1. When an iron nail gets rusted, iron oxide is formed
A. without any change in the weight of the nail
B. with decrease in the weight of the nail
C. with increase in the weight of the nail
D. without any change in colour or weight of the nail
Answer: Option C
2. Galvanised iron sheets have a coating of
A. lead
B. chromium
C. zinc
D. tin
Answer: Option C
3. Among the various allotropes of carbon,
A. coke is the hardest, graphite is the softest
B. diamond is the hardest, coke is the softest
C. diamond is the hardest, graphite is the softest
D. diamond is the hardest, lamp black is the softest
Answer: Option C
4. The group of metals Fe, Co, Ni may best called as
A. transition metals
B. main group metals
C. alkali metals
D. rare metals
Answer: Option A
5. Heavy water is
A. deuterium oxide
B. PH7
C. rain water
D. tritium oxide
Answer: Option A
6. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
A. bromine
B. fluorine
C. chlorine
D. sulphur
Answer: Option D
7. The element common to all acids is
A. hydrogen
B. carbon
C. sulphur
D. oxygen
Answer: Option A
8. Non stick cooking utensils are coated with
A. Teflon
B. PVC
C. black paint
D. polystyrene
Answer: Option A
9. Monazite is an ore of
A. titanium
B. zirconium
C. iron
D. thorium
Answer: Option D
10. Carbon, diamond and graphite are together called
A. allotropes
B. isomers
C. isomorphs
D. isotopes
Answer: Option A
