# CBSE Class 10 Science Extra Questions

We have provided extra questions based on class 10 science. These questions are helpful for developing the problem solving skills. Practicing these questions will help you to score better in your exams.

• ## NUMERICALS BASED ON CONVEX AND CONCAVE LENS

Download free printable assignments and worksheets of class 10 Science. Free PDF Download- Best collection of notes, important questions , sample papers and NCERT Solution for CBSE Class 10 Science. Below you will find the home work assignment for CBSE Class 10 Light- Reflection and Refraction. Problems on convex lens: Q.1. A convex lens of … Continue reading NUMERICALS BASED ON CONVEX AND CONCAVE LENS

• ## Numerical on Refraction of Light for CBSE Class 10

Q.1. Light travels through water with a speed of 2.25 x 108 m/s. What is the refractive index of water? Q.2. Light travels from rarer medium 1 to a denser medium 2. The angle of incident and refraction are respectively 450 and 300. Calculate the (i) refractive index of second medium with respect to the … Continue reading Numerical on Refraction of Light for CBSE Class 10

• ## Numerical on Power of a Lens for CBSE Class 10

Q.1. A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. Calculate the power of the lens. Q.2. A convex lens is of focal length 10 cm. What is its power? Q.3. A person having a myopia eye uses a concave lens of focal length … Continue reading Numerical on Power of a Lens for CBSE Class 10

• ## CBSE CLASS 10 SCIENCE ELECTRICITY QUESTIONS

Q.1. How do we express electric current? Q.2. What is an electric circuit? Q.3. What does a switch do? Q.4. Conventionally, in an electric circuit the direction of electric current is taken as opposite to the direction of the flow of electrons, which are negative charges. Why? Q.5. What is the SI unit of electric … Continue reading CBSE CLASS 10 SCIENCE ELECTRICITY QUESTIONS

• ## NUMERICALS BASED ON ELECTRICITY

Q.1. What will be the current drawn by an electric bulb of 40 W when it is connected to a source of 220V? Q.2. A bulb is rated as 250V; 0.4A. Find its power and resistance. Q.3. An electric bulb is connected to a 220V power supply line. If the bulb draw a current of … Continue reading NUMERICALS BASED ON ELECTRICITY

• ## Extra Questions For Class 10 Science Chapter 10 Reflection and Refraction of Light

Extra Questions On Reflection and Refraction of Light Reflection is the bouncing back of light when it strikes on a polished surface like mirror. Laws of Reflection: (1) Angle of incidence is equal to the angle of reflection.(2) The incident ray, the reflected ray and the normal at the point of incidence, all lie in … Continue reading Extra Questions For Class 10 Science Chapter 10 Reflection and Refraction of Light

• ## Extra Questions For Class 10 Science Chapter 1 Chemical Reactions and Equations

Extra Questions On Class 10 Science Chemical Reactions and Equations Q.1. In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode? Answer Answer: It is because water contains hydrogen and oxygen in the ratio of 2 : 1. Q.2. Balance the following … Continue reading Extra Questions For Class 10 Science Chapter 1 Chemical Reactions and Equations

• ## Numericals based on Resistivity

Q.1. Calculate the resistance of a copper wire of length 2m and area of cross section 10-6 m². Resistivity of copper is 1.7 x 10-8 Ωm Q.2. A copper wire of length 2m and area of cross section 1.7 x 10-6 m2 has a resistance of 2 x 10-2 ohms. Calculate the resistivity of copper. … Continue reading Numericals based on Resistivity

• ## Problems based on combination of resistance

Q.1. For the circuit shown in below Figure, determine (a) the battery voltage V, (b) the total resistance of the circuit, and (c) the values of resistance of resistors R1, R2 and R3, given that the p.d’s across R1, R2 and R3 are 5 V, 2 V and 6 V respectively. Q.2. For the circuit … Continue reading Problems based on combination of resistance

• ## Extra Questions for Class 10 Science Chapter 2 Acids, Bases and Salts

Extra Questions On Class 10 Science Chapter 2 Acids, Bases and Salts Q.1. The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste? Answer Answer. The taste will be slightly sour as it is weakly acidic. Q.2. Which bases are called alkalies? Give an example … Continue reading Extra Questions for Class 10 Science Chapter 2 Acids, Bases and Salts

