NEET (UG) entrance exam Question Bank Solutions for Physics

When a string is stretched by 0.5 cm, its potential energy is U. If the string is stretched by 2 cm, then its potential energy will be: 

When a string is stretched by 0.5 cm, its potential energy is U. If the string is stretched by 2 cm, then its potential energy will be: 

A rain drop of radius 0.3 mm has a terminal velocity in the air of 1 m/s. The viscosity of air is 18 x 10⁻⁵ poise. The viscous force on it is:  

A bullet fired from gun with a velocity 30 m/s at an angle of 60° with horizontal direction. At the highest point of its path, the bullet explodes into two parts with masses in the ratio 1:3. The lighter mass comes to rest immediately. Then the speed of the heavier mass is

Four bodies of masses 2 kg, 3 kg, 4 kg and 5 kg are placed at points A, B, C, and D respectively of a square ABCD of side 1 metre. The radius of gyration of the system about an axis passing through A and perpendicular to plane is

For transistor action, which of the following statements is correct?

An object is moving in a positive direction with positive acceleration. The velocity-time graph with constant acceleration which represents the above situation is:

A body of mass m is projected horizontally with a velocity v from the top of a tower of height h and it reaches the ground at a distance x from the foot of the tower. If the second body of mass of 4 m is projected horizontally from the top of a tower of the height of 4 h, it reaches the ground at a distance of 4x from the foot of the tower. The horizontal velocity of the second body is:

If the mass of all molecules of a gas is halved and their speeds doubled, then the ratio of initial and final pressures is ________. 

A wheel of mass 15 kg has a moment of inertia of 200 kg-m² about its own axis, the radius of gyration will be:

The terminal potential difference of a cell is greater than its e.m.f when it is ______

An electron is projected along the axis of a circular conductor carrying some current. Electron ______

In an n-p-n transistor 10¹⁰ electrons enter the emitter in 10^-6 s. If 2% of the electrons are lost in the base. What is the current transfer ratio and the current amplification factor?

The transformation ratio in the step-up transformer is ______

A ball rolls of the top of the stairway with a horizontal velocity u ms⁻¹. If the steps are h m high and b m wide, the ball will hit the edge of the n^th step, if:

Two short magnets having magnetic moments in the ratio 27 : 8, when placed on opposite sides of a deflection magnetometer, produces no deflection. If the distance of the weaker magnet is 0.12 m from the centre of deflection magnetometer the distance of the stronger magnet from the centre is ______.

A car starts from rest and accelerates at 5 m/s². At t = 4 s, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at t = 6 s? (Take g = 10 m/s²)

From a circular ring of mass, ‘M’ and radius ‘R’ an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is ‘K’ times ‘MR²’. Then the value of ‘K’ is ______.

From a circular ring of mass ‘M’ and radius ‘R’ an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is ‘K’ times ‘MR²’. Then the value of ‘K’ is ______.

A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution.

If this particle were projected with the same speed at an angle ‘θ’ to the horizontal, the maximum height attained by it equals 4R. The angle of projection, θ, is then given by ______.