List of top Physics Questions

The bulk modulus \( B \) and compressibility \( k \) are related by:
A satellite of mass 500 kg is in an orbit around the earth at a distance of \( 6.67 \times 10^6 \, m \) from the center of the Earth. The speed of the satellite is:
The translational kinetic energy of a circular disc of mass 1.5 kg rolling on a horizontal surface without slipping is 24 J. The total kinetic energy of the disc is:
A simple pendulum is suspended in a car moving on a circular track of radius \( R \) with a uniform speed of \( \sqrt{1.732 g R} \). The pendulum is making small oscillations in a radial direction about its equilibrium position with a time period \( T \). If the car is at rest, the time period of the pendulum is:
A girl of mass 30 kg stands at one end of a plank of mass 120 kg and length 4 m. Initially the plank lies at rest on a horizontal frictionless surface. If the girl walks to the other end of the plank, the distance that the girl moves relative to the ground is:
The time taken by a net force of 10 N to change the velocity by 4 m/s of a body of mass 10 kg is:
The work done in lifting a body of mass 2 kg from the surface of the earth to a height 10 m is:
A point \(P\) on the wheel of radius \(R\) is initially in contact with the ground. When the wheel rolls forward half a revolution, the displacement of the point \(P\) is:
A car is moving with a speed of 5 m/s on a circular road having radius of curvature 10 m and coefficient of friction 0.5. For the safe journey of the car, the banking angle of the road should be:
An electron moving along positive x-direction with velocity \( 2 \times 10^5 \) ms\(^{-1}\) enters a magnetic field of \( \vec{B} = \hat{i} + 4 \hat{j} + 3 \hat{k} \) T. The magnitude of the force acting on the electron is:

A block of mass 1 kg is attached to a horizontal spring and rests on a horizontal surface with a coefficient of friction 0.4. If the body is displaced by 1 cm by the tension in the spring, then the work done by the frictional force is:

The most accurate measurement among the following is:
The driver of a train moving with speed \(V_1\), observes a train moving at distance \(d\) ahead on the same track slowly in the same direction with a speed \(V_2\). The driver applies breaks to give his train a constant retardation \(a\). If there was no collision between the trains, then
One mole of an ideal gas undergoes two different cyclic processes I and I, as shown in the P-V diagrams below. In cycle, I processes a, b, c and d are isobaric, isothermal, isobaric, and isochoric, respectively. In cycle II, processes a',b',c', and d' are isothermal, isochoric, isobaric, and isochoric, respectively. The total work done during cycle I is 𝑊I and that during cycle II is 𝑊II. The ratio WI/WII is
A steel ball of radius 0.05 cm and density \( 7.8 \, \text{g/cm}^3 \) is dropped into water. What is its terminal velocity?
(Density of water \( = 1 \, \text{g/cm}^3 \), Viscosity of water \( = 0.001 \, \text{Pas} \))
In a transistor circuit, if emitter and collector connections are interchanged then
A body is thrown vertically upwards with an initial velocity \( u \). If \( g \) is the acceleration due to gravity, then the total time taken for the body to return to the starting point is:
To heat the food containing water, the frequency of the microwaves used in microwave oven is:
The following is not used as a nuclear fuel.
A radioactive material whose half life period is 2 years weighs 1 g and is stored in the laboratory for 4 years. Then the amount of remaining radioactive material is
The threshold wavelength of a photosensitive material is equal to the frequency of H$_\alpha$ line of hydrogen. If a photon whose frequency equal to the frequency of H$_\beta$ line of hydrogen is incident on this photosensitive material, the maximum kinetic energy of the emitted photoelectrons is: (R -- Rydberg's constant, h -- Planck's constant and c -- speed of light in vacuum)
A resistor of resistance 40 \( \Omega \), a capacitor of capacitive reactance 20 \( \Omega \) and an inductor of inductive reactance 50 \( \Omega \) are connected in series to an ac source of 100 V. The current through the circuit is:
The self-inductance of a long solenoid of cross-sectional area \( A \), length \( l \) and \( n \) turns per unit length is given by:
In a hydrogen atom, an electron in an orbit with principal quantum number \( n \) jumps to the first excited state, emitting a photon of wavelength \( \lambda \). Then the value of \( n \) is:
Which of the following do not exist?