Question # 1

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

The dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Presence of dielectric always.

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Increase the electrostatic force

Reduces the electrostatic force

Do not effect electrostatic force

Doubles the electrostatic force

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

A pair of quark and anti quark makes a.

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Meason

harden

Lapton

Baryon

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

if time constant in RC series circuit is small, then capacitor is charged or discharged.

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Slowly

Rapidly

At constant rate

Intermittently

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

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Uncertainity Priciple

De-broglie Theory

Einstin Theory

Photo electric effect

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