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

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Science
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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: [0.03] Metals and Non Metals
Concept: Physical Properties of Metals

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: [0.04] Carbon and its Compounds
Concept: Saturated and Unsaturated Carbon Compounds

 Why are most carbon compounds poor conductors of electricity?

Appears in 9 question papers
Chapter: [0.04] Carbon and its Compounds
Concept: The Covalent Bond

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: [0.05] Periodic Classification of Elements
Concept: 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: [0.05] Periodic Classification of Elements
Concept: The Modern Periodic Table

Mention any two components of blood.

Appears in 9 question papers
Chapter: [0.06] Life Processes
Concept: Respiration

Trace the movement of oxygenated blood in the body.

Appears in 9 question papers
Chapter: [0.06] Life Processes
Concept: Respiration

Write the function of valves present in between atria and ventricles.

Appears in 9 question papers
Chapter: [0.06] Life Processes
Concept: Blood Vessels – Arteries, Veins, and Capillaries

Write one structural difference between the composition of arteries and veins.

Appears in 9 question papers
Chapter: [0.06] Life Processes
Concept: Blood Vessels – Arteries, Veins, and Capillaries

Define excretion

Appears in 9 question papers
Chapter: [0.06] Life Processes
Concept: Excretion: Substances to Be Eliminated

Name the basic filtration unit present in the kidney.

Appears in 9 question papers
Chapter: [0.06] Life Processes
Concept: Excretion: Substances to Be Eliminated

List the steps of preparation of temporary mount of a leaf peel to observe stomata.

Appears in 9 question papers
Chapter: [0.06] Life Processes
Concept: Mode of Nutrition in Plant > Autotrophic Nutrition

Name one gustatory receptor and one olfactory receptor present in human beings.

Appears in 9 question papers
Chapter: [0.07] Control and Co-ordination
Concept: Reflex and Reflex Action

Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.

Appears in 9 question papers
Chapter: [0.07] Control and Co-ordination
Concept: Human Nervous System

Name the hormones secreted by the given endocrine glands and specify one function.

Thyroid

Appears in 9 question papers
Chapter: [0.07] Control and Co-ordination
Concept: Hormones in Animals

Name the hormones secreted by the given endocrine glands and specify one function.

Pituitary

Appears in 9 question papers
Chapter: [0.07] Control and Co-ordination
Concept: Hormones in Animals

Name the hormones secreted by the given endocrine glands and specify one function.

Pancreas

Appears in 9 question papers
Chapter: [0.07] Control and Co-ordination
Concept: Hormones in Animals

Answer the following question.
What is pollination? Explain the different types of pollination.

Appears in 9 question papers
Chapter: [0.08] How do Organisms Reproduce?
Concept: Sexual Reproduction in Flowering Plants

Name the process by which an Amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

Appears in 9 question papers
Chapter: [0.08] How do Organisms Reproduce?
Concept: Asexual Reproduction > Asexual Reproduction in Plant

A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny?

Appears in 9 question papers
Chapter: [0.09] Heredity and Evolution
Concept: Heredity
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