List of top Physics Questions

Two like charges are placed 1 m apart in air. If the force between them is 9 N, and one charge is 1 C, what is the other charge? (Use $ k = 9 \times 10^9 \, \text{Nm}^2/\text{C}^2 $)

The value of acceleration due to gravity on the Moon is about $ \frac{1}{6} $ that on Earth. If an object weighs 60 N on Earth, its weight on the Moon is:

If the velocity–time graph of a body is a straight line inclined to the time axis, the motion has:

A current-carrying straight conductor produces a magnetic field. The direction of the field is given by:

A body of mass 2 kg is raised to a height of 5 m. What is the potential energy gained? (Take $ g = 10 \, \text{m/s}^2 $)

An object is placed 10 cm in front of a concave mirror of focal length 15 cm. The image formed is:

A wave travels along a string with a frequency of 50 Hz and wavelength of 2 m. What is its speed?

A block is resting on a rough horizontal surface. A force is applied horizontally, but the block does not move. What can be said about the frictional force acting on it?

If the temperature of an ideal gas is doubled at constant pressure, what happens to its volume?

A disc of mass $ M $ and radius $ R $ is rolling without slipping with linear velocity $ v $. What is its total kinetic energy?

A wire of resistance 10 $\Omega$ is stretched to twice its original length. What is the new resistance?

Which logic gate is represented by the following combination of logic gates?

A body is projected vertically upward with an initial velocity of 40 m/s. Calculate the maximum height reached by the body. (Take $ g = 9.8 \, \text{m/s}^2 $)

Consider a water tank shown in the figure. It has one wall at $x = L$ and can be taken to be very wide in the z direction. When filled with a liquid of surface tension $S$ and density $ \rho $, the liquid surface makes angle $ \theta_0 $ ($ \theta_0 < < 1 $) with the x-axis at $x = L$. If $y(x)$ is the height of the surface then the equation for $y(x)$ is: (take $g$ as the acceleration due to gravity)

A drop of water of radius 0.0015 mm is falling in air. The coefficient of viscosity of air is $ 1.8 \times 10^5 \, \text{kgm}^{-1} \, \text{s}^{-1} $. If the density of the air is neglected, then what will be the terminal velocity of the drop?

A particle of mass $ m $ and charge $ q $ is fastened to one end $ A $ of a massless string having equilibrium length $ l $, whose other end is fixed at point $ O $. The whole system is placed on a frictionless horizontal plane and is initially at rest. If a uniform electric field is switched on along the direction as shown in the figure, then the speed of the particle when it crosses the x-axis is:

Two identical concave mirrors each of focal length $ f $ are facing each other as shown. A glass slab of thickness $ t $ and refractive index $ n_0 $ is placed equidistant from both mirrors on the principal axis. A monochromatic point source $ S $ is placed at the center of the slab. For the image to be formed on $ S $ itself, which of the following distances between the two mirrors is/are correct:

A body of mass 2 kg is moving with a velocity of 5 m/s. How much work is required to stop the body?

A charged particle moves in a magnetic field with velocity $ v $ perpendicular to the field $ B $. The radius of the circular path is $ r $. Which of the following expressions gives the charge $ q $ of the particle?

The escape velocity from the surface of a planet is 11.2 km/s. If the radius of the planet is doubled but the mass remains the same, what will be the new escape velocity?

A fluid flows through a pipe with varying cross-section. If the velocity at the narrow section is 3 m/s and the cross-sectional area is half of the wider section, what is the velocity in the wider section?

The half-life of a radioactive substance is 4 hours. If initially there are 256 grams, how much remains after 10 hours?