NEET Mock Test - 10 - NEET MCQ

Emission of electrons in the photoelectric effect is possible, if

What will be the ratio of the de Broglie wavelengths of proton and α particle of same energy ?

In a place where electric field E and magnetic field B are finite, a charged particle projected along x-axis with speed v passes undeflected and with uniform speed. We may conclude that

Two inclined plane have same height but different lengths (and therefore different angles). If a solid sphere is allowed to roll down from the top of these inclined planes

What is the unit for specific resistivity ?

Two identical cells of the same emf and same internal resistance give the same current through an external resistance of 2 Ω, regardless of whether they are connected in series or parallel. The internal resistance of the cell is

A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV. Minimum value of reverse potential to be applied for stopping the emission of electrons is

De-Broglie equation states the

Three identical rings move with the same speed on a horizontal surface in a uniform horizontal magnetic field, normal to the planes of the rings. If the first slips without rolling, the second rolls without slipping and the third rolls with slipping with the same speed, then

Heat radiations propagate with the speed of

In an electromagnetic wave, the electric and magnetising fields are 100 Vm^-1 and 0.265 Am^-1. The maximum energy flow is

Two electric charge 12μC and − 6μC are places 20 cm apart in air. There will be a point P at which electric potential is zero on the line joining these two charges and outside, excluding the region between them. The distance of P from − 6 μ C charge is

An electric dipole of dipole moment p is placed in uniform electric field of strength E. If θ is the angle between p and E, then potential energy of the dipole becomes maximum, when θ is

A space-craft is launched in a circular orbit very close to the earth. What additional velocity should be given to the space-craft, so that it might escape from the earth's gravitational pull? (Radius of the earth = 6400 km; g = 9.8 m-s⁻²)

On a cold morning, a metal surface will feel colder to touch than a wooden surface because

Gas exerts pressure on the walls of the container because

Five forces inclined at an angle of 72° to each other are acting on a particle of mass m placed at origin of co-ordinates. Four forces are of magnitude F₁ and one of F₂. Find resulting acceleration of particle

The net charge on a current carrying conductor is

In a deflection magnetometer experiment the deflections produced separately by two short bar magnets kept at the same distance are 45° and 30° . Then the ratio of the magnetic moments of the two magnets is

A magnetic needle suspended freely orients itself

In streamline flow, if gravitational head is h, then pressure and kinetic heads are

A wire of length L and radius a rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in it length is l. If another wire of same material but of length 2L and radius 2a is stretched with a force 2F, the increase in its length will be

In a fission of U²³⁵ nucleus on average ----- neutrons are released.

A heavy nucleus at rest breaks into two fragments which fly off with velocities 8:1. The ratio of radii of the fragments is

A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 min, the rate is 1250 disintegrations per min. Then, the decay constant (per minute) is

A body of mass 2 kg is made to oscillate with an angular frequency 4 rad-s⁻¹ on a spring. The force constant of the spring is

Light is incident on a glass plate at an angle of 60°. If reflected and refracted rays are mutually perpendicular, then refractive index of the glass plate is