Question # 1

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

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

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

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 number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

Lenz's law presented in

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1834

1934

1826

1836

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

Magnetic flux density is measured in

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Weber

Weber/m2

Tesla -m

Gauss

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

The unit of Magnetic flux is called.

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weber

weber/m²

NM^-1A^-1

None of above

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

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