List of top Physics Questions

If a body of mass 5 kg has a linear momentum of 4 kg⋅m/s, find the kinetic energy.

If work function of a metal is 6.6 eV, find the threshold wavelength. \text{Given} \( h = 6.6 \times 10^{-34} \, \text{J} \cdot \text{s} \).

Find the relation between the wavelength of proton and electron, if both particles have the same kinetic energy.

A galvanometer of 500Ω resistance is shunted such that only 4% of the current passes through the galvanometer. Find the shunt resistance.

If an open pipe suddenly closed, the frequency of the third harmonic of the closed pipe is 50Hz more than the fundamental frequency of the open pipe. Find the fundamental frequency.

Two identical capacitors of capacitance \( C \) are connected in series. If the space between the plates of one of the capacitors is filled with a medium of dielectric constant \( k \), what is the effective capacitance?

If a body travels half of the total distance with velocity of \(20 \, \text{km/hr}\) and other half with velocity of \(30 \, \text{km/hr}\), find average velocity.

If \( I \), \( E \) and \( L \) are the moment of inertia, rotational kinetic energy, and angular momentum respectively, then:

Given mass of neutron \( 1.0087 \, u \), mass of proton \( 1.0073 \, u \), mass of \( ^4He \) \( = 4.0018 \, u \), find the binding energy of He.

Kirchhoff's first and second laws are consequence of conservation of ----- and ----- respectively:

If the ratio of escape velocities is 3:2 from two different planets A and B of radii in the ratio 2:3, find the ratio of acceleration due to gravity at the surface of A to that at the surface of B.

What is the ratio of maximum height attained to the height attained at \( t = 1 \) s for a projectile of initial velocity \( u \) projected at an angle \( 30^\circ \) with horizontal?

If \( r_1 = \frac{c_p}{c_v} \) of a rigid diatomic gas and \( r_2 = \frac{c_p}{c_v} \) of a non-rigid diatomic gas, find \( r_1 \) and \( r_2 \).

What is the number of significant figures in \( 420.00040 \times 10^{-3} \)?

Two metallic spheres of radii 1:2 are connected by a conducting wire. What is the ratio of electric field intensities at their surface?

Dimension of Planck's constant is same as that of:

When light containing photon of energy \(2h\nu_0\) falls on a metal of work function \(h\nu_0\), electrons of velocity \(v_1\) are ejected. When photons of energy \(5h\nu_0\) is incident, velocity of electrons ejected is \(v_2\). What is the ratio \( \frac{v_1}{v_2} \)?

The distance between two charges \( q_1 = +2 \, \mu C \) and \( q_2 = +8 \, \mu C \) is 15 cm. Calculate the distance from the charge \( q_1 \) to the points on the line segment joining the two charges where the electric field is zero.

What is the power factor of an AC circuit containing only a pure resistor?

In an AC circuit, what is the power factor of a pure resistor?

What is the value of escape velocity on the Earth's surface?

Which of the following statement is incorrect about Bohr's model of atom?

Two masses connected in series with two massless strings are hanging from a support as shown in the figure. Find the tension in the upper string.

The magnetic force acting on a charged particle carrying a charge of \( 3 \, \mu C \) in a magnetic field of 5 T acting in the \( y \)-direction, when the particle velocity is \( ( \hat{i} + \hat{j} ) \times 10^5 \, \text{ms}^{-1} \), is:

A galvanometer of resistance 100 \(\Omega\) gives a full scale deflection for a current of 1 mA through it. The resistance required to convert it into a voltmeter which can read up to 2 V is: