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Free download in PDF CBSE Class 10 Science Multiple Choice Questions(MCQs) & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE Class 10 Students.
1
The non-metal which is liquid at room temperature is:
A
Bromine
B
Helium
C
Mercury
D
Carbon
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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
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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:
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4
Bauxite is an ore of
A
Iron
B
Aluminium
C
Mercury
D
Copper
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5
The metal which is liquid at room temperature is
A
Mercury
B
Potassium
C
Bromine
D
Iodine
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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
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7
In electrolytic refining, the cathode is made up of
A
Metallic salt
B
Pure metal
C
Impure metal
D
None of these
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8
In the given reaction, Al2O3 + NaOH → ……X…… + H2O What is element X?
A
NaAlO2
B
NaAl2O3
C
Na3Al
D
Na2O3
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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
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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
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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
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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
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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
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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
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15
Which of the following alloys contains a non-metal as one of its constituents?
A
Bronze
B
Brass
C
Steel
D
Amalgam
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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:
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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
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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
View Answer
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
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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
View Answer
Answer: Exothermic process
