The specific heat capacity of a substance A is 3 , 800 J kg - 1 K - 1 and that of a substance B is 400 J kg - 1 K - 1 . Which of the two substances is a good conductor of heat? Give a reason for your answer.

The specific heat capacity of a body is the amount of heat required to increase the temperature of a unit mass of that body through 1 ° C or 1 K . So substance B is a good conductor of heat because its specific heat capacity is low, due to this it takes less heat to raise its temperature and transfer more amount of heat through it compared to substance A . All the conductors will have less specific heat capacity.

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Liquid ammonia is used in an ice factory for making ice from water. If the water at $20 ℃$ is to be converted into $2 kg$ ice at $0 ℃$ , how many grams of ammonia is to be evaporated?(Given: The latent heat of vaporization of ammonia $= 341 cal / g$ , The specific latent heat of fusion of water $= 80 \frac{cal}{g}$ , The specific heat capacity of water $= 1 \frac{cal}{g ℃}$ )

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Important Questions on Heat

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Science>Physics>Heat>Specific Heat Capacity

The specific heat capacity of a substance

A

3, 800 J {kg}^{- 1} K^{- 1}

and that of a substance

B

400 J {kg}^{- 1} K^{- 1}

. Which of the two substances is a good conductor of heat? Give a reason for your answer.

EASY

Science>Physics>Heat>Specific Heat Capacity

State whether the specific heat capacity of a substance remains the same when its state changes from solid to liquid? Give one example to support your answer.

HARD

Science>Physics>Heat>Specific Heat Capacity

How much heat energy is necessary to raise the temperature of $5 kg$ of water from $20 ° C$ to $100 ° C$ ?

EASY

Science>Physics>Heat>Specific Heat Capacity

Let heat is not lost by any other process between two objects in thermal contact, "Net heat lost (by hot body) $=$ Net heat gain (by cold body)."

Above statement indicates a principle. Write the name of that principle.

EASY

Science>Physics>Heat>Specific Heat Capacity

A Kelvin thermometer and a Fahrenheit thermometer both give the same reading for a certain sample. What would be the corresponding reading in a Celsius thermometer?

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Science>Physics>Heat>Specific Heat Capacity

On what factors do the amount of heat required to raise the temperature of an object up to some fixed temperature depend?

EASY

Science>Physics>Heat>Specific Heat Capacity

What would be the final temperature of a mixture of

50 g

of water at

20 ° C

temperature and

50 g

of water at

40 ° C

temperature?

HARD

Science>Physics>Heat>Specific Heat Capacity

A calorimeter has mass

100 g

and specific heat

0.1 kcal / kg ℃

. It contains

250 gm

of liquid at

30 ℃

having a specific heat of

0.4 kcal / kg ℃

. If we drop a piece of ice of mass

10 g

0 ℃

, What will be the temperature of the mixture? (Take Specific latent heat of fusion of ice as

80 \frac{cal}{g}

)

HARD

Science>Physics>Heat>Specific Heat Capacity

Heating effect per second of current t flowing through a conductor of resistance R when a voltage V is applied across it for 1 second is:

EASY

Science>Physics>Heat>Specific Heat Capacity

What temperature is the same on the Celsius scale as well as on the Fahrenheit scale?

EASY

Science>Physics>Heat>Specific Heat Capacity

Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will:

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Science>Physics>Heat>Specific Heat Capacity

On what factors does the heat required by an object to increase its temperature depends?

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Science>Physics>Heat>Specific Heat Capacity

At what temperature (in degree celsius), the numerical values on Celsius and Fahrenheit scales become equal?

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Science>Physics>Heat>Specific Heat Capacity

How to determine the specific heat of liquid by using the method of mixtures?

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Science>Physics>Heat>Specific Heat Capacity

In the following problem, there is one question and three statements I, II and III given below the question. You have to decide whether the data given in the statements is sufficient to answer the question. Read all the statements carefully and find out which of the given statements is/are sufficient to answer the given question. Choose the correct alternative.

In which year was Amit born?
Statements:
I. Amit is six years older than Mahesh.
II. Mahesh's brother was born in 1982.
II. Amit's brother is 8 years younger than Mahesh's brother who is nine years younger than Mahesh.

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Science>Physics>Heat>Specific Heat Capacity