Question # 1

Which uranium isotope having the atomic weights as given below is easily fissionable.

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234

235

236

238

The Rutherford atom according to classical theory is

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Stable

Unstable

Partially stable

Quantized

During transition, atom cannot emit

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Visible light

Ultraviolet radiation

Infrared radiations

gama rays

The gama rays have

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Thin tracks

Thick tracks

No definite tracks

Continuous tracks

In the experiment of photo electric effect the minimum frequency of photons at which electrons are emitted from a metal surface is called.

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Critical frequency

Typical frequency

Threshold frequency

Surface frequency

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.

An increase in frequency above threshold frequency results in.

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Increase in photo electric current

Increase in K.E. of electrons

Decrease in photoelectric current

Decreases in K.E. of electrons

The term used for the emission of electrons when light strikes a surface.

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The zeeman effect

The photo electric effect

Skin effect

Compton effect

When a posirtron is emitted it causes.

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Mass number to increase by one

mass number to decrease by one

Atomic number to decrease by one

Atomic number to increase by one

Which of the following causes the deflection of Alpha particles when they re passed through a thin foil.

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Attraction of nucleus

Collision with nuclei

Interactions with electrons

Electrostatic repulsion by the nucleus

Which quantity remains fixed in isobars.

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Mass number

Atomic number

Number of neutrons

Number of protons

Which of the following radiations can penetrate 20 cm thick steel.

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Alpha particles

Beta particles

Gama particles

Neutrons

A transistor consists of.

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One p-n junction

Two p-n junctions

Three p-n junctions

Four p-n junction

NOR gate is a combination of.

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OR gate and NOT gate

OR gate and AND gate

OR gate and OR gate

NOT gate and AND gate

Hydrogen bomb is based on

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Controlled chain reaction

Uncontrolled chain reaction

Nuclear fusion

Nuclear fission

A gama ray of energy 1900 MeV is absorbed by

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Proton antiproton pair

Electron positron pair

Producing heat in the substance

The orbit

The phenomenon is which the wavelength of scattered X-rays is larger than the incident X-rays is known as.

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Zeeman's effect

Photoelectric effect

Compton's effect

Annihilation of matter

The particles less in mass than protons are

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Measons

Bosons

Baryons

Nucleons

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

An important property of an ideal power supply is.

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Infinite internal resistance

Zero internal resistance

Large output resistance

Small output resistance

Which particle is removed by a photon.

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Quark

Electron

Proton

Neutron

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