NTPC CBT-2 Physics Quiz

Question 1:

Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the-

Length of magnet

Thickness of magnet

Degree of closeness of the field.

Resistance offered by the surroundings

Who among the following is a pioneer in discovering the heating effect of electric current?

Isaac Newton

Galileo Galilei

James P. Joule

J.J. Thomson

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 a regular pattern

Changes direction and magnitude in a regular pattern

Which of the following lenses are used in flashlights?

Concave Lens

Convex Lens

Plane Mirror

Both 1 and 3

What are the three elements of a bipolar transistor?

Grid, Plate, Cathode

Suppressor, Deflector, Target

Energizer, Controller, Terminus

Emitter, Base, Collector