Question # 1

The equivalent resistance in parallel combination is:

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R_c=R₁+R₂+R₃ +.................+R_n

R_c=1/R₁+1/R₂+1/R₃+.................+1/R_n

a and b

None of these

The unit of resistance is:

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Ω-m

Ω

V

C

Specific resistance of silver = ________ x 10^-sOhm-meter

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5.25

2.75

1.69

1.62

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Mirror

Lens

In medical field, C.R.O is used to display:

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Heart beats

Pictures of organs

Pictures of bones

Blood pressure

The more negative potential of grid, the more electrons will be:

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Attracted

Repelled

Attracted as well as repelled

Neither attracted nor repelled

In mathematical form of Ohm's law, "R" is:

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Resistance

Specific resistance

Resistor

Resistivity

What happens to the intensity of the brightness of the lamps connected in series as more and more lamps are added?

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Increases

Decreases

Remains the same

Can not be predicted

The S.I unit of electric power is:

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Volt

Watt

Ampere

Joule

The sensation of sound persists in our brain for:

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0.1 sec

0.01 sec

1 sec

10 sec

An object is placed at the Centre of curvature of a concave mirror. The image produced by the mirror is located:

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

The speed of sound in a liquid is …………..than that in gases:

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Ten times

Fifteen times

Five times

Two times

Which type of image is produced by the converging lens of human eye if it views a distant object:

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminished

Virtual, inverted, magnified

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