Question # 1

A body is equilibrium may not have

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Momentum

Velocity

acceleration

K.E.

How eddy current losses are reduced in A F and R F transformers.

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By using air cores

By using shell cores

By using laminated cores

By using ferrite cores

A given mass of air occupies 12 m2 at normal atmospheric pressure if the pressure is increased to 4 times the original value without changing the temperature what volume will the air occupy.

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3 cm3

6 cm3

9 cm3

12 cm3

What is the overall gain, if three amplifiers each with a gain of 30 are cacaded.

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30

90

270

27,000

When a hot liquid is mixed with a cold liquid temperature of the mixture.

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First decreases and then becomes constant

First increases and then becomes constant

Continuously decreaes

Is undefined for some time and then nearly becomes constant

Bracket and plunk series of spectral lines lye in the

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Visible region

Ultraviolet region

Far infrared region

Infrared region

Inductance divided by resistance and the product of capacitance and resistance both have units of.

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Charge

Time

Force

Current

Two light waves which are not coherent cannot produce.

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Interference

Diffraction

Reflection

Dispersion

What is used in an electric circuit to allow current in one direction only.

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A fuse

An ammeter

A diode

A relay

Who suggested that energy is radiated or absorbed in discrete packers called quanta.

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Max. Planck

Stefan

Lummer

Boltzmann

The product of mass and specific heat of a substance is called.

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Latent heat

Water equivalent

Atomic heat

Heat capacity

If the output voltage is not smooth but pulsating then it can be made smooth by using a circuit known as.

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Filter

Gate

shunt

Fuse

Which one of the following does not have the same dimenstions.

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Energy ,work, heat

Pressure, stress, Young's modulus

Voltage, electromotive force, potential difference

Electric flux, electric field, electric dipole moment

Which scientist made the fist successful terrestrial measurement of the speed of light

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Isaac Newton

Ole Romer

Armand Fizeace

Albert Michelson

A pendulum vibrates with a time period of 1 s which range of sound is produced by it

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Audible

Infrasonic

Ultrasonci

Super sonic

The value of critical angle of glass is

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45^o

42^o

48^o

52^o

In a compound microscope objective lens acts as a projector and eye place as a

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Compensator

Erecting lens

Simple microscope lens

Turntable

Mostly widely used types of gas LASER are.

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Neon

Argon ion

Helium

All of these

Radio carbon in the atmosphere is produced by the bombardment of.

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Oxygen by high energy neutrons

Oxygen by high energy protons

Nitrogen by high energy protons

Nitrogen by high energy neutrons

The image formed by a projector is

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Real, inverted and enlarged

Real, upright and enlarged

Real ,inverted and diminished

Virtual, upright and diminished

Mean life of a radioactive sample is 100 s its half life will be

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0.693 s

1 s

6.93 s

69.3 s

If an object moves with velocity of light the apparent mass of the object as compared to list original mass is

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greater

Smaller

Same

zero

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

X-rays eject electrons from matter by

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Pair production

Pair annihilation

Compton effect

Photoelectric effect

An example of continuous spectrum is.

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Black body radiation spectrum

Molecular spectra

Atomic spectra

All of the above

The fact that the edge of a shadow formed by a point source of light shining on an object is not sharp is an example of.

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Refraction

Diffraction

Polarization

Dispersion

Who discovered a phenomenon of thermos electricity.

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Peltier

Joule

Seeback

thomson

Which law states that the angle of incidence equals the angle of refraction.

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Law of reflection

Law of refraction

Snell's law

Hygens's principle

At low frequency the value of resistance of certain capacitors is.

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small

Large

Moderate

Unmeasurable

A resistor whose resistance decreases with increasing intensity is.

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Light dependent resistor

Thermistor

Thermocouple

Strain gauge

The power of a convex lens is 5 D at what distance the object should be placed from the lens so that its real and 2 times larger image is formed.

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25 cm

30 cm

35 cm

40 cm

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