1.Wood charcoal is used in gas masks
because :
a)it is
poisonous
b)it is
porous
c)it
liquefies gas
d)it adsorbs
gases
Ans: d)it adsorbs gases
2.The disease caused by a protozoan:
a)AIDS
b)Malaria
c)Chicken
guniya
d)Typhoid
Ans: b)Malaria
3. A protein solution on warming with
concentrated nitric acid may turn yellow called:
a)Biuret
test
b)Millions
test
c)Xanthoproteic
test
d)Hopkins
cole test
Ans: c)Xanthoproteic
test
4. The same group elements are characterized by:
a)Ionisation
potential
b)Electronegativity
c)Ionisation
energy
d)Number of
electrons in the outermost shell
Ans: d)Number of
electrons in the outermost shell
5.Acetyl salicyclic acid is known as
a)Salol
b)Picric
acid
c)Aspirin
d)Oil of
Wintergreen
Ans: c)Aspirin
6. The distance of stars from earth
is expresses generally interms of
a)metre
b)kilometer
c)light year
d)astronomical
unit
Ans: c)light year
7. High boiling point of water is due
to:
a)weak
dissociation of water molecules
b)high
dissociation of water molecules
c)hydrogen
bonding amongst water molecules
d)Vanderwaals
force of attraction amongst the molecules
Ans: c)hydrogen bonding
amongst water molecules
8. Eutrophic lakes meansa)lake poor
in nutrients
b) lake
lacking water
c) lake poor
in flora and fauna
d) lake rich
in nutrients
Ans: d) lake
rich in nutrients
9. What is the scientific phenomenon
behind the working of bicycle reflector?
a)reflection
b)refraction
c)defraction
d)total
internal reflection
Ans: d)total internal reflection
10. An emulsion is a colloidal system
consisting of
a) one gas
and one liquid
b)two solids
c)two
liquids
d)one gas
and one liquid
Ans: c)two liquids