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

Find the wrong statement from the following about the equation of stationary wave given by Y = 0.04 cos(πx) sin(50 πt) m where t is in second. Then for the stationary wave.

Three masses 700 g, 500 g, and 400 g are suspended at the end of a spring and are in equilibrium as shown in figure. When the 700 g mass is removed, the system oscillates with a period of 3 seconds; when the 500 g mass is also removed, it will oscillate with a period of ____________.

In Balmer series, wavelength of first line is 'λ₁' and in Brackett series wavelength of first line is 'λ₂' then `lambda_1/lambda_2` is ______.

A stretched string of 1 m length and mass 5 x 10^-4 kg is having tension of 20 N. If it is plucked at 25 cm from one end then it will vibrate with frequency ____________.

The resistance of the potentiometer wire should ideally be ____________.

For the stationary wave,

y = 8sin(6.25πx) cos(96πt) metre, the distance between a node and the next antinode is ____________.

A container has a mixture of two gases, hydrogen, and oxygen at room temperature. Which one of the following statements is true, if V_H and V_O are the root mean square velocities of hydrogen and oxygen molecules respectively?

In a potentiometer experiment, when the galvanometer shows no deflection, then no current flows through ____________.

The potentiometer is more sensitive, when ______.

For stationary waves in the medium, ____________.

The resistivity of potentiometer wire is 40 × 10^-8 ohm - metre and its area of cross-section is 8 × 10^-6 m². If 0.2 ampere current is flowing through the wire, the potential gradient of the wire is ______.

A potentiometer is an ideal device for measuring potential difference because ______.

In the figure below, D and E respectively represent

The equation of S.H.M. of a particle of amplitude 4 cm performing 150 oscillations per minute starting with an initial phase 30° is ____________.

Select the WRONG statement:

Electronic configuration of germanium is 2, 8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added. The correct statement is ____________.

Two cells when connected in series are balanced on 8 m on a potentiometer. If the cells are connected with polarities of one of the cell reversed, they balance on 2 m. The ratio of e.m.f's of the two cells is ____________.

Glass has refractive index μ with respect to air and the critical angle for a ray of light going from glass to air is θ. If a ray of light is incident from air on the glass with angle of incidence θ corresponding angle of refraction is ______.

The refractive index of the material of crystal is 1.68 and that of castor oil is 1.2. When a ray of light passes from oil to glass, its velocity will change by a factor ______.

A potentiometer wire has length L For given cell of emf E, the balancing length is `"L"/3` from 3 the positive end of the wire. If the length of the potentiometer wire is increased by 50%, then for the same cell, the balance point is obtained at length.