Atoms — Physics STD 12 Science — Question

The current flowing in a copper voltameter is 1.6 A. The number of  ions deposited at the cathode per minute are

(a) 1.5

(b) 3

(c) 6

(d) 1

6 A particle of charge q and mass m moves rectilinearly under the action of electric field E = A – Bx, where A and B are positive constants and x is distance from the point where particle was initially at rest then the distance travelled by the particle before coming to rest and acceleration of particle at that moment are respectively:

The positive temperature coefficient of resistance is for

(a) Carbon

(b) Germanium

(c) Copper

(d) An electrolyte

Two light beams superimposed each other constructively this results in:

By keeping a conductor in an external electric field and from the result obtained by electrostatics, which of the following options is wrong?

A varying current in a coil changes from 10 amp to zero in 0.5 sec. If average EMF is induced in the coil is 220 volts, the self inductance of coil is

(a) 5 H

(b) 10 H

(c) 11 H

(d) 12 H

Assertion   :  Coloured spectrum is seen when we look through a muslin cloth.

Reason       : It is due to the diffraction of white light on passing through fine slits.

(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.

In which of the following situations, the heavier of the two particles has smaller de Broglie wavelength? The two particles:

1. Move with the same speed.
2. Move with the same linear momentum.
3. Move with the same kinetic energy.
4. Have fallen through the same height.

In an induction coil, the secondary e.m.f. is

(a) Zero during break of the circuit

(b) Very high during make of the circuit

(c) Zero during make of the circuit

(d) Very high during break of the circuit

Two long straight parallel conductors separated by a distance of 0.5m carry currents of 5A and 8A in the same direction. The force per unit length experienced by each other is

(a) 1.3  (attractive)	(b) 1.6   (repulsive)
(c) 16  (attractive)	(d) 16  (repulsive)