Question # 1

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

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

Mathematical relationship between critical angle "C" and refractive index "n" is:

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N = C

N = 1 / sin c

N = 1 / cos c

N = 1 / sin2 c

The waves which travel in straight line through space and have strong signals are called:

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Micro waves

Mechanical waves

Light waves

Magnet waves

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

i) Wavelength ii) Period iii) Amplitude

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i only

(iii) only

i and ii only

i and iii only

The value of acceleration is simple harmonic motion at mean position is:

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Maximum

Zero

10 N

Both a and b

The direction of electric field lines due to positive charge is:

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A way from the charge

Towards the charge

Both a and b

None of these

The combined resistance of two identical resistors, connected in series is 8Ω. Their combined resistance in a parallel arrangement will be:

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2Ω

4Ω

8Ω

12Ω

the waves have properties:

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reflection

refraction

diffraction

all of these

One joule per coulomb is called:

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Volt

Farad

Ampere

Tesla

Each volt of lightening contains energy:

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4x10⁶ joules

1000 joules

1000 million joules

10 joules

The resistance of conductors is due to:

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Protons

Fixed atoms

Molecules

Neutrons

The digits used in electronics are:

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1

0

0 and 1

1 and 2

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