Question # 1

A pair of point charges with equal magnitude and opposite sign separated by a distance 'r' produce.

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Electric dipole

Electric charge

Electric field

electric arc

The ablate of rays of different colours to converge a single point sifter refraction though a convex lens is called.

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Come

Distortion

Spherical aberration

Chromatic aberration

Planets move around the sun due to.

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Centrifugal force

Centripetal force

Gravitational pull between them

Frictional force between them

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

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

A terrestrial telescope produces

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An react and real image

An inverted and real image

An inverted and virtual image

An erect and virtual image

An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.

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120 s

150 s

1200 s

1500 s

Surface tension of a liquid may be defined as

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Heat energy per unit area

P.E. per unit area

surface energy per unit area

K.E. per unit area

Angular frequency time period and frequency in SHM do not depend upon.

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Mass

Force constant

Amplitude

All of these

use of outer layer in optical fires called cladding is mainly to.

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Scatter thelight

Absorb unwanted light

Transmit the light

Produce total internal reflection

Which temperature is the absolute measure of temperature.

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Thermodynamic temperature

Freezing point

Boiling point

Absolute zero

On which parameter the time required to charge a capacitor depends upon.

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magnitude of charge

Applied potential difference

Capacitances

Time constant

The electrons behave as waves, because they can .

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Produce ions in gases

Diffracted by a crystal

Be deflected by electric fields

Be deflected by magnetic fields

A negative acceleration does not necessaryimply.

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Decreasing speed

An increasing distance

An increasing speed

A decreasing distance

Neil Bohr made his three postulates in.

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1897

1905

1913

1921

When light of particular frequency is allowed to fall upon a metal surface electrons are emitted from a these emitted electrons are called.

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Photons

Holes

Quants

Photo electrons

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

If a force of 50 N is acting along x axis , then its component along y-axis will be.

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Zero

The same

Of the half magnitude

Of the double magnitude

The force of friction that comes into action after the motion has started

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Static friction

Dynamic friction

Friction only

Limiting friction

At which temperature a ferromagnetic material becomes paramagnetic on healing.

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Kelvin temperature

Celsius temperature

Curie temperature

Fahrenheit temperature

A boat loving at constant speed 'v' through still water experiences a total frictional drag F what is the power developed by the boat.

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1/2 Fv

Fv

1/2 Fv2

Fv2

A battery drives 50 C of charge round a circuit. The total work done is 750 J What is the electromotive force of the battery.

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0.07 V

15 V

700 V

1500 V

A physical quantity which produces rotation in a body is called.

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Force

Torque

Momentum

accelerate

What is the traditional name for a capacitor

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Choke

Condenser

Transformer

Inductor

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

A heat engine can develop efficiency equal to 100% if the temperature of the sink is

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Less than that of source

Equal to that of source

0 K

0 ^oC

The buoyancy depends upon the

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Depth to which the body is immersed

Shape of the body

Mass of the body

Mass of the liquid displaced

Magnetic moment is a

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Scalar

Vector

Phasor

Tensor

The two elements with same number of electrons but different mass number are called.

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Isotones

Isobars

Isotopes

Isomers

Which of the following does not reflect the laws of static charges.

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like charges repel

Opposite charges attract

Neutral charges repel

Neutral objects are attracted to charged ones.

If a gymnast sitting on a rotating stool with his arms out stretched lowers his arms.

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The angular speed increases

The angular speed decreased

The angular speed becomes zero

The angular speed becomes constant

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