A photon is incident having frequency 1 x 10 sec^-1. Threshold frequency of metal is 5 x 10¹³ sec^-1. Find the kinetic energy of the ejected electron.

• 3.3 × 10^-21 J

• 6.6 × 10^-21 J

• 3.3 × 10^-20 J

• 6.6 × 10^-20 J

Calculate I for the given circuit diagram.

• 10 A

• 5 A

• 2.5 A

• 20 A

Find the voltage drop across a capacitor connected with a resistance and a battery of 60 V in series after a long time.

• 0V

• 60 V

• 30 V

• 38 V

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

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

109.

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