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

Transverse waves of the same frequency are generated in two steel wires A and B. The diameter of A is twice that of B and the tension in A is half that in B. The ratio of the velocities of waves in A and B is ____________.

A pendulum performs S.H.M. with period `sqrt3` second in a stationary lift. If lift moves up with acceleration `"g"/3`, the period of pendulum is ______. (g = acceleration due to gravity)

A simple pendulum has length 'L₁'. When its amplitude is 'a' cm, its energy is 'E₁'. When length is 2L₁, its energy is 'E₂' Amplitude is same for both the lengths The relation between E₁ and E₂ is ______.

Length of an organ pipe open at both ends is 34 cm. If velocity of sound is 340 m is, then the frequency of 2^nd overtone is ______.

A transverse wave propagating along the string is y = 0.3 sin (x + 20t) where x, y are in metre and t in second. The linear density of the string is 1.2 x 10^-4 kg/m. The tension in the string is ______.

A stretched uniform wire of length L under tension T is vibrating with frequency 'n' . A closed pipe of same length is also vibrating with same fundamental frequency 'n'. If T is increased by 16 N, it is in resonance with 2^nd harmonic of same closed pipe. The initial tension in the wire is ______.

An organ pipe has fundamental frequency 100 Hz. If its one end is closed, the frequencies produced will be ______.

According to de Broglie, wave is associated with matter ____________.

A parallel combination of pure inductor and capacitor is connected across a source of alternating e.m.f. 'e'. The currents flowing through an inductor and capacitor are i_L and i_C respectively. In this parallel resonant circuit, the condition for currents i, i_L and i_C is (i = net r.m.s. current in the circuit)

Out of the following graphs which graph shows the correct relation for LC parallel resonant circuit?

An observer moves towards a stationary source of sound with a velocity one-fifth of the velocity of sound. The percentage increase in the apparent frequency heard by the observer will be ______.

In rejector circuit, above resonant frequency the circuit is ____________.

A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air colunm in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s.

Two protons are kept at a separation of 10 nm. Let F_n and F_e be the nuclear force and the electromagnetic force between them ____________.

If we study the vibration of a pipe open at both ends, then which of the following statements is not true?

The radius of germanium (Ge) nuclide is measured to be twice the radius of  `""^9""_4"Be"`. The number of nucleons in Ge will be ____________.

For a gas `"R"/"C"_"v" = 0.4,` where 'R' is the universal gas constant and 'C_v' is molar specific heat at constant volume. The gas is made up of molecules which are ______.

In series resonant circuit, at resonance, ____________.

The simplest mode of a vibration of the string is called ____________.

The pitch of the whistle of an engine appears to drop to`(5/6)^"th"` of original value when it passes a stationary observer. If the speed of sound in air is 350 m/s then the speed of engine is ____________.