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4

The speed of sound in air at 0° C is approximately

A. 4 x 108 m/s

B. 1500 m/s

C. 330 m/s

D. 500 m/s

Correct Answer :

C. 330 m/s


Related Questions

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4

The first Indian Satellite launched from a Russian Cosmodrome on April 16, 1975 was named

A. Bhaskara

B. Insat I-A

C. Aryabhatta

D. SLV-l

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4

Besides protons, the nucleus of an atom contains

A. electrons

B. neutrons

C. neutrons and electrons

D. electrons, neutrons and other particles

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4

In compact porous soil, the rising of the water is due to

A. capillarity

B. cohesion

C. adhesion

D. viscosity

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4

The following are the atmospheric zones above the surface of the earth:
A) Troposphere
B) Ionosphere
C) Stratosphere
D) Exosphere
Select the correct sequence from the earth's surface on the basis of the codes given below:

A. ACBD

B. ABCD

C. CABD

D. BACD

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4

A person does not sink in the Dead Sea because

A. the sea contains a large amount of other salts besides sodium chloride

B. the density of the person is less than the density of the Dead Sea water

C. of the surface tension due to salt water in the Dead Sea

D. of difference in mass

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4

Which of the following can produce electricity?

A. resistor

B. thermocouple

C. light bulb

D. neon tube

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4

Less dew is formed on cloudy nights because

A. there is no moisture in the atmosphere

B. clouds absorb the falling dew

C. objects emit radiant energy very fast on such nights

D. objects lose less radiant energy

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4

The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is

A. Hygrometer

B. Hypsometer

C. Hydrometer

D. Densimeter

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4

The electron has a mass equal to

A. 1.9 x 10-13 kg

B. 9.1 x 10-31 kg

C. 1 x 10-15 kg

D. 1.6 x 10-19 kg

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4

The filament used in the electric lamp is made of

A. nichrome

B. tungsten

C. copper

D. aluminium

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4

Nuclear fission process means

A. absorption of a neutron by a nucleus

B. breakup of the nucleus of a heavy atom into two nearly equal halves emitting two or three neutrons and releasing large amounts of nuclear energy in the process

C. the scattering of neutrons

D. formation of heavier nucleus

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4

Heat transfer

A. cools the body that transfers it

B. heats the body that absorbs the heat

C. may change the physical state of the substance

D. All the above

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4

Every action has an equal and opposite reaction is Newton's law of Motion

A. first

B. second

C. third

D. fourth

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4

Photoelectric cell is a device which converts

A. light energy into electrical energy

B. electrical energy into light energy

C. magnetic energy into electrical energy

D. electrical energy into mechanical energy

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4

The number of electrons in the outer orbits of a nucleus gives

A. the mass number

B. atomic number

C. atomic weight

D. absolute number

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4

Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days

A. the pores in the pot are closed

B. rain water stops oozing out from the pores

C. the water that oozes out does not evaporate quickly because of the large percentage of moisture in the air

D. surface of the pot becomes damp

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4

The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the boning point of water at a hill top

A. is more than at sea level

B. is equal to that sea level

C. is less than at sea level

D. depends on the surrounding temperature

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4

Which of the following is known as freon?

A. Liquid ammonia

B. Carbon tetrafluoride

C. Dichloro-difluoro-methane

D. Sulphur dioxide

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4

For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa

A. telescope

B. spectrometer

C. microscope

D. periscope

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4

The velocity of sound in air

A. increases as the square root of the absolute temperature

B. decreases with temperature

C. is independent of temperature

D. None of these

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4

Which physical quantity is measured in watts

A. power

B. kinetic energy

C. momentum

D. impulse

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4

The world's first artificial satellite Sputnik I was launched by Russia in

A. 1985

B. 1957

C. 1959

D. 1960

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4

A bar magnet tied in the middle with a thread is suspended at the South Pole of the earth. The magnet will be in

A. a horizontal position

B. a nearly vertical position with its South Pole downwards

C. a nearly vertical position with its North Pole downwards

D. a slanting position

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4

For accurate scientific work, temperatures are often measured by

A. mercury thermometers

B. alcohol thermometers

C. platinum resistance thermometers

D. thermoelectric thermometers

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4

In the visible spectrum which colour has the shortest wavelength?

A. Red

B. Blue

C. Yellow

D. Violet

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4

The number of galaxies that are visible without telescope on clear dark nights and away from bright lights is

A. one

B. two

C. three

D. infinite

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4

The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications of

A. Pascal's law

B. Principle of Archimedes

C. Boyle's law

D. Hooke's law

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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

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

Which physical quantity is measured in watts

A. power

B. kinetic energy

C. momentum

D. impulse