Question # 1

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

e/m=

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v/Br

Br/V

VB/r

Vr/B

A pair of quark and anti quark makes a.

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Meason

harden

Lapton

Baryon

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

The SI unit of stress is same as that of.

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Pressure

Force

Momentum

Work

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

The device which are required to convert various physical quantities into electric voltage are called.

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Filters

Rectifiers

Amplifiers

Sensors

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The anodes in cathode ray oscilloscope.

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Control number of waves

Control brightness of sept formed

Accelerate as well as focus beam

Negative potential w.r.t to chithode

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

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Infinite energy

Maximum energy

Minimum energy

Zero energy

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

James chadwick discovered:

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Proton

Positron

Neutron

Electron

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