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4

Astigmatism, a structural defect of the eye, is due to

A. the eye lens being thin

B. the eye lens being thick

C. lack of symmetry in the curvature of the eye preventing rays of light from being brought to a common focus

D. the pupil being very small

Correct Answer :

C. lack of symmetry in the curvature of the eye preventing rays of light from being brought to a common focus


Related Questions

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4

The completely dark portion of a shadow of an object is known as

A. umbra

B. penumbra

C. image

D. black portion of light

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4

The plants in a greenhouse are enclosed in a glass enclosure because

A. glass allows the heat radiations of shorter wavelengths from the sun to pass through

B. the plants absorb them - these shorter wavelengths - and reradiate them in the form of longer wavelengths

C. the longer wavelengths cannot penetrate through the glass walls

D. All the above

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4

Resistance is measured in

A. Volts

B. Amperes

C. ohms

D. coulombs

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4

A lactometer is used to

A. find out the specific gravity of liquids

B. measure the volumes of liquids

C. test the purity of milk

D. determine the strength of acid in car batteries

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4

The ozone layer absorbs

A. Cosmic rays

B. Infrared rays

C. All radiations of light

D. Ultra violet rays coming from the sun

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4

In a vacuum the following three articles are dropped at the same time and from the lame height. Which will reach the ground quicker?

A. a stone

B. a piece of wood

C. a feather

D. all will reach the ground at the same time

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4

When a body is partly or wholly immersed in a liquid the apparent loss of weight is equal to the weight of the liquid displaced by the submerged portion. This is known as

A. Pascal's law

B. Bernoulli's law

C. Archimedes' law

D. Boyle's law

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4

The SI unit of electric current is

A. the ampere

B. the volt

C. the ohm

D. the coulomb

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4

A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by thermonuclear reactions is

A. a planet

B. a meteor

C. a star

D. a comet

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4

Enriched uranium means

A. Uranium that is very pure

B. Uranium in which the concentration of the isotope U-238 is more than in the naturally occuring uranium

C. Uranium in which the concentration of the isotope U-235 is more than in the naturally occuring uranium

D. None of the above

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4

The largest reserve of radioactive element which can be used in a nuclear reactor has been found in India, The name of the element is

A. Thorium

B. Uranium

C. Plutonium

D. Radium

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4

Which of the following revolves round the nucleus in an atom?

A. protons

B. electrons

C. neutrons

D. positrons

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4

The red colour of the setting sun is due to

A. the least scattered red colour reaching the eye

B. the dispersion of sun light occurred in air molecule in atmosphere

C. the diffraction of sunrays in atmospheric layers

D. interference of all the rays coming from the sun

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4

Astigmatism, a structural defect of the eye, is due to

A. the eye lens being thin

B. the eye lens being thick

C. lack of symmetry in the curvature of the eye preventing rays of light from being brought to a common focus

D. the pupil being very small

What is the correct answer?

4

When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light ray diminishes alter a few reflections. This is because of

A. poor reflection from the mirrors

B. scattering of light from the mirrors

C. absorption of some light by the mirrors

D. absorption of light by the atmosphere

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4

Some persons are not able to see distant objects clearly because the image of the object is focused in front of the retina. This defect is known as

A. short sight

B. long sight

C. astigmatism

D. presbyopia

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4

Out of the following, name the fluorescent substance.

A. quinine sulphate solution

B. paraffin oil

C. fluorescein solutions

D. All the above

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4

A radio set that uses valves does not start operating immediately when it is switched on whereas a set containing only tranaistors operates immediately. The reason for this is that

A. the valve filaments have low resistance

B. valve-radio sets work at a higher voltage

C. transistor set has a low resistance

D. filaments of the valves cake time to beat up and function

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4

A workman was working on a rail track. A young boy at a distance holds his ear close to the railway track. The boy was able to hear the sound of each blow or the workman twice. It is because

A. speed of sound is greater in steel than in air

B. speed of sound is greater in air than in steel

C. part of sound waves is reflected between rail tracks

D. the boy's ears are at a different distance from the source

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4

A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

A. conduction and convection only

B. conduction and radiation only

C. convection and radiation only

D. conduction, convection and radiation

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4

Cosmic rays are

A. powerful X-rays falling on the earth from space

B. ultraviolet rays from the sun

C. gamma rays from radioactive minerals

D. very energetic radiation falling upon the earth from outer space consisting chiefly of charged particles

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4

The electrical domestic tube light gives white fiourescent light because of

A. collision between molecules of filled gas under electric current

B. heavy current

C. vacuum inside the tube

D. falling of ultra violet rays on the white inner coating of the tube

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4

Drinks kept in a vacuum flask remain hot or cold as the case may be for a long time because

A. both walls are silvered on the vacuum side

B. there is vacuum between the double walls

C. the cork is a poor conductor of heat

D. of all the above

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4

The device that is used to measure the electromotive force of a cell is

A. an ammeter

B. a rheostat

C. a voltmeter

D. a voltameter

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4

The method used to separate aluminium from a alumina is

A. electroplating

B. electrotyping

C. electrolysis

D. distillation

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4

When are temperature resistance

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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4

An ammeter has

A. a high resistance

B. a very low resistance

C. no resistance at all

D. resistance of 400 ? w

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4

In a dynamo

A. mechanical energy is converted to light energy

B. mechanical energy is converted to heat energy

C. mechanical energy is converted to electrical energy

D. electrical energy is converted to mechanical energy

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4

In very cold countries alcohol is used as a thermometric liquid because

A. alcohol is a poor conductor of heat

B. alcohol can be coloured for its level to be seen easily

C. its freezing point is very low

D. it will not stick to the glass tube

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4

The nuclear model of atom was first visualised by

A. Rutherford

B. Neils Bohr

C. Albert Einstein

D. JJ Thompson