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Physics MCQ 20

Two field lines can never cross each other because

A wire of resistance 4Ω is stretched to twice its original length. The resistance of stretched wire would be

Kirchhoff’s junction rule is a reflection of

A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 m in a plane perpendicular to magnetic field B. The kinetic energy of the proton that describes a circular orbit of radius 0.5 m in the same plane with the same magnetic field B is

A moving coil galvanometer is an instrument which

A natural bar magnet

In induction furnace, heat is produced due to

If an AC main supply is given to be 220 V. What would be the average emf during a positive half-cycle?

If the frequency is doubled, what happen to the capacitive reactance and the current?

Which of the following current changes continuously in magnitude and periodically in direction?

Out of the following options, which one can be used to produce a propagating electromagnetic wave?

The electric field produced by the radiation coming from a 100 W bulb at a distance of 3m is (assume that the efficiency of the bulb is 2.5% and it is a point source.)

A ray of light gets reflected from the plane mirror. The incident ray and the reflected ray are perpendicular to each other. The angle of incidence is

The nearer point of hypermetropic eye is 20 cm. Find the power of lens which can be used for its correction.

Two coherent sources of light can be obtained by

If a source is at infinity, then wavefronts reaching to observer are

If the amplitude ratio of two sources producing interference is 3 : 5, then the ratio of intensities produced by each is

Which of the following can be used to control the intensity, in sunglasses, window-panes etc?

Photoemission with visible light is possible in

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is

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