Question # 1

Special theory of relativity deals with the events in the frames of reference which move with constant.

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Time interval

Acceleration

Momentum

space interval

Radioactive substances do not emit

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Alpha particles

Beta particles

Gama rays

Neutrons

Matter waves

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Are electromagnetic in nature

Travel with the speed of light

Can be diffracted

Are longitudinal waves

In a photocell, certain metals emit electrons for

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Visible light

X-rays

Infrared light

Ultraviolet light

Why FET amplifiers are called voltage controlled devices.

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Input is a current signal

Output is a current signal

Input is a voltage signal

Output is a voltage signal

Transistor are made from

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Plastics

Metals

Insulators

Doped semiconductors

Which experiment confirmed the de Broglie hypothesis.

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Double slit experiment

Division germier experiment

Schrodinger's Cat experment

Bohr's experiment

When a helium atom loses an electron it becomes.

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An a particle

A proton

A positive helium ion

A negative helium ion

Alpha particles are used for the treatment of skin of a patient due to.

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Highly ionizing power

Low penetration power

Positively charged particles

Helium nucler

Base current of a transistor is 1 mA and collector current is 99 mA What is emitter current.

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1 mA

100 mA

98 mA

110 mA

Which one of the following quantities is conserved in a nuclear reactor.

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Energy only

Mass only

Momentum only

Mass energy and momentum

Which one among these contacts in a transistor is non rectifying.

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Base

Emitter

Collector

None of these

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

When a beta particle travels though a medium it knocks out electrons from the atoms due to.

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Gravitational force of attraction

Electrostatic force of repulsion

Nuclear force

Electromagnetic induction

The total energy of the hydrogen atom is

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zero

Infinite

positive

Negative

Which of the following is invariant under Galilean transformation.

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Velocity

Impulse

Momentum

Distance

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

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

Which particles have spin quantum number 1/2

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Mesons

Laptons

Hadrons

Muons

A single quantum of electromagnetic radiation is termed as.

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Compton

Photon

Hyperon

Meson

The emission of Beta particle from protonium -218 results in the formation of.

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Protactinium -231

Thorium -232

Astatine -218

Radon -222

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