Question # 1

An active component of an electronic circuit consisting of a small block of semiconducting material to which at least three electrical contacts are made is known as.

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Rectifier

Amplifier

Thermocouple

Transistor

The net charge on a condenser is

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Zero

Q/2

2Q

Infinity

Ashes from a campfire deep in a cave show carbon -14 activity of only one eighth the activity of fresh wood. How long ago was that campfire made.

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13590 years

15190 years

17190 years

21190 years

Which we double the voltage in a simple electric circuit, we double the

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Current

Power

Resistance

Both a and b

The value of electric field intensity is.

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Volt

Coulomb

Newton

Newton coulomb

Prof. Abdul Salam was awarded Novel prize in

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1970

1972

1979

1983

When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.

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An increase in pressure

An increase in temperature

A change in phase

A change in entropy

A diatomic gas contains only

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Translational K.E.

Rotational K.E.

Vibrational K.E.

All of these

Which of the following is not true.

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Velocity can be nagative

Velocity is a scalar

Speed is a vector

Speed can be negative

Transistor are made from

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Plastics

Metals

Insulators

Doped semiconductors

In a fission reactor which particle causes a uranium -235 nucleus to split.

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Alpha particle

Gama ray

Neutron

Proton

To produce beats it is necessary to use two waves.

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Travelling in opposite direction

Of slightly different frequencies

Of equal wavelengths

Of equal amplitudes

Magnetic effect of current was discovered by

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Faraday

Fleming

Oersted

Ampere

When a vector is multiplied by a negative number its direction.

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Remains unchanged

Changes by 180 ^o

Becomes horizontal

Vertical to each other

The SI unit of absorbed dose in.

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Bel

Weber

Rem

Grey

The first demonstration of wave nature of light was provided in 1801 by the experiment of

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HHuygen

Thomas young

Fresnel

Maxwell

When a direct current is passed though a junction formed of two dissimilar metals the junction becomes warmer or cooler depending on the.

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Current direction

Thermocouple used

Temperature gradient

Amount of current

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

If pressure and temperature of an ideal gas is doubled and volume is halved, the number of the gas molecules.

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Become half

Remain constant

Become double

Become three times

The most familiar example of radioactive dating is.

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Nitrogen dating

Carbon dating

Hydrogen dating

Helium dating

The ratio between the energy dissipated in some process and the heat that appears as a result is the

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Specific heat

Mechanical equivalent of heat

Kilocalories

Triple point

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

The maximum stress a solid material can sustain with out undergoing permanent deformation is called.

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elastic limit

Plastic

elastic deformation

Plastic deformation

A body of mass 3 kg lies on the surface of the table 2 m high it is moved on the surface 4 m the change in P.E. will be.

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9.8 J

6 J

Zero

329 J

If we use two diodes and a centre tapped transformer we will get.

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A transistor

An amplifier

A half wave rectifier

A full wave rectifier

The temperature of a certain substance in Celsius scale of temperature is 800 ^oC in Kelvin scale it is.

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173 K

931 K

1073 K

1193 K

A straight wire carrying current will experience a force when place in uniform magnetic field if

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The current and field are parallel

The current and field are at an angle

the current and field are parallel in opposite directions

All of the above

The temperature scale based upon triple point of water was given by

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Rumford

Carnot

Kelvin

Celsius

Pitch of the sound determines

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Its shrillness

Loudness of sund

Intensity level

Quality of sound

The minimum amount of energy in an individual electron has to gain to escape from a particular surface is called.

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Threshold frequency

work function

Wave number

Kinetic energy

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

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