Question # 1

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:

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10.2 eV

0 eV

3.4 eV

6.8 eV

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

To convert a galvanometer into an ammeter, we connect with it a

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Shunt resistance

Low value parallel

Low value by pass resistor

All of above

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

James chadwick discovered:

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Proton

Positron

Neutron

Electron

Thermosouple is an arrangement of two different metals:

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Two convert heat energy into electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electrical energy into heat energy

The electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

Torque on a current carrying coil

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τ=IBA cos

τ = ILB sinα

τ = IBA sinα

τ = ILBcosα

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

The natural frequency of L.C circuit is equal to

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During electrolysis process, density of CuSO₄ solution

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Remains constant

Decreased

Increased

None of these

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

The gate, which changes the logic level to its opposite level is called

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NOR gate

AND gate

OR gate

NOT gate

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