• ## Extra Questions for Class 10 Science Chapter 13 Magnetic Effect of Electric Current

Q.1. Name the type of current: (a) used in household supply. (b) given by a cell.Answer. (a) Alternating current. (b) Direct current. Q.2. State the observation made by Oersted on the basis of his experiment with current carryingconductors.Answer. The electric current passing through a conducting wire produces magnetic effect. Q.3. How will you determine the … Continue reading Extra Questions for Class 10 Science Chapter 13 Magnetic Effect of Electric Current

• ## Extra Questions for Class 10 Science Chapter 12 Electricity

Extra Questions for Class 10 Science Chapter 12 Electricity Q.1. Name a device that helps to maintain a potential difference across a conductor.Answer. Cell or battery Q.2. Define 1 volt. Express it in terms of SI unit of work and charge calculate the amount of energy consumed in carrying a charge of 1 coulomb through … Continue reading Extra Questions for Class 10 Science Chapter 12 Electricity

• ## Numerical Problems on Electric Power and Energy

Here we are providing numerical problems based on electrical power and energy. These problems are useful for students studying in class 10. Practice these questions to master these topics. Class 10 Numerical Problems Useful for Class 10 Students Topics Covered Electric Power and Energy No. of Questions 70 Type MCQ Numerical Problems on Electric Power … Continue reading Numerical Problems on Electric Power and Energy

• ## Extra Questions for Class 10 Science Chapter 6 Life Processes

Extra Questions Based On Nutrition: Q.1. State the photosynthetic reaction and where does it occur? Answer: The process of photosynthesis occurs in green parts of a plant, basically leaves. The presence of chlorophyll (green pigment) is necessary for photosynthesis to occur and chlorophyll is present in leaves as green dots. The process of the photosynthetic … Continue reading Extra Questions for Class 10 Science Chapter 6 Life Processes

• ## Extra Questions for Class 10 Science Chapter 7 Control And Coordination

Extra Questions for Class 10 Science Chapter 7 Control And Coordination Q.1. Define reflex action. Answer: A reflex action or also known as reflex is the sudden action given in response to any activity. These are the involuntary movement. Reflex action does not involve the conscious part of the brain. The path of impulses in … Continue reading Extra Questions for Class 10 Science Chapter 7 Control And Coordination

• ## Extra Questions for Class 10 Science Chapter 5 Periodic Classification of Elements

Extra Questions for Class 10 Science Chapter 5 Periodic Classification of Elements Q.1. On what basis Mendeleev classify the elements? Answer: Mendeleev classified the elements on the basis of their fundamental property, i.e. atomic mass and chemical properties. He reacted the elements with hydrogen and oxygen and formulaeof the hydrides and oxides of the elements … Continue reading Extra Questions for Class 10 Science Chapter 5 Periodic Classification of Elements

• ## Extra Questions for Class 10 Science Chapter 8 How Do Organisms Reproduce

Extra Questions for Class 10 Science Chapter 8 How Do Organisms Reproduce Q.1. Give one advantage of the asexual mode of reproduction. Answer: Asexual mode of reproduction occurs very fast as it include processes like budding, fission, etc. While the sexual mode is very slow. Clones can be produced by asexual mode of reproduction but … Continue reading Extra Questions for Class 10 Science Chapter 8 How Do Organisms Reproduce

• ## Extra Questions for Class 10 Science Chapter 9 Heredity and Evolution

Q.1. Name the plant Mendel selected for his experiments on genetics.Answer: The plant selected by Mendel for his experiments on Genetics was Pisum sativum. The common name for this plant is sweet pea. Q.2. State the unit of hereditary material found in all living organisms.Answer: The unit of hereditary material found in all living organisms … Continue reading Extra Questions for Class 10 Science Chapter 9 Heredity and Evolution

• ## Extra Questions for Class 10 Science Chapter 11 Human Eye and Colourful World

Q.1. The sky appears dark instead of blue to an astronaut. State its reason. Answer. The sky appears dark to the astronaut as scattering does not take place at very high altitude due to the absence of atmosphere. Q.2. Which phenomenon is responsible for making the path of light visible? Answer. Tyndall effect. Q.3. State … Continue reading Extra Questions for Class 10 Science Chapter 11 Human Eye and Colourful World

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