Question 1 :
While mixing sugar with water, the level of water does not increase because _____________.

Question 2 :
The water, when left uncovered, gets converted into vapor due to:

Question 4 :
Different kinds of matter show different properties due to the presence of :

Question 6 :
Choose the correct alternative from the choice given for the following statement:&#160;&#160;&#160;&#160;&#160; Burning is a<br/>

Question 9 :
When we make tea, coffee or lemonade, particles of one type of matter get into the spaces between particles of the other. Why?

Question 10 :
Three groups of materials are given below :I: Salt, sugar, flour<br/>II: Copper, gold, silver<br/>III: Petrol, kerosene, paper<br/>Identify the property common to each group.<br/>

Question 11 :
The&#160;process by which molecules undergo a spontaneous transition from the liquid&#160;phase to the gaseous phase is called as:<br/>

Question 15 :
State whether true or false :<br/>Sponge is also solid. Yet we are able to compress it.&#160; <br/>

Question 18 :
Statement: Mothballs and camphor are examples of vapourisation.State whether the given statement is true or false.

Question 19 :
The phenomenon of change of a liquid into the gaseous state at any&#160;temperature below its boiling point is called :<br/>

Question 21 :
Assertion: A desert cooler cools better on a hot dry day. Reason: On a hot dry day, the temperature is high and humidity is low. The water takes heat from the hot desert cooler and evaporates. The evaporation of water cools the pads and the circulating water.

Question 22 :
While putting clothes for drying up, why dowe spread them out?

Question 24 :
Evaporation of a liquid at room temperature leads to _________ on the liquid surface.<br/>

Question 27 :
Assertion: In a container containing gas A at temperature $ 400\,K $ , some more gas A at temperature $ 400\,K $ is introduced. The pressure of the system increases. Reason: Increase in gaseous particles increases the number of collisions among the molecules , hence the pressure increases .

Question 28 :
An amount of $1$ mole of a gas is changed from its initial state($20$L, $2$ atm) to final state($4$L, $10$ atm), respectively. If the change can be represented by a straight line in P-V curve, the maximum temperature achieved by the gas in the process is?($R=0.08$L-atm/K-mol)

Question 29 :
Two identical containers, each of volume $V_o$, are joined by a small pipe of negligible volume. The containers contain identical gases at temperature $T_o$ and pressure $P_o$. One container is heated to temperature $2T_o$ while maintaining the other at the same temperature, $T_o$. The common pressure of the gas is P and n is the number of moles of gas in container at temperature $2T_o$, then?

Question 30 :
Under what pressure will carbon dioxide have the density of $2.2$ g/litre at $300$K? For $CO_2$, $a=3.6$ atm $l^2 mol^{-2}$ and $b=0.05$ $l-mol^{-1}$.