Question # 1

The electrostatic force acting on two charges each of 1 C separated by 1m is about .

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9 x 10⁹ N

9 x 10^-9N

9 x 10⁸N

9 x 10^-8N

Five joules of work is needed to shift 10 C of charge from one place to another. The potential difference between the places is:

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0.5 V

2 V

5 V

10 V

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

In case of OR and AND operation, if switches s₁ and s₂ both are open then lamp is:

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On

Off

Sometimes on and sometimes off

Neither on nor off

SI unit of capacitance is:

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Joule

Volt

Watt

Farad

The coulomb's law is valid for the charges which are:

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moving and point charges

moving and non-point charges

stationary and pont charges

stationary and large size charges

Intensity level of the sound produced by mosquito buzzing is:

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70 dB

40 dB

10 dB

120 dB

When frequency of sound wave is increased, which of the following decreases:WavelengthPeriodAmplitude

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(i) Only

(iii) Only

(i) And (ii) only

(i) And (iii) only

Who developed the 1st practical electric battery:

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Alessandro volta

Faraday

Newton

None of these

If a charged body is brought near a negatively charged electroscope and the leaves of electroscope diverge, then the body is:

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Positively charged

Negatively charged

Neutral

None of these

Capacitance is defined as:

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VC

Q/V

QV

V/Q

X=A.B. This equation is used for which operation:

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AND

OR

NOT

NAND

The speed of sound in air at 0°C is:

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331ms^-1

376ms^-1

231ms^-1

386ms^-1

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