Temperature is a measure of the average kinetic energy of the particles in a system. Temperature is a physical quantity that expresses the degree of hotness or coldness of a substance. When heat is given to a substance will increase its temperature and when heat is removed from a body, the temperature reduces. The SI unit of temperature is kelvin.

EASY

Earn 100

What is heat energy, and what are its effects?

Important Questions on Heat and Temperature

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

A horizontal fire hose with a nozzle of cross-sectional area $\frac{5}{\sqrt{21}} \times 10^{- 3} m^{2}$ delivers a cubic metre of water in $10 s .$ What will be the maximum possible increase in the temperature of water while it hits a rigid wall (neglecting the effect of gravity)?

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

104 g

of water at

30 ° C

is taken in a calorimeter made of copper of mass

42 g

. When a certain mass of ice at

0 ° C

is added to it, the final steady temperature of the mixture after the ice has melted, was found to be

10 ° C

. Find the mass of ice added. (Specific heat capacity of water =

4.2 J g^{- 1} ° C^{- 1}

, Specific latent heat of fusion of ice =

336 J g^{- 1}

, Specific heat capacity of copper =

0.4 J g^{- 1} ° C^{- 1}

)

HARD

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

A current carrying wire heats a metal rod. The wire provides a constant power

(P)

to the rod. The metal rod is enclosed in an insulated container. It is observed that the temperature

(T)

in the metal rod changes with time

(t)

as:

T (t) = T_{0} (1 + β t^{\frac{1}{4}})

, where

β

is a constant with appropriate dimension while

T_{0}

is a constant with dimension of temperature. The heat capacity of the metal is:

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

The process in which solid changes to gas:

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

To save milk from going stale we boil it many times or keep it in the refrigerator. Why?

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

Why we leave some space between two rail tracks while joining it.

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

If you apply some heat energy to a substance, which of the following can take place in it?

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

Name the process through which a solid changes to a gas.

(Choose from: Condensation/Sublimation)

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

If you apply heat energy, the temperature of a system will _____(decrease/ increase/ remain same).

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

Define temperature.

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

While sweating, contact with air makes us feel cool. Why?

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

During summers, water in a pitcher made up of smooth black soil does not become as cool as in the pitcher made of red soil. Why?

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

Non conductor of heat is -

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

Give few examples of effects of heat seen in our daily life.

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

What are the effects of heat?

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

On heating a body, its temperature _____(decreases/ increases).

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

The growth of a mammal cell needs a temperature of _____

{}^{\circ}C

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

In summers to keep the water cool, we keep it in pitchers made up of red soil and not in metal pitchers. Why?

MEDIUM

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

Explain expansion of gases through an activity?

EASY

Science>Physics>Heat and Temperature>Effects of Heat: Increase in Temperature

Choose the right word from the following:
(heat, solute, condensation, melting, freezing, solution, sedimentation, soluble)
When we _____ the matter, the molecules present in it start moving faster.

What is heat energy, and what are its effects?

Important Questions on Heat and Temperature

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