Question # 1

The motional emf is give by

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qvB

IBL

eBL

vBL

A substance having the negative temperature co efficient of resistivity out of the following is.

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Carbon

Iron

Tungsten

Gold

Earth orbital speed is.

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10 km/s

20 km/s

30 km/s

40 km/s

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

The principle regarding the dual nature of light was first discovered by

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Compton

J.J.Thomson

De-Broglie

Heisenberg

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

A charged particle enters in a strong magnetic field its K.E.

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Remain constant

Increases

Decreases

Increases then decreases

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

The gain of transistor amplifier depends upon

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Resistance connected with collector

Resistance connected with base voltage

Input voltage

Output voltage

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