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

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

A hot body at a temperature 'T' is kept in a surrounding of temperature 'T₀'. It takes time 't₁' to cool from 'T' to 'T₂', time t₂ to cool from 'T₂' to 'T₃' and time 't₃' to cool from 'T₃' to 'T₄'. If (T - T₂) = (T₂ - T₃) = (T₃ - T₄), then ______.

L-C-R series circuit contains a resistance of 10 Ω and self-inductance 0.4 H connected in series with variable capacitor across 60 V and 50 Hz supply. The value of capacity at resonance will be π² = 10.

An A.C. generator produced an output voltage e = 170 sin 327t volt, where t is in seconds. The frequency of A.C. voltage is nearly ____________.

Assuming the expression for the pressure exerted by the gas on the wall of the container, it can be shown that pressure is ______.

A molecule consists of two atoms each of mass 'm' and separated by a distance 'd'. At room temperature the average rotational kinetic energy is 'E', then its angular frequency is ______.

A metal rod of cross-sectional area 3 × 10^-6 m² is suspended vertically from one end has a length 0.4 m at 100°C. Now the rod is cooled upto 0°C, but prevented from contracting by attaching a mass 'm' at the lower end. The value of 'm' is ______.

(Y = 10¹¹ N/m², coefficient of linear expansion = 10^-5/K, g = 10m/s²)

A metal rod of length Land cross-sectional area A is heated through T °C. What is the force required to prevent the expansion of the rod lengthwise?

(Y = Young's modulus of material of the rod, α = coefficient of linear expansion of the rod.)

The average translational kinetic energy of a molecule in a gas is 'E₁'. The kinetic energy of the electron (e) accelerated from rest through p.d. 'V' volt is 'E₂'. The temperature at which E₁ = E₂ is possible, is ______.

An alternating e.m.f. of 0.2 V is applied across an LCR series circuit having R = 4 `Omega`, C = 80 µF and L = 200 mH. At resonance the voltage drop across the inductor is ____________.

In series 'LR' circuit and in series 'RC' circuit, same current is flowing. If the frequency of e.m.f. of a.c. is increased for both the circuits, the impedance will ____________.

In series LCR circuit, resistance is 18 `Omega` and impedance is 33 `Omega`. An r.m.s. voltage of 220 V is applied across the circuit. The true power consumed in a.c. circuit is ____________.

In LCR series circuit, an alternating e.m.f. 'e' and current 'i' are given by the equations e = 100 sin (100 t) volt,

`"i" = 100  "sin" (100"t" + pi/3)"mA"`.

The average power dissipated in the circuit will be ____________.

When unpolarised light is passed through crossed polaroids, then light passing through the first polaroid ______

An e.m.f. E = E₀ sin `omega`t is applied to a circuit containing 'L' and 'R' in series. If X_L = R, then the power dissipated in the circuit is ____________.

The voltage gain of a CE amplifier is 50. A sinusoidal ac of amplitude 10 mV is applied as a signal. The output of the amplifier will be ______.

The volume of a metal block changes by 0.86% when heated through 200 °C then its coefficient of cubical expansion is ______.

The angle of polarization for a medium is 60°. The critical angle for this will be ______
`(tan 60^circ = sqrt3)`

The Q-value of a nuclear reaction and kinetic energy of the projectile particle, K_P are related as ______.

In a series LR circuit X_L = R and power factor of the circuit is P₁. When capacitor with capacitance C such that X_L= X_C is put in series, the power factor becomes P₂. The ratio `"P"_1/"P"_2` is ______.