CBSE Class 10th Science important 3 and 5 marks questions

CBSE Class 10th Science important 3 and 5 marks questions

10th CBSE Exam Tips

CBSE Class 10th Science important 3 and 5 marks questions

Below article focuses on various important 3 and 5 marks questions for class 10th science CBSE students for the final preparation of board examination, questions are more preferable for  the advanced preparation for the exam.

All the below questions updated by our experienced faculty and an experience team for providing you the best preparation for your final board examination. The below articles contains all the  3 and 5 marks important questions which are mostly and have maximum chances for  asking in examination.

Go through the below article for the most important  3 and 5 marks  questions for class 10th science:


CBSE Class 10 Science important 3 marks questions


Question. (a) Why do we classify elements?

(b) What are the two criteria used in the development of Modern Periodic Table?

(c) What is meant by periodicity in properties of elements with reference to the periodic table?


Question. Give reasons for the following: (a)  Arteries are thick walled.

(b) Blood goes only once in one cycle through the heart in fishes.

(c) Plants have low energy needs.


Question. How are we able to see distant and near by objects clearly? Which part of eye helps in changing curvature of lens? Why no image is formed at blind spot?


Question. (a) What are the functions performed by the testis in human beings?

(b) Why do testes in mammals descend into scrotum?


Question.  Explain the path from the stimulus to the response, for a receiving tennis player?


Question. (a) Explain 10% Law in reference to the flow of energy across various Trophic Levels.

(b) Find out the amount of Energy available to Eagles in a Food Chain consisting of Carrots – rabbit – snake – eagle. Assume 1, 000 J of energy is available to Carrot plants from the Sun.


Question. State any three advantages of using charcoal over wood?


Question. All the variations in a species do not have equal chances of survival. Why?


Question. What are living fossils? Give two examples of living fossils?

Explain the three pathways of breakdown of glucose in living organisms.


Question. (a) Explain the term “rancidity”. Name and explain the type of chemical reactions responsible for causing rancidity.

(b)Write three methods for preventing rancidity of food.

Question. The resistance of a wire of 0.01 cm radius is 10. If the resistivity of the material of the wire is 50 × 10−8 ohm meter, find the length of the wire.


CBSE Class 10 Science important 5 marks questions


Question. (a) How does a bar magnet differ from an electromagnet.

(b) What type of core should be put inside a current-carrying solenoid to make an electromagnet?

(c) How can you find out the direction of the magnetic field produced by a current-carrying conductor?


Question. (a) State the Joule’s laws of heating and express these in the form of a mathematical equation.

(b) 80 J of heat is produced each second when current is passed through a 5Ω resistance. Find the potential difference across the resistor.


Question. Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.

(a) Will the bulb in the two circuits glow with the same brightness? Justify your answer.

(b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.


Question. (a) What is the required condition to make a glass lens placed in a transparent liquid invisible?

(b) Describe and illustrate with a diagram, how we should arrange two converging lenses so that a parallel beam of light entering one lens emerges as a parallel beam after passing through the second lens.

(c) A convex mirror of focal length 25 cm forms image of magnification 7 5 for one position of the object. The object is shifted by 4 25 cm towards the mirror. By what distance and what direction the image will move?


Question. (a) Why are bacteria and fungi called decomposers? What is the role of decomposers in the ecosystem?

(b) Explain the phenomenon of ‘biological magnification.’ How does it affect organisms belonging to different trophic levels?  


Question. (a) Mention the pH range within which our body works. Explain how antacids give relief from acidity. Write the name of one such antacid.

(b) Fresh milk has a pH of 6. How does the pH will change as it turns to curd? Explain your answer.

(c) A milkman adds a very small amount of baking soda to fresh milk. Why does this milk take a longer time to set as curd?

(d) Mention the nature of toothpastes. How do they prevent tooth decay?


Question. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the position of the image formed.

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