Question # 1

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

The product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than of a proton and greater than mass of neutron

Smaller than that of proton or neutron

Greater than that of an atom

The motion in a plane is the motion in

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one dimension

two dimension

three dimension

four dimension

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

Those quantities which can be measured accurately are known as

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Physical Quantities

Scalar Quantities

Vector Quantities

Non Physical Quantities

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

The path described by a projectile is called its

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orbit

trajectory

range

distance

Which one of the following elasticizes is possessed by fluids:

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Young's elastic modulus (length)

Bulk elastic modulus (volume)

Modulus of rigidity (shape)

None of these

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is:

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0.05 m

0.08 m

0.8 m

0.008 m

Ohm is the unit of

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current

capacitance

energy

resistance

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The transition from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

None of these

When a platinum wire is heated, it appears yellow at

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1600°C

900°C

1100°C

1300°C

Bernoulli's equation is based upon law of conversation of

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mass

momentum

Energy

None

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

Huygen's principles states that:

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Light travels in straigth line

Light has dual nature

Either of these

None of these

Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called

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Choke

impedance

Semi-conductor

None

The second law of thermodynamics is concerned with the circumstances in which

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heat can be converted into work

direction of flow of heat

none of them

both of them

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

Body which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

The value of resistivity is the least for:

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Copper

Aluminimum

Silver

Tungsten

Iron

The emf is measured in:

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Newton

Volt

J/C

Both A and B

Both B and C

The unit of viscosity is SI system is:

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Kg^-1m sec^-1

Kgm^-1 sec^-1

Kg^-1m^-1 sec

None of these

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

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-y direction

+y direction

+z direction

-z direction

None of these

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

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