is increased by 69%, keeping the length constant. The frequency of the wire is ______.

At what frequency (approximate) will the inductive reactance of 4 H inductance be equal to the capacitive reactance of 4 µF capacitance?

A person measures a time period of a simple pendulum inside a stationary lift and finds it to be T. If the lift starts accelerating upwards with an acceleration `("g"/3)`, the time period of the pendulum will be ______.

The number of photons falling per second on a completely darkened plate to produce a force of 6.62 x 10^-5 N is 'n'. If the wavelength of the light falling is 5 x 10^-7 m, then n = ____________ x 10²². (h = 6.62 x 10^-34 J-s)

The magnetic induction at the centre of a coil made from a wire of length 44 m carrying a current of 0.5 A is nearly ____________.

A wire of length L carrying a current I is bent into a circle. The magnitude of the magnetic field at the centre of the circle is ____________.

Surface tension of a liquid is numerically equal to ______.

A source of sound is moving with constant velocity of 30 mis emitting a note of frequency 256 Hz. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is ______. (speed of sound in air = 330 m/s)

A bus is moving with a velocity of 5 m is towards a wall. The driver blows the horn of frequency 165 Hz. If the speed of sound in air is 335 m is, then after reflection of sound wave, the number of beats per second heard by the passengers in the bus will be ______.

The molar specific heats of an ideal gas at constant pressure and constant volume are denoted by C_p and C_v respectively. If `gamma = "C"_"p"/"C"_"v"` and R is the universal gas constant, then Cp is equal to ______.

A monoatomic gas of pressure 'P' having volume 'V' expands isothermally to a volume '2V' and then adiabatically to a volume '16V'. The final pressure of the gas is ______.
(ratio of specific heats = `5/3`)

The value of 'γ' for a gas is given as `gamma = 1 + 2/"f"`, where 'f ' is the number of degrees of freedom of freedom of a molecule of a gas. What is the ratio of `gamma_"monoatonic"//gamma_"diatomic"`?
Diatomic gas consists of rigid gas molecules

Heat is applied to a rigid diatomic gas at constant pressure. The ratio ΔQ : ΔU : ΔW is ______.

At same temperature and pressure of an ideal gas, ____________.

The current in coil changes from 0.6 A to 3 A in 0.06 s inducing a voltage of 8 V across it. Find initial energy stored in the coil.