Subject Experts Solutions for Chapter: Heat, Exercise 1: PRACTICE QUESTIONS (CLASSROOM WING)

The heating\ curve of a particular substance in solid state is as shown in the figure. Choose the correct alternative.

If mass of the substance is $20 \mathrm{g}$, then the heat energy required to melt 1 g of the substance is _____ $\mathrm{J}$.

The heating\ curve of a particular substance in solid state is as shown in the figure. Choose the correct alternative.

The change of state in the graph is represented by _____ part.

Arrange the following steps in a sequential order to explain the formation of convectional currents through ventilation.
(A) The cold air enters into the room through windows from high pressure to low pressure region.
(B) Hot air in the room is less denser and it raises up.
(C) The rooms are provided with ventilators at the top.
(D) Hot air passes out through the ventilators it creates low pressure region in the rooms.

Arrange the following steps in sequential order to construct a celsius thermometer.
(A) Lower fixing point is marked by placing the bulb of the thermometer in pure melting ice.
(B) A thin capillary tube, covered with a thick glass stem and providing a funnel is taken.
(C) The distance between upper fixing point and lower fixing point is divided into 100 equal parts and calibrated.
(D) Upper fixing point is marked by placing the bulb of the thermometer in boiling water.. Arrange the following steps in sequential order to construct a celsius thermometer. of the thermometer in boiling water.
(E) While pouring the mercury in the tube, place the mercury bulb in hot water bath to remove air bubbles.
(F) Cut the funnel and seal that end.

The base of the cooking vessels is coated with _____ to absorb more heat. 

Which of the following statements is incorrect?

Which of the following colours is good reflector of heat?

When one takes a hot shower Fog is formed on the bathroom mirror but this does not happen during a cold shower because