Semiconductor Electronics: Materials, Devices and Simple Circuits — Physics STD 12 Science — Question

Mutual inductance of two coils can be increased by(a) Decreasing the number of turns in the coils(b) Increasing the number of turns in the coils(c) Winding the coils on wooden core(d) None of the above

The S.I. unit of electric flux is:

Assertion  :   An aircraft flies along the meridian, the potential at the ends of its wings will be the same.
Reason     : Whenever there is change in the magnetic flux e.m.f. induces.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

The SI unit of an electric charge is:

Intensity of magnetic field due to earth at a point inside a hollow steel box is(a) Less than outside(b) More than outside(c) Same(d) Zero

Force on any charge due to a number of other charges is the _____ of all the forces on that charge taken one at a time.

Current of 1 A is flowing through two parallel wires in the same direction and distance between the wires is 1 m . The mutual attractive force at unit length will be :

A metal plate gets heated, when cathode rays strike against, it due to (a) Kinetic energy of cathode rays(b) Potential energy of cathode rays(c) Linear velocity of cathode rays(d) Angular velocity of cathode rays