Question # 1

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

A battery move a charge of 40 C around a circuit at constant rate in 20 Sec. The current will be.

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2 A

0.5 A

80 A

800 A

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

Which is not fundamental logic gate.

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NOT

AND

OR

NAND

SI unit of electric flux is.

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NmC¹

Nm^-1 C¹

Nm²C^-1

Nm³C²

The amount of energy equal to 1.6 x 10^-18 J is called.

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One volt

One milli volt

One electron volt

One mega electron volt

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

James chadwick discovered:

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Proton

Positron

Neutron

Electron

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

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Wien's constant

Planck's constant

Davison constant

Lumber's constant

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

None of these

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

Specific resistance of a material depends upon.

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Length

Area

Temperature

Both A and B

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