Question # 1

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

In carbon resistors, then value of Blue colour is.

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6

7

8

9

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

Which one of the following bulbs has the least resistance.

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100 W

200 W

500 W

1000 W

Light emitting diodes are made from semiconductors.

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Silicon

Germanium

Carbon

Gallium arsenide

An AVO meter can also be called as.

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Digital multimeter

Digital voltmeter

Digital ammeter

Digital ohm meter

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

The radio active nuclide ₈₆Ra²²⁸ decays by a series of emissions of three alpha particles and one beta particle. The nuclide X finally formed is:

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₆₄X²²⁰

₈₆X²²²

₈₄X²¹⁶

₈₈X²¹⁵

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

All motions are

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Absolute

Uniform

Relative

Variable

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

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