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CBSE class 10 science most important questions and answers -Part 1

most important question and answers

CBSE class 10 science most important questions and answers -Part 1

CBSE class 10 science most important questions and answers -Part 1 are created for helping the students to boost their preparations of board exam of CBSE 2020-21. By studying CBSE class 10 science most important questions and answers   pubished by Future Study Point for 2020-21 board exam students will get a complete idea about the type of questions asked in the exam and the way of answering the questions in their answer sheet.

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CBSE class 10 science most important questions and answers -Part 1

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Q1. (i) Why are solar heating devices painted black ?

(ii) Name two such devices and state two limitations of these.


(i). Solar heating devices are painted black because the black colour is the best absorber of heat,like solar cooker and solar cell both are painted black.

(ii).Solar Cooker and Solar cells are two Solar heating devices.

Solar cookar.It is used to convert sun’s radiation into heat energy ,it has following limitations.

(a) The food is cooked in it slowly.

(b) It can not be used at night.

Solar Cell. It is used to convert light energy into electricity,it has the following limitations.

(a).The solar cells can convert only 25 percent of light energy exposed on its surface into electricity.

(b).The solar cells can not work at night.

Q2. Distinguish between renewable and non-renewable sources of energy. Also give an example of each of these sources.


Renewable Source of Energy-The sources of energy that can be replenished easily or could be used forever without worrying about its complete exhaustion from the earth. At present the word’s 10 % of total energy is driven by renewable resources like solar energy, wind energy, geothermal energy, tidal energy, biomass energy.

Non-renewable source of energy. The sources of energy which can not be used forever because these are available in the earth in limited quantity, the formation of these sources required millions of years. Their continued use may lead their complete depletion out of the earth.The examples of Non-renewable resources are fossil fuel like oil, natural gas,coal etc.

Q3.Smita’s father has been advised by a doctor to reduce his sugar intake.

(i) Name the disease he is suffering from and name the hormone whose deficiency causes it.

(ii) Identify the gland that secretes it and mention the function of this hormone.

(iii) Explain how the time and amount of secretion of this hormone is regulated in human system 


(i) Smita’s father is suffering the disease Diabetes mellitus and the hormone whose deficiency causes it is Insulin.

(ii) The gland that secretes insulin is Pancreas and this hormone maintains to keep up the glucose level.

(iii) We get the energy by the breakdown of glucose into carbon dioxide, water, and energy in the form of ATP. The role of insulin is to store glucose into the liver cell. When the insulin secretion is less then it leads hyperglycemia, then, the blood glucose or blood sugar level increases causing Diabetes mellitus. Diabetes means siphon(passes) and Mellitus means sweat. When insulin secretion is less it leads to hypoglycemia.

Q4. In human alimentary canal name the site of the complete digestion of various components of food. Explain the process of digestion.

Answer. Although the digestion of food starts from the mouth, where saliva secreted breaks down carbohydrate and forms food bolus so that it could be swallowed easily

Further, the food transports through the esophagus and reaches to the stomach where the secretion of hydrochloric acid maintains the ph value suitable for the secretion of digestive enzymes (pepsin), which partially digest protein.

This partially digested food enters into the intestine where the enzymes secreted from the pancreas(amylase and trypsin) completely digest carbohydrate into the glucose and protein into amino acids and bile secreted by liver emulsify fat, enzymes secreted from pancreas digest that into fatty acid. Here the molecules of carbohydrate, protein and of fats completely changed chemically and then absorbed by the intestinal villies and enter into the bloodstream. 

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NCERT Solutions of Science and Maths for Class 9,10,11 and 12

NCERT Solutions for class 9 maths

Chapter 1- Number System Chapter 9-Areas of parallelogram and triangles
Chapter 2-Polynomial Chapter 10-Circles
Chapter 3- Coordinate Geometry Chapter 11-Construction
Chapter 4- Linear equations in two variables Chapter 12-Heron’s Formula
Chapter 5- Introduction to Euclid’s Geometry Chapter 13-Surface Areas and Volumes
Chapter 6-Lines and Angles Chapter 14-Statistics
Chapter 7-Triangles Chapter 15-Probability
Chapter 8- Quadrilateral

NCERT Solutions for class 9 science 

Chapter 1-Matter in our surroundings Chapter 9- Force and laws of motion
Chapter 2-Is matter around us pure? Chapter 10- Gravitation
Chapter3- Atoms and Molecules Chapter 11- Work and Energy
Chapter 4-Structure of the Atom Chapter 12- Sound
Chapter 5-Fundamental unit of life Chapter 13-Why do we fall ill ?
Chapter 6- Tissues Chapter 14- Natural Resources
Chapter 7- Diversity in living organism Chapter 15-Improvement in food resources
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NCERT Solutions for class 10 maths

Chapter 1-Real number Chapter 9-Some application of Trigonometry
Chapter 2-Polynomial Chapter 10-Circles
Chapter 3-Linear equations Chapter 11- Construction
Chapter 4- Quadratic equations Chapter 12-Area related to circle
Chapter 5-Arithmetic Progression Chapter 13-Surface areas and Volume
Chapter 6-Triangle Chapter 14-Statistics
Chapter 7- Co-ordinate geometry Chapter 15-Probability
Chapter 8-Trigonometry

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Chapter 1- Chemical reactions and equations Chapter 9- Heredity and Evolution
Chapter 2- Acid, Base and Salt Chapter 10- Light reflection and refraction
Chapter 3- Metals and Non-Metals Chapter 11- Human eye and colorful world
Chapter 4- Carbon and its Compounds Chapter 12- Electricity
Chapter 5-Periodic classification of elements Chapter 13-Magnetic effect of electric current
Chapter 6- Life Process Chapter 14-Sources of Energy
Chapter 7-Control and Coordination Chapter 15-Environment
Chapter 8- How do organisms reproduce? Chapter 16-Management of Natural Resources

NCERT Solutions for class 11 maths

Chapter 1-Sets Chapter 9-Sequences and Series
Chapter 2- Relations and functions Chapter 10- Straight Lines
Chapter 3- Trigonometry Chapter 11-Conic Sections
Chapter 4-Principle of mathematical induction Chapter 12-Introduction to three Dimensional Geometry
Chapter 5-Complex numbers Chapter 13- Limits and Derivatives
Chapter 6- Linear Inequalities Chapter 14-Mathematical Reasoning
Chapter 7- Permutations and Combinations Chapter 15- Statistics
Chapter 8- Binomial Theorem  Chapter 16- Probability

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NCERT solutions for class 12 maths

Chapter 1-Relations and Functions Chapter 9-Differential Equations
Chapter 2-Inverse Trigonometric Functions Chapter 10-Vector Algebra
Chapter 3-Matrices Chapter 11 – Three Dimensional Geometry
Chapter 4-Determinants Chapter 12-Linear Programming
Chapter 5- Continuity and Differentiability Chapter 13-Probability
Chapter 6- Application of Derivation CBSE Class 12- Question paper of maths 2021 with solutions
Chapter 7- Integrals
Chapter 8-Application of Integrals

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