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
2. Galvanised iron sheets have a coating of
A. lead
B. chromium
C. zinc
D. tin
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
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
5. Heavy water is
A. deuterium oxide
B. PH7
C. rain water
D. tritium oxide
6. The chemical (ethyl mercaptan) added to the otherwise odorless LPG cooking gas for imparting a detectable smell to the gas is a compound of
A. bromine
B. fluorine
C. chlorine
D. sulphur
7. The element common to all acids is
A. hydrogen
B. carbon
C. sulphur
D. oxygen
8. Non stick cooking utensils are coated with
A. Teflon
B. PVC
C. black paint
D. polystyrene
9. Monazite is an ore of
A. titanium
B. zirconium
C. iron
D. thorium
10. Carbon, diamond and graphite are together called
A. allotropes
B. isomers
C. isomorphs
D. isotopes
Answers:-
1. (C)
2. (C)
3. (C)
4. (A)
5. (A)
6. (D)
7. (A)
8. (A)
9. (D)
10. (A)
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