Question # 1

A constant temperature, if pressure of a given mass of gas is halved, then its volume becomes.

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Halve

Doubled

Four time

Constant

The numer of significant figureswith the increases accracy of the measuring instrument

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Decreases

Remains unchanged

Increasees

None of these

A body has P.E. = mgh, when it is at height 'h' from the ground. At the point at the distance 'x' below from the top its P.E. with

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mgh

mgx

mg(x-h)

None of these

The wavelength of fundamental note in one end closed pipe in term of length 'l' of pipe is.

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4 l

2l

l

1/4 l

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

The acceleration of a projectile along x axis is.

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Zero

Increase

Decrease

Equal to 'g'

Dot product of vector with itself is.

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Zero

2 A

A²

A

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

Which of the following is evidence of wave nature of light

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Interference

Diffraction

Polarization

All of these

Let A = Area of cross section of pipe, v = speed of fluid, then 'Av' is called.

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Volume flow rate

Energy flow rate

Mass flow rate

Pressure flow rate

Pressure of fluid will be low where speed of fluid is.

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Low

Zero

High

Constant

The SI unit of work is

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Newton

Joule

Mol

Calorie

A quantity which indicates the state and direction of a vibrating body is known as

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Time period

Amplitude

Phase

Frequency

The actual efficiency of property turned petrol engine is.

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20% to 30%

30% to 35%

40% to 45%

25% to 30%

The optical fiber is covered for protection by a

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Glass Jacket

Plastic Jacket

Copper Jacket

Aluminum Jacket

If the object is at 5 cm from the lens of simple microscope than its magnifying power will be.

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5

10

15

25

when a ball is throng straight up, the acceleration at its highest point is.

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Upward

Down ward

Zero

Horizontal

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

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