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4

When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on

A. the immersed volume of the body

B. density of the liquid

C. acceleration due to the gravity at the place

D. All the above

Correct Answer :

D. All the above


Related Questions

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The Indian Satellite System used for domestic communications, television and meteorology is known as

A. INSAT

B. Bhaskara

C. Aryabhatta

D. All the above

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4

When a steel ball is placed on the surface of mercury, it does not sink because

A. of the surface tension of mercury

B. mercury is a semi-solid

C. of the high viscosity of mercury

D. the density of mercury is greater than that of steel

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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

Pieces of camphor placed on water move about rapidly. This is because of

A. diffusion

B. viscosity

C. surface tension

D. capillarity

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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

The stars that shine brightly then dimly and then brightly are known as

A. meteors

B. binaries

C. variable stars

D. bright stars

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4

A permanent magnet may be demagnetised by

A. placing it inside a solenoid through which an alternating current is flowing

B. heating the magnet to redness and then allowing it to cool

C. dropping it several times or hammering it while lying east-west

D. All the above

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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

The maximum range of most TV signals is from 121 to 240 km only because

A. the curvature of earth limits the range of reception

B. the signals are weak

C. the signals are absorbed by air

D. the antennae are not powerful enough

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4

In a refrigerator, the refrigerant is

A. Nitrogen

B. Oxygen

C. Chlorine

D. Freon

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4

Nuclear fusion is a process in which

A. the atoms and molecules lose their identity

B. nucleus is split into fragments

C. the nuclear reaction between two light atomic nuclei results in the formation of a heavier nucleus with release of a large quantity of nuclear energy in the process

D. absorption of neutron by a nucleus

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4

Stars twinkle because of

A. refraction of light from them through air

B. reflection

C. absorption

D. All the above

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4

Sound waves

A. are electromagnetic waves

B. can easily pass through vacuum

C. are always transverse waves

D. require a material medium for propagation

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4

Radio waves sent out by radio stations are reflected by

A. troposphere

B. stratosphere

C. mesosphere

D. ionosphere

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4

Which is the densest planet of the solar system?

A. Sun

B. Jupiter

C. Mercury

D. Earth

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4

It is easier to climb down a staircase than climb up because in climbing down

A. work is done against gravity

B. the steepness of the staircase isn't felt

C. gravity assists

D. there is no friction between the legs and steps

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4

The brightest planet in the Solar System is

A. Jupiter

B. Mercury

C. Venus

D. Sirius

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4

Mica is used in an electric iron because it is a

A. good conductor of heat

B. good conductor of electricity

C. bad conductor of electricity

D. Both (a) and (b) above

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4

The largest planet in the solar system is

A. Neptune

B. Uranus

C. Jupiter

D. Saturn

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4

The colour or an opaque object is due to the colour it

A. absorbs

B. refracts

C. reflects

D. scatters

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4

The body of an electrical appliance is earthed in order that

A. electricity may not leak

B. there may be smooth flow of electricity

C. a short circuit may be prevented

D. current may pass to the earth in case of a short circuit without doing any harm to the person

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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

A man weighing 50 kg floats on water in a lake. His apparent weight is

A. 50 kg

B. 45 kg

C. zero

D. 150 kg

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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

A device used in a ship for the purpose of measuring the depth of the sea is

A. an altimeter

B. a fathometer

C. a hydrometer

D. a sonometer

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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

If you want to open a door with les difficulty you push it

A. at the middle

B. at a point away from the hinge (near the rim)

C. near the hinge

D. None of the above

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4

Match the following:
A. Manometer1. Depth of sea
B. Audiometer2. High temperatures
C. Pyrometer3. Level of human hearing
D. Fathometer4. Pressure of a gas

A. A-1 B-4 C-3 D-2

B. A-4 B-3 C-1 D-2

C. A-4 B-3 C-2 D-1

D. A-3 B-4 C-1 D-2

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4

In a river, the currents are fastest where the river la

A. wide and shallow

B. narrow and shallow

C. wide and deep

D. narrow and deep

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4

The method used to separate aluminium from a alumina is

A. electroplating

B. electrotyping

C. electrolysis

D. distillation