Question # 1

Mass of meason is

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Greater then proton

Less than proton

Equal to proton

Equal to neutron

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

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

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Capacitor

Commutator

Resistor

Inductor

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

The algebraic sum of potential change in a closed circuit is zero.

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Kirchhoff's 1st rule

Kirchhoff 2^nd rule

Krichoff's 3^rd rule

Kirchhoff 4^th rule

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

A proton is about 1840 time than an electron. When it is accelerated by a potencial difference if 1 kV, its kinetic energy will be:

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1884 ke V

1/1840 keV

1 keV

920 keV

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

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

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

Number of electros emitted in photo electric effect depend upon.

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Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

Write the SI unit of magnetic flux.

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Tesla

Weber

Weber m-2

Tesla m2

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