When three identical bulbs are connected in series, the consumed power is 1010 W. If they are now connected in parallel then the consumed power will be:
1. 3030 W
2. 9090 W
3. 103103 W
4. 270270 W
In a hot wire ammeter due to the flowing of the current, the temperature of the wire is increased by 5∘5∘ C. If the value of the current is doubled, then the increase in temperature will be:
1. 15∘15∘ C
2. 20∘20∘ C
3. 25∘25∘ C
4. 30∘30∘ C
The current in 8 Ω8 Ω resistance is (in the figure below):
1. 0.690.69 A
2. 0.920.92 A
3. 1.301.30 A
4. 1.61.6 A
If the power dissipated in 5 Ω5 Ω is 2020 W then the power dissipated in 4 Ω4 Ω is:
1. 44 W
2. 66 W
3. 1010 W
4. 2020 W
The terminal potential difference of a cell is greater than its emf when:
1. | A battery of less emf is connected in its series. |
2. | A battery of higher emf is connected in its series. |
3. | A battery of higher emf is connected in its parallel. |
4. | A battery of less emf is connected in its parallel. |
The net resistance of the circuit between AA and BB is:
1. 83 Ω83 Ω
2. 143 Ω143 Ω
3. 163 Ω163 Ω
4. 223 Ω
A car battery of emf 12 V and internal resistance 5×10−2 Ω receives a current of 60 A from an external source. The terminal voltage of the battery is:
1. | 12 V | 2. | 9 V |
3. | 15 V | 4. | 20 V |
If there are two bulbs of (40 W,200 V), and (100 W,200 V), then the correct relation for their resistance is:
1. R40<R100
2. R40>R100
3. R40=R100
4. no relation can be predicted
According to the Faraday Law of electrolysis, the mass deposited at electrode will be proportional to:
1. m ∝ I2
2. m ∝ Q
3. m ∝ Q2
4. 'm' does not depend on Q