Question # 1

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The Weber is unit of measure of:

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Conductance

Electric current

Magnitic flux

Electric flux

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

The circuit of full wave rectification consist of

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Three diodes

Four diodes

Two diodes

One diode

The reactance of inductor depends upon

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L

All of the above

Those materials whose resistivity becomes zero at certain temperature is called:

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Semiconductor

Super conductor

Conductor

Insulator

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

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

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

The gate, which changes the logic level to its opposite level is called

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NOR gate

AND gate

OR gate

NOT gate

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

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

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0

π

-π

π/2

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