1.
The
conservation of hawks and owls is important to mankind chiefly because these
birds eat:
a. numerous weed seeds
b.
harmful
birds
c.
many harmful rodents
d.
harmful
reptiles
2.
If
the plane of the earth’s equator were not inclined to the plane of the earth’s
orbit:
a.
the
year would be longer
b.
the
winters would be longer
c.
there would be no change of seasons
d. the summers would be warmer
3.
Which of the following vitamins is helpful for
coagulation of blood?
a. C
b. D
c.
E
d. K
4.
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
5.
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
6.
Vitamin B12 is most useful for combating:
a.
Anaemia
b. Goiter
c. night blindness
d. Rickets
7.
A transistor is most likely to be found in a:
a. Fuse
b. fluorescent
lamp
c.
hearing
aid
d. wrist watch
8. 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
9. 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
10. 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
11. 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.
of its mineral content
12. Which of the following acts as a resistance against disease
in the body?
a.
Carbohydrates
b.
Red
corpuscles
c.
Vitamins
d.
White corpuscles
13. 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
14. The chief constituent of Gobar Gas is:
a.
Ethane
b.
Methane
c.
Hydrogen
d.
carbon
dioxide
15. Who is credited with the development of polio vaccine?
a.
Linus
Pauling
b.
Jonas Salk
c.
Melvin
Calvin
d.
Selman
Waksman
16. 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
17. The clear sky looks
blue because of:
a.
reflection
of light
b.
refraction
of light
c.
diffraction
of light
d.
dispersion of light
18. Which of the following in the human body is popularly called
the ‘Adam’s Apple’?
a.
Adrenal
b.
Liver
c.
Thyroid
d.
Thymus
19. Which one of the following substances is obtained by the
fractionation of human blood?
a.
Antivenom
serum
b.
Gamma globulin
c.
Polio
vaccine
d.
Diphtheria
antitoxin
20. 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