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Electricity and Magnetism


1. 

The unit of electrical conductivity is

Answer : A. mho

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2. 

Two resistances 18 Ω and 6 Ω are connected to a 6 V battery in series.
Calculate
(a) the total resistance of the circuit,
(b) the current through the circuit

Answer : A. 24 Ω and 0.25 A

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3. 

Three resistances having the values 5 Ω, 10 Ω, 30 Ω are connected parallel to each other. Calculate the equivalent resistance.

Answer : A. 33.3 Ω

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4. 

One of the electrical energy consumption is equal to

Answer : A. 1000 watt per hour

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5. 

Consider the following statements:
Assertion (A) : In an electric bulb,the filament is in the form of a coiled coil
Reason (R ): A coiled coil filament occupies less space and id therefore,not cooled significantly by the convection current in the bulb.

Answer : A. Both A and R are true, but R is the correct explanation of A

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6. 

Consider the following statements:
Assertion (A) : Electric power is transmitted over long distance through conducting wires of very high voltages
Reason (R ): Then only the power can be supplied to the individual houses

Answer : A. Both A and R are true, but R is not the correct explanation of A

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