Question # 1

If rope of lift breaks suddenly. The tension exerted by the surface of lift is (a=Acceleration of lift)

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mg

m (g+a)

m (g - a)

0

Decibel is unit of

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Intensity of light

x-ray radiation capacity

sound loudness

Energy of radiation

Which of the following options states the names of fluids in the order of increasing viscosity?

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mercury, motor oil, methanol

methanol, mercury, motor oil

motor oil, mercury, methanol

methanol, motor oil, mercury

When the surfaces are coated with a lubricant, then they

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Stick to each other

Slide upon each other

Roll upon each other

None of these

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

Direction of motion ______ in circular motion:

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Changes off and on

Changes continuously

Does not change

None of them

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

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200 W

302.5

250 W

350 W

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

The branch of physics which deals with the properties of fundamental particles is called:

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High energy physics

Molecular physics

Astrophysics

Space physics

A vector of magnitude 5 N is added to a vector of magnitude 8 N while the orientations are changeable. Range of their possible sum will be very from:

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Zero to 3 N

1 N to 13 N

13 N to 3 N

None of these

Electric flux depends upon

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The charge only

Medium only

Both charge & medium

Permittivity & area

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

An electric field lines provides the information about

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Electric force

Direction

Medium

All of them

The measure of deformation of a solid when stress is applied to it is called

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Strain

Stress

Force

None of these

The turning effect of a force is called:

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Acceleration

Torque

Velocity

Momentum

Petrol engine converts heat energy to work roughly

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20%

25%

30%

40%

Under the elastic region, the deformation produced in the material is

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permanent

temporary

either of them

none of them

The terminal velocity of a drop of water of radius 1 x 10^-3 m moving through air (Given that h = 19 x 10^-6 kgm^-1s^-1)

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114.6 ms^-1

114.6 kms^-1

11.46 ms^-1

1.146 ms^-1

Bulk modulus for diamond is

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250

540

695

714

Identify the incorrect statement

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The distance between the objective and eye-piece is 16.02 cm

The angular magnification of the planet is 800

The image of the planet is inverted

The objective is larger than the eye-piece

A telescope has an objective of focal length 10 cm the magnifying power of telescope is 5.Its length in normal adjustment is

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7.5cm

10.5 cm

12 cm

15 cm

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