Current Electricity — Physics STD 12 Science — Question

Magnetic dipole moment is a vector quantity directed from:

Light wave is travelling along y-direction. If the corresponding   vector at any time is along the x-axis, the direction of   vector at that time is along

(a) y-axis

(b) x-axis

(c) + z-axis

(d) – z axis

Emission spectrum of CO₂​ gas:

Assertion  : Density of all the nuclei is same.

Reason      : Radius of nucleus is directly proportional to the cube root of mass number.

(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 work function of aluminium is 4.2 eV.If two photons each of energy 3.5 eV strike an electron of aluminium, then emission of electrons will be:

In a Ag voltameter 2.68 gm of silver is deposited in 10 min. The heat developed in 20Ω resistor during the same period will be

(a) 192 kJ

(b) 192 J

(c) 200 J

(d) 132 kJ

Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is

(a) 10-3 N

(b) 2.5 ×10-3 N

(c) Zero

(d) 1.5 × 10-3 N

A large nonconducting sheet M is given a uniform charge density. Two uncharged small metal rods A and B are placed near the sheet as shown in figure:

1. M attracts A.
2. M attracts B.
3. A attracts B.
4. B attracts A.

An electric potential difference will be induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction

(a)  P

(b) Q

(c)  L

(d) M

The output of the given circuit in Figure.