Question # 1

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

The reactance of inductor depends upon

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L

All of the above

Grid in cathode ray oscilloscope controls.

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Number of electron

Temperature of filament

Frequency of electron

Energy of electrons

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

Mass equivalent of 931 MeV energy is:

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6.02 x 10^-23 kg

1.766 x 10^-27kg

2.67 x 10^-29kg

6.02 x 10^-87kg

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

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

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Length

Time

Mass

All of above

The radioactive decay obeys the law

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When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

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

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Filters

Rectifiers

Amplifiers

Sensors

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

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