JEE Main entrance exam Question Bank Solutions for Physics (JEE Main)

A ball of mass m = 20 kg released from height h = 10m falls on the Earth's surface. The speed of the Earth when the ball reaches the Earth's surface is ______ × 10^-23 m/s.

A ball is immersed in water kept in container and released. At the same time container is accelerated in horizontal direction with acceleration, `sqrt44` m/s². Acceleration of ball w.r.t. container is ______ m/s² (specific gravity of ball = 12/17, g = 10 m/s²)

A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating: It is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to:

A body starts moving from its origin at t = 0 with a velocity of `5hati` in the x-y plane under the action of force producing an acceleration of `(3hati + 2hatj)` m/s², then y-co-ordinate is ______ m of the body when x-co-ordinate is 84 m.

Which of the following is true for X-rays?

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

The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V respectively. The percentage modulation index will be ______.

The maximum amplitude for an amplitude modulated wave is found to be 12V while the minimum amplitude is found to be 3V. The modulation index is 0.6x where x is ______.

A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal are ______. 

A pebble is thrown vertically upwards from the bridge with an initial velocity of 4.9 m/s. It strikes the water after 2 s. If acceleration due to gravity is 9.8 m/s². The height of the bridge and velocity with which the pebble strikes the water will respectively be ______.

A particle is moving in a straight line such that its velocity is increasing at 5 ms^-1 per meter. The acceleration of the particle is ______  ms^-2 at a point where its velocity is 20 ms^-1.

The speed versus time graph for a particle is shown in the figure. The distance travelled (in m) by the particle during the time interval t = 0 to t = 5 s will be ______.

An automobile, travelling at 40 km/h, can be stopped at a distance of 40 m by applying brakes. If the same automobile is travelling at 80 km/h, the minimum stopping distance, in metres, is ______. (assume no skidding)

The relation between time t and distance x is t = ax² + bx where a and bare constants. The acceleration is ______.

A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. Refracted and reflected rays make an angle of 90° with each other. The angle of reflection and refraction are r and r'. The critical angle is ______.

A wedge of mass M = 2m₀ rests on a smooth horizontal plane. A small block of mass m₀ rests over it at left end A as shown in the figure. A sharp impulse is applied on the block, due to which it starts moving to the right with velocity v₀ = 6 m/s. At the highest point of its trajectory, the block collides with a particle of the same mass m₀ moving vertically downwards with velocity v = 2 m/s, and gets stuck with it. If the combined mass lands at the end point A of the body of mass M, the length l is ______ cm. Neglect friction, take g = 10 m/s².

A body of mass 0.5 kg travels on straight line path with velocity v = (3x² + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.

A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?

The position vector of 1 kg object is `vecr = (3hati - hatj)` m and its velocity `vecv = (3hati + hatk)` ms⁻¹. The magnitude of its angular momentum is `sqrtx` Nm where x is ______.