Question # 1

A device that shows the visible path of ionizing particle is called.

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GM counter

Solid state detector

Scalar

Wilson cloud chamber

When the medium is insulator the elecrostatic force between the charges is

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Decreased

Zero

Increased

None of above

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

Hydrogen bomb is an example of.

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Nuclear fission

Nuclear fusion

Chain reaction

Chemical reaction

When a pot difference of 4 volt is applied across resistance, 10 J of energy is converted Find charge flows

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0.20 C

2.5 C

5.0 C

10.0 C

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

Output resistance of an op amp is

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High

Low

Zero

Equal to input resistance

A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking?

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25 m

1mm

2mm

0.5 m

The color code of "Green"

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8

3

5

7

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

An ammeter is an electrical instrument which is used to measure.

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Voltage

Current

Resistance

None

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