CBSE Class 8 Science Sample Paper Set I. It’s always recommended to practice as mane sample papers as possible before the examinations. Students can download the sample papers and also question papers of previous years to practice and score better marks in examinations. Refer to other links too for more sample papers.
Q1. What is cutting of mature plants called?
Q2. What is the term given to lowest temperature at which a substance burns.
Ans2 – Ignition temperature
Q3. Define Deforestation.
Ans3- Clearing of forests /trees and using the land for other purposes.
Q4. Name the process of reproduction in hydra.
Ans 4- Budding.
Q5. Name the device used to test whether an object is carrying a charge or not.
Q6. What is carbonization?
Ans6 – Carbonisation is the Slow process of Formation of coal from dead vegetation,under high temperature, pressure and absence of oxygen.
Q7. Draw a well labelled diagram of a candle flame.
Q8. Give the units of frequency and loudness.
Ans8- SI Unit of frequency-hertz
SI Unit of loudness/amplitude- meter
Q9. State the laws of reflection and draw the diagram.
Ans9 – I) -First law states that the incident ray, the normal and the reflected ray ,all lie in the same plane.
II) Second law states that Angle of incidence is equal to angle of reflection.
Q10.What is an earthquake and how is it measured?
Ans10- Earthquake is sudden shaking or trembling of the earth which lasts for a very short time.
It is caused by disturbance deep inside the earth’s crust. It can cause damage to life and property.;
It is measured by an instrument called seismograph/. The power of its magnitude is expressed on Richter scale.
Q11.What is lightning conductor? How does it work?
Ans11- Lightening conductor is a safety device which protects the buildings from the effects of lightning.
When lightning strikes a building, its tall metallic rod provides an easy route for the transfer of electric charge to the underground. The charges pass through the conductor and goes into the underground plate.
Q12. Differentiate between zygote and foetus.
Ans 12- zygote-It is unicellular, no body parts formed, formed in the oviduct after fertilisation Foetus- It is multi cellular; body parts can be identified; formed in the uterus from embryo.
Q13.Explain the process of formation of petroleum.
Ans13- Millions of years ago ,dead microscopic organisms living in the sea got settled at the bottom of the sea and got covered with sand and clay .Under high pressure and temp. , absence of air, slowly got converted into petroleum over a period of millions of years.
Q14.What is meant by combustion? Write any two conditions necessary for combustion?
Ans14- Burning of fuel in the presence of oxygen to give off heat and light is called combustion. Presence of Oxygen/ignition temp./Presence of fuel
Q15. Identify the part which vibrates to produce sound in the following instruments.
Ans15-(i) –Dholak – stretched membrane
(ii)Sitar –stretched strings
(iii)- Flute- air column
Q16. What are the characteristics of the image formed by plane mirror?
Ans 16-Image formed by plane mirror is Virtual and erect,of same size as that of the object, at same distance from mirror as that of the object; laterally inverted.
Q17. What is a constellation name any two constellations and draw sketches to show the relative positions of prominent stars in them.
Ans 17Constellation is a group of countable number of stars forming a recognisable shape or figure.
Ex: Ursamajor, Orion
Q18. I) Define light year.
ii) What are artificial satellites ?
iii) What are their uses (Any Two).
Ans 18-Light year is the distance travelled by light in one year.
(ii)Artificial satellites are manmade satellites which revolve around a planet/earth.
(iii)Uses-Remote sensing/weather forecasting/ tele-communication.
Q19. Mention one use each of (i) Coke (ii) Coal gas (iii) Bitumen.
Ans 19- Coke- Extraction of metals/steel formation Coal gas –As a fuel
Bitumen- for road surfacing/paints
Q20. i) What are the advantages of using manures?
ii) Explain how fertilizers are different from manures.
Ans 20- i) Manures increases water holding capacity of soil.
Makes soil porous for easy exchange of gases/friendly microbes increases.
ii) Difference between manure and fertilisers
1. Manure is an organic substance.
2.It is obtained from the decomposition of plant or animal wastes
3. It rich in multiple nutrients.
1. Fertilisers are chemical substances.
2. It is produced in factories
3. They are rich in a particular nutrient.
Q21. Define asexual reproduction. Name two methods of asexual reproduction .Explain any one and draw the diagram.
Ans21- Asexual reproduction is that in which new generation is produced from a single parent withoutfertilisation.
Two methods of asexual reproduction are
1 Budding in hydra
2. Binary fission in amoeba
Amoeba is a single-celled organisms. It begins the process of reproduction by the division of its nucleus into two nuclei. This is followed by division of its body into two, each part receiving a nucleus. Finally, two amoebae are produced from one parent amoeba .This type of asexual reproduction is called binary fission.
Please click the link below to download CBSE Class 8 Science Sample Paper Set I.