List of top Physics Questions

Which of the following graph correctly represents the variation of resistivity ‘s’ the temperature ‘T’ for a semiconductor material?

An aluminium wire is stretched to make its length, 0.4% larger. The percentage change in resistance is

A battery of emf E and internal resistance r is connected with an external resistance R as shown in figure. The battery will act as a constant voltage source if:

In the following circuit, the equivalent resistance between X and Y is ...... $ \Omega $:

In a resonance column, the first and second resonance are obtained at depths 24 cm and 78 cm. The third resonance will be obtained at what depth?

For an insulator, the forbidden energy gap is:

In the circuit shown in the figure, the AC source gives a voltage $ V = 20\cos(2000t) $. Neglecting source resistance, the voltmeter and ammeter readings will be:

The recoil speed of a hydrogen atom after it goes from $ n = 5 $ state to $ n = 1 $ state will be:

Zener breakdown occurs in a p − n junction having p and n both:

A stone of mass $ m $, tied to a string is being whirled in a vertical circle with a uniform speed. The tension in the string is:

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 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: