List of top Questions asked in CBSE Class X

The sum of two numbers is 18, and the sum of their reciprocals is $\frac{1}{4}$. Find the numbers.
The vertices of a quadrilateral ABCD are A(6, – 2), B(9, 2), C(5, – 1) and D(2, – 5). Prove that ABCD is a rhombus, and not a square.
$ABCD$ is a trapezium with $AB \parallel DC$. $AC$ and $BD$ intersect at $E$. If $\triangle AED \sim \triangle BEC$, then prove that $AD = BC$.
The sum of the first three terms of an AP is 30 and the sum of the last three terms is 36. If the first term is 9, then the number of terms is :
Write down the difference between sight alignment and sight picture.
The roots of the quadratic equation \(x^2 + x – p (p + 1) = 0 \)are :
Assertion (A): The area of canvas cloth required to just cover a heap of rice in the form of a cone of diameter 14 m and height 24 m is $175\pi$ sq.m.
Reason (R): The curved surface area of a cone of radius $r$ and slant height $l$ is $\pi r l$.
Name and explain any two problems related to sustainable development.
Calculate the mean of the following data :
Class :4 – 67 – 910 – 1213 – 15
Frequency :54910
The sum of the first three terms of an AP is 30 and the sum of the last three terms is 36. If the first term is 9, then the number of terms is :
Describe the role of manufacturing industries in the economic development of a country.
Analyse the positive outcomes of the democracy.
How did the ideology of 'liberalism' affect the Europe in early nineteenth century? Explain.
“The ocean waters contain vast quantities of minerals.” Explain the statement with an example.
Describe any three features of cultivation of millets in India.
(i) Two magnetic field lines do not intersect each other. Why?
(ii) How is a uniform magnetic field in a given region represented?
Draw a diagram in support of your answer.
Describe the activities undertaken by a producer before production.
Assertion (A): Green plants trap only 1% of the energy of sunlight that falls on their leaves. Reason (R): All green plants are the producers in a food chain.
Write the name and formula of
(1) an acidic salt and
(2) a basic salt giving the name of the parent acid and parent base used to form the salt in each case.
The pH of an aqueous solution of a salt is 9. The types of acid and base from which this salt is formed are:
Typically, what is the useful life of consumer electronics?
The resistance of a metallic wire of 100 m is 20 \(\Omega\). If the radius of the wire is 5 mm, find the resistivity of the metal of the wire.
Explain any two Health related components and any two skill related
Prepare a lesson plan for free play activity.
(A) (i) Name three techniques/devices used by human females to avoid pregnancy. Mention the side effects caused by each.
(ii) What will happen if in a human female (a) fertilisation takes place, (b) an egg is not fertilised?

OR

(B) (i) Draw a diagram showing spore formation in Rhizopus and label the (a) reproductive and (b) non-reproductive parts. Why does Rhizopus not multiply on a dry slice of bread?
(ii) Name and explain the process by which reproduction takes place in Hydra.