Question # 1

X-ray diffraction has been very useful in determining the structure of

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Hemoglobin

Stars

Galaxies

Stones

In case of point source the shape of wave front is.

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Plane

spherical

Circular

Eliptical

Unit of acceleration is

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ms-1

ms

ms-2

m2s

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

The efficiency of a Carnot Heat Engine is 100% if temperature of sink T2 is.

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0 ^oC

0 K

0 ^oF

100 K

In stationary waves, the velocity of particle at the node is.

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Maximum

Infinite

Zero

Varible

Multimode step index fibre is useful for

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Long distances

Short distances

Better quality

Low price

The term in Bernoulli's equation has the same unit as

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Work

Volume

Pressure

Force

Change of momentum is equal to

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Force

Tension

Impulse

Pressure

At which place the motion of a simple pendulum will be slowest.

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Karachi

K-2

Murree

Lahore

The angle of projection for which its maximum height and horizontal range are equal

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46 ^o

56^o

66^o

76^o

In the thermodynamics process , the equation W = -delta U represents.

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

The area between velocity time graph and the time axis is numerically equal to.

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?Speed of object

Distance covered by the object

Average velocity of the object

Acceleration of the object.

The commercial unit of electric energy is

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Kilo watt hour

watt

Watt hour

Kilo Watt

The magnifying power of a convex lens of focal lendth 10 cm is

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7

9.6

11

3.5

According to Hygen's principle, each point on a wave front acts as a source of.

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Secondary wavelet

New wave front

Sound

Primary wavelet

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

The frictional force is

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Conservative force

Non conservative force

Electric force

Magnetic force

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