Question # 1

Rainbows and mirage are formed by

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Reflection only

Refraction only

dispersion only

A combination of refraction, total internal refraction and dispersion

Which of the following pair is correct.

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Rutherford - x-rays

Roentgen - Electron

Chadwick - Neutron

J.J. Thomson -Photon

Which of the following should not change in an Isothermal process.

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Volume

Pressure

Temperature

All of these

Which of the following quantity has a unit that can be expressed in terms of just two different SI base units.

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Area

Change

Electric current

Length

The real depth of a swimming pool is 2 m What is the apparent depth of the pool if the refractive index of water is 1.33

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1.0 m

1.5 cm

2.0 m

2.5 m

Diffraction is the property according to which light waves.

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Change their direction on entering a different medium

Produce chemical effects

Bend round the corners

Bend towards the centre

Besides U ²³⁵ what else is needed for making as atomic bomb.

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Electons

Protons

Neutrons

Photons

A transistor consists of.

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One p-n junction

Two p-n junctions

Three p-n junctions

Four p-n junction

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

According to Huygen's principle

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Light bends round corners

Light travels in a straight line

All points on primary wave front are considered centre of distances

Light has wave nature

A heat engine with 100% efficiency would have to

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Do no work

Be at a uniform temperature

Use no heat

Discharge at 0^oC

If slope of velocity time graph gradually decreases, then a body is said to have

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Negative acceleration

Positive acceleration

Uniform velocity

Variable velocity

Velocity of sound in any medium deepness upon.

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Elasticity

Density

Volume

Mass

At which temperature a ferromagnetic material is converted into a paramagnetic one.

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curie temperature

Boyle's temperature

Natural temperature

Neutral temperaturre

Iron loss in a dynamo arises because of.

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The resistance of armature coil

The production of eddy current

The presence of mechanical friction

The leakage of flux

The internal energy of monoatomic gas is.

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3/2 RT

Independent of temperature

In the form of K.E.

Partially kinetic and partially potential

If a single convex lens is placed closed to the eye then it can be used as

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Telescope

Simple microscope

Compound microscope

Opera glass

Which of the title for combining of notes that produce jarring effect on the ear.

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Noise

Melody

Harmony

Discord

Which of the following is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

Advantage of using gases as thermornetic substrates is taht

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Gases have a small coefficient of expansion

Expansion of gases is irregular

Gases can be obtained in pure form

Gases have a large coefficient of expansion.

If the image is virtual then its distance from the lens is taken.

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Positive

Negative

Double

Half

The process of converting A.C and D.C. is known as

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Amplification

_Filtration

Rectification

Saturation

Which one of the following represents an ohm.

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Volt per ampere

Joule per second

Watt per ampere

Joule per coulomb

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

A force of 50 N acts on a body for 10 s What will be change in momentum.

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5 Ns

500 Ns

200 Ns

800 N s

The maximum field that a dielectric material can with stand whiteout breaking down is called its.

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Di electric strength

Magnetic strength

Capacity

Resistance

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

An ammeter can be converted into a voltmeter by connecting a

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Low resistance i series

High resistance in series

High resistance in parallel

Low resistance in parallel

What is an elementary particle, the basic unit of light and all other form of electromagnetic radiation.

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Phonon

Photon

Neutron

Proton

Which is the health care profession concerned with eyes as well as vision visual system and vision information processing in humans.

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Optometry

Ophthalmology

Telemetry

Psychology

The centre of gravity of a cylinder is.

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At the intersection of medians

At the centre

At the middle point of axis

At the intersection of diagonals

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