List of top Physics Questions

Algebraic sum of potential differences in a closed loop is

Dentist uses this mirror to examine teeth of patients.

An incompressible liquid is filled in a container. There is air above the liquid and a massless movable piston with a hole is also placed on the air. A thin capillary tube of inner radius 0.1 mm is dipped vertically into the liquid through the hole on the piston as shown in the figure. The air in the container is isothermally compressed from the original volume V₀ to \(\frac{100}{101}\)V₀ with the movable piston. Considering air as an ideal gas, the height (h) of the liquid column in the capillary above the liquid level in cm is:

(given T_water =0.075N/m, P₀=10⁵N/m² , g=10m/sec²,  \(\rho l\)=10³ kg/m³, \(\theta=0\))

A cyclic process is shown in the p-v diagram and T-S diagram. Which of the following statement(s) is/are true?

Three resistors having resistances r₁, r₂ and r₃ are connected as shown in the given circuit. The ratio \(\frac{i_3}{i_1}\) of currents in terms of resistances used in the circuit is

When a p-n junction diode is in forward bias, which type of charge carriers flows in the connecting wire?

A particle at rest starts from the origin with a constant acceleration a that makes an angle 60° with the positive y-axis. If its displacement along y-axis is 10m in time 2s,then the magnitude of a is:

For a given electric current the drift velocity of conduction electrons in a copper wire is v_d and their mobility is μ . When the current is increased at constant temperature

The horizontal component of Earth’s magnetic field at a place is 3 × 10^-5 T. If the dip at that place is 45°, the resultant magnetic field at that place is

The speed of sound in an ideal gas at a given temperature T is v. The rms speed of gas molecules at that temperature is v_rms. The ratio of the velocities v and v_rms for helium and oxygen gases are X and X' respectively. Then \(\frac{X}{X'}\) is equal to

A particle is in uniform circular motion. Related to one complete revolution of the particle, which among the stataments is incorrect ?

Five capacitors each of value 1 μF are connected as shown in the figure. The equivalent capacitance between A and B is

100 g of ice at 0 °C is mixed with 100 g of water at 100 °C. The final temperature of the mixture is
[Take L_f= 3.36 × 10⁵ J kg^-1 and S_w = 4.2 × 10³ J kg^-1 k-¹]

A body of mass 10 kg is kept on a horizontal surface. The coefficient of kinetic friction between the body and the surface is 0.5. A horizontal force of 60N is applied on the body. The resulting acceleration of the body is about

Two pendulums of length 121 cm and 100 cm start vibrating in phase. At some instant, the two are at their mean position in the same phase. The minimum number of vibrations of the shorter pendulum after which the two are again in phase at the mean position is:

An ideal transfomer has a turns ratio of 10. When the primary is connected to 220V,50Hz ac source, the power output is

What is the SI unit of rate of diffusion?

A ball of mass 0.2 kg is thrown vertically down from a height of 10 m. It collides with the floor and loses 50% of its energy and then rises back to the same height. The value of its initial velocity is

Find the Current unit conversion from SI to CGS.

At the pure inductive stage, find e_max.

Find the height of a conical pendulum if the time period is given.

Find the change in the charge carriers of a p-n junction diode if its temperature is increased?