If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as

The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

A

50 %

B

60 %

C

100 %

D

150 %

Resistance of an electrical conductor is proportional to its (where, L = length and A = cross-sectional area of the conductor)

A

B

L

C

A²

D

Both A & B

একটি রোধ থার্মোমিটারের সাহায্যে পানির ত্রৈধবিন্দুর রোধ 6.7 ohm এবং কক্ষ তাপমাত্রায় রোেধ 7.5 ohm পাওয়া যায়। কক্ষের তাপমাত্রা কত হবে?

A

18.2° C

B

20.8° C

C

32.6°C

D

35.9° C

Ohm's law describes how current is related to voltage and resistance.

A

True

B

False

Which of the following is a good conductor of heat but bad conductor of electricity ?

A

Asbestos

B

Celluloid

C

Straw Board

D

Mica

When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

A

The value of current

B

The weight of the conductor

C

The direction of the conductor

D

None of the above

Which of the following is an advantage of stranded conductor over equivalent single conductor ?

A

Less liability to kink

B

Greater flexibility

C

Less liability to break

D

All of the above

If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by

A

Blv

B

Blv²

C

Bl²v

D

Bl²v²

An uncharged conductor is placed near a charged conductor, then

A

the uncharged conductor gets charged by conduction

B

the uncharged conductor gets charged by induction and then attracted towards the charging body

C

the uncharged conductor is attracted first and then charged by induction

D

it remains as such

In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.

A

bad, good

B

bad, bad

C

good, bad

D

good, good

If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as

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