Question # 1

Joule’s law is W=

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IR/t

IRt²

IR²t

I²Rt

The speed of sound of water at 25 ^oC is:

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1530 ms^-1

1531 ms^-1

1560 ms^-1

1570 ms^-1

What type of graph is in between V and I?

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Curved

Parabola

Straight line

None of these

For normal person audible frequency range for sound wave lies between.

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10 Hz and 10KHz

20 Hz and 20KHz

25 Hz and 25KHz

30 Hz and 30KHz

A.C generator works on the principle of:

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Electrostatic induction

Electromagnetic induction

Law of gravitation

Third law of motion

Mathematical formula of electromotive force (e.m.f) is:

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E = W/Q

E = Q/W

E = WQ

E = W2Q

the distance between two consecutive trough or crest is called:

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wavelength

frequency

time period

amplitude

One micro coulomb charge is equal to:

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10^-3c

10³c

10⁶c

10^-6c

The speed of sound in the air at one atmospheric pressure at room temperature is:

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343 ms-1

346 ms-1

349 ms-1

339 ms-1

The speed of sound is air at 21 ^oC is:

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336 ms^-1

343 ms^-1

430 ms^-1

470 ms^-1

the part of waves at which particles of the medium are below the normal position are called:

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extreme position

crest

trough

compression

Which is not an e.m.f source:

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Generator

Solar cell

Battery

Rheostat

Two uncharged objects A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of these statements is true about object A.

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredicatable

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