Heat & its Meas...

Why is the temperature range taken as 14.5^oC to 15.5^oC while defining the term calorie?

Which of the following is not correct for specific heat capacity of a substance?

Which of the following materials have specific heat capacity more than 4000 Jkg^-1K^-1?
(a)   Lead
(b)   Mercury
(c)   Water
(d)   Hydrogen
(e)   Ice

Which of the following statements are incorrect?

(a)Each substance is made of molecules.
(b)The molecules in a substance remain in a state of rest.
(c)Kinetic energy of molecules is known as heat energy.
(d) Molecules only come into motion when heat is supplied to them.

How do impurities affect the boiling point of a liquid?

Which of the following factors do not affect the quantity of heat required to raise the temperature of a body?

(a) Mass of the body
(b) Nature of the substance of the body
(c) Volume of the body
(d) Shape of the body
(e) Rise in the temperature of the body

What amount of heat energy is required to raise the temperature of 3 kg of water from 5^oC to 10^oC?

Which of the following are sublime substances?

(a) Ice
(b) Camphor
(c) Naphthalene
(d) Sulphur

What amount of boiling water at 100⁰C will be required to melt 3 kgs of ice so that the mixture is at 0⁰C?

Which of the following statements are correct for situation at high altitudes?

(a) The atmospheric pressure is very high.
(b) Water boils at a temperature more than 100^oC.
(c) The heat of boiled water does not provide the required energy for cooking food.
(d) It takes a much longer time to cook food.

Which of the following principles is taken into account for the construction of a calorimeter?

What mass of a liquid X having specific heat capacity 0.84 Jkg^-1K^-1 at a temperature 50^oC must be mixed with 50 grams of a liquid Y of specific heat capacity 2.1 Jg^-1K^-1 at 25^oC, so that the final temperature of the mixture becomes 42⁰C?

Which of the following materials is incorrectly matched with its latent heat of fusion?

A bucket of hot water of unknown temperature was added to twice its mass of cold water at 25⁰C. The final temperature of the mixture was found to be 35⁰C. What could have been the initial temperature of hot water?

How much heat energy is required to melt 2 kg of ice?