Question # 1

The restoring force is _____ and opposite to the applied force within ______,:

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Equal, elastic limit

Different, the walls of the laboratory

Different, elastic limit

None of these

The product of cross-sectional area of the pipe and the fluid speed at any pint along the pipe is

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very high

very low

constant

zero

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

The law of electromagnetic induction is related to:

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Coulomb

Ampere

Faraday

Lenz

None of these

If a force of 0.05 N produces an elongation of 20 mm in string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

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5 cm

10 cm

20 cm

25 cm

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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3

24

126

200

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

The internal energy of an ideal gas system is generally the

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translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

Referring to above figure, a changing current in coil P can be produced:

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At the instant the switch is closed

At the instant the switch is opened

With the help of rheostat

All of these

None of these

We can obtain biogas by rotting of biomass in a closed tank called

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Tanker

Container

Digester

Container

If one of the rectangular components of a vector is not zero, can its magnitude be zero

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It is zero

It if not zero

It may be negative

None of these

The limit below which the Hooke s law holds well is called

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Yield point

Breaking stress

Tensile strength

Elastic limit

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

Given that grating element = 0.2 x 10^-3cm in case of a diffraction grating. Then number of lines per centimeter will be

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500000

5000

50

5

The SI unit of stress is same as that of

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Momentum

Pressure

Force

Length

Is it possible to add a vector quantity to a scalar quantity ?

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No

Yes

Never

None of these

The field in which the work done be independent of the path followed is called

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Conservative fields

Non-conservative field

Varying intensity field

None of these

Sunset makes sky appears reddish because of:

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Diffraction of sun rays

Refraction of light

Scattering of light from dust particles

Polarization of ligth

The angle between rectangular components of a vector is

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0°

60°

90°

120°

A force applied on a body produces acceleration in

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Its opposite direction

Its own direction

Right angle to the force

None of these

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