Glass — Homi Bhabha Class 9 Chemistry MCQs with Solutions
Free Homi Bhabha Class 9 Chemistry Glass MCQs with step-by-step solutions (8 questions). Part of Substances in Daily Use & Applied Chemistry. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Glass · medium · theory
The main raw material used to make ordinary glass is:
A. gypsum
B. limestone only
C. clay
D. sand (silica) ✓ Correct
Solution: Glass is made mainly from silica (sand), together with soda and limestone.
Q2 — Glass · hard · theory
Glass is best described as a(n):
A. liquid
B. amorphous solid ✓ Correct
C. crystalline solid
D. gas
Solution: Glass lacks a regular crystal structure, so it is an amorphous (non-crystalline) solid.
Q3 — Glass · medium · theory
Which property makes glass suitable for windows?
A. It is magnetic
B. It is flexible
C. It is transparent ✓ Correct
D. It is a good conductor of electricity
Solution: Glass is transparent, allowing light to pass through, which is ideal for windows.
Q4 — Glass · medium · theory
A useful environmental advantage of glass is that it is:
A. biodegradable within days
B. a good fuel
C. recyclable ✓ Correct
D. radioactive
Solution: Glass can be melted and re-used repeatedly, so it is recyclable.
Q5 — Glass · hard · theory
Toughened (safety) glass used in car windows is designed to:
A. break into small blunt pieces instead of sharp shards ✓ Correct
B. bend like rubber
C. conduct electricity
D. never break
Solution: Safety glass crumbles into small, relatively harmless granules, reducing injury.
Q6 — Glass · easy · theory
The chief raw material used in making ordinary glass is
A. common salt
B. washing soda alone
C. graphite
D. sand (silica) ✓ Correct
Solution: Ordinary glass is made mainly from sand, which is silica (SiO2), melted together with soda (sodium carbonate) and limestone (calcium carbonate) at a high temperature.
Q7 — Glass · medium · theory
Which statement about glass is correct?
A. Glass is a pure chemical element
B. Glass is a crystalline solid that melts at a single sharp temperature
C. Glass is an amorphous solid that softens gradually over a range of temperatures ✓ Correct
D. Glass is a very good conductor of electricity
Solution: The particles in glass have no regular repeating arrangement, so glass is an amorphous solid (often called a supercooled liquid). It has no sharp melting point and instead softens over a range of temperatures.
Q8 — Glass · hard · theory
Laboratory beakers and ovenware are made from borosilicate (Pyrex-type) glass rather than ordinary glass because borosilicate glass
A. dissolves slowly and safely in hot water
B. is an excellent conductor of heat and electricity
C. melts at a much lower temperature than ordinary glass
D. expands very little on heating and so resists cracking when the temperature changes suddenly ✓ Correct
Solution: Adding boron oxide gives borosilicate glass a very low thermal expansion. It barely expands or contracts when heated or cooled quickly, so it does not crack under sudden temperature change, making it suitable for laboratory and oven use.