Question # 1

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

The number of neutrons in Li are

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2

3

4

7

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

The number of Isotopes of cesium are.

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4

32

22

36

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

Charge on an atom is:

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Positive

Negative

Neutral

None of these

What is the resistance of carbon resistor which has band brown black brown.

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100 Ohm

1000 Ohm

10 Ohm

1.0 Ohm

In according with Bohr's theory the K.E of the electron is equal to:

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ke²/2r

Ze²/r

Ze²/r²

Ze²/2r²

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Two resistance of 2 Ohm each are connected in parallel combination equivalent resistance will be.

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4 Ohm

2 Ohm

1 Ohm

8 Ohm

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

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