Samacheer Kalvi Class 9 Science Matter Around Us Questions - 1

Question: 1

In a typical pressure cooker, the boiling point of water is

(A) Equal to 100°C

(B) Lesser than 100°C

(C) Greater than 100°C

(D) Much less than 100°C

Ans: C

Greater than 100°C

Question: 2

In the following options which is/are not considered as matter?

(A) Stones

(B) Force

(C) Sunlight

(D) Both b and c

Ans: D

Both b and c

Question: 3

In which separation method, a substance changes directly solid to gaseous state when heated?

(A) Chromatogrphy

(B) Centrifugation

(C) Distillation

(D) Sublimation

Ans: D


Question: 4

_____ is the smallest unit of pure substance, which always exists independently.

(A) Atom

(B) Element

(C) Compound

(D) Molecules

Ans: D


Question: 5

Compounds of _____ are used in toothpastes as they strengthen the teeth.

(A) Fluorine

(B) Phosphorous

(C) Common salt

(D) All the above

Ans: A


Question: 6

Name the instrument which is used in cream separators ad in removing fat from milk to produce skimmed milk

(A) Ultra-filter

(B) Washing machine

(C) Centripetal machine

(D) Centrifuge machine

Ans: D

Centrifuge machine

Question: 7

Brownian movement is named after

(A) John Brown

(B) Richard Brown

(C) Richard Feynman

(D) Robert Brown

Ans: D

Robert Brown

Question: 8

The particles of a substance is concentrated only at the surface of another substance is

(A) Adsorption

(B) Absorption

(C) Centrifugation

(D) Extraction

Ans: A


Question: 9

Which one is the example of elements?

(A) Copper

(B) Sugar

(C) Sodium chloride

(D) Water

Ans: A


Question: 10

The mixture of iron fillings and salt in heterogenous, while the salt solution is

(A) Homogeneous

(B) Trigenous

(C) Bigeneous

(D) Monogeneous

Ans: A