Question # 1

Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.

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20 minutes

40 minutes

80 minutes

120 minutes

Which circuit elements has two stable states and can be used to store information.

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Flip flop or latch

Logic gate

Oscillator

Amplifier

An Alpha particle is the same as

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A helium nucleus

A high speed electron

A hydrogen nucleus

Electromagnetic radiation of short wavelength

The SI unit of radioactivity is.

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Becquerl

Curie

Joule

rutherford

Which quantity remains fixed in isobars.

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Mass number

Atomic number

Number of neutrons

Number of protons

Cosmic rays mostly comprise of

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Neutral particles

Negative charged particles

Positively charged particles

Ions

Both xenon and cesium each have

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24 isotopes

28 isotopes

32 isotopes

36 isotopes

A device used to determine mass of an isotope quite accurately is known as.

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Spectrometer

Mass spectrometer

Mass detector

Electronic balance

The phenomenon of radioactivity is associated with

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Decay of nucleus

Decay of atoms

Fusion of nuclei

Emission of electrons

Ionization of a hydrogen atom originally in its ground state takes a minimum out of energy equal to.

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2.4 J

4.2 J

12.3 eV

13.6 eV

Which of the following properties is not exhibited by X-rays.

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Interference

Diffraction

Polarization

Deflection of electric field

The ionization potential of hydrogen atom is.

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10.2 V

13.6 V

12.97 V

27.2 V

The mass of proton is equal to.

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1.673 x 10^-27 kg

1.673 x 10²⁷ kg

9.1 x 10-31 kg

9.1 x 10³¹ kg

What is the basic advantage of class A operation of an amplifier.

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It has high efficiency

It has high gain

It has low distortion

It has high distortion

As the mass number increases, the binding energy per nucleon in a nucleus

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Increases

Decreases

Remain constant

Varies in a way that depends upon A

A complete amplifier circuit made on a silicon chip and enclosed in a small capsule is

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Inductor

Metal detector

Diode

Operational amplifier

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

The binding energy per nucleon for uranium is about.

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7.7 MeV

9.6 MeV

13.6 MeV

21.6 MeV

In heavy atims the electrons are assumed to be arranged in.

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Elliptical shells

Inner shells

Concentric shells

Outer shells

The two elements with same number of electrons but different mass number are called.

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Isotones

Isobars

Isotopes

Isomers

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