Question # 1

The rms value of alternating current is always

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Infinity

Unity

Positive

Negative

The air pressure at the bottom of an air foiling motion is

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Greater than that on the top

Equal to that on the top

Grather than that on the top

Zero

The diameter of a lens is called.

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Focal length

Principal axis

Optical centre

Aperture

The exitance of antiparticle was discovered by

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Wilson

Anderson

Dirac

Stefen

Which of the following is not true.

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Velocity can be nagative

Velocity is a scalar

Speed is a vector

Speed can be negative

The magnetic field inside a solenoid is

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Zero

Infinite

Uniform

Non uniform

The result of the alpha particle scattering experiment gave evidence for which of the following.

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Nuclear fusion

Radio active decay

Existence of isotopes

Nuclear atom

When we pass a radiation from a radioactive material through an electric field.

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All three kinds of rays will be deflected

Only the Gama rays are deflected

The Alpha and Beta particles are deflected

Only the alpha particles are deflected

The particles less in mass than protons are

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Measons

Bosons

Baryons

Nucleons

Eye colour is the colour of

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Iris

Retina

Comea

Pupil

Due to which phenomenon, diamond shrines so brightly.

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Scattering of light

Refraction of light

Dispersion of light

Total internal reflection

How many terminals does a BJT have.

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1

2

3

4

The rms value of emf in a circuit is given by a factor of.

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0.637

0.7

0.707

1.11

A part of electromagnetic spectrum that can be detected by the human aye

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Angle of incidence

Angle of refraction

Light

Angle of reflection

Mosley's law establishes the x rays fluorescence's of target element with its.

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Atomic weight

Atomic number

Density

Lattice constant

The period of a geostationary satellite is.

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32 hours

72 hours

48 hours

96 hours

The process by which nuclei emit a ,b and gama rays in order to attain stability is called.

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Radioactive disintegration

Radio activity

B decay

Radioactive transmulation

Which of the following is a method of energy transfer.

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Conduction

Wave motion

Radiation

All of these

Balimer series lies in the

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Visible region

Invisible region

Infrared region

Far infrared region

What is the part of a simply D.C. motor that reverses the direction of current through the coil every half cycle.

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Armature

Brushes

Commutator

Slip rings

On which parameter the time required to charge a capacitor depends upon.

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magnitude of charge

Applied potential difference

Capacitances

Time constant

The cathode ray oscilloscope is used for

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Displaying the waveform of given voltage

Displaying the wave form of given vibrations

Rectifying a.c to d.c.

Rectifying D.C. to A.C.

How does viscosity affect relative motion between the liquid layers.

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Does not affect

Accelerates

May accelerate of retard

Retards

Light of passing through a polaroid is

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Plane polarized

Unpolarized

Circularly polarized

Elliptically polarized

In a charged capacitor the energy resides

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In the negative plate

In the positive plate

In the field between the plates

Around the edge of the plates

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

A substance which has empty conduction band.

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Insulator

Conductor

Semi conductor

super conductor

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

X-rays are absorbed maximum by

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Paper

Copper

Steel

Lead

The wave form of SHM is a

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Sine wave

Cosine wave

Square wave

Electromagnetic wave

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

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