Physics GK · all questions

Electricity and Magnetism
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Q421

Consider the following statements.
1. Ohm's law is not applicable at very low and very high temperature.
2. Ohm's law is applicable to semiconductor.
3. Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes.
4. Conductance is the reciprocal of resistance and ismeasured in siemens.
Which of the statements given above are correct?

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Q422

Which of the following statement(s) is/are correct?

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Q423

Which of the following has low resistivity?

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Q424

What is the resistivity of insulators?

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Q425

An electric current of 0.75A flows in a filament of an electric bulb for 10 minutes. Find the amount of electric charge flowing through the current.

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Q426

A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?

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Q427

Consider the following statements regarding a motor car battery.
1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in amperehour.
Which of the above statements are correct?

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Q428

Which of the following gases is used to fill an electric bulb?

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Q429

Assertion (A) The ferromagnetic substances do not obey Curie's law.
Reason (R) At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.

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Q430

The value of resistance of an absolute ammeter should be:

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Q431

A wire bound standard resistor uses manganin or constantan. It is because

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Q432

If the current flowing through a wire is (I) and the charge of an electron is (e), then the number of electrons flowing in (t) seconds can be determined by with the help of?

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Q433

Identify the SI unit of electrical resistance.

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Q434

Besides, . . . . . . . . non-metals are bad conductors of electricity.

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Q435

At magnetic poles, the angle of dip is

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Q436

Of the four substances mentioned in the following options, which one has the highest electrical resistivity at 20°C as compared to the other three?

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Q437

Curie-Weiss law is obeyed by iron at a temperature

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Q438

A proton and an electron are located in a uniform electric field. They will experience

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Q439

A 100W electric lamp is used 5 hours per day. How much energy will the lamp consume in 3 days?

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Q440

Which of the following does not have magnetic properties like a permanent magnet?

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