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

(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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