Question # 1

Weber is the unit of

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Magnetic flux

Permeability

magnetic force

None of above

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

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Infinite energy

Maximum energy

Minimum energy

Zero energy

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

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Wien's constant

Planck's constant

Davison constant

Lumber's constant

The mass of beta particle is equal to mass of.

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Protons

Electrons

Neutrons

Boron

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal

Most of the electrons in the base of an NPN transistor flow:

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Out of the base lead

Into the collector

Into the emit

Into the base supply

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

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