Question # 1

A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

The minimum distance from eye at which an object appears to be distinct is

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Near point

Focal length

Image distance from lens

Object distance from lens

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

Which is the example of vector quantity

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Torque

Speed

Density

Work

The ballistic missiles are used only for

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Long range

Short range

Medium range

Constant range

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

For 2.450 no. of significant digits.

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2

1

3

4

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

One complete round trip of a vibrating body is called.

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Frequency

Time period

Vibration

Amplitude

The ratio of the velocities of wate in a pipe lying horizontally at two ends is 1 : 4 The ratio of diameters of pipe at these two ends is.

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1 : 2

2 : 1

1 : 4

4 : 1

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

Name the quantity which is a vector.

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Speed

Force

Temperature

Density

The SI unit of product of pressure and volume is.

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_Watt

Joule

Pascal

Newton

The final image seen through ey piece in telescope is.

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Real, enlarge and inverted

Vertual, enlarge and erect

Virtual, enlarge and inverted

In Real, enlarge and erect

100 radians are equal to.

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57.3^o

75.3^o

573^o

5730^o

10 waves pass through a point in 2 seconds with speed 10 ms-1 the frequency of wave will be

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1 Hz

2 Hz

5 Hz

10 Hz

The weight of the body at the centre of earth is

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Maximum

Minimum

Zero

Infinite

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

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