List of top Physics Questions

A series LCR circuit is shown in the figure. Where the inductance of 10 H, capacitance 40 \muF and resistance 60 Ω are connected to a variable frequency 240 V source. The current at resonating frequency is.

The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30$^\circ$. The light ray is also found to be refracted at an angle of 30$^\circ$. Then the refractive index of the liquid is

A solid cylinder rolls down an inclined plane without slipping. If the translational kinetic energy of the cylinder is 140 J, the total kinetic energy of the cylinder is

A solid cylinder of mass 2 kg and radius 0.2 m is rotating about its own axis without friction with angular velocity 5 rad/s. A particle of mass 1 kg moving with a velocity of 5 m/s strikes the cylinder and sticks to it as shown in figure.

The angular velocity of the system after the particle sticks to it will be:

A particle starts from rest and moves in a straight line. It travels a distance $2L$ with uniform acceleration and then moves with a constant velocity a further distance of $L$. Finally, it comes to rest after moving a distance of $3L$ under uniform retardation. Then the ratio of average speed to the maximum speed $ \left( \frac{V_{avg}}{V_{m}} \right) $ of the particle is:

Water flows from a tap of diameter 1.5 cm with velocity $ 7.5 \times 10^{-5} \, \text{m}^{3}\text{s}^{-1} $. The coefficient of viscosity of water is $ 10^{-3} $ Pas. The flow is:

In a given semiconductor, the ratio of the number density of electron to number density of hole is 2 : 1. If $ \frac{1}{7} $th of the total current is due to the hole and the remaining is due to the electrons, the ratio of the drift velocity of holes to the drift velocity of electrons is :

A transformer which steps down 330 V to 33 V is to operate a device having impedance 110 $\Omega$. The current drawn by the primary coil of the transformer is:

A spring of spring constant $ 200 \, {N/m} $ is initially stretched by $ 10 $ cm from the unstretched position. The work to be done to stretch the spring further by another $ 10 $ cm is:

The capacitance of an isolated sphere of radius $ r_1 $ is increased by 5 times when enclosed by an earthed concentric sphere of radius $ r_2 $. The ratio $ \frac{r_1}{r_2} $ is:

A car travelling at 80 kmph can be stopped at a distance of 60 m by applying brakes. If the same car travels at 160 kmph and the same braking force is applied, the stopping distance is:

A balloon carrying some sand of mass $ M $ is moving down with a constant acceleration $ a_0 $. The mass $ m $ of sand to be removed so that the balloon moves up with double the acceleration $ a_0 $ is:

A slab consists of two identical plates of copper and brass. The free face of the brass is at $ 0^\circ C $ and that of copper at $ 100^\circ C $. If the thermal conductivities of brass and copper are in the ratio $ 1:4 $, then the temperature of the interface is:

125 identical charged small spheres coalesce to form a big charged sphere. If the electric potential on each small sphere is 60 mV, then the electric potential on the bigger sphere formed is:

In a region, the electric field is $ (30\hat{i} + 40\hat{j}) $ NC$^{-1}$. If the electric potential at the origin is zero, the electric potential at the point (1 m, 2 m) is

Eight drops of mercury of equal radii and possessing equal charge combine to form a big drop. If the capacity of each drop is $ C $, then capacity of the big drop is:

The time period of revolution of a satellite close to the planet’s surface is 80 minutes. The time period of another satellite which is at a height of 3 times the radius of the planet from the surface is:

When 80 J of heat is absorbed by a monotonic gas, its volume increases by $ 16 \times 10^5 $ $ m^3 $. The pressure of the gas is:

A person climbs up a conveyor belt with a constant acceleration. The speed of the belt is $ \sqrt{\frac{g h}{6}} $ and the coefficient of friction is $ \frac{5}{3\sqrt{3}} $. The time taken by the person to reach from A to B with maximum possible acceleration is:

A light body of momentum $ P_L $ and a heavy body of momentum $ P_H $, both have the same kinetic energy, then:

The maximum height attained by the projectile is increased by 10% by keeping the angle of projection constant. What is the percentage increase in the time of flight?

The acceleration of a particle which moves along the positive $ x $-axis varies with its position as shown in the figure. If the velocity of the particle is $ 0.8 \, \text{m/s} $ at $ x = 0 $, then its velocity at $ x = 1.4 \, \text{m} $ is:

The velocity of a particle is given by the equation $ v(x) = 3x^2 - 4x $, where $ x $ is the distance covered by the particle. The expression for its acceleration is:

The length of the side of a cube is $ 1.2 \times 10^{-2} $ m. Its volume up to correct significant figures is:

A battery of emf $ 8V $ and internal resistance $ 0.5 \Omega $ is being charged by a $ 120V $ DC supply using a series resistor of $ 15.5 \Omega $. The terminal voltage of the $ 8V $ battery during charging is: