Learn the answers to the most common CBSE 8th Class Science Question Paper PDF, including questions about physics, chemistry, biology, and more. Find clear and concise explanations that will help you understand the concepts and ace your exams.
CBSE Class 8, Science, 140 Important Questions
CBSE 8th Class Science Question Paper PDF
1.Why are chloroplast found only in plant cells?
2.Explain the process of photosynthesis.
Write a note on nucleus of a cell.
Draw a neat diagram of a Nerve Cell.
What is the difference between an animal cell and a plant cell?
4. Explain cytoplasm in brief.
5.What is magnetic effect of electric current?
6.Name some substances which make the liquids good conductor of electricity.
7. What are insulators of electricity?
8.Prepare a tester to test conduction based on magnetic effect of the electricity.
9.Name some substances other than water which conducts electricity?
10.What is the purest form of carbon?
11.What is coal tar? What are its uses?
12.State some harmful effects of using fossil fuels?
13.Why CNG is called clean fuel?
14.Write the names of two natural substances.
15.Name the clean fuel recommended to use in buses.
16.Do all the substances catch fire on same temperature?
17.What is deforestation? What is its effect?
18.What is the principle of fire extinguishing?
19.Give two examples of two solid fuels .
20.How does fire brigade work?
21.What is the principle of fire extinguishing?
22.Why Kharif crops cannot be grown in Rabi season?
23.Explain the process of transplantation.
24.Why should we grow seeds in moist soil?
25.Why is it necessary to dry grains before storing them?
26.Name the two fertilizers containing nitrogen and other containing phosphorous.
27.Give examples of two Rabi and two Kharif crops.
28.Why is it necessary to sow seeds at appropriate depth?
29.What are the basic practices of crop production?
30.How can we decide whether an object is moving faster than the other.
CBSE 8th Class Science Question Paper PDF
31. A ball is in rest. When it is pushed, why it starts moving?
32.Does liquids and gases also exert pressure?
33.We observe that the wheels of buses and trucks are heavier than the wheels of car or scooters. Why?
34.Give two examples of a situation in which applied force causes a change in the shape of an object.
35.How to change the speed and the direction of a moving body?
36.What are the efftects of force?
37.If the area of head is 15cmX15cm, how much air (in weight) would you carry on your head?
38.What do you meant by pressure? How can we increase the pressure by exerting same force?
39.Identify the agent exerting force and the object on which it acts when a piece of lemon is squeezed between fingers and juice come out.
40.Why do kabaddi players rub their hands with soil?
41.The sole of shoes get worn after some time. Explain why?
42.What is sliding friction?
43.Why we fall down when we stop on banana peel?
44.What is drag?
45.What is easier- rolling or sliding?
46.Which is less sliding friction or static friction?
47.Give two examples where friction is undesirable?
48.What is a fluid friction? Write the factors on which fluid friction depends.
49.Which type of surface produces more friction?
50.What is blind spot?
CBSE 8th Class Science Question Paper PDF
51.Which cells of the retina are sensitive to bright light and color?
52.Where does the image form in our eye?
53.What is the distinct vision of normal eye?
54.What is blindness? How many types of blindness do we know about?
55.How will you prove that the angle of incidence is equal to the angle of reflection.
56.Define normal?
57.What is the shape of human eye?
58.Define angle of incidence?
59.Give two examples of microorganisms.
60.What is vaccine?
61.What do you mean by vaccination?
62.Who discovered the antibiotics?
63.Where do Rhizobium bacteria commonly live?
64.Where do Rhizobium bacteria commonly live?
65.What are microorganisms or microbes?
66.What are viruses? Name some common diseases in human caused by virus.
67.What are carriers of disease causing microbes? Explain with the help of two examples.
68.What are food preservatives? Explain some common food preservatives.
69.Explain the discovery of Pencillin.
70.What do you mean by portable water
71.When was Ganga action plan launched?
72.Which radiation is absorbed by CO2?
73.Name one element present in exhaust of automobiles.
74.Which rays are harmful for us?
75.What do you mean by Van Mahotsav?
76.Explain process of water treatment to make it drinkable.
77.Which gas is responsible for greenhouse effect?
78.Which fuel is pollution free?
79.When do noticeable changes begin in human in adolescence?
80.What is the name of hormone produced by pancreas?
CBSE 8th Class Science Question Paper PDF
81.What is the most important change marked by puberty?
82.Name the virus that causes AIDS. What are the medium through which this virus is transmitted?
83.Name female hormone.
84.What is menopause?
85.What are chromosomes?
86.Define reproduction. What are the two modes of reproduction?
87.Explain various modes of asexual reproduction.
88.How asexual reproduction in hydra is carried out? Explain with diagram.
89.Which organ produces egg in female human body?
90.What do mean by test tube baby?
91.What are the various methods of asexual reproduction?
92.What is ovum?
93.What is a male gamete?
94.What is metamorphosis?
95.What are the three destructive natural phenomena?
96.Write the nature of the charges on a glass rod and silk cloth when they are rubbed with each other.
97.How can charging take place when the substances are rubbed?
98.Explain construction and working of electroscope.
99.What are the harmful effects of lightening on a lightening victim.
100.Explain working mechanism of thunderstorm.
CBSE 8th Class Science Question Paper PDF
101.Who established relation between sparks produced by amber and the thunderstorm?
102.Name two destructive phenomena.
103.What is a seismograph? How does it work?
104.What is the full form of IAU.
105.Name the inner planets
106.How many planets are there in solar system?
107.What are the objects like stars and the planets seen in the sky called?
108.From where the polar star is not visible.
109.What is the sun? Name next nearest star. Write the distance of sun from the earth? Write the unit of the large distances.
110.Why do we classify the sun as a star?
111.Which star is called morning or evening star?
112.Name the star which is nearest to earth.
113.Write the names of two constellations .
114.Give some uses of PET .
115.Give examples to show that plastics are noncorrosive in nature.
116.Give three advantages of rayon.
117. Is nylon fibre so strong, that we can use it to make parachutes?
118.What are the advantages of using fabrics made of polyester?
119.What is Red Data Book?
120.What do you mean by migration? Write causes of migration.
121.What is the tiger Project? When it was launched?
122.What is the major threat to survival of organism?
123.Name the part of earth which supports the biodiversity.
124.Sodium is stored in kerosene. Why?
125.Explain the reactions of metals and non-metals with (i) Acids (ii) Air (iii) Water.
126.Explain displacement reaction with the help of an activity.
127.What are oxides? Write the nature of metallic and non-metallic oxides.
128.Write the uses of metals and non-metals.
129.List some physical properties of the metals.
130.What happens when a magnesium ribbon is heated in presence of air?
131.Give one example of displacement reaction.
132.Explain the reaction of sodium and water, with the help of an activity.
133.Touch the bell when it stops producing sound. Can you feel the vibration? What do you understand by this?
134.What is ektara? Identify its vibration part.
135.Name some musical parts and their vibrating parts
136.How does shrillness or pitch is affected by frequency?
137.Do all animals produce sound by vocal chords?
138.Explain importance of sound in our daily life.
139.Name the organ in human that produces sound. How does it work?
140.How does loudness of sound is affected by amplitude?
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