Electric Charges and Fields — Physics STD 12 Science — Question

The current gain of a transistor in common base mode is 0.995. The current gain of the same transistor in common emitter mode is?

The neutron was discovered by:

In YDSE, the slit widths are in the ratio of 1:9. The ratio of intensity of the maxima to that of the minima is:

If the plates of a parallel plate charged capacitor are not parallel, the interface charge density is:

Size of nucleus:

Assertion  :   A circular loop carrying current lies in XY plane with its center at origin having a magnetic flux in negative Z-axis.
Reason      : Magnetic flux direction is independent of the direction of current in the conductor.(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.

Two streams of protons move parallel to each other in the same direction. They will:

Choose the correct statement(a) When we heat a semiconductor its resistance increases (b) When we heat a semiconductor its resistance decreases (c) When we cool a semiconductor to 0 K then it becomes super conductor(d) Resistance of a semiconductor is independent of temperature