Question # 1

Which of the following is formed by decay of a free neurton.

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A number of electrons

Two protons

A proton and an electron

An alpha particle

There are how many types of forces or interactions.

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Two

Three

Four

Five

A logic circuit whose output signal is '1' when inputs are different is.

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NAND gate

NOR gate

Exclusive OR gate

Exclusive NOR gate

Push pull amplifiers employ

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One transistor

Two transistors

Three transistors

Four transistors

The phenomenon of radioactivity is associated with

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Decay of nucleus

Decay of atoms

Fusion of nuclei

Emission of electrons

A transistor can be used as

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Oscillator

Amplifier

Switch

Both a and c

The rest mass of a particle is independent of the

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Wavelength of the particle

Mass of the particle

Speed of the particle

Energy of the particle

The SI unit of current gain is.

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Ampere

Ampere metre

Ampere volt

It has no unit

Which of the following is the most commonly used regions of operations for a transistor.

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Cut off

Saturation

Active

All of these

The total number nucleons in a nucleus are called.

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Mass number

Atomic number

Neutron number

Isotopes

Which Isotopes is use din radioactive dating.

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C¹²

C¹³

C¹⁴

C¹⁶

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 half life of a radioactive substance is 6 years What is the time taken by 12 g of this substance to decay completely.

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12 years

24 years

48 years

infinity

In n-p-n transistor the current flows in the direction from

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Emitter to base

emitter to collector

Base to emitter

Base to collector

The reciprocal of decay constant lamda of a radioactive substances is equal to.

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total life

Half life

Mean life

Curie

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

What is the quantitative description of the effect of radiation on the living tissue.

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Radiation dosimetry

Radioactive dating

Telemetry

Dosage

X-rays used for

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Cutting boring and precision welding

Retina stitching in eye operations

Detecting heavy elements under the earth

Deflecting flaws in welding and casting

The number of electrons in U nucleus are.

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92

235

zero

143

A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time.

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25 g

50 g

75 g

100 g

Which of the following quantities is discrete according to Bohr's hypothesis.

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Momentum

Potential energy

Angular velocity

Angular momentum

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