Question # 1

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

Which type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg

Write the SI unit of magnetic flux.

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Tesla

Weber

Weber m-2

Tesla m2

A capacitor is perfect in insulator for.

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Alternating current

Sparking current

Eddy current

Direct current

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

Energy of Black body radiation depends upon

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Nature of surface of body

Nature of material of body

Shape and size of body

Temperature of the body

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

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

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Voltage

Current

Charge

Botha a and b

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

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