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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

Correct Answer :

C. four times


Related Questions

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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

Sound waves in air are

A. transverse

B. longitudinal

C. transverse and longitudinal

D. neither transverse nor longitudinal

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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

Which of the following rays has the highest penetrative power?

A. a -rays

B. � -rays

C. ? -rays

D. X-rays

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4

Choose the correct answer

A. Microphone converts sound energy into electrical energy.

B. Electric fan converts electrical energy into mechanical energy.

C. Battery converts chemical energy into electrical energy.

D. All the above

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Hydrophone is an instrument used

A. for measuring relative density of liquids

B. by ships to pass on messages

C. for determining the depth of ocean bottoms etc.

D. by deaf people to aid hearing

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A pressure gauge for fluids is called

A. a hydrometer

B. a manometer

C. a lactometer

D. an anemometer

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4

A ruse wire is characterised by

A. high resistance and high melting point

B. high resistance and low melting point

C. low resistance and high melting point

D. low resistance and low melting point

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4

The asteroids belt lies between the orbits of

A. Earth and Mars

B. Venus and Earth

C. Mars and Jupiter

D. Moon and Mars

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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

A lightning conductor installed in a building

A. does not allow the lightning to fall on the building at all

B. drives away the charged clouds

C. forces the lightning to fall on other buildings near that building

D. conducts the electric charges to the ground when lightning strikes the building

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4

When a bullet is fired from a gun

A. the gun moves forward

B. the gun jumps up

C. the gun does not move

D. the gun recoils with the same momentum as the bullet

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4

A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

A. at the lower elevation than the bird

B. at a higher elevation than the bird

C. in the same direction as the bird

D. vertically upwards

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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

Cyclotron is an apparatus used

A. as an accelerator for imparting energies to charged particles of atomic magnitudes

B. to reduce the charge on a particle

C. to produce intense magnetic field

D. to produce intense electrical field

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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

On the Kelvin scale, the melting point of ice is

A. 0 K

B. 273 K

C. 373 K

D. 100 K

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Railway tracks are banked on curves so that

A. the necessary centrifugal force may be obtained from the horizontal component of the weight of the train

B. the frictional force between the track and the wheels is avoided

C. the necessary centripetal force may be derived from the horizontal component of the weight of the train

D. None of these

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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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Sound travels fastest in

A. air

B. water

C. iron

D. vacuum

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A stationary elevated object has

A. kinetic energy

B. potential energy

C. momentum

D. both potential and kinetic energy

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An ohm is a unit of

A. potential difference

B. resistance

C. current

D. All the above

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4

The cover of a solar cooker is made of glass because

A. it absorbs sun's rays

B. it reflects sun's rays

C. it retains the heat inside by the greenhouse effect

D. it radiates heat better than metals

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4

The principle of equivalence of mass and energy was established by

A. Dalton

B. Rutherford

C. Einstein

D. Planck

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4

Sound waves In 'air travel faster if

A. frequency is higher

B. wavelength is smaller

C. pitch is smaller

D. air is warmer

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4

Meteors

A. look like falling stars

B. are really pieces of rock or metal

C. burn up as they shoot through the air

D. All the above

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4

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

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4

Acoustics is a property or

A. Physics

B. Chemistry

C. Biology

D. Economic

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The radius of an atom is approximately

A. 10-10 cm

B. 10-12 cm

C. 10-13 cm

D. 10-16 cm

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Mercury is used in thermometers because

A. it has high thermal conductivity

B. it has uniform expansivity

C. it has high boiling point and low freezing point

D. of all the above