Cement mixed with aggregates (sand, gravel) and water forms:
A. Asphalt
B. Plaster
C. Mortar
D. Concrete
Answer: Option D
Solution (By JKSSB Mock Tests)
Concrete is a mixture of cement, fine aggregate (sand), coarse aggregate (gravel/crushed stone), and water. Mortar is cement + sand + water (no coarse aggregate). Plaster is cement/sand with water for coating walls. Asphalt is bitumen + aggregate. Concrete is strong in compression, used in buildings, bridges.
Explanation:
Graphite's carbon atoms are arranged in layers held together by weak van der Waals forces. Layers can slide over each other, reducing friction. It is stable at high temperatures, so used where oil would decompose.
Explanation:
Washing soda is sodium carbonate decahydrate, with the chemical formula Na₂CO₃·10H₂O. Sodium bicarbonate is baking soda (NaHCO₃). Sodium hydroxide is caustic soda (NaOH), and sodium chloride is common table salt (NaCl). Washing soda is used for cleaning and water softening.
Explanation:
Plaster of Paris is prepared by heating gypsum (CaSO₄·2H₂O) at 373 K, removing part of water of crystallization to form CaSO₄·½H₂O. CaCO₃ is limestone.
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