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Important Questions for CBSE (English Medium) Class 10 - CBSE - Science

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Science
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Write the functions of the following parts in human female reproductive system:-

(i) Ovary

(ii) Oviduct

(iii) Uterus

Appears in 15 question papers
Chapter: [0.08] How do Organisms Reproduce?
Concept: Human Reproductive System

Describe the function of placenta.

Appears in 13 question papers
Chapter: [0.08] How do Organisms Reproduce?
Concept: Human Reproductive System

List three distinguishing features, in tabular form, between acquired traits and the inherited traits.

Appears in 13 question papers
Chapter: [0.09] Heredity and Evolution
Concept: Evolution

Write the function of the following part of the human eye: Cornea

Appears in 13 question papers
Chapter: [0.11] The Human Eye and the Colourful World
Concept: Human Eye: Structure of the Eye

Write the function of the following part of the human eye: crystalline lens

Appears in 13 question papers
Chapter: [0.11] The Human Eye and the Colourful World
Concept: Human Eye: Structure of the Eye

Write the function of the following part of the human eye: ciliary muscles

Appears in 12 question papers
Chapter: [0.11] The Human Eye and the Colourful World
Concept: Human Eye: Structure of the Eye

Draw the well-labelled diagram of the human excretory system

Appears in 11 question papers
Chapter: [0.06] Life Processes
Concept: Excretion: Substances to Be Eliminated

What is atmospheric refraction? Use this phenomenon to explain the following natural events:

Twinkling of stars

Draw diagrams to illustrate your answers.

Appears in 11 question papers
Chapter: [0.11] The Human Eye and the Colourful World
Concept: Atmospheric Refraction

List any four methods of contraception used by humans. State in brief two advantages of adopting such preventive methods.

Appears in 10 question papers
Chapter: [0.08] How do Organisms Reproduce?
Concept: Human Reproductive System

Explain how the embryo gets nourishment inside the mother’s body.

Appears in 10 question papers
Chapter: [0.08] How do Organisms Reproduce?
Concept: Human Reproductive System

A student in viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes (in proper sequence)

Appears in 10 question papers
Chapter: [0.08] How do Organisms Reproduce?
Concept: Asexual Reproduction in Plant

What is meant by a power of a lens? Define its SI unit. 

Appears in 10 question papers
Chapter: [0.1] Light - Reflection and Refraction
Concept: Power of a Lens

Principle of Electric motor

Appears in 10 question papers
Chapter: [0.13] Magnetic Effects of Electric Current
Concept: Electric Motor

Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity

Appears in 9 question papers
Chapter: [0.01] Chemical Reactions and Equations
Concept: Types of Chemical Change or Chemical Reaction > Decomposition Reactions

2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.

Appears in 9 question papers
Chapter: [0.01] Chemical Reactions and Equations
Concept: Chemical Equation

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.

Appears in 9 question papers
Chapter: [0.01] Chemical Reactions and Equations
Concept: Types of Chemical Change or Chemical Reaction > Double Displacement Reaction

The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.

Appears in 9 question papers
Chapter: [0.02] Acids, Bases and Salts
Concept: Salts

 Why are most carbon compounds poor conductors of electricity?

Appears in 9 question papers
Chapter: [0.03] Metals and Non Metals
Concept: The Covalent Bond

Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.

Appears in 9 question papers
Chapter: [0.03] Metals and Non Metals
Concept: Extraction of Metals

How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.

Appears in 9 question papers
Chapter: [0.03] Metals and Non Metals
Concept: Extraction of Metals
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