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
d) Skin
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​

Answer 1

Answer:

20)- Incident ray and Reflected ray

21)- hands

22) - weather

23)- day

24)- convex

25)- inside the house

26)- unlike charges

27)- horizen

28)- heart and lungs

29)- 14-35

30- photosynthesis

31)- skin

32)- conduction

33)- kink

34)- silver

35)-fungus

36)- chewing

37)- Enamel

38)- Two

39)- Herbivore

40)- Ebonite