NEET (UG) entrance exam Question Bank Solutions for Physics

A capacitor of capacitance ‘C’, is connected across an ac source of voltage V, given by

V = V₀sinωt 

The displacement current between the plates of the capacitor would then be given by:

Assertion: If distance travelled by a body is not zero, then displacement of a body will be a non-zero.

Reason: Displacement of a body is the shortest distance between initial and final positions.

If the temperature increases, the modulus of elasticity. 

A cricket ball thrown across a field is at heights h₁ and h₂ from the point of projection at times t₁ and t₂ respectively after the throw. The ball is caught by a fielder at the same height as that of projection. The time of flight of the ball in this journey is

Diffraction effects are easy to notice in the case of sound waves than in case of light waves because

A system of two particles is having masses m₁ and m₂. If the particle of mass m₁ is pushed towards the centre of mass of particles through a distance d, by what distance the particle of mass m₂ should be moved so as to keep the centre of mass of particles at the original position?

On doping an intrinsic semiconductor with a group V element, free electrons in the conduction band are the majority charge carriers and the resulting semiconductor has a net

A liquid drop having surface energy 'E' is spread into 512 droplets of the same size. The final surface energy of the droplets is ______.

Three uniform spheres, each having mass m and radius r, are kept in such a way that each touches the other two. The magnitude of the gravitational force on any sphere due to the other two is

If the temperature on the Fahrenheit scale is 140 °F, then the same temperature on the Kelvin scale will be:  

The speed of sound in hydrogen is 1270 m/s. The speed of sound in the mixture of oxygen and hydrogen in which they are mixed in 1:4 ratio is

When a gas is in thermal equilibrium, its molecules have ______. 

The numerical ratio of distance to displacement 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 ________. 

Capacitors connected in series have ______

A body A of mass M while falling vertically downward under gravity breaks into two parts a body B of mass `"M"/2` and a body C of mass `"M"/2`. The centre of mass B and C taken together shifts compared to that of body A towards.

The amplitude and the periodic time of an S.H.M are 5 cm and 6 s respectively. At a distance of 2.5 cm from the mean position, the phase will be: 

Direction of the first secondary maximum in the Fraunhoffer diffraction pattern at a single slit is given by (a is the width of the slit):

Photoelectric emission is observed from a metallic surface for frequencies ν₁ and ν₂ of the incident light (ν₁ > ν₂). If the maximum value of kinetic energy of the photoelectrons emitted in the two cases are in the ration 1 : n then the threshold frequency of the metallic surface is ______.