List of top Science Questions asked in CBSE Class X

Name the acid present in ant’s sting.
Give any two uses of it.
Write the chemical equation of its preparation.
Give the chemical name and formula of Plaster of Paris.
What happens when Calcium carbonate is heated? Silver bromide is exposed to sunlight? Lead is added to copper chloride solution? Write balanced chemical equations of the reactions involved in support of your answer.
Assertion : Reaction of quick lime with water is an exothermic reaction. Reason (R): A large amount of heat is evolved on the reaction of quick lime and water.
On reaction with dilute HCl, which of the following pair of metals will evolve hydrogen gas?
Which of the following will not undergo addition reaction?
Study the following table and select the correct option:
The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

In the following diagram, if acetic acid of same concentration is taken in place of dilute sulphuric acid, then

Which of the following is an amphoteric oxide?
Which of the following set of compounds does not belong to same homologous series?
Define germination.
State the changes taking place in the following structures of flower post fertilization: Zygote Ovule Ovary Sepals
Why regeneration is not possible in all the types of animals?
Besides sugarcane, give two more examples of plants that reproduce by this method.
List any two advantages of this method.
Sugarcane does not produce seeds so name the process through which it will be able to reproduce.
State two similarities between lungs and kidneys.
What is excretion? Why is it necessary for any living organism?
Write the structure and function of Bowman’s capsule.
Write the structure and function of Bowman’s capsule.
Write two responses that enable the human body to be ready to deal with such situation.
Paddy fields require a large amount of water. The pesticides and chemical fertilizers used are washed down into the soil or waterbodies. How do these chemicals reach our bodies? What is this phenomenon known as?