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

The resistances in left and right gap of a meter-bridge are 3 `Omega` and 5 `Omega` respectively. When the resistance in the left gap is increased by 10%, the balance point shifts nearly by ______.

The current through 1 `Omega` resistance in the following circuit is ______. 

The equation of wave motion is `y = 6 sin[12pit-0.02pix+pi/2],` where x is in m and t in second. The velocity of the wave is ______.

When an unknown resistance 'X' is connected in the left gap of a meter bridge and a known resistance 'R' in the right gap, a null point is obtained at 40 cm from the left end. If a 2 Ω resistance is connected in series with 'X' the null point shifts towards the right by 10 cm, with some resistance in the right gap. The value of 'X' must be ______

In a Wheatstone's bridge, the resistance in the three arms are P, Q, R, and its fourth arm has a parallel combination of two resistances S₁ and S₂, The balancing condition of the bridge is ______ 

The magnetic moment produced in a substance of mass 5 gram is 6 x 10^-7 Am² If its density is 5 g/cm³, then intensity of magnetization in `"A"/"m"` will be ____________.

A cell having an emf E and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by ______.

A ball is projected with kinetic energy E, at an angle of 60° to the horizontal. The kinetic energy of this ball at the highest point of its flight will become ______.

The displacement-time graphs of two particles A and B are straight lines making angles of 30° and 60° respectively with the time axis. If the velocity of A is v_A and that of B is v_B, the value of v_A/v_B is ______.

The wavelength of two waves are 50 and 51 cm respectively. If the temperature of the room is 20°C then what will be the number of beats produced per second by these waves, when the speed of sound at 0°C is 332 m/s?

The width of a slit is 0.012 mm. Monochromatic light is incident on it. The angular position of first bright line is 5.2°. The wavelength of incident light is ______. [sin 5.2° = 0.0906].

In communication system, the process of superimposing a low frequency signal on a high frequency wave is known as ______.

A bar magnet has length 3 cm, cross-sectional area 2 cm³ and magnetic moment 3 Am². The intensity of magnetisation of bar magnet is ______.

A resistance of 20 Ω is connected in the left gap of a meter bridge and an unknown resistance greater than 20 Ω is connected in the right gap. When these resistances are interchanged, the balance point shifts by 20 cm. The unknown resistance is ______.

For an insulator, the forbidden energy gap is ______.

A source of 300 Hz frequency, an observer and a wind are moving as shown in the figure with respect to the ground. The frequency heard by observation is ______.

(Take, the speed of sound in air = 340 m/s)

Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1%, 3 beats are produced in 2 s. The initial frequency of vibration of each wire is ______.

An astronaut is approaching the moon. He sends out a radio signal of frequency 5000 MHz and the frequency of echo is different from that of the original frequency by 100 kHz. His velocity of approach wrt, to the moon, is ______.

Transverse waves are generated in two steel wires A and B with a source of 512 Hz. If their diameters are in the ratio 2 : 1 and tensions are in the ratio 2 : 1, the velocities of the waves are in the ratio (wires A and B) ______.

A progressive wave of frequency 500 Hz is travelling with a velocity of 360 m/s. How far apart are two points 60° out of phase?