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CBSE Class 10 Science Worksheet

Unit I: Chemical Substances - Nature and Behaviour - Metals and Non Metals

1.
Fill in the blanks: Charge of the cathode in the electrolytic cell is _______.
A) Positive B) Negative C) Neutral D) None of these
2.
Fill in the blanks: Constituent of 22 carat gold is ______.
A) Copper B) Silver C) Iron D) Either 1 or 2
3.

Following are the types of Hardness

A)

Vickers Hardness Test

B)

Rockwell Hardness Test

C)

Brinell Hardness Test 

D)

All of the above

4.

Potassium is a soft metal as it can be cut easily with a knife

A) True B) False
5.
Which gas is evolved when a metal reacts with water?
A) Nitrogen B) Hydrogen C) Oxygen D) Carbon Dioxide
6.
Fill in the blanks: __________ is a non metal which is lustrous.
7.
Fill in the blanks: The most abundant metal in the Earth's crust is _________.
A) Iron B) Copper C) Platinum D) Aluminium
8.
Which of the following metal is refined by electrolytic refining?
A) Au B) Ag C) Cu D) K
9.
State TRUE/FALSE: Charge of the anode in the electrolytic cell is positive.
A) TRUE B) FALSE
10.
Which material are used as anode and cathode for refining of silver metal by the process of electrolysis?
11.

At normal temperature, the surfaces of metals like magnesium, zinc, aluminium etc are covered with a thin layer of oxide. This is to

A)

Prevent  further oxidation of the metals

B)

Prevent further reduction of the metals

C)

Help further oxidation of the metals

D)

Help further corrosion of the metals

12.
State TRUE/FALSE: Non-metallic oxides are always acidic.
A) TRUE B) FALSE
13.
Which compound is used with aluminium is used to join railway tracks?
14.
Which metal does not liberate hydrogen from acids but reacts with oxygen to give a black colour product?
A) Sodium B) Copper C) Calcium D) Aluminium
15.

A)

A, B

B)

B, C

C)

A, B, D

D)

A, C, D

16.

Hydrogen gas is evolved when a metal reacts with nitric acid

A) True B) False
17.

Metals are good conductors of heat and electricity

A) True B) False
18.
Fill in the blanks: Hydrogen gas is not evolved when a metal reacts with nitric acid because of ______.
A) Nitric acid is a strong reducing agent B) Nitric acid is a strong oxidising agent C) Nitric acid is a weak oxidising agent D) None of these
19.
Fill in the blanks: The electrolyte solution used for electrolytic refining of copper is __________.
A) Copper sulphate B) Copper oxide C) Iron sulphate D) Iron oxide
20.
Which metal reacts violently with cold water?
A) Potassium B) Aluminium C) Calcium D) Copper

CBSE Class 10 Science Worksheet

Unit I: Chemical Substances - Nature and Behaviour - Metals and Non Metals

Answers

1.
Option B
2.
Option D
3.
Option D
4.
Option A
5.
Option B

6.
Iodine
7.
Option D
8.
Option D
9.
Option A

10.
Impure silver and pure silver respectively.
11.
Option A
12.
Option B

13.
Fe2O3
14.
Option B
15.
Option B
16.
Option B
17.
Option A
18.
Option B
19.
Option A
20.
Option A

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