Current Electricity — Physics STD 12 Science — Question

The specific heat capacity of a body depends on:

1. The heat give.
2. The temperature raised.
3. The mass of the body.
4. The material of the body.

A horizontal circular loop carries a current that looks clockwise when viewed from above. It is replaced by an equivalent magnetic dipole consisting of a south pole S and a north pole N:

1. The line SN should be along a diameter of the loop.
2. The line SN should be perpendicular to the plane of the loop.
3. The south pole should be slow the loop.
4. The north pole should be below the loop.

The continuous X-rays spectrum produced by an X-ray machine at constant voltage has

(a) A maximum wavelength	(b) A minimum wavelength
(c) A single wavelength	(d) A minimum frequency

The binding energy of nucleus is a measure of its

(a) Charge

(b) Mass

(c) Momentum

(d) Stability

In the circuit, the reading of the ammeter is (assume internal resistance of the battery be zero)

(a)

(b)

(c)

(d) 2 A

When  electrons are removed from a neutral metal plate,  the electric charge on it is

(a) – 1.6 C

(b) + 1.6 C

(c) 10 +19 C

(d) 10–19 C

The negative of the work done by the conservative internal forces on a system equals the change in:

1. T​​​​​otal energy.
2. Kinetic energy.
3. Potential energy.
4. None of these.

In a cathode ray tube, what is the effect on the beam of particles if the anode voltage is increased ?

The electric potential inside a conducting sphere

(a) Increases from centre to surface

(b) Decreases from centre to surface

(c) Remains constant from centre to surface

(d) Is zero at every point inside