Question # 1

A single silicon photovoltaic cell produces a voltage of the order of.

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0.3 V

0.6 V

0.9 V

1.2 V

When a ray of light is incident perpendicularly to the boundary of two media.

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It pass through without bending

It is speed is faster int he optically denser medium

It derivates from its original path

It is totally reflected back

A capacitor is prefect insulator for

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Direct current

Alternating current

Direct as well as alternating current

Pulsating current

Who is generally credited with the invention of first optical microscope.

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Hans Lippershery

Glavanni faber

Galileo

issac Newton

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

Which of the following form of electromagnetic energy has the highest frequency.

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X rays

Game rays

Ultraviolet waves

Infrared waves

Which of the following quantity is defined in terms of the rate of change of electric displacement field.

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Conventional current

Electronic current

Displacement current

Pulsating current

In annitilation of matter, positron and electron pair disappears into two

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Alpha particles

Beta particles

Game particles

X-rays

Who invented commutator.

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William Sturgeon

William Smith

Michael Faraday

Mosely

The process of mixing sound waves with carrier waves is known as.

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Rectification

amplification

Modulation

Demodulation

The function of collimator in spectrometer is to

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Disperse the light

Reflect the light

Make the light parallel

Diffract the light

Beats occur due to

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Reflection

Refraction

interference

Diffraction

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

The temperature which is the same in ^oC and ^oF is.

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-20

-40

20

40

Thermocouple is combination of.

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Thermocouples

Capacitors in parallel

Resistors in series

Ammeter and voltmeter

A body in equilibrium may not have

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Velocity

Momentum

Acceleration

K.E

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

A sample of an ideal gas may i) energy adiabatically, or ii) Expand isothermally. the net flow of heat into the gas from the exterior is.

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Positive is each case

Negative for i) and positive for ii)

Zero for i) and positive for ii)

Positive for i) and negative for ii)

The emission of electrons from a metal surface when exposed to light of suitable frequency is called.

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Pair production

Compton effect

Photo electric effect

Zeeman effect

An example of simple harmonic motion is

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Fast moving cricket ball

Motion of bicycle

Motion of a bee

Motion of simple pendulum

What happens to a soap bubble, when some charge is given to it.

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It collapses

It increases in size

It decreases in size

It feels nothing

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

If the temperature of the source and sink are increased by same amount the efficiency of the engine.

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Increases

Decreases

Remains unchanged

May increases of decrease

the gain of an amplifier is independent of

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The two externally connected resistances

What is happening inside the amplifier

Internal structure of the amplifier

All of the above

The part of theory of relativity which deals with accelerated bodies is called.

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special theory of relativity

General theory of relativity

Lorentz's theory of relativity

Galilean theory of relativity

The particles equal in mass or greater than protons are called.

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Mesons

Bosons

Baryons

Nucleons

The dimensions of strain are.

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[MLT-2]

[ML-1T-2]

[ML-2T-3]

It is a dimensionless quantity

A uniform vertical wire is stretched by hanging a mass from its lower end Which of the following does ot effect the strain in the wire.

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The stress

The upstretched length

The load applied

the Young's modulus of the metal

Venturimeter is a device used to measure

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Density of a fluid

Speed of a fluid

Pressure of a fluid

Viscosity of a fluid

Polarized sunglasses decrease glare on a sunny day because they

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Completely absorb light

Block a portion of light

Have a special colour

refract light

Eddy current can be minimized by

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Moving the conductor rapidly

Moving the conductor slowly

Using a metallic core

Using a laminated core

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