EASY

Earn 100

Will the value of specific latent heat of a substance change if the scale is $° F$ instead of $° C$ ?

Important Questions on Calorimetry

HARD

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

10 H

inductor carries a current of

20 A

. If the energy stored in this inductor melts ice at

0 ° C,

then the mass of the ice melted is

[

Latent heat of ice

= 2.26 \times 10^{3} J {kg}^{- 1}]

EASY

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

A piece of ice falls from a height

h

so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of

h

is:
(Latent heat of ice is

3.4 \times 10^{5} {J kg}^{- 1}

and

g = 10 {N kg}^{- 1}

)

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

A solid metal weighing

150 g

melts at its melting point of

800 ° C

by providing heat at the rate of

100 W

. The time taken for it to completely melt at the same temperature is

4 \min

. What is the specific latent heat of fusion of the metal?

HARD

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

A thermally insulated cubical box of side length $20 cm$ and wall thickness $2 cm$ containing $2 kg$ of ice is closed on all sides. The mass of ice melted in $10$ hours is (Thermal conductivity of the material of the box $= 0.01 {Wm}^{- 1} K^{- 1},$ latent heat of ice $= 360 \times 10^{3} J {kg}^{- 1}$ and ambient temperature $= 40 ° C$ )

EASY

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

Latent heat of vaporisation of water is

22.6 \times 10^{5} J {kg}^{- 1}

. The amount of heat needed to convert

100 kg

of water into vapour at

100 ° C

EASY

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

A closed bottle containing water at

30^{o} C

is open on the surface of the moon. Then-

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

1 kg

of water, at

20 ° C

is heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of

20 Ω .

The rms voltage in the mains is

200 V

. Ignoring heat loss from the kettle, time taken for water to evaporate fully is close to
[ Specific heat of water

= 4200 J {kg}^{- 1} ° C^{- 1}

Latent heat of water

= 2260 k J k g^{- 1}

]

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

A thermally insulated vessel contains

150 g

of water at

0 ° C

. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at

0 ° C

itself. The mass of evaporated water will be closest to: (Latent heat of vaporization of water

= 2.10 \times 10^{6} J k g^{- 1}

and Latent heat of Fusion of water

= 3.36 \times 10^{5} J k g^{- 1}

)

HARD

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

A lead bullet just melts when stopped by an obstacle. Assuming that 25% of heat is absorbed by the obstacle, find the minimum velocity of the bullet if its initial temperature is 27^oC (melting point of lead = 327^oC; specific heat of lead = 0.03 cal/g^oC; latent heat of fusion of lead = 6 cal/g and
J = 4.2 J/cal).

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

An experiment takes

10 \min

to raise the temperature of water from

0 ° C

and

100 ° C

and another

55 \min

to convert it totally into steam by a stabilized heater. The latent heat of vaporization comes out to be,

EASY

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

When

1 k g

of ice at

0 ° C

turns into water at

0 ° C

, the resulting change in its entropy, taking the latent heat of ice to be

80 c a l g^{- 1}

HARD

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

It takes

10

min for an electric kettle to heat a certain quantity of water from

0 ° C

100 ° C

. It takes

54

min to convert this water at

100 ° C

into steam. Then latent heat of steam is

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

100^{°} C

the volume of

1 kg

of water is

10^{- 3} m^{3}

and volume of

1 kg

of steam at normal pressure is

1.671 m^{3}

. The latent heat of steam is

2.3 \times 10^{6} J / kg

and the normal pressure is

10^{5} N / m^{2}

. If

5 kg

of water at

100^{°} C

is converted into steam, the increase in the internal energy of water in this process will be

HARD

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

An earthen pitcher loses

1 g

of water per minute due to evaporation. If the water equivalent of pitcher is

0.5 kg

and the pitcher contains

9.5 kg

of water, calculate the time required for the water in the pitcher to cool to

28 ° C

from its original temperature of

30 ° C

. Neglect radiation effects. Latent heat of vapourization of water in this range of temperature is

580 cal g^{- 1}

and specific heat of water is

1 kcal {kg}^{- 1} ° C^{- 1}

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

Water at

0 ° C

, contained in a closed vessel, is abruptly opened in an evacuated chamber. If the specific latent heats of fusion and vaporization at

0 ° C

are in the ratio

λ : 1

, the fraction of water evaporated will be

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

The sprinkling of water reduces the temperature of a closed room slightly because,

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

Steam at 100°C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15°C till the temperature of the calorimeter and its contents rises to 80°C, The mass of the steam condensed in kg is

EASY

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

When the room temperature becomes equal to the dew point, the relative humidity of the room is

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

The rays of sun are focused on a piece of ice through a lens of diameter

5 cm

, as a result of which

10 g

ice melts in

10 \min

. The amount of heat received from sun per unit area per unit time is

MEDIUM

Science>Physics>Calorimetry>Latent Heat and Specific Latent Heat

2 g of water condenses when passed through 40 g of water initially at 25

℃

. The condensation of steam raises the temperature of water to 54.3

℃

. What is the latent heat of steam?

Will the value of specific latent heat of a substance change if the scale is °F instead of °C?

Important Questions on Calorimetry

Learn and Prepare for any exam you want !

Will the value of specific latent heat of a substance change if the scale is $° F$ instead of $° C$ ?