RRB GROUP D Physics Quiz

Question 1:

Direct Current produces a magnetic field similar to a permanent magnet. This magnetic field-

Is unidirectional and has a steady magnitude

Is unidirectional but its magnitude varies in a regular pattern

Has steady magnitude but changes direction in regular pattern

Changes direction and magnitude in regular pattern

Who established the wave nature of particles?

D-Broglie

Fermi

Pali

Clarke Maxwell

Which one of the following is not a property of the X-rays?

They are not deflected by magnetic fields.

They have a high penetration length in the matter.

They are deflected by electric fields.

Their wavelength is much smaller than that of visible light.

Parsec is the unit of measurement of?

density of stars

brightness of heavy bodies

astronomical distance

orbital velocity of giant stars

The length of the shadow will be longest when the-

The angle between the source of light and the object is 45℃

The Source of light and the object are parallel to each other

The Source of light and the object are perpendicular to each other

The angle between the source of light and the object is 60℃