Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

The resistance of 1 A ammeter is 0.018 Ω . To convert it into 10 A ammeter, the shunt resistance required will be

(a) 0.18 Ω

(b) 0.0018 Ω

(c) 0.002 Ω

(d) 0.12 Ω

A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if:

1. It is translated.
2. It is rotated about its axis.
3. It is rotated about a diameter.
4. It is deformed.

In the figure, shown the magnetic induction at the centre of there arc due to the current in portion AB will be

(a)

(b)

(c)

(d) Zero

When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms^–1)

(a) 3

(b)

(c)

(d) 0.5

Assertion   :   Two bulbs of same wattage, one having a carbon filament and the other having a metallic filament are connected in series. Metallic bulbs will glow more brightly than carbon filament bulb. 

Reason      : Carbon is a semiconductor.

(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.

For a series LCR circuit the power loss at resonance is : -

The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing

(a) North

(b) South

(c) East

(d) West

If the momentum of a photon is p, then its frequency is (Where m is the rest mass of the photon)

(a)

(b)

(c)

(d)

Assertion :  Diamond glitters brilliantly.

Reason    : Diamond does not absorb sunlight.

(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 parallel conductors A and B of equal lengths carry currents I and 10 I, respectively, in the same direction. Then

(a) A and B will repel each other with same force

(b) A and B will attract each other with same force

(c) A will attract B, but B will repel A

(d) A and B will attract each other with different forces