List of top Physics Questions

The phenomenon of physics that deals with the constitution and structure of matter at the minute scales of atoms and nuclei is

A full wave rectifier circuit with diodes ($D_1$) and ($D_2$) is shown in the figure. If input supply voltage $V_{in} = 220 \sin(100 \pi t)$ volt, then at $t = 15$ msec:

A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of 800 $ cm^3 $ and temperature 27°C. The change in temperature when the gas is adiabatically compressed to 200 $ cm^3 $ is: (Take $ \gamma $ = 1.5 : $ \gamma $ is the ratio of specific heats at constant pressure and at constant volume)

A light wave is propagating with plane wave fronts of the type $ x + y + z = \text{constant} $. The angle made by the direction of wave propagation with the $ x $-axis is:

What is the most commonly used energy source in everyday life?

Find the equivalent capacitance between A and B, where $ C = 16 \, \mu F $.

A plane electromagnetic wave of frequency 20 MHz travels in free space along the +x direction. At a particular point in space and time, the electric field vector of the wave is $ E_y = 9.3 \, \text{V/m} $. Then, the magnetic field vector of the wave at that point is:

Which of the following circuits represents a forward biased diode?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Emission of electrons in photoelectric effect can be suppressed by applying a sufficiently negative electron potential to the photoemissive substance.
Reason (R): A negative electric potential, which stops the emission of electrons from the surface of a photoemissive substance, varies linearly with frequency of incident radiation.
In light of the above statements, choose the most appropriate answer from the options given below:

Electric flux $ \varphi $ is related with linear charge density $ \lambda $ and surface charge density $ \sigma $ as $ \varphi = \alpha \lambda + \beta \sigma $. Where $ \alpha $ and $ \beta $ are of appropriate dimension. The dimension of $ \frac{\beta}{\alpha} $ is:

The output of the circuit is low (zero) for:

(A) $ X = 0, Y = 0 $
(B) $ X = 0, Y = 1 $
(C) $ X = 1, Y = 0 $
(D) $ X = 1, Y = 1 $
Choose the correct answer from the options given below:

Three infinitely long wires with linear charge density $ \lambda $ are placed along the x-axis, y-axis and z-axis respectively. Which of the following denotes an equipotential surface?

The top and bottom parts of a cylindrical tube are in contact with each other. Which statement is correct?

What is the current flowing in the circuit shown? (The resistor is 100$Ω$, and the voltage is +6V and +5V).

The velocity-time graph of an object moving along a straight line is shown in the figure. What is the distance covered by the object between $ t = 0 $ to $ t = 4s $?

The angle $ \phi $ is the angle of elevation from the horizontal to the object. The angle of elevation of the object from the point of observation is $ 1^\circ $. The horizontal distance between the object and the observer is given as $ d $. What is the expression for the distance in terms of $ \phi $?

Two balls are projected with the same speed at different angles. If the maximum height of the first ball is 2 times the maximum height of the second ball, find the ratio of their time of flight.

The magnitude of heat exchanged by a system for the given cyclic process ABC (as shown in the figure) is (in SI units):

The energy $ E $ and momentum $ p $ of a moving body of mass $ m $ are related by some equation. Given that $ c $ represents the speed of light, identify the correct equation:

Choose the correct nuclear process from the below options:

Choose the correct nuclear process from the below options:
$ [ p : \text{proton}, n : \text{neutron}, e^- : \text{electron}, e^+ : \text{positron}, \nu : \text{neutrino}, \bar{\nu} : \text{antineutrino} ] $

The torque due to the force $ \left( 2\hat{i} + \hat{j} + 2\hat{k} \right) $ about the origin, acting on a particle whose position vector is $ \hat{i} + \hat{j} + \hat{k} $, would be:

A small rigid spherical ball of mass $ M $ is dropped in a long vertical tube containing glycerine. The velocity of the ball becomes constant after some time. If the density of glycerine is half of the density of the ball, then the viscous force acting on the ball will be (consider $ g $ as acceleration due to gravity):

Which isotope is represented by $ 12_6C $?

Two polarisers $ P_1 $ and $ P_2 $ are placed in such a way that the intensity of the transmitted light will be zero. A third polariser $ P_3 $ is inserted in between $ P_1 $ and $ P_2 $, at the particular angle between $ P_1 $ and $ P_2 $. The transmitted intensity of the light passing the through all three polarisers is maximum. The angle between the polarisers $ P_2 $ and $ P_3 $ is: