List of top Physics Questions asked in MHT CET

A transverse wave is travelling with velocity \( V \) through a metal wire of length \( L \) and density \( \rho \). The tensile stress in the wire is
The length of potentiometer wire is 4m and is connected in series with an accumulator. The e.m.f. (unknown) of a cell balances against 1.5 m length of wire. If the length of potentiometer wire is doubled, then the new balancing length of wire will be
The value of current \( I \) in the given current distribution is
In experiment of photoelectric effect, the stopping potential for a given metal is \( V_0 \) volt, when radiation of wavelength \( \lambda_0 \) is used. If radiation of wavelength \( 2\lambda_0 \) is used for the same metal, then the stopping potential (in volts) will be
A metal sphere of mass \( m \) and density \( \sigma_1 \) falls with terminal velocity through a container containing liquid. The density of liquid is \( \sigma_2 \). The viscous force acting on the sphere is
In common emitter mode of transistor, the d.c. current gain is 20, the emitter current is 7 mA. The collector current is
The equation of vibration of a stretched string fixed at both ends and vibrating in 5th harmonic is \( Y = 3 \sin(0.4x) \cos(200\pi t) \), where \( x \) and \( Y \) are in cm and \( t \) in seconds. The length of the string is
A particle performs S.H.M. Its potential energies are \( U_1 \) and \( U_2 \) at displacements \( x_1 \) and \( x_2 \) respectively. At displacement \( x_1 + x_2 \), its potential energy \( U \) is
In hydrogen spectrum, which of the following spectral series lies in ultraviolet region?
If \( \mathbf{A} = \hat{i} + 12 \hat{j} + \hat{k} \) and \( \mathbf{B} = 2\hat{i} - a\hat{j} + \hat{k} \) are perpendicular to each other, then what will be the value of \( a \)?
For any two vectors \( \mathbf{A} \) and \( \mathbf{B} \) if \( \mathbf{A} \cdot \mathbf{B} = |\mathbf{A}| |\mathbf{B}| \cos \theta \), the magnitude of \( (\mathbf{A} + \mathbf{B}) \) is (given \( \tan \theta = 1 \), \( \cos \theta = \frac{1}{\sqrt{2}} \))
The acceleration due to gravity on moon is \( \frac{1}{6} \)th times the acceleration due to gravity on earth. If the ratio of the density of earth \( \rho_e \) to the density of moon \( \rho_m \) is \( \frac{5}{3} \), then the radius of moon \( R_m \) in terms of the radius of earth \( R_e \) is
A resonance tube completely filled with water has a small hole at the bottom. Length of the tube is 80 cm. A vibrating tuning fork of frequency 500 Hz is held near the open end of the tube. Water is slowly removed from the bottom. The maximum number of resonances heard will be (neglect end correction). Speed of sound in air is 340 m/s
If \( \Delta Q \) is the amount of heat supplied to \( n \) moles of a diatomic gas at constant pressure, \( \Delta U \) is the change in internal energy and \( \Delta W \) is the work done, then \( \Delta W : \Delta U : \Delta Q \) is
Water rises to height 2.2 cm in glass capillary tube. The height to which same water rises in another capillary having \( \frac{1}{4} \)th area of cross-section is
The relative angular speed of hour hand and second hand of a clock is
The electron in hydrogen atom is moving in an orbit of radius 0.53 Å. It takes \( 1.571 \times 10^{-16} \, \text{s} \) to complete one revolution. The velocity of electron will be
The width of the depletion layer of a p-n junction diode, when it is (i) forward biased and (ii) reverse biased respectively
A series LCR circuit has \( R = 200 \, \Omega \), \( L = 663 \, \text{mH} \), and \( C = 265 \, \mu\text{F} \). The applied alternating voltage has an amplitude of 50 V and a frequency of 60 Hz so that \( X_L = 250 \, \Omega \) and \( X_C = 100 \, \Omega \). The peak current is
If the frequency of incident radiation is kept constant and the experiment is repeated by using incident light of different intensities, then stopping potential (\( V_s \))
A thin, uniform metal rod of mass \( M \) and length \( L \) is swinging about a horizontal axis passing through its end. Its maximum angular velocity is \( \omega \). Its centre of mass rises to a maximum height of \( \frac{L^2 \omega^2}{6g} \). (where \( g \) is the acceleration due to gravity)
Two masses of 1 gram and 4 gram are moving with equal kinetic energy. The ratio of the magnitudes of their momenta is
A metal sphere of radius 1 m is charged with \( 10^{-2} \) C in air. Its bulk modulus is \( \frac{10^{11}}{4\pi^2} \). The volume strain in the sphere is \( \epsilon_0 \) (permittivity of free space)
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
Light waves from two coherent sources arrive at two points on a screen with path difference of zero and \( \lambda / 2 \). The ratio of the intensities at the points is