Question # 1

When nitrogen is bombarded by alpha particles nitrogen nucleus changes into

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Oxygen

Carbon

Barium

Helium

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

A° is the unit of:

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Energy

Length

Nuclear energy

Work

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

The vector sum of electric force and magnetic force is called:

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Deflecting force

Lorentz force

Newton force

Faraday's force

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

1 rem =

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0.001 SV

0.01 SV

0.1 SV

1.01 SV

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

The color code of "Green"

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8

3

5

7

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

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