1 Nail polish remover contains ?
A. benzene
B. acetic acid
C. acetone
D. petroleum ether
2. What nucleus of atom contains ?
A. protons
B. electrons
C. electrons and protons
D. protons and neutrons
3. The isotope atoms differ in ?
A. number of protons
B. atomic number
C. number of neutrons
D. atomic weight
4. Human bone does not contain
A. calcium
B. carbon
C. oxygen
D. phosphorous
5. Homo nuclear molecules contain ?
A. polar bond
B. covalent bond
C. ionic bond
D. coordinate bond
6. Air contains maximum amount of
A. oxygen
B. nitrogen
C. hydrogen
D. carbon dioxide
7. Washing soda is ?
A. sodium sulphite
B. sodium bicarbonate
C. sodiun carbonate
D. sodium biosulphite
8. Natural rubber is a polymer derived from ?
A. ethylene
B. propylene
C. isoprene
D. butadiene
9. The chemical used as a fixer in photography is ?
A. sodium thiosulphate
B. sodium sulphate
C. borax
D. ammonium sulphate
10. Water drops are spherical because of ?
A. viscosity
B. density
C. polarity
D. surface tension
ANSWERS : 1.C 2.D 3.C 4.C 5.B 6.B 7.C 8.C 9.A 10.D
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