List of top Questions asked in CBSE Class X- 2024

Give reason for this: Fine hair and mucus are present in the nasal passage.

Read the following excerpt from a newspaper on the problem of car parking and its impact.
A survey conducted on the residents showed that car parking in colonies has risen due to an increase in the number of cars per family. This has resulted in ugly incidents of road rage. Most of the families revealed that they are facing multiple issues due to this situation. There is no place for visitors to park and residents themselves park their cars haphazardly. In addition there is an increase in commercial vehicles parked outside colony gates, thus blocking exits.
Write a paragraph in about 120 words to analyze the news clipping.

How did the ideology of 'liberalism' affect the Europe in early nineteenth century? Explain.

It is our attitude towards a situation that makes it positive or negative. Do you agree with it? Express your views with reference to the poem, ‘Dust of Snow’.

When 2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as:

Select from the following a decomposition reaction in which the source of energy for decomposition is light:

A metal and a non-metal that exists in liquid state at the room temperature are respectively :

Carbon compounds :
(i) are good conductors of electricity.
(ii) are bad conductors of electricity.
(iii) have strong forces of attraction between their molecules.
(iv) have weak forces of attraction between their molecules.
The correct statements are :

Consider the following compounds:
FeSO₄ ; CuSO₄ ; CaSO₄ ; Na₂CO₃
The compound having the maximum number of water of crystallisation in its crystalline form in one molecule is:

Oxides of aluminium and zinc are :

MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂
The reaction given above is a redox reaction because in this case:

Consider the following statements:
(i) The sex of a child is determined by what it inherits from the mother.
(ii) The sex of a child is determined by what it inherits from the father.
(iii) The probability of having a male child is more than that of a female child.
(iv) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote.
The correct statements are:

Chromosomes:
(i) carry hereditary information from parents to the next generation.
(ii) are thread like structures located inside the nucleus of an animal cell.
(iii) always exist in pairs in human reproductive cells.
(iv) are involved in the process of cell division.
The correct statements are:

In a nerve cell, the site where the electrical impulse is transmitted to the next neuron is called:

A stomata closes when :
(i) it needs carbon dioxide for photosynthesis.
(ii) it does not need carbon dioxide for photosynthesis.
(iii) water flows out of the guard cells.
(iv) water flows into the guard cells.
The correct reason(s) in this process is/are :

At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen ?

The lens system of human eye forms an image on a light sensitive screen, which is called as :

The pattern of the magnetic field produced inside a current carrying solenoid is :

Identify the food chain in which the organisms of the second trophic level are missing :

In which of the following organisms, multiple fission is a means of asexual reproduction ?

Assertion (A) : Hydrogen gas is not evolved when zinc reacts with nitric acid.
Reason (R) : Nitric acid oxidises the hydrogen gas produced to water and itself gets reduced.

Assertion (A): Accumulation of harmful chemicals is maximum in the organisms at the highest trophic level of a food chain.
Reason (R) : Harmful chemicals are sprayed on the crops to protect them from diseases and pests.

Assertion (A): The rate of breathing in aquatic organisms is much faster than in terrestrial organisms.
Reason (R) :The amount of oxygen dissolved in water is very high as compared to the amount of oxygen in air.

Assertion (A): The rainbow is a natural spectrum of sunlight in the sky.
Reason (R) : Rainbow is formed in the sky when the sun is overhead and water droplets are also present in air.

Name the type of chemical reaction in which calcium oxide reacts with water. Justify your answer by giving balanced chemical equation for the chemical reaction.