### Current electricity in physics

Choose the appropriate option.

#### Question 1. The main power supply in India is at 220 V, whereas that in the US is at 110V. Which one among the following statements in this regard is correct?

 110 V is safer but more expensive to maintain. (NA)

 110 V is safer and cheaper to maintain. (NA)

 110 V leads to lower power loss (NA)

 110 V works better at higher latitudes. (NA)

Choose the appropriate option.

#### Question 2. The resistance of a wire is 10Ω if it is stretched ten times, the resistance will read

 1 Ω (NA)

 10 Ω (NA)

 100 Ω (NA)

 1000 Ω (NA)

Choose the appropriate option.

#### Question 3. In India, distribution of electricity for domestic purpose is done in the form of

 220V, 50Hz (NA)

 110V, 60Hz (NA)

 220V, 60Hz (NA)

 110V, 50Hz (NA)

Choose the appropriate option.

#### Question 4. When an electrical safety fuse is rated (marked)as 16A, it means it

 will not work, if current is less than 16A (NA)

 has a resistance of 16Ω (NA)

 will work if the temperature is more than 16°C (NA)

 will be blown (break) if current exceeds 16A (NA)

Choose the appropriate option.

#### Question 5. Ohm’s law defines

 a resistance (NA)

 current only (NA)

 voltage only (NA)

 Both current and voltage (NA)

Choose the appropriate option.

#### Question 6. A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e. VI may be understood as

 resistance R (NA)

 heat generated by the circuit (NA)

 thermal power radiated by the circuit (NA)

 rate of change of resistance (NA)

Choose the appropriate option.

#### Question 7. A current of 0.5 A is drawn by a filament of an electric bulb for 20min. the amount of electric charge that flows through the circuit is

 1C (NA)

 10C (NA)

 600C (NA)

 300C (NA)

Choose the appropriate option.

#### Question 8. Ohm’s law can also be taken as a statement for

 conservation of energy (NA)

 conservation of electric charge (NA)

 conservation of angular momentum (NA)

Choose the appropriate option.

#### Question 9. An electric heater is rated 150W, electric power costs Rs 2 per kWh, then the cost of power for 10h running the heater is

 L30 (NA)

 L15 (NA)

 L150 (NA)

 L25 (NA)

Choose the appropriate option.

#### Question 10. During short circuiting, the current flowing in the electrical circuit

 reduces substantially (NA)

 does not change (NA)

 increases instantaneously (NA)

 varies continuously (NA)

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