Question # 1

A point source of light is situated at large distance The nature of the wave front at the point will be.

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Cylindrical

Spherical

Plane

Ellipical

Which are different types of emission spectrum

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Continues spectrum

Line spectrum

Band spectrum

all of the above

Since a diode permits the flow of current only in one direction so it can be used as.

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An oscillator

A rectifier

A phot deflector

A transistor

Prof. Abdul Salam was awarded Novel prize in

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1970

1972

1979

1983

If an object moves with velocity of light the apparent mass of the object as compared to list original mass is

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greater

Smaller

Same

zero

Loss of power is optical fibre result into

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Poor receipt ion of signals

Delay in time for reception of signals

accurate information at the receivers

All of the above

What would be the magnitude and direction of acceleration which would made the spring balance reading zero.

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Zero

1 m s-2 upward

9.8 m s-2 upward

9.8 m s-2 downward

The sun appears elliptical before sunset due to

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Reflection

Refraction

Scattering

Total internal reflection

If the number of gas molecules in a cubical vessel is increase from N to 3 N then its pressure and total energy will be.

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Half

Three times

Double

Four times

In scattering experiment which force scatters alpha particle.

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Nuclear force

Coulomb's force

Gravitational force

Centripetal force

Which of the following is the cause of failure of a lens to form a sharp and district image of a white object.

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Spherical aberration

Chromatic aberration

Distortion

Astigmatism

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

The SI unit of current gain is.

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Ampere

Ampere metre

Ampere volt

It has no unit

The pascal is not the SI derived unit of.

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Pressure

Stress

work

Tensile strength

Which one of the following scientists got Noble prize due to his work of combining two basic forces of nature.

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Dr. Abdul Qadeer khan

Dr. Abdul Salam

Dr. Muhammad ishfaq

Dr. Mubarak mund

The maximum energy of emitted photoelectron is measured by

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the largest potential difference they can traverse

The current they produce

The potential difference they produce

The speed with they emerge

An AND gate is.

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Equivalent to a series switching circuit.

Equivalent to a parallel switching circuit

Equivalent ot universal gate

A reciprocal of NAND gate

Which of the following is not SI base unit.

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kilogram

Ampere

Coulomb

Mole

Why choke coil is used in an AC circuit.

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To decrease D.C.

To increases A.C.

To decreases A.C

To increase D.C

Viscosity of fluids with rise in temperature.

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Increases

Decreases

Remains constant

Vanishes

Which of the following physical quantity has different units as compared to others.

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Weight of a body

Tension of a string

Buoyant force

Electromotive force

A wire stretches 8 mm under a load of 60 N A second wire of the same material with half the diameter and a quarter of the original length of the first wire, is stretched by the same load What is the extension of the wire.

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1 mm

4 mm

8 mm

16 mm

Which type of microscope was the first to be developed.

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Optical microscope

Digital microscope

Electron microscope

All were developed at the same time

Induced fission result from the absorption of

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electron

Proton

Nucleon

Neutron

A force of 100 N acts on body of mass 5 kg for 10 s. The velocity of the body will be.

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2 ms -1

20 m s-1

200 ms-1

2.000 m s-1

Viscosity in fluid refers to

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The density of a fluid

the compressibility of a fluid

Tangential force exerted on solid surface by the flowing fluid

Normal forces exerted on solid surace by the following fluid

The ration of intensity of magnetization to the magnetic force is known as.

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Parmeability

Magnetic induction

Magnetic intensity

Magnetic susceptibility

A 10 kg rocket fragment falling towards the earth has a net downward acceleration of 5 ms -2 The net downward force acting on the fragment is

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5 N

10 N

50 N

105 N

The radius of second orbit of hydrogen atom is

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0.071 A

0.142 A

4.752 A

9.5298 A

The moment of linear momentum is called.

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Torque

Couple

Impulse

Angular momentum

During solid ficain the temperature.

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Remains constant at the freezing point

Increases at the freezing point

Decreases at the freezing point

Decreases at the melting point

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