NEET (UG) entrance exam Question Bank Solutions

Carnot engine cannot give 100% efficiency, because we cannot ______.

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:

A solid spherical ball rolls on an inclined plane without slipping. The ratio of rotational energy and total energy is ______.

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)

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 ______.

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 ______.

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)

A certain pendulum clock with a 12 h dial happens to gain 1.0 min/day. After setting the clock to the correct time, how long must one wait until it again indicates the correct time?

The bottom of swimming pool appears to be less deep than the actual one because of

The distance between two particles is decreasing at the rate of 6 m/s. If these particles travel with same speed and in the same direction, then the separation increases at the rate of 4 m/s. The particles have speed respectively as

A point object moves along an arc of a circle of radius 'R'. Its velocity depends upon the distance covered 'S' as V = `Ksqrt(S)` where 'K' is a constant. If 'e' is the angle between the total acceleration and tangential acceleration, then

The maximum average velocity of water in a tube of diameter 2 cm so that the flow becomes laminar is (The viscosity of water is 10⁻³ Nm⁻² s¹)

A flywheel at rest is to reach an angular velocity of 24 rad/s in 8 second with constant angular acceleration. The total angle turned through during this interval is ______.

The output characteristic curve of a transistor at constant input current is plotted between

From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis, passing through the centre?

Three bodies of the same material and having masses of m, m and 3m are at temperatures of 40°C, 50°C and 60°C respectively. If the bodies are brought in thermal contact, the final temperature will be: