CBSE Class 10 Science - Practice Test
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CBSE Class 10 Science

CBSE Class 10 Science - Practice Test

Comprehensive mock test covering Light, Electricity, and Natural Resource Management. Includes numerical problems, practical applications, and environmental concepts.

2025-07-15
Pavan Pavan
CBSE Class 10 Science Grade 10

Duration

20 min

Questions

18

Marking

Negative

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Questions Preview

Which of the following is not a physical change?

A
Boiling of water to give water vapour
B
Melting of ice to give water
C
Dissolution of salt in water
D
Combustion of Liquefied Petroleum Gas (LPG)

The following reaction is an example of a 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

A
displacement reaction and neutralisation reaction
B
combination reaction and redox reaction
C
displacement reaction and redox reaction
D
redox reaction and neutralisation reaction

Which of the following statements about the given reaction are correct? 3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)

A
Iron metal is getting oxidised, Water is getting reduced, Water is acting as reducing agent
B
Water is acting as reducing agent, Water is acting as oxidising agent
C
Iron metal is getting oxidised, Water is getting reduced, Water is acting as oxidising agent
D
Water is getting reduced, Water is acting as oxidising agent

Which of the following are exothermic processes?

A
Reaction of water with quick lime and Dilution of an acid
B
Dilution of an acid and Evaporation of water
C
Reaction of water with quick lime and Sublimation of camphor crystals
D
Evaporation of water and Sublimation of camphor crystals

Three beakers A, B and C each containing 25 mL of water were taken. NaOH, anhydrous CuSO₄ and NaCl were added to beakers A, B and C respectively. Temperature increased in A and B, but decreased in C. Which statement(s) is(are) correct?

A
In beakers A and B, exothermic process has occurred only
B
In beakers A and B, endothermic process has occurred only
C
In beakers A and B, exothermic process has occurred and In beaker C endothermic process has occurred
D
In beakers A and B, endothermic process has occurred and In beaker C exothermic process has occurred

A dilute ferrous sulphate solution was gradually added to acidified permanganate solution. The light purple colour fades and disappears. What is the correct explanation?

A
KMnO₄ is an oxidising agent, it oxidises FeSO₄
B
FeSO₄ acts as an oxidising agent and oxidises KMnO₄
C
The colour disappears due to dilution; no reaction is involved
D
KMnO₄ is unstable and decomposes in presence of FeSO₄ to a colourless compound

Which among the following is(are) double displacement reaction(s)?

A
Pb + CuCl₂ → PbCl₂ + Cu and CH₄ + 2O₂ → CO₂ + 2H₂O
B
Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl only
C
Pb + CuCl₂ → PbCl₂ + Cu and Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
D
C + O₂ → CO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O

Exposure of silver chloride to sunlight for a long duration turns grey due to:

A
the formation of silver by decomposition of silver chloride only
B
the formation of silver by decomposition and decomposition of chlorine gas from silver chloride
C
sublimation of silver chloride and decomposition of chlorine gas from silver chloride
D
oxidation of silver chloride only

Slaking of lime involves solid calcium oxide reacting with water to form calcium hydroxide with heat liberation. Which statements are true about this process?

A
It is an endothermic reaction and exothermic reaction
B
It is an exothermic reaction and pH of resulting solution will be more than seven
C
It is an endothermic reaction and pH of resulting solution will be less than seven
D
pH of resulting solution will be more than seven and less than seven

Barium chloride reacting with ammonium sulphate forms barium sulphate and ammonium chloride. This reaction is:

A
Displacement reaction only
B
Precipitation reaction only
C
Double displacement reaction only
D
Precipitation reaction and Double displacement reaction

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated is:

A
1:1
B
2:1
C
4:1
D
1:2

Which of the following is(are) an endothermic process(es)?

A
Dilution of sulphuric acid and Condensation of water vapours
B
Sublimation of dry ice only
C
Condensation of water vapours only
D
Sublimation of dry ice and Evaporation of water

In double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, yellow lead iodide precipitate forms. If lead nitrate is not available, which can be used instead?

A
Lead sulphate (insoluble)
B
Lead acetate
C
Ammonium nitrate
D
Potassium sulphate

Which gases can be used for storage of fresh oil sample for a long time?

A
Carbon dioxide or oxygen
B
Nitrogen or oxygen
C
Carbon dioxide or helium
D
Helium or nitrogen

The reaction 2KClO₃(s) → 2KCl(s) + 3O₂(g) is used for oxygen preparation in laboratory. Which statement is correct?

A
It is a decomposition reaction and endothermic in nature
B
It is a combination reaction
C
It is a decomposition reaction and accompanied by release of heat
D
It is a photochemical decomposition reaction and exothermic in nature

Which process involves chemical reactions?

A
Storing of oxygen gas under pressure in a gas cylinder
B
Liquefaction of air
C
Keeping petrol in a china dish in the open
D
Heating copper wire in presence of air at high temperature

In which chemical equation do the abbreviations represent the correct states of reactants and products at reaction temperature?

A
2H₂(l) + O₂(l) → 2H₂O(g)
B
2H₂(g) + O₂(l) → 2H₂O(l)
C
2H₂(g) + O₂(g) → 2H₂O(l)
D
2H₂(g) + O₂(g) → 2H₂O(g)

Which of the following are combination reactions?

A
2KClO₃ → 2KCl + 3O₂ and 4Al + 3O₂ → 2Al₂O₃
B
4Al + 3O₂ → 2Al₂O₃ and Zn + FeSO₄ → ZnSO₄ + Fe
C
MgO + H₂O → Mg(OH)₂ and Zn + FeSO₄ → ZnSO₄ + Fe
D
MgO + H₂O → Mg(OH)₂ and 4Al + 3O₂ → 2Al₂O₃