1.
Which
of the following vitamins is helpful for coagulation of blood?
a.
C
b.
D
c.
E
d.
K
2.
For
purifying drinking water, alum is used:
a. for coagulation of mud particles
b.
to
kill bacteria
c.
to
remove salts
d.
to
remove gases
3.
A
weather balloon is not fully inflated on the ground because:
a.
if
the balloon is fully inflated, it may not remain stable in a storm
b. the air inside the balloon expands as it rises and may
burst
c.
it
cannot withstand the outside pressure if fully inflated
d.
None
of these
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4.
Vitamin
B12 is most useful for combating:
a. Anaemia
b.
Goiter
c.
Night
blindness
d.
Rickets
5.
A
transistor is most likely to be found in a:
a.
Fuse
b.
fluorescent
lamp
c. hearing aid
d.
wrist
watch
6. A
person born with the inner ear missing:
a. would
not have the Eustachian tube
b.
would never be able to hear sound
c. would
be able to hear only with an electronic hearing aid
d. could
only hear a loud explosion
7. The
possibility of hereditary variation is greatest when:
a. self-fertilisation
occurs, as in some plants
b. an
abundant amount of food is provided for the egg
c.
organisms reproduce sexually
d. organisms
reproduce asexually
8. Steel
is more elastic then rubber because:
a. its density is high
b. it
is a metal
c. ratio of stress to strain is more
d. ratio
of stress to strain is less
9. The
chief purpose if crop rotation is to check the loss of topsoil:
a. by
water erosion
b. by
wind erosion
c. by
weathering
d.
by its mineral content
10. Which
of the following acts as a resistance against disease in the body?
a. Carbohydrates
b. Red
corpuscles
c. Vitamins
d. White corpuscles
11. What
is function of a dynamo?
a. To
convert heat energy into light energy
b. To
convert light energy into heat energy
c.
To convert mechanical energy into electrical energy
d. To
convert electrical energy into mechanical energy
12. The
chief constituent of Gobar Gas is:
a. Ethane
b.
Methane
c. Hydrogen
d. Carbon
dioxide
13. Who
is credited with the development of polio vaccine?
a. Linus
Pauling
b.
Jonas Salk
c. Melvin
Calvin
d. Selman
Waksman
14. Which
one of the following statements regarding sound is true?
a. It
travels at its greatest speed in vacuum.
b. It
produces transverse vibrations in the medium in which it travels.
c.
Its source is always a vibrating material.
d. It
cannot travel through liquids.
15. The
clear sky looks blue because of:
a. reflection
of light
b. refraction
of light
c. diffraction
of light
d. dispersion of light
16. Which
of the following in the human body is popularly called the ‘Adam’s Apple’?
a. Adrenal
b. Liver
c.
Thyroid
d. Thymus
17. Which
one of the following substances is obtained by the fractionation of human blood?
a. Antivenomserum
b.
Gamma globulin
c. Polio
vaccine
d. Diphtheria
antitoxin
18. Of
the blood groups A, B, AB and O, which one is transfused into a person whose
blood group is A?
a. Group
A only
b. Group
B only
c.
Group A and O
d. Group
AB only
19. The
three abundant elements in the earth’s crust are aluminium, oxygen and silicon.
The correct order of their abundance is:
a. oxygen,
aluminium, silicon
b. aluminium,
silicon, oxygen
c. oxygen,
silicon, aluminium
d. silicon, oxygen, aluminium
20. Penicillin
is widely used as:
a. an antiseptic
b. a
disinfectant
c.
an antibiotic
d. an insecticide
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