List of top Physics Questions asked in MHT CET

Choose the correct statement. In conductors
In cyclotron, the time taken by an ion to describe semicircular path in a dee is
Electron in Hydrogen atom first jumps from third excited state to second excited state and then from second excited state to first excited state. The ratio of the wavelengths \( \lambda_1 : \lambda_2 \) emitted in the two cases respectively is
Resultant of two vectors \( \vec{P} \) and \( \vec{Q} \) is of magnitude \( R_1 \). If the direction of \( \vec{Q} \) is reversed, the resultant is of magnitude \( R_2 \). The value of \( (R_1^2 + R_2^2) \) is \( \cos (\pi - \theta) = - \cos \theta \)
Two small drops of mercury each of radius \( R \) coalesce to form a large single drop. The ratio of the total surface energies before and after the change is
Magnetic field at the centre of a circular loop of area \( A \) is \( B \). The magnetic moment of the loop will be (\( \mu_0 \) = permeability of free space)
Above the curie temperature the susceptibility of a ferromagnetic substance varies
In meter bridge experiment, to minimize an error due to contact resistance,
A solid cylinder of mass \( M \) and radius \( R \) rolls down a smooth inclined plane about its own axis and reaches the bottom with velocity \( v \). The height of the inclined plane is
Two cars of masses \( m_1 \) and \( m_2 \) are moving in the circles of radii \( r_1 \) and \( r_2 \) respectively. Their angular speeds \( \omega_1 \) and \( \omega_2 \) are such that they both complete one revolution in the same time \( t \). The ratio of linear speed of \( m_1 \) to the linear speed of \( m_2 \) is
A body is projected vertically upwards from earth’s surface with velocity \( 2v_e \), where \( v_e \) is escape velocity from earth’s surface. The velocity when body escapes the gravitational pull is
The frequency of two tuning forks A and B are 1.5% more and 2.5% less than that of the tuning fork C. When A and B are sounded together, 12 beats are produced in 1 second. The frequency of tuning fork C is
A parallel combination of pure inductor and capacitor is connected across a source of alternating e.m.f. \( e \). The currents flowing through an inductor and capacitor are \( i_L \) and \( i_C \) respectively. In this parallel resonant circuit, the condition for currents \( i, i_L, i_C \) (i.e. \( i \) = net r.m.s. current in the circuit) is
A stationary body explodes into two parts of masses \( M_1 \) and \( M_2 \). They move in opposite directions with velocities \( v_1 \) and \( v_2 \). The ratio of their kinetic energies is
Two wires 'A' and 'B' of equal lengths are connected in left and right gaps of a meter bridge, respectively. The null point is obtained at 40 cm from the left end. Diameters of the wires 'A' and 'B' are in the ratio 3:1, the ratio of specific resistance of 'A' to that of 'B' is
A ball of mass \( m \) is attached to the free end of an inextensible string of length \( \ell \). Let \( T \) be the tension in the string. The ball is moving in a horizontal circular path about the vertical axis. The angular velocity of the ball at any particular instant will be
The maximum velocity of the photoelectron emitted by the metal surface is \( v \). Charge and mass of the photoelectron is denoted by \( e \) and \( m \) respectively. The stopping potential in volt is
A pipe open at one end has length 0.8 m. At the open end of the tube a string 0.5 m long is vibrating in its 1st overtone and resonates with the fundamental frequency of the pipe. If tension in the string is 50 N, the mass of the string is (speed of sound = 320 m/s)
Figure shows three forces \( F_1, F_2, F_3 \) acting along the sides of an equilateral triangle. If the total torque acting at point 'O' (centre of the triangle) is zero then the magnitude of \( F_3 \) is
If the dimensions of a physical quantity are given by \( [L^{-1} M^0 T^1] \), then the physical quantity is
The potential differences that must be applied across the parallel and series combination of 3 identical capacitors is such that the energy stored in them becomes the same. The ratio of potential difference in parallel to series combination is
The unit vector \( (ai + bj) \) is perpendicular to \( (i + j) \). The value of 'b' is
A rotating body has angular momentum $L$. If its frequency of rotation is halved and rotational kinetic energy is doubled, its angular momentum becomes
One mole of a diatomic gas does a work $\frac{Q{3}$, when the amount of heat supplied is $Q$. In this process, the molar heat capacity of the gas is}
A metal rod of Young’s modulus $Y$ and coefficient of linear expansion $\alpha$ has its temperature raised by $\Delta \theta$. The linear stress to prevent the expansion of rod is ($L$ and $\ell$ are original length of rod and expansion respectively)