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

A change of 9.0 mA in the emitter current brings a change of 8.9 mA in the collector current. The value of current gain β will be ______.

A transistor is connected in C - E mode. If collector current is 72 × 10^-5 A and α = 0.96, then base current will be ______.

Two resistances prepared from the wire of the same material having diameters in the ratio 2 : 1 and lengths in the ratio 2 : 1 are connected in the left gap and right gap of Wheatstone's meter bridge respectively. The distance of the null point from the left end of the wire is ______ 

When the observer moves towards a stationary source with velocity V₁, the apparent frequency of emitted note is F₁. When observer moves away from the source with velocity V₁, the apparent frequency is F₂. If V is the velocity of sound in air and `"F"_1/"F"_2=2` then `"V"/"V"_1` is equal to ______.

In the meter bridge experiment, the null point is obtained at a distance of ℓ from the left end. The resistance in the left and right gaps are halved and then interchanged. The new position of the null point is at ______

In a balanced metre bridge, 5 Ω is connected in the left gap and R Ω in the right gap. When R Ω is shunted with equal resistance, the new balance point is at 1.6 I₁ where 'I₁' is the earlier balancing length. The value of 'I₁' is ______ 

In the meter bridge experiment, a null point was obtained at a distance of ℓ from the left end. The values of resistances in the left and right gaps are doubled and then interchanged. The new position of a null point is ______

In a meter bridge experiment, to minimize an error due to contact resistance, ______  

An electron is projected along the axis of circular conductor carrying current I. Electron will experience ____________.

The variation of intensity of magnetization (I) and applied magnetic field intensity (H) for three magnetic materials A, B, C are shown in the graph. The material A is ____________.

Find the intensity of magnetization of a magnet of moment 4 Am² which weighs 50 gram. (Density of the material of a magnet = 5000 kg/m³)

In a metre bridge experiment, the ratio of the left-gap resistance to right gap resistance is 2: 3. The balance point from the left is ______.

Magnetization of a sample is ______.

ln, a Wheatstone network, P = Q = R = 8 `Omega` and S is 10 `Omega`. The required resistance to be connected to S so that network is balanced is ______.

A bar magnet has length 3 cm, cross-sectional area 4 cm^2, and magnetic moment 6 Am². The intensity of magnetisation of bar magnet is ______.

A transverse wave of amplitude 0.05 m and frequency 250 Hz is travelling along a stretched string with a speed of 100 m/s. What would be the displacement of a particle at a distance 1.1 m origin after 0.02 second?

`[sin  pi/2=1,  cos  pi/2=0]`

For an ideal diode, the current in the following arrangement is ______.

In common emitter amplifier, a change of 0.2 mA in the base current causes a change of 5 mA in the collector current. If input resistance is 2K `Omega` and voltage gain is 75, the load resistance used in the circuit is ______.

In a study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98. The collector current is 3mA, then base current will be approximately ______.

Two parallel conducting wires of equal lengths placed distance 'd' apart carry currents 'I₁' and 'I₂' respectively in opposite directions. The resultant magnetic field at the midpoint of both the wires is ______.

(µ₀ = permeability of free space.)