I. CHOOSE THE CORRECT ANSWER: 10×1= 10
1. International Unit of measuring temperature is ____
a) Kelvin. b) Fahrenheit c) Celsius d) Joule
2. Small amounts of electrical current are measured in milliampere(mA). How
many milliampere are there in 0.25A?
a) 2.5mA b) 25mA c) 250 mA d) 2500 mA
3. The chemical change is ____
a) water to clouds b) growth of a tree c) Cow dung to bio-gas d) ice-cream to
molten ice- cream.
4. ____ is an example of a periodic change.
a) Earthquake b) Formation of rainbow in sky c) occurrence of tides in seas
d) showering of rain
5. ____ of the following are endothermic changes.
a) condensation and melting b) condensation and freezing c) Evaporation
and melting d) Evaporation and freezing.
6. Basis Unit of life___________.
a) cell b) protoplasm. c) cellulose d) Nucleus
7. ____ helps in cell division.
a) Nucleus b)Endoplasmic reticulum c) Golgi complex d) cnetrivole.
8. Suitable term for the various components of cell is ______
a) Tissue b) Nucleus c) cell d) cell organelle.
9. The largest division of the living world is ____
a) order b) kingdom c) phylum d) Family.
10. Who proposed the five kingdom of classification?
a) Aristotle b) Linnaeus c) Whittaker d) plato.
II. FILL IN THE BLANKS 10 × 1 = 10
11. The common laboratory thermometer is a ____ thermometer.
12. ______is used to measure the electric current.
13. Spoiling of food is a _____ change.
14. The jelly like substance present in the cell is ____
15. Unicellular organisms can only be seen under a ____
16. The direction of conventional current is ___ to electron flow.
17. Filling up a balloon with hot air is a ____ change.
18. Species is the ___ unit of classification.
19. The binomial name of onion is ____
20. Carolus Linnaeus is known as the Father of ____
Ill.MATCH THE FOLLOWING: 10×1=10
21. Heat – safety device used in electric circuit.
22. Fuse – used to open or close a Circuit.
23. Switch – water to steam.
24. Melting – a form of energy
25. Evaporation – ice cube to water
26. Transporting channel – Nucleus
27. Suicidal bag – Endoplasmic Reticulum
28. Control Room – Lysosome
29. Power house – chloroplast
30. Food producer – mitochondria
IV. True or False: 10 X 1 =10
31. Electron flow is in the same direction to conventional Current flow.
32. In a parallel circuit , the electric components are divided into branches.
33. Cutting of cloth is an example of a periodic change.
34. Taking a glass of water and freezing it by placing it in the freezer is a
chemical change.
35. The electrical conductivity of the semiconductor is in between a conductor
and an insulator.
36. Animal cells have a cell wall.
37. Cell membrane is fully permeable.
38. Only plant cells have chloroplasts.
39. Human stomach is an organ.
40. Ribosomes are small organelles with a cell membrane.
V . ANALOGY: 5 × 1 = 5
41. Water: pipe : : Electric current: _____
42. Physical change: Boiling :: chemical change ______
43. Adipose:tissue:: eye: ____
44. Cell wall: plant cell:: Centriole :____
45. Copper: conductor:: Wood : ____
VI. VERY SHORT ANSWER :( Any 5 questions). 5×2=10
46. Name the device used to generate electricity.
47. What is a battery?
48. Mention any two exothermic reactions.
49. Growing of nails is a periodic change. Why?
50. What does cell membrane do?
51. What are the main things in a nucleus?
52. What is classification?
VlI. ANSWER IN BRIEFLY. (Any 6 questions) 6 × 3=18
53. What is the use of kink in clinical thermometer ?
54. Differentiate parallel and serial circuits.
55. Distinguish physical and chemical changes.
56. Is solar eclipse a periodic change ? Give your reason.
57. Why the cell is very important for us ?
58. Write a short note on nucleus.
59. Differentiate plantae and animalia.
60. Write any two merits of Five Kingdom classification.
VllI .GlVE LONG ANSWER: (ANY FOUR QUESTIONS) 4×5=20
61. Draw the diagram of a clinical thermometer and label its parts .
62. Explain the construction and working of an Telephone.
63. How the iron blade is fixed into a wooden handle in tools used to dig the
soil ?
64. Write about any three organelles in detail.
65. Explain the following statement. Digestion is a chemical change.
66. Write short notes on - Binomial Nomenclature.
lX. DRAW THE DIAGRAM AND LABEL THE PARTS: (ANY TWO )
2 × 2 ½ = 5
67. Mitochondria.
68. Animal cell
69. Nucleus
Answers
Explanation:
Q.3 Write true and false.
1. Leaves make food for plant.
2. Friction slows or stops a moving object.
3. Boiling the water kills germs present in it.
4. Drinking water should always be stored in clean containers
5. All planets do not revolve around the sun.
6. Venus is the smallest planet.
7. Venus has two moons.
Answer:
Biogas is the mixture of gases produced by the breakdown of organic matter in the absence of oxygen (anaerobically), primarily consisting of methane and carbon dioxide. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. Biogas is a renewable energy source.

Pipes carrying biogas (foreground) and condensate
Biogas is produced by anaerobic digestion with methanogen or anaerobic organisms, which digest material inside a closed system, or fermentation of biodegradable materials.[1] This closed system is called an anaerobic digester, biodigester or a bioreactor.[2]
Biogas is primarily methane (CH
4) and carbon dioxide (CO
2) and may have small amounts of hydrogen sulfide (H
2S), moisture and siloxanes. The gases methane, hydrogen, and carbon monoxide (CO) can be combusted or oxidized with oxygen. This energy release allows biogas to be used as a fuel; it can be used for any heating purpose, such as cooking. It can also be used in a gas engine to convert the energy in the gas into electricity and heat.[3]