Question # 1

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

Current passing through the coil of galvanometer

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CO/BAN

CoN /BA

NAB/CO

AN/BCO

Write the SI unit of magnetic flux.

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Tesla

Weber

Weber m-2

Tesla m2

The condition for the wheatstone bridge to be balanced is given by

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None of above

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

If 1 x 10⁷ electrons passes through a conductor in 1.0 micro second , then the current is.

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2 A

1.6 A

2.6 x 10^-6 A

1.6 x 10^-6 A

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

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Binding energy per nucleus for uranium is above:

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6.7 Mev

7.7 Mev

6.9 MeV

7.9 MeV

e/m=

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v/Br

Br/V

VB/r

Vr/B

Domains are existed in

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Ferromagnetic materials

Paramagnetic materials

Semi conductors

Diamagnetic materials

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

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