Class 9 Science ch2 MCQ. We covered all the Class 9 Science ch2 MCQ in this post for free so that you can practice well for the exam.
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MCQ on General Science for Class 9 Students
Which of the following is/are not correctly matched? (I) Absolute alcohol – 100% ethanol (II) Power alcohol – 90-95% ethanol (III) Rectified spirit – 5% ethanol
(a) I only
(b) II only
(c) III only
(d) II and III
Option d – II and III
In a sample of ethyl ethanoate (CH₂COOC₂H₂) the two oxygen atoms have the same number of electrons but of different numbers neutrons. Which of the following is the correct reason for it?
(a) One of the oxygen atoms has gained electrons
(b) One of the oxygen atoms has gained two neutrons
(c) The two oxygen atoms are isotopes
(d) The two oxygen atoms are isobars.
Option c – The two oxygen atoms are isotopes
Which one of the following pairs is not correctly matched?
(a) Dry ice: Solid carbon dioxide
(b) Mustard gas: Poisonous liquid used in chemical warfare
(c) Teflon: Polymer containing fluorine
(d) Fullerene: Organic compounds containing fluorine
Option d – Fullerene: Organic compounds containing fluorine
The following statements are made in connection with carbon dioxide (CO₂) 1. CO2 is a poisonous gas. 2. CO₂ is an acidic oxide. 3. CO₂ turns limewater milky. Which of the statements given above is/are correct?
(a) 1 and 2
(b) 2 and 3
(c) 3 only
(d) 1 and 3
Option b – 2 and 3
Which is the main component of natural gas?
(a) Methane
(b) Ethane
(c) Propane
(d) Benzene
(e) None of the above
Option a – Methane
Water gas is
(a) CO + H₂
(b) CO + H₂O
(c) CO₂ + H₂
(d) CO₂ + H₂O
(e) None of the above
Option a – CO + H₂
Methyl Isocyanate gas, which was involved in the disaster in Bhopal in December 1984, was used in the Union Carbide factory for the production of
(a) Dyes
(b) Detergents
(c) Explosives
(d) Pesticides
Option d – Pesticides
Which one of the following statements is not correct?
(a) Water starts boiling when its vapour pressure becomes equal to atmospheric pressure.
(b) Water is known as the universal solvent.
(c) The permanent hardness of water is due to the presence of MgCl₂, CaCl2, MgSO4 and CaSO4.
(d) The density of ice is greater than that of water.
Option d – The density of ice is greater than that of water
‘Freon’ used as refrigerants is chemically known as
(a) chlorinated hydrocarbon
(b) fluorinated hydrocarbon
(c) chlorofluoro hydrocarbon
(d) fluorinated aromatic compound
Option c – chlorofluoro hydrocarbon
Which one of the following is used as a mordant in the dyeing and tanning industry?
(a) Magnesium oxide
(b) Magnesium carbonate
(c) Magnesium chloride
(d) Magnesium sulphate
Option d – Magnesium sulphate
With the rise in temperature, the viscosity of the liquid
(a) Increases
(b) Decreases
(c) Remains unchanged
(d) May increase or decrease depending on the nature of liquid
Option b – Decreases
Which of the following is not a property of a crystalline solid?
(a) The atoms and molecules are arranged in a definite order
(b) It does not have a sharp melting point
(c) Crystalline solids are bounded by flat surfaces
(d) They possess uniform chemical composition
Option b – It does not have a sharp melting point
The gas used in the manufacture of Vanaspati Ghee from Vanasapati Oil is
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide
(e) None of the above / More than one of the above
Option a – Hydrogen
Hydrogen gas can be conveniently used as fuel for running vehicles if it is absorbed at a very low temperature by a substance only to be released at the temperature generated by the exhaust. What is that substance found in India?
(a) Hydrites
(b) Coals
(c) Soapstone
(d) Resins
Option d – Resins
Which one of the following forms an irreversible complex with haemoglobin in the blood?
(a) Carbon dioxide
(b) Pure Nitrogen gas
(c) Carbon monoxide
(d) a mixture of carbon dioxide and helium
Option c – Carbon monoxide
The hypo solution used in photography is the aqueous solution of
(a) sodium thiosulphate
(b) sodium tetrathionate
(c) sodium sulphate
(d) ammonium per sulphate
Option a – sodium thiosulphate
Which one of the following compounds is used as a sedative?
(a) Potassium bromide
(b) Calcium chloride
(c) Ethyl alcohol
(d) Phosphorus trichloride
Option a – Potassium bromide
Indane gas is a mixture of
(a) butane and hydrogen
(b) butane and oxygen
(c) butane and propane
(d) methane and oxygen
Option c – butane and propane
Which one of the following is not an explosive matter?
(a) Trinitro toluene
(b) Dinitro glycerine
(c) Cyclo Trimethylene trinitramine
(d) Nitrochloroform
Option d – Nitrochloroform
Which of the following statements is correct?
(a) Most of the food preparations are colloidal in nature
(b) Most drugs, which are insoluble in water, are administered as colloidal dispersions
(c) Latex is a colloidal solution of negatively charged. colloidal rubber particles
(d) All of the above
Option d – All of the above
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