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4

Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water

A. increases to a great extent

B. increases slightly

C. decreases slightly

D. decreases rapidly

Correct Answer :

C. decreases slightly


Related Questions

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4

The colour of the light which travels through glass with minimum speed is

A. red

B. violet

C. green

D. yellow

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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

Solids have definite shapes. This is because

A. the forces of cohesion of the molecules within are very much less in them

B. the forces of cohesion are very large

C. the forces of adhesion are large

D. the forces of adhesion are less

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4

In hot climatic conditions, the buildings are painted white because

A. white paint is economical

B. it does not fade off

C. it does not crack with higher temperature

D. white coating is a bad conductor of heat and reflects heat rays that fall on it, thus keeping the inside cool

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The heating element often used in an electric iron is

A. copper

B. tungsten

C. mica

D. nichrome

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A balloon ruled with hydrogen will

A. continue going upwards uninterrupted

B. reach a particular height and remain floating

C. burst after reaching some height

D. reach a particular height and start coming down

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4

We cannot see and without the aid of a telescope

A. Neptune and Pluto

B. Jupiter and Saturn

C. Venus and Mars

D. Venus and Saturn

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4

We always see only one side of the moon because

A. the sun comes in between the earth and moon

B. the moon is stationary

C. the time taken by the moon to rotate on its axis is the same as the time taken by it to revolve round the earth

D. moon revolves round the sun

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4

In a dynamo

A. mechanical energy is converted to light energy

B. mechanical energy is converted to heat energy

C. mechanical energy is converted to electrical energy

D. electrical energy is converted to mechanical energy

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4

When a swing is drawn to a side Its potential energy In relation to the earth

A. increases

B. decreases

C. remains the same

D. is constant

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Chronometer la an instrument to measure

A. heat

B. electric potential

C. time

D. distance between two points

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In a hydraulic pressure

A. force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston

B. the distance the small piston moves is equal to the distance the large piston moves

C. applied pressure is equally transmitted throughout the liquid in all directions

D. force acting on small piston is equal to the force acting on large piston

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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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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

X-rays are used

A. in hospital in the treatment of malignant growth

B. to reveal hidden flaws in metal castings and welded joints

C. to detect alterations made in works of art

D. All the above

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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 mass number and the atomic number of an element are X and Y respectively. The number oC neutrons in the atom of that element is

A. X

B. Y

C. X + Y

D. X Y

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4

When the velocity of a body is halved

A. its momentum is halved

B. its kinetic energy is halved

C. its acceleration is halved

D. its potential energy is halved

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4

In experiments on static electricity the standard method for obtaining small amounts of positive electricity is to rub

A. a glass rod with flannel

B. an abonite rod with flannel

C. a glass rod with silk

D. Any of the above

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4

Which metal is used in storage batteries?

A. Copper

B. Lead

C. Tin

D. Iron

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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

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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4

Solids have definite shapes. This is because

A. the forces of cohesion of the molecules within are very much less in them

B. the forces of cohesion are very large

C. the forces of adhesion are large

D. the forces of adhesion are less

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4

The planet that spins Caster than any other planet is

A. Saturn

B. Jupiter

C. Earth

D. Mercury

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Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are

A. a -rays

B. � -rays

C. ? -rays

D. Cosmic rays

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4

The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

A. Bernoulli's principle

B. Magnetic properties of the ship's material

C. Newton's third law of motion

D. Earth's gravitational force

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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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4

Why is nuclear fusion also known as thermonuclear reaction?

A. Fusion converts nuclear energy into heat

B. Fusion demands conditions of extremely high temperature to produce it

C. Fusion produces large amount of heat

D. Fusion reactions takes place in the sun

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4

When an electric apparatus is fitted with a three core flexible lead the insulation on the three wires is distinctively coloured. The present international convention is

A. brown for earth, yellow for live, light blue for neutral

B. green for earth, yellow for live, brown for neutral

C. yellow for earth, green for live, brown for neutral

D. brown or red for live, light blue or black for neutral and green or yellow for earth

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4

The instrument used to measure atmospheric pressure is

A. Pyrometer

B. Eudiometer

C. Barometer

D. Hydrometer