CBSE class 10 Science Quiz | CBSE Class 10 Science Multiple Choice Questions(MCQs) & Answers

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Questions
1 The non-metal which is liquid at room temperature is:
A Bromine
B Helium
C Mercury
D Carbon

Answer: Bromine
2 Ester is formed by the reaction between:
A An acid and an alcohol
B An acid and an alkene
C An acid and a base
D A base and an alcohol

Answer: An acid and an alcohol
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3 The number of protons in an atom of an element A is 19 then, the number of electron in its ion A+ is:
A 21
B 19
C 18
D 20

Answer: 18
4 Bauxite is an ore of
A Iron
B Aluminium
C Mercury
D Copper

Answer: Aluminium
5 The metal which is liquid at room temperature is
A Mercury
B Potassium
C Bromine
D Iodine

Answer: Mercury
6 The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as
A Refining
B Roasting
C Smelting
D Calcination

Answer: Roasting
7 In electrolytic refining, the cathode is made up of
A Metallic salt
B Pure metal
C Impure metal
D None of these

Answer: Pure metal
8 In the given reaction, Al2O3 + NaOH → ……X…… + H2O What is element X?
A NaAlO2
B NaAl2O3
C Na3Al
D Na2O3

Answer: NaAlO2
9 Which of the following represent the correct order of decreasing reactivity?
A Mg > Al > Zn > Fe
B Mg > Fe > Zn > Al
C Mg > Zn > Al > Fe
D Al > Zn > Fe > Mg

Answer: Mg > Al > Zn > Fe
10 An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
A Fe
B Ca
C C
D None of these

Answer: Ca
11 Which of the following pairs will give displacement reactions?
A AgNO3 solution and copper metal
B FeSO4 solution and silver metal
C NaCl solution and copper metal
D MgCl2 solution and aluminium metal

Answer: AgNO3 solution and copper metal
12 Which among the following is the most abundant metal found in the earth’s crust?
A Aluminium
B Iron
C Magnesium
D Oxygen

Answer: Aluminium
13 Which of the following pairs of reactants will go undergo a displacement reaction?
A Ca(SO4)2 + Fe
B CuSO4 + Fe
C ZnSO4 + Fe
D MgSO4 + Fe

Answer: CuSO4 + Fe
14 Galvanisation is a method of protecting steel and iron from rusting by coating them with a thin layer of
A Zinc
B Bauxite
C Copper
D Aluminum

Answer: Zinc
15 Which of the following alloys contains a non-metal as one of its constituents?
A Bronze
B Brass
C Steel
D Amalgam

Answer: Steel
16 An element X is soft and can be cut with the help of a knife. It is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following:
A Na
B Ca
C Mg
D P

Answer: Na
17 Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of:
A Citric acid
B Lactic acid
C Acetic acid
D Oxalic acid

Answer: Citric acid
18 Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:
A Remove the layer of magnesium carbonate from the ribbon surface
B Remove the moisture from the ribbon surface
C Make the ribbon surface shinier
D Remove the layer of magnesium oxide from the ribbon surface

Answer: Remove the layer of magnesium carbonate from the ribbon surface
19 In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:
A Barium sulphate
B Sulphur
C Hydrochloric acid
D Chlorine

Answer: Barium sulphate
20 The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:
A Physical process
B Endothermic process
C Exothermic process
D Reversible process

Answer: Exothermic process

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