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 $)

A concave mirror has a focal length of 20 cm. An object is placed 60 cm in front of the mirror. Find the image distance.

If $ a(u + x^2) = x $ and $ y - x^3 = a^2 $, then $ \frac{dy}{dx} $ at $ x = 1 $ is:

A polaroid sheet is rotated between two crossed polarizers. The intensity of transmitted light would be maximum, when the angle between the axes of the first polarizer and the polaroid sheet is

A body of mass 100 g is moving in a circular path of radius 2 m on a vertical plane as shown in the figure. The velocity of the body at point A is 10 m/s. The ratio of its kinetic energies at point B and C is: (Take acceleration due to gravity as 10 m/s$^2$)

A block slides down a smooth inclined plane, and its acceleration is found to be $ \frac{g}{8} $. If $ g $ is the acceleration due to gravity, what is the angle of inclination $ \theta $ of the plane?

The truth table for the circuit given below is:

Choose the correct answer from the options given below:

A long wire with a small current element of length 1 cm is placed at the origin and carries a current of 10 A along the x-axis. The magnitude of the magnetic field, due to the element, on the y-axis at a distance 0.5 m from it, would be

Which of the following circuits has the same output as that of the given circuit?

A point particle of charge $ Q $ is located at $ P $ along the axis of an electric dipole 1 at a distance $ r $ as shown in the figure. The point $ P $ is also on the equatorial plane of a second electric dipole 2 at a distance $ r $. The dipoles are made of opposite charge $ q $ separated by a distance $ 2a $. For the charge particle at $ P $ not to experience any net force, which of the following correctly describes the situation?

A car accelerates uniformly from rest to a velocity of $ 25 \, \text{m/s} $ in $ 10 \, \text{seconds} $. What is the acceleration of the car?

A pendulum completes 20 oscillations in 40 seconds. What is its frequency?

Two identical bodies of mass 1 kg each are moving towards each other with velocities of 5 m/s and 3 m/s, respectively. They collide elastically. What will be the velocity of the body initially moving at 5 m/s after the collision?

A simple pendulum of length 1 m is oscillating with an amplitude of 0.1 m. What is the maximum tension in the string if the mass of the bob is 0.2 kg? (Assume $ g = 10 \, \text{m/s}^2 $)

A hemispherical vessel is completely filled with a liquid of refractive index $ \mu $. A small coin is kept at the lowest point $ O $ of the vessel as shown in the figure. The minimum value of the refractive index of the liquid so that a person can see the coin from point $ E $ (at the level of the vessel) is:

A long straight wire of a circular cross-section with radius $ a $ carries a steady current $ I $. The current is uniformly distributed across this cross-section. The plot of magnitude of magnetic field $ B $ with distance $ r $ from the centre of the wire is given by:

The area enclosed between the parabola $ y^2 = 4x $ and the line $ y = 2x - 4 $ is:

To obtain the given truth table, the following logic gate should be placed at G

When an object is placed 40 cm away from a spherical mirror an image of magnification $\frac{1}{2}$ is produced. To obtain an image with magnification of $\frac{1}{3}$, the object is to be moved:

A sinusoidal wave of wavelength 7.5 cm travels a distance of 1.2 cm along the x-direction in 0.3 sec. The crest P is at $ x = 0 $ at $ t = 0 $ sec and maximum displacement of the wave is 2 cm. Which equation correctly represents this wave?

If the potential energy of an electron in an orbit of hydrogen atom is $-6.80$ eV, then the energy required to ionize the atom is

If the half life of an element is 10 minutes, then the time taken (in minutes) for the element to decay from 20% to 80% is

If the breakdown voltage of a Zener diode is 7.2 V and the maximum power dissipated is 216 mW, then the maximum current through the Zener diode is

For a common emitter transistor amplifier, the voltage across the collector resistance is 2.8 V. If the current amplification factor of the transistor is 70 and the collector resistance is 2 k$\Omega$, then the base current is

If mass of 5 neutrons is x, mass of 2 protons is y and the mass of the nucleus $_{10}X^{20}$ is z, then the binding energy of the nucleus X is (Speed of light in vacuum is c)