Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Three capacitors of capacitance 1 mF, 2 mF and 3 mF are connected in series and a potential difference of 11 V is applied across the combination. Then, the potential difference across the plates of 1 mF capacitor is

(a) 2 V

(b) 4 V

(c) 1 V

(d) 6 V

The electrical conductivity of pure germanium can be increased by:

An LR circuit with a battery is connected at t = 0. Which of the following quantities is not zero just after the connection?

1. Current in the circuit.
2. Magnetic field energy in the inductor.
3. Power delivered by the battery.
4. Emf induced in the inductor.

When a proton moves in a uniform magnetic field, the momentum change but its kinetic energy does not change because:

Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several

(a) Protons and positrons	(b) a - particles
(c) Neutrons	(d) Protons and a-particles

Photocell is based on :

A galvanometer can be used as a voltmeter by connecting a

(a) High resistance in series	(b) Low resistance in series
(c) High resistance in parallel	(d) Low resistance in parallel

When subjected to a transverse electric field, cathode rays move

(a) Down the potential gradient	(b) Up the potential gradient
(c) Along a hyperbolic path	(d) Along a circular path

Work done to bring a unit positive charge from infinity to a point in an electric field is known as _______?

Approximate height of ozone layer above the ground is

(a) 60 to 70 km

(b) 59 km to 80 km

(c) 70 km to 100 km

(d) 100 km to 200 km