List of top Questions asked in CBSE Compartment Exam Class X

What is photosynthesis? Name the organelle and the organs in which photosynthesis takes place. Where does the oxygen liberated come from during this process? What happens to the carbohydrates which are not immediately used by the plant?
The shape of magnetic field lines produced (i) inside a solenoid (ii) around a straight conductor, both carrying current of the same magnitude are, respectively :
Name the parts in the human female reproductive system where the following functions take place:
(1) Maturation of eggs
(2) Fusion of the egg and the sperm
(3) Implantation of the zygote
The commercial unit of electric energy is commonly known as ‘unit’. Write its actual name and establish the relationship between this unit and the SI unit of energy.
Give the structure and function of alveoli in human respiratory system.
Explain by giving one example each:
(1) Unisexual flowers
(2) Bisexual flowers
List any two methods by which the solid wastes generated in urban areas can be safely disposed off.
Assertion (A) : Each human trait is influenced by both paternal and maternal DNA.
Reason (R) : As compared to the father, the mother contributes more amount of genetic material to the child.
In the electrolysis of water, if the mass of the gas collected at the anode is $m_a$ and the mass of the gas collected at the cathode is $m_c$, the value of $\frac{m_c}{m_a}$ is :

The resistance of a wire does not depend on its :

Absolute refractive indices of water and glass are $\frac{4}{3}$ and $\frac{3}{2}$ respectively. In which one of the two media is the speed of light more?

The absolute refractive indices of water and glass are $\frac{4}{3}$ and $\frac{3}{2}$ respectively. If the speed of light in glass is $2 \times 10^8$ m/s, find the speed of light in (i) water and (ii) vacuum.
“A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.” Draw a labelled ray diagram to justify this statement.
How is the brain protected from shocks and injuries?
Write the main functions of (i) sensory neuron and (ii) motor neuron in a reflex arc.
Which part of the brain is involved in activities like (i) picking a pencil and (ii) vomiting? State whether these actions are voluntary or involuntary.
How does the central nervous system communicate with other parts of the body to carry out various activities? Name two components of this system.
Define the term absolute refractive index of a medium.
If a ray of light enters obliquely from glass to water, will it bend towards the normal or away from the normal?
Define trophic levels. At which trophic level do we find (i) secondary and (ii) tertiary consumers in a food chain? What will happen if all the organisms of a trophic level die? Give reasons to justify your answer.
Define water of crystallisation.

Name the labelled parts A, B, C and D in the diagram given below.

Where is iron placed in the reactivity series of metals? Write the form/forms in which its ores are found in nature.
An organic compound ‘X’ when reacts with sodium liberates hydrogen. The same compound ‘X’ when heated at 443 K in the presence of concentrated sulphuric acid gives an unsaturated hydrocarbon.
(i) Identify ‘X’.
Why are carbon compounds exceptionally stable?