Question

20. The angle of incidence is the angle between -
a) Incident ray and Mirror b) Incident ray and Normal
c) Incident ray and Reflected ray d) Reflected ray and Mirror
21. Elephant uses its trunk as -
a) Arms
b) Snorkel c) Hands d) All of these
22. Meteorologists are the scientists who study -
a) Meteors b) Matter c) Weather d) Metro Train
23. Sea breeze occurs during -
a) Day
b) Night
c) Both
d) Never
24. Mirror used in back view mirrors is -
a) Concave b) Convex c) Plane d) Plano-concave
25. If a person is caught outside during lightening, he should go -
a) Inside a house
b) Under a tree
c) Under a tower
d) In water
26. Attraction occurs between -
a) Unlike charges
b) Like charges
c) Charged and Uncharged bodies d) A and C both
27. Which of these is the lowest horizon of soil?
a) Sub soil b) Horizon A c) Bed rock d) Horizon o
28. Diaphragm separates -
a) Heart from lungs
b) Chest cavity from lower abdomen
c) Upper and Lower abdomen d) Food pipe and Windpipe
29. How many times an adult breathes per minute -
a) 20-30
b) 14-20 c) 14-35 d) 30 - 45
30. Processes that take place in plants during day are-
a) Respiration
b) Photosynthesis
c) Respiration and Photosynthesis d) None
31. Organ of exchange of gases in earthworm is -
a) Gills
b) Lungs c) Tracheae
32. Heat is transferred in solids by -
a) Conduction
b) Convection
c) Both
d) Movement of particles
33. A slight bend in the capillary tube of clinical thermometer is called -
a) Kink
b) Constriction c) Fold d) A and B both
34. The chemical symbol Ag represents the element-
a) Nitrogen b) Gold
c) Silver d) Argon
35. Lichen is a symbiotic association between an Alga and a
a) Fungus b) Bacteria c) Protozoa d) Animal
36. Incisors help in -
a) Chewing b) Cutting c) Tearing d) Grinding
37. The hardest substance in a human body is -
a) Bone
b) Cartilage c) Enamel d) Nail
38. How many sets of teeth do we get in our life -
a) Four
b) Two
c) Twenty d) Thirty-two
39. Organism feeding on dead and decaying matter is -
a) Parasite b) Saprotroph
c) Host
d) Herbivore
40. Substances that can be charged by rubbing are -
a) Ebonite b) Opal
c) Rock salt d) All of these
d) Skin​

Answer 1

Answer:

21.

a. incident ray and mirrors

22.

d. all of these

23.

ç. both

24.

ç. plane

25.

inside of house

26.

both

27.

sub soil

28.

chest cavity from lower abdomen

29.

20-30

30.

photosynthesis

31.

trachea

32.

conduction

33.

A and B both

34.

Gold

35..

36.

cutting

37.

Bone

38.

FOUR

39.

saprotrops

40.

Ebonite

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