Question # 1

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

Young's modulus for water's is

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Zero

1

2

3

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

___ is correct relation.

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IT = 10^-4G

IT = 10⁴ G

IT = 10² G

IT = 10^-2 G

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

The conventional current is due to the flow of

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Atoms and molecules

Positive charge

Negative charge

Bot (b) and (c)

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is

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1972

1965

1958

1913

Lenz's law presented in

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1834

1934

1826

1836

Paschen series lies in the

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Far ultraviolet region

Visible region

Ultraviolet region

Inferred region

Which of the following is one of the spectral series of atomic hydrogen?

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Brockett series

Balmer series

P fund series

All of above

A battery is used in

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ohmmeter

Ammeter

Galvanometer

Voltemeter

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

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