NEET (UG) entrance exam Question Bank Solutions for Physics

Consider the following statements (A) and (B) and identify the correct answer.

(A) A Zener diode is connected in reverse bias when used as a voltage regulator.

(B) The potential barrier of the p-n junction lies between 0.1 V to 0.3 V.

The escape velocity from the Earth’s surface is υ. The escape velocity from the surface of another planet having a radius, four times that of Earth and the same mass density is ______.

If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.

An electromagnetic wave of wavelength ‘λ’ is incident on a photosensitive surface of negligible work function. If ‘m’ mass is of photoelectron emitted from the surface has de-Broglie wavelength λ_d, then ______.

A particle of mass ‘m’ is projected with a velocity υ = kV_e (k < 1) from the surface of the earth.

(V_e = escape velocity)

The maximum height above the surface reached by the particle is:

A particle of mass ‘m’ is projected with a velocity υ = kV_e(k < 1) from the surface of the earth.

(V_e = escape velocity) 

The maximum height above the surface reached by the particle is :

If force [F], acceleration [A], and time [T] is chosen as the fundamental physical quantities. Find the dimensions of energy.

An electromagnetic wave of wavelength ‘λ’ is incident on a photosensitive surface of negligible work function. If ‘m’ mass is of photoelectron emitted from the surface has de-Broglie wavelength λ_d, then ______

Consider the following statements (A) and (B) and identify the correct answer.

1. A zener diode is connected in reverse bias, when used as a voltage regulator.
2. The potential barrier of p-n junction lies between 0.1 V to 0.3 V.

The escape velocity from the Earth’s surface is υ. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is ______.

A particle of mass ‘m’ is projected with a velocity υ = kV_e (k < 1) from the surface of the earth.

(V_e = escape velocity)

The maximum height above the surface reached by the particle is ______

A particle of mass ‘m’ is projected with a velocity υ = kV_e (k < 1) from the surface of the earth.

(V_e = escape velocity) 

The maximum height above the surface reached by the particle is:

Two coils of self inductances 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is ______.

An alpha particle enters a hollow tube of 4 m length with an initial speed of 1 km/s. It is accelerated in the tube and comes out of it with a speed of 9 km/s. The time for which it remains inside the tube is

In a two dimensional motion, instantaneous speed v0 is a positive constant. Then, which of the following are necessarily true?

The increase in length on stretching a wire is 0.05%. If its Poisson's ratio is 0.4, then its diameter will be: 

Clouds float in the air due to ______.

Select the correct statement.

The wave nature of electrons was experimentally verified by,

A mass m is suspended from a rigid support P by means of a massless string as shown in figure. A horizontal force F is applied at point O of the rope. The system is in equilibrium when the string makes an angle θ with the vertical. Then the relation between the tension T, force F and angle θ is P