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What is the constant temperature at which solid changes to its liquid state?

Explain physical and chemical changes with examples. [5 MARKS]

Which of the following crops would you grow on sandy loams?

The process of removing cotton seeds from cotton pods is known as _______.

You are handed a mixture of sand and salt. How do you separate the two substances? Anything added to the mixture has to be retrieved. [5 MARKS]

In an experiment, a lighter is brought in contact with a funnel contaning a gas. The lighter burns with a bright flame. Presence of which gas is confirmed in this experiment?

In knitting ________ set(s) of yarn is used to make a piece of fabric whereas in weaving ______ set(s) of yarn are arranged together to make a fabric.

Match the entries of column I with column II

Matter changes from one state to another with change in:

The substance that undergoes chemical change is known as:

Question 20

Match the objects given in Column I with the materials given in Column II.

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{(a)}& \text{Surgical instruments}& \text{(i)}& \text{Plastic}\\ \text{(b)}& \text{Newspaper}& (\text{ii)}& \text{Animal product}\\ \text{(c)}& \text{Electrical switches}& \text{(iii)}& \text{Steel}\\ \text{(d)}& \text{Wool}& \text{(iv)}& \text{Plant product}\end{array}$

Arrange the following options into correct pairs and accordingly choose the correct option:

i. Sandy soil a. Mixture of large and small soil particles along with silt

ii. Clayey soil b. Large soil particles, lots of air spaces

iii. Loamy soil c. Small soil particles, pack tightly together

Statement I: Air is a mixture of gases, water vapour and dust particles.

Statement II: Air is composed of only one gas that is nitrogen.

Statement III: Air is composed of two gases, nitrogen and oxygen only.

Which of the above statement is incorrect?

Study the table given below.
$\begin{array}{ccc}\text{Mixture}& \text{Wanted}& \text{Unwanted}\\ & \text{component}& \text{component}\\ \text{1. Wheat flour}& \text{Flour}& \text{X}\\ \text{2. Y}& \text{Grain seeds}& \text{Stalks}\end{array}$
Based on the above information, identify $X$ and $Y$.

Which of the following observations help us to determine whether a chemical reaction has taken place or not?

(i) Change in state.

(ii) Change in colour.

(iii) Change in shape

(iv) Evolution of gas.

(v) Change in temperature.

Separating stones from pulses solve this purpose:

Which among the following are man-made sources of air pollution?
a. Burning of fire wood and dung cakes
​b. Forest fires
c. Factories
d. Power plants
e. Volcanoes
f. Automobiles

Question 20

Match articles given in column I with the articles of Column II.

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{(a) Sweater}& \text{(i) Cotton}\\ \text{(b) Cotton bolls}& \text{(ii) Wool}\\ \text{(c)Dhoti}& \text{iii)Ginning}\\ \text{(d)Gunny bags}& \text{(iv)Jute}\end{array}$

Cotton is obtained from cotton pods by:

What would be atomicity of $N{H}_4^{+}$ and $C{l}^{-}$ in ammonium chloride?

Which of the following gas is used to prepare fizzy drinks like soda water?

Which of the following are the main processes of making fabric from yarn?

Which of the following enables us to drink a liquid through a straw?

Question 7

The components of air which are harmful to living beings are :

a) Nitrogen.

b) Water vapour.

c) Dust and smoke.

d) Carbon dioxide.

Silverware becomes black when exposed to air but regains its lustre on polishing. This is because:

Refrigerators and air conditioners release which of the following gas?

Question 10

Find the odd one out from the following.

(a) Tawa

(b) Spade

(c) Pressure cooker

(d) Eraser

Observe the Venn diagram given below.

Which of the following process could be "X"?

Note:- X possess the properties of both the changes.

A mixture contains three different particles X, Y and Z. Characteristics of X, Y and Z are given below:
$$\begin{array}{ccc}\text{X}& \text{Y}& \text{Z}\\ \text{Very heavy particles}& \text{Heavy particles}& \text{Very light particles}\\ \text{Non-magnetic}& \text{Magnetic}& \text{Non-magnetic}\end{array}$$ Which among the combination of methods should be used in order to obtain particles X from the given mixture?

In Change carts, the iron rim is usually heated before fixing to the wooden wheels, because on heating, the iron:-

Question 9

During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school. The bottle still had some water left in it. The following day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to

(a) Boiling and condensation.

(b) Evaporation and saturation.

(c) Evaporation and condensation.

(d) Condensation and saturation.

Which method is used to separate the flour mixed with bran and husk?

What is the need for churning out butter from milk?

Question 8 (b)

Fill up the blanks
When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ___

There are 2 containers of the same height and the same base radius. One is a right circular cone and the other is a cylinder. The cone is completely filled with milk and the cylinder is completely filled with water.

The contents from both the containers are emptied into a third vessel. What is the ratio of milk to water in the third container?

Pick out the pair of species having identical shapes for both the molecules.

What is drought? When does it occur? [3 MARKS]

Which of the following mixtures can be separated by sedimentation process?

Explain properties of matter with examples .