A galvanometer has a current sensitivity of  1 mA  per division.  A variable shunt is connected across the galvanometer and the combination is put in series with a resistance of 500 Ω  and cell of internal resistance 1 Ω  It gives a deflection of 5 division for shunt of 5 ohm and 20 division for shunt of 25 ohm. The emf of cell is

• 47.1 V

• 57.1 V

• 67.1 V

• 77.1 V

322.

In the circuit shown, current flowing through 25 V cell is

   

• 7.2 A

• 10 A

• 12 A

• 4.2 A

Assertion:  It is advantageous to transmit electric power at high voltage.

Reason: High voltage implies high current.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

The dimensions of specific resistance are

• [ M L² T^-2 A^-1 ]

• [ M L³ T^-3 A^-2 ]

• [ M L³ T^-2 A^-1 ]

• [ M L² T^-2 A^-2 ]

Assertion: The dimensional formula for product of resistance and conductance is same as for dielectric  constant.

Reason: Both have dimension of time costant. 

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

A bulb of 25 W. 200 V and another bulb of 100 W, 200 V are connected in series with a supply line of 220 V. Then

• both bulbs will glow with same brightness

• both bulbs will get fused

• 25 W bulb will glow more brightly

• 100 W bulb will glow more brightly

Assertion:  A bird perches on a high power line and nothing happens to the bird.

Reason:  The level of bird is very high from the ground.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion: In the following circuit, emf is 2 V and internal resistance of the cell is I Ω and R= 1 Ω, then reading of the voltmeter is 1 V.

Reason:  V = E $-$ IR where  E = 2V, I = 2/2 = 1A

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion:  A domestic electrical appliance, working on a three pin will continue working even  if the top pin is removed. 

Reason: The third pin is used only as a safety device.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion:  Ferro magnetic substances become paramagnetic above Curie temperature. 

Reason:  Domains are destroyed at high temperature.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false