Question # 1

If the stream lines of fluid are forced closer together then.

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Speed of the fluid increases

Speed of the fluid decreases

Pressure of the fluid increases

Speed of the fluid remain same

The sum of two or more vectors will be a single vector called

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Component vector

Position vector

-ve vector

Resultant vector

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

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The equations of motion hold good for

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Variable acceleration

Uniform acceleration

Centripetal acceleration

All of these

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

According to Huygen's principle the points on primary wave front can be considered as

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Secondary wavelets

Ray of light

Source of light

None of these

When a body is whirled in a horizontal circle by means of string, the centripetal force is supplied by

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Mass of body

Velocity of a body

Tension in the string

Centripetal acceleration

Biomas is a potential source of

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Renewable energy

Non renewable energy

Botha a and b

Tidal energy

The speed of sound increases with the increase of in

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Pressure

Volume

Temperature

Density

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

The value of solar constant.

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1.4 kW m-2

1.0 kW m-2

1.6 kW m-2

2 kw m-2

If 332 waves pass through a medium in 1 second with speed of 332 ms-1 then wavelength will be

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7 m

332 m

664 m

1 m

The distance between the consecutive nodes is

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Two tunign forks of frequencies 260 Hz and 256 Hz are sounded together , the number of beats per second is.

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2

258

516

4

The least distance of distinct vision for the normal eye is.

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15 cm

25 cm

125 cm

25 m

The frequency of waves produced in microwave oven is

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1435 Hz

2450 MHz

1860 MHz

2850 Hz

According to Newton's formula, the speed of sound in air at STP is

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332 ,ms-1

340 ms-1

350 ms-1

280 ms-1

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