Question # 1

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

A transistor has:

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Two regions

Three regions

Single regions

Four regions

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?

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Nucleas A

Nucleus B

Less than nucleus

None of these

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

Two down and one up quarks make

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Proton

Neutron

~~photon~~

Positron

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

the number of terminals in a semiconductor diode are

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2

3

4

5

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

Most of the electrons in the base of an NPN transistor flow:

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Out of the base lead

Into the collector

Into the emit

Into the base supply

Balmer series lies in

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Visible region

Invisible region

Ultraviolet region

Infrared region

The first orbit in the hydrogen atom has a radius.

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0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

Which one of the following is correct

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All of above

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

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