CBSE Class 10 Science Optional Questions with Answers

CBSE Class 10 Science Multiple Choice Questions(MCQs) & Answers CBSE Class 10 Science QUESTIONS

CBSE Class 10 Science Optional Questions with Answers

41 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
42 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
43 Which of the following alloys contains a non-metal as one of its constituents?
A Bronze
B Brass
C Steel
D Amalgam

Answer: Steel
44 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
45 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
46 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
47 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
48 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
49 The enzymes pepsin and trypsin are secreted respectively by
A Liver and salivary gland
B Stomach and pancreas
C Salivary gland and stomach
D Liver and pancreas

Answer: Stomach and pancreas
50 Electrical impulse travels in a neuron from:
A Dendrite → cell body → axon → axon end
B Axon end →axon → cell body → dendrite
C Dendrite → axon → axon end → cell body
D Cell body → dendrite → axon → axon end

Answer: Dendrite → cell body → axon → axon end

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