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4

A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A. increase

B. decrease

C. remain the same

D. first decrease and then increase

Correct Answer :

B. decrease


Related Questions

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Resistance is measured in

A. Volts

B. Amperes

C. ohms

D. coulombs

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4

In the case of bodies falling under gravity which of the following remains constant at a given place?

A. kinetic energy

B. potential energy

C. acceleration

D. All the above

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4

Some persons are not able to see distant objects clearly because the image of the object is focused in front of the retina. This defect is known as

A. short sight

B. long sight

C. astigmatism

D. presbyopia

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4

When ice melts, Its volume

A. decreases

B. increases

C. remains the same until all the ice has melted and then increases

D. remains the same

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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

The rate of cooling of a hot body depends on

A. the nature of the radiating surface

B. area of the radiating surface

C. temperature difference between the body and the surroundings

D. All the above

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4

The audible range of a normal human ear is frequencies ranging from

A. 10000 to 20000 Hz

B. 50 to 15000 Hz

C. 20 to 20000 Hz

D. 15 to 50000 Hz

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4

The spectrum of white light can be studied by

A. a microscope

B. a telescope

C. a stereoscope

D. a spectroscope

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4

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

An astronomical unit of distance is

A. a kilometre

B. light year

C. the average distance from the earth to the sun

D. None of the above

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4

Air pressure is usually highest when the air is

A. warm and moist

B. cool and dry

C. warm and dry

D. cool and moist

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4

Alpha particles are

A. electromagnetic radiations

B. helium nuclei

C. negatively charged particles

D. neutral particles

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4

A pressure gauge for fluids is called

A. a hydrometer

B. a manometer

C. a lactometer

D. an anemometer

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4

When light travels from one medium to another there is a change in its

A. velocity

B. wavelength

C. frequency

D. Both (a) and (b) above

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4

On applying a constant force to a mass, It moves with a uniform

A. velocity

B. momentum

C. acceleration

D. angular velocity

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Two tumblers stuck together can be separated by

A. pouring ice cold water into the inner tumbler

B. pouring ice cold water on the outer tumbler

C. pouring hot water into the inner tumbler

D. dipping both the tumblers in hot water

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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

You want a supply of a small but constant current. Which of the following cells will you prefer?

A. Daniell cell

B. Leclanche cell

C. Dry cell

D. All the above

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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

The filament lamp is an example for

A. fluorescence

B. incandescence

C. both (a) and (b)

D. None of these

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4

Which part of the eye photographic camera?

A. Lens

B. Iris

C. Retina

D. Eyelid

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4

Rain drops acquire spherical shape due to

A. viscosity

B. surface tension

C. friction

D. elasticity

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4

Which of the following is wrongly matched?

A. electric current - ampere

B. resistance - Ohm

C. electric power - volt

D. electric charge Coulomb

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4

Gamma radiations are used for

A. sterilising food stuff

B. controlling pests

C. cancer therapy

D. All of these

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4

Who discovered that the Cree Call acceleration Is the same for any object at a given place?

A. Newton

B. Pascal

C. Archimedes

D. Galileo

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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 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 characteristics of a musical note are

A. loudness

B. pitch

C. quality or timbre

D. All the above

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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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When the earth reaches its perihelion

A. it is nearest to the moon

B. it is nearest to the sun

C. it is nearest to Pluto

D. it is farthest from the sun