The SI unit of calorific value is: MCQ with Answer and Explanation

The SI unit of calorific value is:
A. Kilocalorie per gram
B. Pascal
C. Joule per kilogram
D. Watt
Answer: Option C
Solution (By JKSSB Mock Tests)
Calorific value is the amount of heat energy produced by complete combustion of unit mass of a fuel. SI unit is J/kg, often expressed as kJ/kg or MJ/kg. Previously, kcal/kg or cal/g was used. 1 cal = 4.184 J. Higher calorific value indicates better fuel. Example: hydrogen has very high calorific value ~150 MJ/kg. Exam note: Calorific value is measured by bomb calorimeter.

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Question #1
Which type of glass is used for making laboratory glassware and cookware due to its high thermal resistance?
A. Borosilicate glass
B. Lead crystal glass
C. Quartz glass
D. Soda-lime glass

Correct Answer: Option A


Explanation:
Borosilicate glass (e.g., Pyrex) contains boron trioxide (B₂O₃) along with silica, giving it low coefficient of thermal expansion, thus resistant to cracking under temperature changes. Soda-lime glass is ordinary glass, used for bottles, windows. Lead crystal has high refractive index for decorative items. Quartz glass (pure SiO₂) has very high melting point but is expensive. Borosilicate is ideal for beakers, test tubes.

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The Contact process is used for the manufacture of:
A. Nitric acid
B. Ammonia
C. Sulphuric acid
D. Sodium hydroxide

Correct Answer: Option C


Explanation:
Contact process: SO₂ + O₂ ⇌ SO₃ (catalyst V₂O₅) followed by absorption in H₂SO₄ to produce H₂S₂O₇, then H₂SO₄.

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Question #3
Who is credited with the discovery of the atomic nucleus through the gold foil experiment?
A. J. J. Thomson
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Correct Answer: Option C


Explanation:
Ernest Rutherford, in 1911, along with Geiger and Marsden, bombarded a thin gold foil with alpha particles. Most passed through, some were deflected at large angles, leading to the nuclear model of the atom—a small, dense, positively charged nucleus with electrons around it. Thomson's plum pudding model predicted no large deflections. Chadwick discovered neutron.

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