List of top Physics Questions

Angular momentum of the particle rotating with a central force is constant due to

The escape velocity of a body depends upon mass as:

Potential energy as a function of $r$ is given by $ U = \frac{A}{r^{10}} - \frac{B}{r^5} $, where $r$ is the interatomic distance, $A$ and $B$ are positive constants. The equilibrium distance between the two atoms will be:

A cell of emf 2V is connected with a load of resistance 1.5Î©. The power delivered by the cell to the load is maximum, then power transferred to the load is

A coil of inductance $ 0.1 \, \text{H} $ and resistance $ 110 \, \Omega $ is connected to an AC source of $ 110 \, \text{V}, 350 \, \text{Hz} $. What is the phase difference between the voltage maximum and the current maximum?

The current $i$ in the circuit given below is

Two wires A and B of same material having length $L_A, L_B$ and radii $R_A, R_B$ and drift velocity $V_A, V_B$ respectively carries same current. If $L_A = L_B$ and $R_A = 2 R_B$ then the value of $\frac{V_A}{V_B}$ is

A 100 $\mu F$ capacitor is connected to a 100 V, 50 Hz AC supply. The rms value of the current is

A wire of length 2 m, cross-sectional area $ 4\ \text{mm}^2 $, and current 1.6 A has electron drift time $ 40 \times 10^{-3} \ \text{s} $. Find electron number density.

Find the current $ i $ in the given circuit.

Capacitive reactance is 3 k$\Omega$. If connected to a source of double frequency, what is new reactance?

In the given circuit, the values of $ I_1, I_2, I_3 $ are respectively:

The resistance of a wire at $ 0^\circ \text{C} $ is $ 20\, \Omega $. If the temperature coefficient of resistance is $ 5 \times 10^{-3}\, ^\circ \text{C}^{-1} $, at what temperature will the resistance double?

A mosquito O is sitting in front of a glass rod having a spherical end of radius of curvature 40 cm. The image would be formed at:

A machine gun fires 300 bullets per minute. If the mass of each bullet is $10g$ and the velocity of the bullets is $600 { m/s}$, the power (in kW) of the gun is:

A capillary tube is attached horizontally to a constant heat arrangement. If the radius of the capillary tube is increased by 25 \% , then the rate of flow of liquid will change nearly by:

An electric current $ I $ enters and leaves a uniform circular wire of radius $ r $ through diametrically opposite points. A charged particle $ q $ moves along the axis of the circular wire and passes through its center at speed $ v $. The magnetic force on the particle when it passes through the center has a magnitude of:

The stopping potential ($V_0$) versus frequency ($\nu$) of a graph for the photoelectric effect in a metal is given. From the graph, the Planck's constant ($h$) is:

A monoatomic gas of molar mass $ m $ is kept in an insulated container. The container is moving with velocity $ v $. If the container is suddenly stopped, then the change in the temperature of the gas is:

A transistor is connected in common-emitter (CE) configuration. The collector supply is 8V and the voltage drop across a resistor of 500 $ \Omega $ in the collector circuit is 0.6V. If the current gain factor $ \alpha $ is 0.96, find the base current.

A submarine A, traveling at $17 { m/s}$, is being chased along the line of its velocity by another submarine B, traveling at $34 { m/s}$. Submarine B sends a sonar signal of $600 { Hz}$ to detect A and receives a reflected sound of frequency $ v $. The value of $ v $ is: \[ {[Speed of sound in water} = 1500 { m/s}] \]

In a Young's double slit arrangement, frings are produced using light of wavelength 4000 Å. One slit is covered by a thin plate of glass of refractive index 1.4 and the other with another glass plate of the same thickness but of refractive index 1.7. By doing so, the central bright fringe shifts to the original sixth fringe from the center. The thickness of the glass plates is:

A direct current of $6A$ is superimposed on an alternating current given by $ I = 10\sin \omega t $ flowing through a wire. The effective value of the resulting current will be:

Transverse waves of the same frequency are generated in two steel wires A and B. The diameter of A is twice that of B, and the tension in A is half that in B. The ratio of the velocities of the waves in A and B is:

An achromatic convergent doublet of two lenses in contact has a power of +5D. The power of the converging lens is +6D. The ratio of the dispersive power of the converging and divergent lenses is: