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Assertion : Animals curl into a ball, wh...

Assertion : Animals curl into a ball, when they feel very cold.
Reason : Animals by curling their body reduces the surface area.

A

Statement -`1` is True , Statement -`2` is True , Statement -`2` is correct explanation for Statement - `1`

B

Statement -`1` is True , Statement -`2` is True , Statement -`2` is not correct explanation for Statement - `1`

C

Statement -`1` is True , Statement -`2` is False.

D

Statement -`1` is False , Statement -`2` is True.

Text Solution

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The correct Answer is:
A
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(i) A poor emitter has a large reflectivity . Explain why. (ii) A copper tumbler feels much colder than a wooden block on a cold day. Explain why. (iii) The earth would become so cold that life is not possible on it in the absence of the atmosphere. Explain why? (iv) Why clear nights are cooler than cloudy nights? Why does a piece of red glass when heated and taken out glow with green light? (vi) Why does the earth not become as hot as the sun although it has been receiving heat from the sun for ages? (vii) Animals curl into a ball when they are very cool. Why? (viii) Heat is generated continuously in an electric heater but its temperature becomes constant after some time. Explain why? (ix) A piece of paper wrapped tightly on a wooden rod is observed to get charred quickly when held over a flame as compared to a similar piece of paper when wrapped on a brass rod. Explain why? (x) Liquid in a metallic pot boils quickly whose base is made black and rough than in a pot whose base is highly polished . Why?

Assertion : If Earth doesn't have atmosphere, than there will be very much cold. Reason : In convection, heat transfers through air.

Assertion : It is better to wash clothes by soap with cold liquid. Reason : The hot liquid of soap have less surface tension than cold one .

Assertion : Angle of repose is equal to angle of limiting friction. Reason : When the body is just at the point of motion, the force of friction in this stage is called as limiting friction.

Assertion : A needle placed carefully placed on the surface of water may float. Reason : When buoyant force balanced with weight of body, the body can float.

Assertion :- A ball is thrown from the edge of a very high clif. No matter what the angle at which it is thrown , due to air resistance, the ball will eventually end up moving vertically downward. Reason :- In horizontal direction there is a component of retarding force of air resistance alone.

Assertion: Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot. Reason: Resistance decreases due to decrease in tem perature and so current through wire increases.

Assertion: When a force vecF attempts to slide a body along a surface, a frictional force parallel to the surface and directed so as to oppose the sliding, is exerted on the body by the surface. Reason: It is due to the bonding between the body and the surface.

Assertion: Displacement of a body may be zero when distance travelled by it is not zero. Reason: The displacement is the longest distance between initial and final position.

ALLEN -GEOMETRICAL OPTICS-ASSERTION-REASON
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  2. Statement -1 : When hot water is poured in a beaker of thick glass, th...

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  3. Statement-1: Potential energy of water at 0^(@)C is more than ice at 0...

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  4. Statement-1: When an electric fan is switched on in a closed room, the...

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  5. Statement-1: Snow is better insulator than ice. Statement -2 : Snow ...

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  6. Assertion : Animals curl into a ball, when they feel very cold. Re...

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  7. Statement-1: A sphere, a cube and a thin circular plate made of same m...

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  8. Statement-1: High thermal conductivity of metals is due to presence of...

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  9. Statement -1 : Liquids usually expand more than solids. Statement-2:...

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  10. Statement-1: Water is considered unsuitable for use in thermometers. ...

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  11. Statement-1: Temperature of a rod is increased and again cooled to sam...

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  12. Statement-1: Coolant coils are fitted at the top of a refrigerator , f...

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  13. STATEMENT-1 For observing traffic at our back, we prefers to use a con...

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  14. STATEMENT-1 A convex lens may be diverging STATEMENT -2 The nature o...

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  15. STATEMENT-1 Hollow prism forms no spectra as a solid equilateral pris...

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  16. Statement-I : Sun glasses have zero power even through their surfaces ...

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  17. Statement-I : 11 English alphabets do not show lateral inversion. an...

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  18. Assertion : The images formed by total internal reflections are much b...

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  19. Assertion:Image formed by concave lens is not always virtual. Reason...

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  20. Statement-1 The formula connecting u,v and f for a spherical mirror is...

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