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Important Questions for CBSE Class 10 - CBSE - 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: [2.02] Reproduction
Concept: Reproduction in Human Beings

Describe the function of placenta.

Appears in 13 question papers
Chapter: [2.02] Reproduction
Concept: Reproduction in Human Beings

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

Appears in 13 question papers
Chapter: [3] Natural Phenomena
Concept: Concept of Human Eye

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

Appears in 13 question papers
Chapter: [3] Natural Phenomena
Concept: Concept of Human Eye

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

Appears in 12 question papers
Chapter: [3] Natural Phenomena
Concept: Concept of Human Eye

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

Appears in 11 question papers
Chapter: [2.01] Heredity and Evolution
Concept: Evolution - Acquired and Inherited Traits

Draw the well-labelled diagram of the human excretory system

Appears in 11 question papers
Chapter: [2.04] Life Processes
Concept: Concept of Excretion

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: [3] Natural Phenomena
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: [2.02] Reproduction
Concept: Reproduction in Human Beings

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

Appears in 10 question papers
Chapter: [2.02] Reproduction
Concept: Reproduction in Human Beings

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: [2.02] Reproduction
Concept: Reproduction > Modes of Reproduction Used by Single Organisms - Budding

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

Appears in 10 question papers
Chapter: [3] Natural Phenomena
Concept: Refraction at Spherical Surfaces and by Lenses > Power of a Lens

Principle of Electric motor

Appears in 10 question papers
Chapter: [4.01] Magnetic Effects of Current
Concept: Electric Motor

A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.

Appears in 9 question papers
Chapter: [1.01] Carbon Compounds
Concept: Versatile Nature of Carbon - Saturated and Unsaturated Carbon Compounds

 Why are most carbon compounds poor conductors of electricity?

Appears in 9 question papers
Chapter: [1.01] Carbon Compounds
Concept: Bonding in Carbon - 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: [1.02] Metals and Non Metals
Concept: Occurrence of Metals > 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: [1.02] Metals and Non Metals
Concept: Occurrence of Metals > Extraction of Metals

A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.

Appears in 9 question papers
Chapter: [1.02] Metals and Non Metals
Concept: Metals and Nonmetals > Chemical Properties of Metals - Reactivity Series

The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.

Appears in 9 question papers
Chapter: [1.03] Periodic Classification of Elements
Concept: Early Attempts at the Classification of Elements - Dobereiner’s Triads

Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.

Appears in 9 question papers
Chapter: [1.03] Periodic Classification of Elements
Concept: The Modern Periodic Table
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