List of top Physics Questions

A battery consists of a variable number ‘n’ of identical cells (having internal resistance ‘r’ each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n ?
The moment of the force, \(\overrightarrow{F}=4\hat{i}+5\hat{j}-6\hat{k}\) at (2, 0, -3), about the point (2, -2, -2), is given by
In the combination of the following gates the output Y can be written in terms of inputs A and B as
combination of the following gates the output Y
The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is
ratio of work done by the gas, to the heat absorbed
A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 105 Nm-2 ) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is
A body of mass 2 kg thrown vertically upward from the ground with a velocity of $8 \, ms^{-1}$ reaches a maximum height of 3 in. The work done by the air resistance is_______ (Acceleration due to gravity = $10 \, ms^{-2}$)
A force is applied to an object that is free to move. Which of the following statements is correct?
A rigid bar of mass 15 kg is supported symmetrically by three wires each 2 m long. Those at each end are of copper and the middle one is of iron. Determine the ratio of their diameters if each is to have the tension.
An astronaut is standing on an asteroid when he accidentally drops a wrench. He observes that the gravitational acceleration on the asteroid is 2.4 m/s². If he had thrown the wrench at an upward angle instead, he would have found the gravitational acceleration on the asteroid to be
The two-dimensional cube in the diagram below has charged objects placed at the corners as shown. An electron that is free to move is placed at the exact centre of the cube. In which direction will the electron move?
A body takes 5 min for cooling from 50°C to 40°C. Its temperature comes down to 33.33°C in the next 5 min. Temperature of the surroundings is
A TV tower has a height of 100 m. How much population is covered by TV broadcast, if the average population density around the tower is \( 1000 \, {km}^{-2} \) (radius of Earth = \( 6.4 \times 10^6 \, {m} \))?
The number of neutrons released during the fission reaction \[ {n} + ^{235} {U} \longrightarrow ^{133} {Sb} + ^{99} {Nb} + {neutrons is} \]
For a monoatomic gas, work done at constant pressure is W. The heat supplied at constant volume for the same rise in temperature of the gas is
For constructive interference to take place between two monochromatic light waves of wavelength \( \lambda \), the path difference should be
If the work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of the same material but with double radius of cross-section and half the length by 1 mm is
A particle of mass \( m \) executes SHM with amplitude \( a \) and frequency \( v \). The average kinetic energy during its motion from the position of equilibrium to the end is
Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the center. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is

A force \( F = (2 + x) \, \text{N} \) acts on a particle in the x-direction. The work done by this force during a displacement from \( x = 1.0 \, \text{m} \) to \( x = 2.0 \, \text{m} \) is?

When a hydrogen atom is raised from the ground state to the fifth state
A particle moves in one dimension. Its velocity is given by \( v(t) = c_2 t^2 + c_1 t + c_0 \) where \( c_1 \) and \( c_2 \) are constants. What is the acceleration of the particle at time \( t = 1 \)?
A light ray falls on a square glass slab as shown in the figure. The index of refraction of the glass, if total internal reflection is occur at vertical face, is equal to
A positive point charge is placed at the origin. There is an electric field \( E'(x) = 2, 2 + 3 \) that accelerates the Udder point charge along the x-axis. Determine the energy of the charge when it reaches the position \( x = 21 \).

A 4 cm thick layer of water covers a 6 cm thick glass slab. A coin is placed at the bottom of the slab and is being observed from the air side along the normal to the surface. Find the apparent position of the coin from 

A substance's specific heat is a function of its