NEET Mock Test - 15 - NEET MCQ

A particle of mass m is executing uniform circular motion on a path of radius r. If p is the magnitude of its linear momentum. The radial force acting on the particle is

The potential difference between two electrodes of a galvanic cell, in an open circuit, is known as

An electron remains undeflected when passing perpendicular to mutually perpendicular electric and magnetic fields. If the magnetic field is 8 Gauss and elecric field is 4000 V/m, the velocity of the electron is

The resistance of a conductor increases with

Which of the following is deflected by electric field ?

When ultraviolet rays are incident on a metal plate, then the photoelectric effect does not occurs. It occurs by the incidence of

When wavelength of incident photon is decreased upon

If work function of metal is 3 eV then threshold wavelength will be

In an A.C. circuit, a resistance of R Ω is connected in series with an inductance L. If phase angle between voltage and current is 45°, the value of inductive reactance will be

What is the cause of "Green house effect"?

Which of the following rays are not electromagnetic wave?

The electric field inside a charged conductor of radius r is

A 2μF condenser is charged to 500V and then its plates are joined through of consistance. The heat produced in the resistance in joules is

The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is V. For a satellite orbiting at an altitude of half of the earth's radius, the orbital velocity is

Two metal rods A and B of equal lengths and equal cross sectional areas are joined end to end. The coefficients of thermal conductivities of A and B are in the ratio 2:3 when the free end of A is maintained at 100°C and the free end of B is maintained at 0°C, the temprature of the junciton is

The average kinetic energy of a gas molecules at 27°C is 6.21x10²¹ J. Its average kinetic energy at 227°C will be

A block has been placed on an inclined plane with the slope angle θ, block slides down the plane at constant speed. The coefficient of kinetic friction is equal to

A cyclotron oscillator frequency is 10 MHz. If radius of its dees 60 cm, then magnetic field for accelerating the protons is (Given e = 1.6 x 10^-19C, mp = 1.67 x 10^-27 kg)

A magnet of magnetic moment M is cut into two equal parts. The two parts are placed perpendicular to each other so that their north poles touch each other. The resultant magnetic moment is

Three identical bar magnets are placed in the form of an equilateral triangle with north pole of one touching the south pole of the other as shown in fig. The net magnetic moment of the system is

The force of cohesion is maximum in

Two wires of the same material and length, but diameters in the ratio 1 : 2 are stretched by the same force. The elastic potential energy stored per unit volume for the two wires when stretched, will be in the ratio of

Why high temperature is required for fusion reaction?

If 200 Mev energy is released in the fission of a single nucleus of 92 U 235 , how many fissions must occur per second to produce a power of 1 kW?

α- particle is equivalent to

The potential energy of a particle executing simple harmonic motion at a distance y from its equilibrium position is

According to the modern theory for nature of light, the light has