CBSE-10-SCIENCE BOARD-IMPRTANT-QUESTIONS

 CBSE CLASS 10 Board Exam Important Questions and Answers

                                                                

ABOUT BOARD EXAM

CBSE conducts board exams every year for classes 10th and 12th, and lakhs of students are enrolled in them. Those students who get daily notes and explanations for their doubts and regular revision get passed in the exam with high marks. 

 Some students are not able to get the study material and the question bank for the exam due to the distant or remote area, but thanks for the internet facilities that made the notes and the study material accessible for the students.

This blog will help students to find all the important questions for the exams, and they will be able to secure good marks in the exam. Students can also ask their doubts regarding the exam; I will provide the study content or the video content for the topic that can be helpful for them.

I have tried to provide the important content for the students that can be useful for their board exams

It is written in simple language, easy to understand and apply.

1. Science for Class 10
Chapter 1-2 important questions and answers can be download from here

Chapters 2-4 important questions download from here

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Glimpses of Important questions

1. What is the effect of the H⁺ ion on the solution?

Answer: As the concentration of the H⁺ ion increases, the solution becomes more acidic, and if the concentration decreases, then it becomes more basic in nature.

2. Do basic solutions have H⁺ ions in their solution? If yes, why are they basic? 

Answer: Yes, basic solutions contain H⁺ ions in their solution, but the concentration is weaker in comparison to the OH⁻ ions. Therefore, they are basic in nature.

3. What is the formula for washing soda?  What are its uses? 

Answer: The formula of washing soda is Na₂CO₃.10H₂O; it is said as sodium. carbonate decahydrate. It is used for (i) (i) removing the permanent hardness of the water and (ii) preparing borax.

 

Treatment of indigestion is done by the use of the antacid. 

Alkali metals like Li, Na, and K are soft; they can be cut by a knife.

 Carbon has many allotropes due to its small size, having only two shells and 4 electrons in the last shell, it has tetravalency. It can form long chains and branched structures.

Ores have lots of impurities of oxide, sulfide, silica, etc., so they go under extraction and purification processes.

Bonding of Carbon atom

Carbon generally forms single, double, and triple covalent bonds with the other elements. 

Carbon shares 1, 2, or 3 electrons present in the second shell to complete its octet and become stable.

Sharing of one, two, or three electrons are called a single, double, or triple covalent bond, respectively.

Question: Describe the formation of the micelles and their action. (Long question)

Question: Name any two major sources of heat energy from carbon. 

**************Life Processes****

Q1: Why is the diffusion process considered an inefficient process for multicellular organisms?

Q2: Describe the autotrophic mode of nutrition.  

Q3: Describe the photosynthesis process. 

Q4: How does Ameoba get its nutrition?

Q5: What is the role of the stomach in the digestion of the food?

Q6: Describe the human digestive system.

Q7: Write the full form of ATP and write its role.

Q8: Describe the respiration in plants.

Q9: Describe the function of the heart.

Q10: Label the figures

Q11: Explain hemodialysis. 

Q12: Name the device to monitor the blood pressure.

********* Control and Coordination *******************

1. Describe the stimulus.

2. What do you mean by the reflex arc, and what is its utility?

3. Describe the function of the human brain.

4. Give the names of two sensitive plants.

5. Give the names of the plant hormones and their actions.

6. Which hormone of the plant is for growth, and which is for the growth inhibition?

7. Describe the different ways of oxidation of glucose to give the energy.

8. Label the Nerve cell (image will be given)

9. Which part of the brain maintains the posture and equilibrium of the body? (Cerebellum)

10. Name the hormones produced by the thyroid gland, pancreas, and pituitary gland, and explain their work.

11. Explain the various modes of reproduction.

12. Describe fission.

13. Describe regeneration and give an example. 

14. Explain the vegetative propagation in plants.

15. Label the male reproductive system.

16. How are the lungs in the human designed so as to maximize the area for the exchange of gases? 

17. Why is it required to separate the oxygenated and deoxygenated blood in humans?

18. What happens at the synapse between two neurons?

19. How does auxin promote the growth of the tendril around a support?

20. How does the body respond when adrenaline is secreted into the blood?

21. Why diabetes patients are given insulin injections.

22. What is the difference between pollination and fertilization?

23. Write the role of the seminal vesicles in the prostate gland. 

24. How do Mendel's experiments show if the traits are dominant or recessive?

25. What factors lead to the rise of the new species?

26. Explain the importance of the fossils and the example.

27. Explain the terms "analogous" and "homologous."

28. Draw the ray diagram for the following conditions for the concave mirror:

a) When object is at C b) When object is between C and F  c) When object is at f

29. Draw the ray diagram for a convex mirror when the object is at infinity.

30. Why do we use a convex mirror as a rearview mirror in vehicles?

31. An object 4 cm in size is placed at 45 cm in front of the concave mirror of focal length 15 cm. At what distance from the concave mirror should a screen be placed in order to obtain a sharp image? Find the nature and size of the image.

32. Practice the image of refraction through a glass slab.

33. What do you mean by refraction? The meaning of the sentence that refractive index of the diamond is 2.42?

Question: Based on the image formation by the convex and concave lens... 

34. An object is kept beyond 2f1, between f1 and O (convex lens)

When an object is at the focus of a concave mirror and the object is at infinity, then show the position of the image by a ray diagram.

35. Explain the term "magnification."

36. One half of the convex lens is covered with a black paper. Will this lens produce a complete image of an object?

37. Magnification produced by a plane mirror is +1. What does it mean? 

38. An object of size 7 cm is placed 27 cm in front of the concave mirror of focal length 18 cm.  At what distance should the mirror be placed to get the sharp and focused image? 

39. Describe the parts of the human eye and their function. Describe myopia, hypermetropia, and presbyopia.

40. How we experience the twinkling of the stars. Discuss the advanced sunrise and delayed sunset.

41. Explain the Tyndall effect.

42. Define the term current.

43. What is 1 Ampere?

44. Find the number of electrons passing through a conductor where current is 1 amp.

45. How much energy is given to each coulomb of charge passing through a 6V battery?

46. Find the equivalent resistance when a 1000000-ohm and a 1-ohm resistor are connected in parallel or in series. 

47. What is the heating effect of electric current?

An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when heating is at the minimum. The voltage is 220 V. What are the current and resistance in each case?

48. Describe the power of an electric circuit. an electric bulb rated 220 W , current was 0.5 amp, Find the power of the bulb.

49. Write the properties of the magnetic field lines. 

50. Explain the right-hand thumb rule. 

51. Describe the magnetic field due to the current in the solenoid.

52. Describe Fleming's left-hand thumb rule.

53  Describe the functioning of an electric DC motor.

54. What is a good source of energy?

55. What is good fuel?

56. Explain the functioning of the hydrowater plant and tidal energy. 

57. Give  two ways in which non-biodegradable substances would affect the environment. 

58. Describe the role of the food chain. 

59. Explain the term water harvesting.

60. Write the importance of coal and petrolium.