1) Which of the following has no blood but respires?
a) earthworm
b) hydra
c) cockroach
d) fish
2) Which type of respiratory organs are present in spiders and scorpions?
a) book lungs
b) gill books
c) gills
d) lungs
3) At high altitude, RBCs of human blood will
a) increase in number
b) decrease in number
c) decrease in size
d) increase in size
4) Vocal cords occur in
a) pharynx
b) glottis
c) bronchial tube
d) larynx
5) Which one of the following structures closes the respiratory passage during ingestion of food?
a) larynx
b) epiglottis
c) hard palate
d) soft palate
6) The covering of lungs is called
a) pericardium
b) pleural membrane
c) perichondrium
d) peritoneum
7) The narrowest and most numerous tubes of lungs are termed as
a) bronchus
b) alveoli
c) bronchioles
d) hilum
8) The exchange of gases in a mammal takes place is
a) trachea
b) bronchioles
c) bronchi
d) alveoli
9) The mirror used in automobiles to see the rear field of view is
a) concave
b) convex
c) plane
d) none of these
10) The mirror used in search lights is
a) concave
b) convex
c) plane
d) none of these
11) Shaving mirrors are
a) convex mirrors
b) concave mirrors
c) plane mirrors
d) none of these
12) The laws of reflection are true for
a) the plane mirror only
b) the concave mirror only
c) the convex mirror only
d) all reflecting surfaces
13) When the object is at focus of a concave mirror, the image is formed at
a) focus
b) centre of curvature
c) within focus
d) infinity
14) Which of the following is a non-luminous body?
a) fire
b) sun
c) stars
d) earth
15) A body which allows most of the light to pass through it is called a
a) transparent body
b) opaque body
c) translucent body
d) none of these
16) The mercury barometer was invented by
a) Celsius
b) Fahrenheit
c) Torricelli
d) Bernoulli
17) The buoyant force depends on
a) depth of a liquid
b) colour of a liquid
c) density of liquid
d) none of these
18) The hot air balloon rises because it is
a) denser
b) less dense
c) equally dense
d) the given statement is wrong
19) A boat full of iron nails is floating on water in a lake. When the iron nails are removed, the water level
a) rises
b) falls
c) remains the same
d) nothing can be said
20) An ice cube is floating in a glass of water. What happens to the water level when the ice melts?
a) rises
b) falls
c) remains same
d) first rises and then falls
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