VITEEE Physics Test - 3

Current flows in the semi-conductors through

A 2μ F capacitor is charged to 100 volt and then its plates are connected by a conducting wire. The heat produced is

A 4 V battery of internal resistance 1 Ω sends a current through a 3 Ω resistor. The terminal potential difference is

x g of Ag is deposited by passing 4 A of current for 1 hour. How many gram of Ag will be deposited by passing 6 A for 40 min?

The maximum current that flows through a fuse wire before it blows out varies with its radius r as

Which of the following is a non-ohmic resistor?

Consider telecommunication through optical fibres. Which of the following statements is not correct

When a proton is accelerated with 1 volt potential difference, then its kinetic energy is

What is increased in a step-down transformer

A conductor rod of length L rotates with angular speed ω in a uniform magnetic field of induction B which is perpendicular to its motion. The induced e.m.f developed between the two ends of the rod is

The induced e.m.f. produced in the primary and secondary coils is 2 mV and 5 mV respectively. If the rate of change of current is 20 A-s^-1, then coefficient of mutual induction of the secondary coil is

Which of the following rays are not electromagnetic wave?

A sphere S₁ of radius r₁ encloses a total charge Q. If there is another concentric sphere S₁ of radius r₂ > r₁ and there be no additional charges between S₁ and S₂, the ratio of electric flux through S₁ and S₂ is

An electron of charge e coulomb passes through a potential difference of V volt. Its energy in joule will be

Equal charges are given to two conducting spheres of different radii. The potential will

An electric dipole consists of two opposite charges of magnitude  +_- q seperated by 2a. When the dipole is placed in uniform electric field E, to have minimum potential energy, then dipole moment p makes which the following angle with E

The capacitance of a parallel plate capacitor is 10 μF when distance between its plates is 8 cm. If distance between the plates is reduced to 4 cm, its capacitance will be

A cyclotron can not accelerate

The difference between the mass of a nucleus and the total mass of the constituents is its

A body of mass 1g and carrying a charge 10^-8 C passes from two points P and Q. P and Q are at electric potentials 600V and 0V respectively. The velocity of the body at Q is 20 cm s^-1 . Its velocity in ms^-1 at P is

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

Stopping potential for photoelectrons

When the photons of energy hv fall on a photo-sensitive surface (work function hv₀) electrons are emitted from the metallic surface. This is known as photoelectric effect. The electron coming out of the surface have a kinetic energy. Then it is possible to state that

The magnifying power of a simple microscope M is given by

A prism is made up of material of refractive index √ 3 . The angle of the prism is A. If the angle of minimum deviation is equal to the angle of the prism, then the value of A is

The region near the junction of p - n diode where there are no charge carriers is called

In a properly biased transistor

In P-type semiconductor, there is

A hole in a p-type semiconductor is

Three semi-conductors are arranged in the increasing order of their energy gap as follows. The correct arrangement is

When distance between source of light and observer decreases, then the apparent frequency of light

Laser light is considered to be coherent as it consists of

When two coherent monochromatic light beams of intensities I and 4I are superimposed, the ratio between maximum and minimum intensities in the resultant beam is

Both light and sound waves produce diffraction. It is more difficult to observe the diffraction with light waves because