CBSE Class 10 Science Important Questions 2023-24

CBSE Class 10 Science Important Questions 2023-24: When going for board exams, students wonder about the CBSE Important Questions for Class 10 Science. If they know the important questions, it becomes easy for them to prepare for the board exams. In this article, students can check the list of questions from different topics of the Science subject. Going through these short and long important questions and preparing them will boost the confidence of students. They will learn to write the best answers according to the marks allotted to the questions. Students will be able to decide the length of answers and if there is a diagram required. They can write the answers accordingly.

Go through the article to know the variety of questions asked from different topics. By attempting these questions, students can prepare for board exams.

Quick Links:

CBSE Class 10 Result 2024	CBSE Class 10 Marksheet 2024
CBSE Class 10 Grading System 2024	CBSE Class 10 Toppers 2024
CBSE Class 10 Date Sheet 2024	CBSE Class 10 Sample Paper 2023-24

CBSE Class 10 Science Important Questions 2023-24: 1 Mark Questions

These are the short questions asked in the board exam for 1 mark. Let us take a look at them.

Question 1 - Unit of electric power may also be expressed as: i) volt-ampere ii) kilowatt-hour iii) watt-second iv) joule-second

Question 2 - Mild non-corrosive basic salt is 

1. a) Ca (OH)2 
2. b) NaCl 
3. c) NaOH 
4. d) NaHCO3

Question 3 - Soaps are formed by alkaline hydrolysis of 

1. a) Carboxylic acids 
2. b) Esters of long chain fatty acids 
3. c) Esters of small chain 
4. d) Inorganic acids

Question 4 - To trace the path of ray of light through the triangular glass prism, a student observes that the emergent ray has 

(a) bent away from the base of the prism 

(b) bent towards the base of the prism 

(c) moved parallel to the direction of incident ray 

(d) gone perpendicular to incident ray.

Question 5 - Mention any one point of difference between Pepsin and Trypsin.

CBSE Class 10 Science Important Questions 2023-24: 2 Mark Questions

Following questions are asked in the board exam for 2 marks. Students can prepare them for the board exams. 

Question 1 - Why is there a need to harness non-conventional sources of energy? Give two main reasons.

Question 2 - Mention about the four events that occur during binary fission in amoeba. 

Question 3 - A student obtained a sharp image of a lighted candle on a screen using a convex lens. Now he wants to focus a distant lamp on a far away electric pole. In which direction should the lens be move for this purpose with respect to the screen, to get a sharp image on the screen? Justify your answer.

Question 4 - How is the mode of action in beating of the heart different from reflex actions? Give four examples.

Question 5 - Dil. HCl is added to Zn granules.” How will you prove that chemical change has taken place here? Support your response with two arguments.

CBSE Class 10 Science Important Questions 2023-24: 3 Mark Questions

The questions given below are asked in CBSE Class 10 Science exam for 3 marks. These are some of the important questions that students should pay attention to.

Question 1 - An element ‘M’ with electronic configuration 2 8 3 combines separately with Cl- , SO4-2 anions. Write the chemical formulae of the compounds formed. Predict with the suitable reason the nature of the bond formed by element ‘M’ in general. How will the electrical conductivity of the compounds formed vary with respect to ‘M’? 

Question 2 - How is lymph an important fluid involved in transportation? If lymphatic vessels get blocked, how would it affect the human body? Elaborate.

Question 3 - Refractive index of water with respect to air is 1.33 and that of diamond is 2.42. 

(i) In which medium does the light move faster, water or diamond? 

(ii) What is the refractive index of diamond with respect to water?

Question 4 - Different species use different strategies to determine sex of a newborn individual. It can be environmental cues or genetically determined‟. Explain the statement by giving example for each strategy.

Question 5 - Suppose your parents have constructed a two room house and you want that in the living room there should be a provision of one electric bulb, one electric fan, a refrigerator and a plug point for appliances of power up to 2 kilowatt. Draw a circuit diagram showing electric fuse and earthing as safety devices.

Quick Link

CBSE Class 10 Social Science Important Questions 2023-24	CBSE Class 10 English Important Questions 2023-24
CBSE Class 10 Math Important Questions 2023-24	CBSE Class 10 Hindi Important Questions 2023-24

CBSE Class 10 Science Important Questions 2023-24: 5 Mark Questions

Following are the important long questions asked from various chapters in Science subject. Check the questions and prepare the answers according to the marks.

Question 1 -

(i) Identify any two parts from the above diagram which carry oxygenated and deoxygenated blood. 

(ii) Explain the process of double circulation with the help of a flow chart.

Question 2 - A. Explain the formation of rainbow in the sky with the help of a diagram. List the three phenomena of light involved. Which colour – violet or red appears at top of the rainbow?

