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4

A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

A. decreasing the radius of the capillary tube

B. increasing the radius of the capillary tube

C. increasing the height of water in the vessel

D. None of these

Correct Answer :

A. decreasing the radius of the capillary tube


Related Questions

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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

The aneroid barometer uses

A. mercury

B. distilled water

C. alcohol

D. does not use any liquid

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4

The earth satellite Aryabhatta was put in orbit by India on

A. October 20, 1978

B. November 14, 1978

C. January 26, 1979

D. April 19, 1975

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4

The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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4

Holography is the technique of

A. taking photos of various objects

B. recording and reproducing three dimensional images

C. tracing out planets and stars in the sky

D. transmitting light waves

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4

Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because

A. the speed with which it escapes cools it down

B. of the higher temperature of the surroundings

C. of sudden expansion causing loss of internal energy

D. there is no real fall in temperature

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4

When temperature decreases, resistance of metals to flow of electricity

A. increases

B. decreases

C. neither increases nor decreases

D. first increases then decreases

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4

The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is

A. Voltaic cell

B. Leclanche cell

C. Dry cell

D. An accumulator

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4

A timer in a race is at the finish line. He should start his stop watch

A. as soon as he hears the report of the gun

B. the moment he sees the flash

C. either (a) or (b) since that makes no difference

D. None of the above

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4

In a refrigerator cooling is produced by

A. the ice that deposits on the freezer

B. the evaporation of a volatile liquid

C. None of the above

D. Both (a) and (b)

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4

One finds it more difficult to walk on ice than on a concrete road because

A. there is more friction on ice than on concrete surface

B. ice is soft and spongy while concrete is hard

C. the friction between ice and the feet is less than that between the concrete and the feet

D. None of them

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4

Which mirror is used as a rear view mirror in Vehicles?

A. Parabolic

B. Convex

C. Concave

D. Plain

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4

Solar radiation is preferred to other sources of energy because

A. it is practically inexhaustible

B. it is the cheapest form of energy

C. it does not cause pollution

D. All of the above

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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

If you want a sound proof room, the walls should be

A. able to refract the sound

B. good absorbers of sound

C. good reflectors of sound

D. All the above

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4

The strength of an electromagnet can be increased by

A. increasing the length of the coiled wire

B. increasing current supply

C. increasing the size of the iron core

D. 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

When the resistance of a circuit increases the current will

A. increase

B. decrease

C. remain the same

D. None of the above

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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

While crossing a suspension bridge, the soldiers are ordered to break steps because

A. the marching in steps will involve a big strain on them

B. the resonant vibrations caused by their marching can damage the bridge increasing the amplitude to dangerous proportions

C. the marching may obstruct other traffic

D. rumblings of their marching may disturb the surroundings

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4

The function of a moderator in a nuclear reactor is

A. to absorb unwanted neutrons

B. to slow down the fast neutrons to secure more effective hits on other nuclei

C. to decrease the number of fissile nuclei

D. to increase the number of fissile nuclei

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4

The coil of an electric heater is made of

A. Platinum

B. Tungsten

C. Nichrome

D. Copper

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4

Velocity of sound in high altitudes is low because at such a height

A. the temperature is low

B. there is no air

C. the pressure is low

D. All the above

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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

Body A is kept in contact with body B. Heat will flow from A to B if

A. the heat content of A is greater than that of B

B. the temperature of A is greater than that of B

C. the specific heat of A is greater than that of B

D. the specific heat of B is greater than that of A

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4

The speed of light is minimum while passing through

A. air

B. glass

C. vacuum

D. water

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4

In a refrigerator cooling is produced by

A. the ice that deposits on the freezer

B. the evaporation of a volatile liquid

C. None of the above

D. Both (a) and (b)

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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

When a body Is taken to the poles from the equator, Its weight becomes

A. greater

B. less

C. the same

D. None of these

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A bullet is fired at a certain angle with the horizontal. Its path will be

A. elliptical

B. a straight line

C. a parabola

D. a vertical line