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4

A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

A. will increase

B. will decrease

C. does not change

D. varies with the increase of depth of the immersion of the iron piece

Correct Answer :

A. will increase


Related Questions

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The direction of heat flow between two objects depends on

A. their heat contents

B. their masses

C. their temperatures

D. whether they are in solid, liquid or gaseous state

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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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Which force is used when milk is churned to separate cream?

A. cohesive

B. centrifugal

C. frictional

D. gravitational

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Rain drops acquire spherical shape due to

A. viscosity

B. surface tension

C. friction

D. elasticity

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For an electron orbiting in a hydrogen atom, the necessary centripetal force keeping it in orbit is provided by

A. the electrical attraction between the negatively charged electron and the positively charged porton

B. the high speed of the electron

C. the low speed of the electron

D. gravity

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4

Red Light is used as a dancer signal because

A. it is pleasing to the eye

B. it has a traditional colour

C. it is easily distinguishable

D. it is most sensitive to the human eye

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Lightning is produced when

A. similar charges of electricity rush towards each other and then get repelled

B. clouds strike against impurities in air and the friction burns up these impurities

C. strong opposite charges in different clouds break down the resistance offered by the intervening air

D. water vapour produces electricity in the clouds

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A wire conveying a current deflects a pivoted magnetic needle. This was discovered by

A. Marconi

B. Oersted

C. Faraday

D. Ohm

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The Cact that the compass needle does not point true north was observed first by

A. Sir Isaac Newton

B. Columbus

C. Archimedes

D. Thomas Alva Edison

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When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy in the form of electromagnetic wave pulses called

A. neutrons

B. electrons

C. phonons

D. photons

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A person cups his hand around the mouth when shouting. Why?

A. Sound energy from his mouth is then directed in one direction

B. The cupped hand acts as a cardboard tube of short length

C. The pitch of sound increases

D. Both (a) and (b)

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Dioptre is the unit of power of

A. convex mirrors

B. concave mirrors

C. concave lenses

D. lenses irrespective of types

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Which of the following can produce electricity?

A. resistor

B. thermocouple

C. light bulb

D. neon tube

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The attraction between similar molecules is called

A. inertia

B. adhesion

C. cohesion

D. friction

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The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the world was

A. Albert Einstein

B. Enrico Fermi

C. HJ Bhabha

D. Sir Isaac Newton

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Compared to the atomic bomb, the destructive power of a hydrogen bomb is

A. greater

B. less

C. equal

D. can't be determined

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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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Out of the following which is an insulator?

A. Silver

B. Copper

C. Nichrome

D. Dry wood

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We see the flash of lightning before hearing the thunder because

A. light travels very much faster than sound

B. sound travels faster than light

C. lightning occurs nearer than thunder

D. both travel at the same speed

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The image of an object formed in a plane mirror

A. is real

B. is virtual

C. can be obtained on a screen

D. is slightly bigger than the object

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A tube light works on the principle of

A. chemical, heating and magnetic effects of electricity

B. discharge of electricity through gases

C. the action of ultraviolet radiation on certain fluorescent materials

D. Both (b) and (c) above

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The power of a lens is

A. equal to its focal length

B. equal to its radius of curvature

C. equal to the reciprocal of its focal length (in metres)

D. equal to twice its focal length

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The instrument used to measure atmospheric pressure is

A. Pyrometer

B. Eudiometer

C. Barometer

D. Hydrometer

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The best estimates of the age of the earth comes from the studies of

A. angle of inclination of the earth

B. changes in radio-active minerals in it

C. period taken by Sun's light to reach the earth

D. artificial satellites revolving round the earth

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Photocells are used

A. in burglar alarms

B. in automotive devices for light switches

C. television cameras

D. All the above

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A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?

A. It will go down

B. It will come up

C. It will remain at the same level

D. First it will go down and it will come up

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The function of a ruse wire is

A. to stabilise the voltage

B. to decrease the current supply

C. to increase the current supply

D. to prevent an unduly high current from passing through a circuit

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A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by

A. enclosing it in a thick walled iron box

B. wrapping it with an insulator

C. by placing it inside a glass case

D. by surrounding it with fine copper gauze

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An electric fan converts

A. electrical energy into heat energy

B. electrical energy into mechanical energy

C. mechanical energy into electrical energy

D. mechanical energy into heat energy

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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