Question # 1

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

The electrons in one coulomb change is equal to.

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1.6 x 10^-19

2.25 x 10^-19

6.25 x 10^-18

6.25 x 10^-19

The unit of Magnetic flux is called.

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weber

weber/m²

NM^-1A^-1

None of above

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

In 'N' type material, the minority charge carriers are.

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Free electrons

Holes

Protons

Mesons

The first orbit in the hydrogen atom has a radius.

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0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

The reciprocal of decay construct lamda of a radioactive element is.

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Half life

Mean life

Curie

total life

Resistance tolerance of silver band is.

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10%

6%

7%

5%

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

The temperature at which, semiconductor behaves as insulators:

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10k

0k

237k

None of above

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

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

A rheostat can be used as variable resistor as well as a-------------

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Potential divider

Current divider

Wheat stone bridge

Power divider

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