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Statement -1: The steam at 100^(@)C caus...

Statement -`1`: The steam at `100^(@)C` causes more severe burn to human body than the water at `100^(@)C`.
Statement-`2` : The steam has greater internal energy due to latent heat of vaporization.

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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In an industrial process 10 kg of water per hour is to be heated from 20^@C to 80^@C . To do this steam at 150^@C is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at 90^@C . How many kilograms of steam is required per hour (specific heat of steam =1 cal//g^@C , Latent heat of vapourization =540 cal//g )?

In an industrial process 10 kg of water per hour is to be heated from 20^@C to 80^@C . To do this steam at 150^@C is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at 90^@C . How many kilograms of steam is required per hour (specific heat of steam =1 cal//g^@C , Latent heat of vapourization =540 cal//g )?

Statement- 1 : Potential energy of water at 0^(@)C is more than ice at 0^(@)C . Statement- 2 : Heat given to melt ice at 0^(@)C is used up in increasing the potential energy of water molecules formed at 0^(@)C .

A metal rod AB of length 10x has its one end A in ice at 0^@C , and the other end B in water at 100^@C . If a point P one the rod is maintained at 400^@C , then it is found that equal amounts of water and ice evaporate and melt per unit time. The latent heat of evaporation of water is 540cal//g and latent heat of melting of ice is 80cal//g . If the point P is at a distance of lambdax from the ice end A, find the value lambda . [Neglect any heat loss to the surrounding.]

A stone of 0.36 m^(2) cross -sectional area and 0.1 m thickness has its lower surface in contact with water at 100^(@)C and upper surface in contact with ice at 0^(@)C . If 4.8 kg ice melting in 1 hour, then what is the thermal conductivity of stone ? Latent heat of fusion of ice is 3.36xx10^(5)" J/kg" .

2g ice at 0^(@)C is mixed with 1 g steam at 100^(@)C . Find the final temperature of the mixture.

One g of water at 373K is converted into steam at the same temperature. The volume 1 cm^(3) of water becomes 1671 cm^(3) on boiling. Calculate the change in internal energy of the system , if heat of vaporisation is 540 cal g^(-1) . Given standard atmospheric pressure =1.013xx10^(5) Nm^(-2) .

1kg ice at 0^(@)C is mixed with 1kg of steam at 100^(@)C . What will be the composition of the system when thermal equilibrium is reached ? Latent heat of fusion of ice = 3.36xx 10^(6)J kg^(-1) and latent heat of vaporization of water = 2.26 xx 10^(6)J kg^(-1)

Steam is passes into 22 g of water at 20^@C . The mass of water that will be present when the water acquires a temperature of 90^@C , (Latent heat of steam is 540 cal//g ) is

ALLEN -GEOMETRICAL OPTICS-ASSERTION-REASON
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  2. Statement I: The bulb of one thermometer is spherical while that of th...

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  4. Statement -1 : A gas is taken from state A to state B through two diff...

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  5. Statement-1: On sudden expansion a gas cools. Statement -2 : On sudd...

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  6. Assertion: The isothermal curves intersect each other at a certain poi...

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  7. Assertion: In a thermodynamic process, initial volume of gas is equal ...

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  8. Statement I: Two solid cylindrical rods of identical size and differen...

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  9. Assertion: When a bottle of cold carbonated drink is opened, a slight...

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  10. Statement-1: Equal amount of heat is supplied to two identical spheres...

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  11. Assertion : Temperature near the sea-coast are moderate. Reason : Wa...

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  12. Statement-1 : A cloudy night is hotter than a clear sky night. State...

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  13. Statement -1 : When hot water is poured in a beaker of thick glass, th...

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

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

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

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

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

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

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

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