List of top Physics Questions asked in MHT CET

Choose the correct statement. In semiconductors, the valence band and conduction band are
The relative permeability of iron is 2000. Its absolute permeability in SI unit will be [$\frac{\mu_0}{4\pi} = 10^{-7}\text{ T}\cdot\text{m}\cdot\text{A}^{-1}$]
A step-down transformer has a turns ratio of $20 : 1$. If $8\text{ V}$ is applied across a $0.4\ \Omega$ secondary load, then the primary current will be
If two sources emit light waves of different amplitudes then
An ideal gas at $27^\circ\text{C}$ is compressed adiabatically to $\left(\frac{8}{27}\right)$ of its original volume. If the ratio of specific heats, $\gamma = \frac{5}{3}$ then the rise in temperature of the gas is
Two particles $A$ and $B$ having same mass have charge $+q$ and $+4q$ respectively. When they are allowed to fall from rest through same electric potential difference, the ratio of their speeds $V_A$ to $V_B$ will become
'n' waves are produced on a string in 1 second. When the radius of the string is doubled, keeping tension same, the number of waves produced in 1 second for the same harmonic will be
If '$E$' and '$L$' denote the magnitude of total energy and angular momentum of a revolving electron in the $n^{\text{th}}$ Bohr orbit, then
The magnetic flux (in weber) in a closed circuit of resistance $20\ \Omega$ varies with time $t$ second according to equation $\phi = 5t^2 - 6t + 9$. The magnitude of induced current at $t = 0.2$ second is
The magnetic field inside a current carrying toroidal solenoid is $0.2\text{ mT}$. What is the magnetic field inside the toroid if the current through it is tripled and the cross-sectional radius is made $\frac{1}{3}^{\text{rd}}$?
A body of mass '$m$' performs linear S.H.M. given by the equation $x = P \sin \omega t + Q \sin \left(\omega t + \frac{\pi}{2}\right)$. The total energy of the particle at any instant is
A step-down transformer is used to reduce the main supply from $V_1$ volt to $V_2$ volt. The primary coil draws a current $I_1$ A and the secondary coil draws $I_2$ A ($I_1 \lt I_2$). The ratio of input power to output power is
At a height 'R' above the earth's surface the gravitational acceleration is (R = radius of earth, g = acceleration due to gravity on earth's surface)
A parallel plate capacitor having plates of radius $6\text{ cm}$ has capacitance $100\text{ pF}$. It is connected to $230\text{ V}$ a.c. supply with angular frequency $300\text{ rad/s}$. The r.m.s. value of current is
Two rings of radius 'R' and 'nR' made of same material have the ratio of moment of inertia about an axis passing through its centre and perpendicular to the plane is $1 : 8$. The value of 'n' is (mass per unit length = $\lambda$)
For the circuit shown below, instantaneous current through inductor '$L$' and capacitor '$C$' is respectively
The critical angle for light going from medium '$x$' to medium '$Y$' is $\theta$. The speed of light in medium '$x$' is $v$. The speed of light in medium '$Y$' is
If the pressure of an ideal gas is decreased by 10% isothermally, then its volume will
An object is located on a wall, its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance '$d$' in front of the second wall. The required focal length of the lens is
A driver applies the brakes on seeing the red traffic signal $400\text{ m}$ ahead. At the time of applying the brakes, the vehicle was moving with a speed of $54\text{ km/h}$ and retards uniformly at $0.3\text{ m/s}^2$. The distance of the vehicle from the traffic signal when it stops is
A child is standing with folded hands at the centre of the platform rotating about its central axis. The kinetic energy of the system is '$K$'. The child now stretches his arms so that the moment of inertia of the system becomes double. The kinetic energy of the system now is
An ideal gas having molar mass $M_0$, has r.m.s. velocity $V$ at temperature $T$. Then
When a photon enters glass from air, which one of the following quantities does not change?
The change in internal energy of the mass of a gas, when the volume changes from $V$ to $2V$ at constant pressure $P$ is ($\gamma = \text{Ratio of } C_p \text{ to } C_v$)
If the terminal speed of a sphere A [density $\rho_A = 7.5\text{ kg}\cdot\text{m}^{-3}$] is $0.4\text{ m/s}$ in a viscous liquid [density $\rho_L = 1.5\text{ kg}\cdot\text{m}^{-3}$], then the terminal speed of a sphere B [density $\rho_B = 3\text{ kg}\cdot\text{m}^{-3}$] of the same size in the same liquid is