Physics GK · all questions

Electricity and Magnetism
practice.

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Q441

Which of the following devices is based on the phenomenon of electromagnetic induction?

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Q442

. . . . . . . . states that the total current entering a junction is equal to the total current leaving the junction.

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Q443

The torque on a rectangular coil placed in uniform magnetic field is large when the

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Q444

An electric washing machine of 750 W is used for 4 hours per day. Energy consumed by the machine in one day is . . . . . . . .

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Q445

In an electric circuit, flow of electric current is due to . . . . . . . .

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Q446

At low temperature, lead behaves as a

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Q447

What is the resistance (in Ω) of an electrical component if a current of 0.2A passes through it on application of 8 V of potential difference across it?

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Q448

Factors affecting resistance of matter:
1. Temperature
2. Nature of substance
3. Conductor length
4. Area of transverse passage

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Q449

Electricity is produced through dry cell from

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Q450

According to the Joule's law of heat, the heat generated in a circuit depends on some factors. Which of the following can be charged in this?

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Q451

Tungsten is used for the manufacture of the filament of an electric bulb because it is

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Q452

Principle of fuse is

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Q453

One of the two bulbs glows brighter than the other. Which bulb has the highest resistance?

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Q454

In the process of magnetisation of a bar,

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Q455

In a three-pin electrical plug longest pin should be connected to

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Q456

A constant current of 1.0A flows through a resistance of 12Ω. The amount of charge flows through the resistance in 1 minute is -

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Q457

If two charged objects of equal capacity are connected with a wire:

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Q458

Match the columns:

Column I	Column II
a. Smaller resistance	1. reciprocal of conductivity
b. Greater resistance	2. resistances are in series
c. Specific resistance	3. resistances are in parallel

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Q459

Which of the following is a conductor of electricity?

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Q460

Transformer converts . . . . . . . .

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