Q 1. The most abundant element in the Earth’s crust is:
A) Silicon
B) Aluminium
C) Oxygen
D) Iron
Answer: C) Oxygen
Q 2. Plaster of Paris is made from:
A) Limestone
B) Gypsum
C) Chalk
D) Quicklime
Answer: B) Gypsum
Q 3. __________ metal melts on our palm.
A) Iron
B) Copper
C) Gallium
D) Aluminium
Answer: C) Gallium
Q 4. Which one of the following elements is least reactive with water?
A) Sodium
B) Calcium
C) Magnesium
D) Gold
Answer: D) Gold
Q 5. The most abundant element in the Earth’s crust by weight is:
A) Silicon
B) Aluminium
C) Oxygen
D) Iron
Answer: C) Oxygen
Q 6. The main constituents of bronze are:
A) Copper and Zinc
B) Copper and Tin
C) Iron and Carbon
D) Aluminium and Copper
Answer: B) Copper and Tin
Q 7. Silver metal is obtained by:
A) Froth flotation process
B) Parke’s process
C) Magnetic separation
D) Calcination
Answer: B) Parke’s process
Q 8. The process of sudden cooling is known as:
A) Annealing
B) Tempering
C) Quenching
D) Smelting
Answer: C) Quenching
Q 9. Silver is present in:
A) Bauxite
B) Argentite
C) Hematite
D) Chalcopyrite
Answer: B) Argentite
Q 10. Duralumin is an alloy of:
A) Copper and Zinc
B) Aluminium, Copper, Magnesium, and Manganese
C) Iron and Carbon
D) Nickel and Chromium
Answer: B) Aluminium, Copper, Magnesium, and Manganese