1. What is the difference in colours of the sun observed during sunrise/sunset and noon? Give explanation for each. 

Question 3 - A. Draw a longitudinal section of a flower and label the following parts – 

1. a) Part that develops into a fruit 
2. b) Part that produces pollen grain 
3. c) Part that transfers male gametes 
4. d) Part that is sticky to trap 
5. Name the parts labeled A, B, C, D in the diagram given below:

Question 4 - Trace the changes that take place in a flower from gamete formation to fruit formation.

Question 5 - Given below are certain situations. Analyze and describe its possible impact on a person: 

1. a) Testes of a male boy are not able to descend into scrotum during his embryonic development. 
2. b) Vas deferens of a man is plugged. 
3. c) Prostate and seminal vesicles are not functional. 
4. d) Egg is not fertilised in a human female. 
5. e) Placenta does not attach to the uterus optimally

Also Read: CBSE Class 10 Science Sample Paper

CBSE Class 10 Science Important Questions 2023-24: Chapter-wise Questions

Check out the following questions from different chapters. These questions are asked for long and short answers. 

Question 1 - Which of the given options correctly represents the Parent acid and base of Calcium Carbonate?

Question 2 - Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth? 

1. Convex mirror 
2. Plane mirror 
3. Concave mirror 
4. Any spherical mirror

Question 3 - (i) Four samples A, B, C and D change the colour of pH paper or solution to Green, Reddish-pink, Blue and Orange. Their pH was recorded as 7, 2, 10.5 & 6 respectively. Which of the samples has the highest amount of Hydrogen ion concentration? Arrange the four samples in the decreasing order of their pH. 

(ii) Rahul found that the Plaster of Paris, which he stored in a container, has become very hard and lost its binding nature. What is the reason for this? Also, write a chemical equation to represent the reaction taking place. 

(iii) Give any one use of Plaster of Paris other than for plastering or smoothening of walls.

Question 4 - When a slide is placed 15 cm behind the lens in the projector, an image is formed 3 m in front of the lens. If the focal length of the lens is 14 cm, draw a ray diagram to show image formation. (not to scale)

Question 5 - The table given below shows the hints given by the quiz master in a quiz. S.NO HINT 

(i)	Substance ‘C’ is used as a preservative.
(ii)	‘C’ has two carbon atoms; ‘C’ is obtained by the reaction of ‘A’ in presence of alkaline Potassium permanganate followed by acidification.
(iii)	Misuse of ‘A’ in industries is prevented by adding Methanol, Benzene, and pyridine to ‘A’.
(iv)	‘F’ is formed on heating ‘A’ in presence of conc Sulphuric acid.
(v)	‘F’ reacts with Hydrogen gas in presence of Nickel and Palladium catalyst.

Based on the above hints answer the following questions 

1. a) Give the IUPAC names of A and F 
2. b) Illustrate with the help of chemical equations the changes taking place. (A → C and A → F)

CBSE Class 10 Science Exam Pattern 2024

CBSE Class 10 Science exam will be of 100 marks, out of which, the theory paper will be of 80 marks, and the internal assessment will be of 20 marks. In the Class 10 Science Exam, 50% of the questions would be to check the competency level of students. The questions will be in the form of multiple-choice questions, short or long questions. The table below represents the weightage of questions. 

Type of Questions	Weightage
Competency-Based Questions	50%
Short & Long Answer Type Questions	30%
MCQ Type Questions	20%

CBSE Class 10 Science Exam Pattern 2024

CBSE Class 10 Science exam will be of 100 marks, out of which, the theory paper will be of 80 marks, and the internal assessment will be of 20 marks. In the Class 10 Science Exam, 50% of the questions would be to check the competency level of students. The questions will be in the form of multiple-choice questions, short or long questions. The table below represents the weightage of questions. 

Type of Questions	Weightage
Competency-Based Questions	50%
Short & Long Answer Type Questions	30%
MCQ Type Questions	20%

CBSE Class 10 Science Marks Distribution

The following table includes the topic-wise weightage for each of the units in CBSE Class 10 Science syllabus. Students should follow the marks distribution to check :

Unit	Weightage (in terms of marks)
Unit 1: Chemical Substances-Nature and Behaviour (Chemical Reactions, Acids, Bases and salts, Metals and Non-metals, Carbon Compounds)	6
Unit 2: World of Living (Life Processes, Control and Co-ordination in Animals and Plants, Reproduction, Heredity and Evolution)	20
Unit 3: Natural Phenomena (Reflection of Light, Refraction, Human Eye)	6
Unit 4: Effects of Current (Electricity, Magnetic Effects of Current)	15
Unit 5: Natural Resources (Our Environment)	12
Total Marks	80

By regularly going through the important questions, students can improve their performance levels. Students can also go through the sample papers and CBSE Class 10 Science Previous Year Question Papers to get an idea of the exam pattern. These question papers will introduce students to the variety of questions from all topics in the syllabus. Students can solve them to improve their speed and accuracy too.