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4

A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure

A. is found by measuring the slanting height of the mercury column

B. is given by the vertical height

C. cannot be measured with it

D. can be measured by both the methods described above

Correct Answer :

B. is given by the vertical height


Related Questions

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4

In the fuse of an electrical installation blows out

A. replace the fuse by a thin wire

B. replace the fuse by a thick copper wire

C. replace the fuse by a fuse wire of proper rating

D. replace the fuse by nichrome wire

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4

The unit of power in SI is

A. Joule

B. Newton

C. Joule/Sec

D. Erg/Sec

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4

Why is nuclear fusion also known as thermonuclear reaction?

A. Fusion converts nuclear energy into heat

B. Fusion demands conditions of extremely high temperature to produce it

C. Fusion produces large amount of heat

D. Fusion reactions takes place in the sun

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4

The air inside an electric, bulb is removed to prevent

A. oxidation of the tungsten filament

B. bursting of the bulb

C. loss of light due to absorption

D. keeping the weight of the bulb less

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4

When water is cooled from 4�C to 2�C its density

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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4

Isotones are species of atoms containing

A. same number of protons but different number of neutrons

B. same number of neutrons but different number of protons

C. the same total number of protons and neutrons

D. same number of protons and different number of electrons

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4

The velocity of sound in a medium is

A. directly proportional to its pressure

B. inversely proportional to the square root of its pressure

C. directly proportional to the square root of its pressure

D. independent of its pressure

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4

Fish and other aquatic creatures can live inside a deep frozen pond because

A. fish are cold-blooded animals

B. ice is a bad conductor of heat

C. there will always be water just beneath the ice level

D. they can adapt themselves to live in ice

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4

If the speed of the rotation of the earth increases the weight of a body

A. will increase

B. will decrease

C. will have no change

D. will either increase or decrease

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4

If a body is taken from the earth to the moon

A. both its mass and weight will be different

B. its mass will be different but the weight will remain the same

C. its mass and weight will both remain unchanged

D. its mass will remain the same but weight will be different

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4

Which of the following apparatus is used in the electrolysis of water?

A. Voltmeter

B. Voltameter

C. Ammeter

D. Potentiometer

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4

A proton is

A. the ionised hydrogen molecule

B. the nucleus of helium atom

C. the nucleus of hydrogen atom

D. the positive counterpart of electron

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4

When ice just melts

A. there is no change in volume

B. there is no change in temperature

C. heat is given out

D. there is no change of state

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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

The presence of impurities

A. lowers the melting point of ice

B. raises the melting point of ice

C. has no effect on the melting point of ice

D. may lower or raise the melting point depending upon the type of impurities

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4

It is difficult to bon potatoes at the top or a mountain because

A. the water available is hard

B. it is colder than at sea level

C. the potatoes become hard

D. the boiling point of water is lower at that height on account of low atmospheric pressure

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4

In an electrical circuit, a fuse is connected

A. in the live wire

B. in the neutral wire

C. in the earth wire

D. anywhere

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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 orbit of Venus lies between those of

A. Mercury and Earth

B. Earth and Mars

C. Mars and Saturn

D. Mars and Jupiter

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4

Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water

A. increases to a great extent

B. increases slightly

C. decreases slightly

D. decreases rapidly

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4

X-rays are used

A. in hospital in the treatment of malignant growth

B. to reveal hidden flaws in metal castings and welded joints

C. to detect alterations made in works of art

D. All the above

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4

The image of an object formed on the retina of the eye is

A. virtual and upright

B. virtual and inverted

C. real and inverted

D. real and upright

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4

How is it that Pluto is not always the farthest planet of the solar system?

A. Each planet becomes the farthest planet in its turn. Now it is the turn of Piuto

B. The Sun is now in the zodiac in which it is nearest to outer planets

C. The eccentricity of Piuto's orbit being substantial, this orbit cuts the orbit of Neptune

D. Piuto belongs to other solar system

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4

The force of attraction or repulsion between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of distance between them. This was propounded by

A. Coulomb

B. Gilbert

C. Volta

D. Rutherford

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4

At what temperature do the Fahrenheit and Kelvin scales give the same reading?

A. 212°

B. 32°

C. -40°

D.

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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

The image formed by a plane mirror is

A. of the same size as the object

B. at the same distance behind the mirror as the object is in front of it

C. virtual and laterally inverted

D. All the above

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4

The end product in the uranium disintegration series is

A. lead

B. zinc

C. carbon

D. tin

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4

Out of the following which is an insulator?

A. Silver

B. Copper

C. Nichrome

D. Dry wood

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4

The distance between two bodies is halved. Now the force of attraction between them will be

A. half

B. one fourth

C. four times

D. two times