Question # 1

48 days after the receipt the amount of iodine -131 left behind is only.

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0.1325 g

0.2135 g

0.3125 g

0.1235 g

The decay process in which an unstable nucleus splits into two fragments of comparable mass is known as.

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Nuclear fission

nuclear fusion

Radioactivity

Carbon dating

According to Max. Planck, energy is released or absorbed in discrete packets called.

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quanta

Meson

Energy shells

Position

The Rutherford atom according to classical theory is

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Stable

Unstable

Partially stable

Quantized

Transistor are made from

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Plastics

Metals

Insulators

Doped semiconductors

The radius of first Bohr's orbit for hydrogen atom is.

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0.53 m

0.53 nm

0.053 nm

0.53 mm

The nucleus of tritium is called.

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Proton

Triton

Deuleron

Positron

The energy in an electromagnetic wave is carried in the units called.

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Protons

Electrons

Neutrons

Nucleus

Which of the following configuration of BJTs gives both voltage gain and current gain.

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common Base

Common Emtter

Common collector

All of the above

The SI unit of current gain is.

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Ampere

Ampere metre

Ampere volt

It has no unit

In electromagnetic spectrum X-rays are next to.

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Water waves

Radio waves

ultraviolet waves

Infrared waves

At what speed the mass of a body will be doubled.

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0.67 C

0.77 C

0.87 C

0.97 C

The most suitable material for moderator in a nuclear reactor is.

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B

Cd

D2O

Uranium

Which of the following is the most massive particle.

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Deuteron

Alpha particle

Neutron

positron

In a transistor which one is very thin.

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Collector

Emitter

Base

Depletion region

The necessary condition for nuclear fusion is.

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High temperature and high pressure.

Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure.

The Inner electrons in heavy atoms can be disturbed and dislodged by.

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X rays

Alpha particle

Beta particles

gama particles

Which one of the following gates in a a universal gate.

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OR

AND

NOT

NAND

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

Which of the following has greatest binding energy per nucleon.

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Normal hydrogen

Deuterium

Tritium

Helium-4

A solid state detector is basically

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A reverse biased p-n junction

A forward biased p-n junction

A p-n -p transistor

A n-p-n transistor

Which of the following are electromagnetic waves.

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Alpha particles

Beta particles

Gama rays

Water waves

If the base emitter junction is forward biased and base collector junction is reverse biased the BJT is in.

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cut of mode

Amplification mode

Saturation mode

Inversion mode

The number of electrons in U nucleus are.

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92

235

zero

143

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