List of top Physics Questions asked in MHT CET

Radioactive materials A and B have decay constants ' \( 9\lambda \) ' and ' \( \lambda \) ' respectively. Initially they have same number of nuclei. The ratio of number of nuclei of material ' \( A \) ' to that of ' \( B \) ' will be \( \left( \frac{1}{e} \right) \) after time ' \( t \) '. So ' \( t \) ' is equal to

An ideal gas of mass \( M \) in the state \( A \) goes to another state \( B \) via three different processes. If \( Q_1, Q_2 \) and \( Q_3 \) denote the heat absorbed by the gas along the paths 1, 2 and 3 respectively, then

Two bodies A and B have their moments of inertia ' \( I \) ' and ' \( 2 I \) ' respectively about their axis of rotation. If their kinetic energy of rotation are equal then angular momentum of body A to that of body \( B \) will be in the ratio

To manufacture a solenoid of length ' \( l \) ' and inductance ' \( L \) ', the length of the thin wire required is (cross - sectional diameter of a solenoid is considerably less than length, \( \mu_0 = \) permeability of free space)

For a transistor, the current amplification factor \( \alpha \) is \( 0.8 \). The transistor is then connected in common emitter configuration. The change in the collector current when the base current changes by \( 6 \text{ mA} \) is

A spring has length ' \( L \) ' and force constant ' \( K \) '. It is cut into two springs of length ' \( L_1 \) ' and ' \( L_2 \) ' such that \( L_1 = nL_2 \) (n is an integer). The force constant of the spring of length ' \( L_2 \) ' is

The period of revolution of planet A around the sun is 8 times that of \( B \). The distance of \( A \) from the sun is how many times greater than that of \( B \) from the sun?

A soap bubble of radius \( R \) is surrounded by another soap bubble of radius \( 2R \) as shown in figure. The excess pressure inside the smaller soap bubble will be (\( T \) = surface tension of soap solution)

A resistor of \( 400\,\Omega \) and an inductance of \( 0.4\,\text{H} \) are in series with an a.c. source of e.m.f. \( E = 200\sqrt{2}\sin(1000t) \). The power factor of the circuit is

A plane wavefront of width ' \( x \) ' is incident on an air-water interface and the corresponding refracted wavefront has a width ' \( y \) ' as shown in figure. The refractive index of air with respect to water in terms of distances ' \( w \) ' and ' \( z \) ' is (AD = w, CB = z)

A blackbody at \( 1227^\circ\text{C} \) emits radiation with maximum intensity at a wavelength of \( 5600\,\text{\AA} \). If the temperature of the body is increased by \( 1000^\circ\text{C} \), the maximum intensity will be at wavelength

The intermediate image formed by an objective lens of a compound microscope is

The third overtone of a closed pipe of length ' \( L_c \) ' has the same frequency as the third overtone of an open pipe of length ' \( L_o \) '. The ratio ' \( L_c \) ' : ' \( L_o \) ' is equal to (Neglecting end correction)

A solid sphere and a ring have equal mass and equal radius of gyration. If sphere is rotating about its diameter and ring about an axis passing through centre and perpendicular to its plane, then the ratio of radius of sphere to that of ring is \( \sqrt{\frac{x}{2}} \) then the value of ' x ' is

The centre of mass of a system of particles does NOT depend on

Which of the following is NOT an example of diamagnetic substance?

A wheel of diameter 20 cm is rotating at 600 rpm. The linear velocity of a particle at its rim is:

The potential energy of a particle performing linear S.H.M is \( 0.1 \pi^2 x^2 \) joules. If the mass of the particle is \( 20 \, \mathrm{g} \), find the frequency of S.H.M:

In a meter bridge experiment, a resistance of \( 10 \, \Omega \) is balanced by a resistance \( X \) with a balance point at \( 40 \, \mathrm{cm} \). What is the value of \( X \)?

What is the magnetic field produced inside a solenoid?

What is the output of a NAND gate when both inputs are HIGH?