CBSE 10 Science Question Paper-2025 Set-2

Electrolysis of water is a decomposition reaction. The mass ratio (MH : MO) of hydrogen and oxygen gases liberated at the electrodes during electrolysis of water is :

The products formed when Aluminium and Magnesium are burnt in the presence of air respectively are :

The following table shows the pH values of four solutions A, B, C and D on a pH scale. The solutions A, B, C and D respectively are of a :

The products formed when Dilute hydrochloric acid reacts with sodium hydroxide are:

Reaction between two elements A and B, forms a compound C. A loses electrons and B gains electrons. Which one of the following properties will not be shown by compound C?

The metals obtained from their molten chlorides by the process of electrolytic reduction are :

The formation of magnesium oxide is correctly shown in option :

Secretion of less saliva in mouth will affect the conversion of:

The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is :

The correct/true statement(s) for a bisexual flower is/are :

If pea plants with round and green seeds (RRyy) are crossed with pea plants having wrinkled and yellow seeds (rrYY), the seeds developed by the plants of F1 generation will be :

The breakdown of glucose has taken the following pathway : Glucose ⎯⎯⎯→ Pyruvate + Energy. The sites ‘a’ and ‘b’ respectively are :

Mirror ‘X’ is used to concentrate sunlight in solar furnace and Mirror ‘Y’ is fitted on the side of the vehicle to see the traffic behind the driver. Which of the following statements are true for the two mirrors ?

An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is ‘a’ which can be corrected by lens ‘b’, then ‘a’ and ‘b’ respectively are :

Which of the following groups do not constitute a food chain ?

The percentage of solar energy which is not converted into food energy by the leaves of green plants in a terrestrial ecosystem is about :

Assertion (A): Decomposition reactions are generally endothermic reactions. Reason (R): Decomposition of organic matter into compost is an exothermic process.

Assertion (A): Human civilization shows several hereditary traits. Reason (R): Human civilization has many basic traits inherited from their mothers.

Assertion (A): No two magnetic field lines are found to cross each other. Reason (R): The compass needle cannot point towards two directions at the point of intersection of two magnetic field lines.

Assertion (A): The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R): The oxygen atoms combine with molecular oxygen to form ozone.

A student performs the following experiment in his school laboratory. List two observations to justify that in this experiment a chemical change has taken place.

Draw labelled diagrams to show different stages of budding in Hydra.

Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel? Name the component of blood which helps in this process and state how this component performs this function.

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm. Use lens formula to find the position of the image formed in this case.

A wire of resistance R is cut into three equal parts. If these three parts are then joined in parallel, calculate the total resistance of the combination so formed.

Define electric power. When do we say that the power consumed in an electric circuit is 1 watt?

Displacement reactions also play a key role in extracting metals in the middle of the reactivity series. Justify this statement with two examples.

With the help of an activity, explain the conditions under which iron articles get rusted.

What are chromosomes? Explain in brief how the stability of DNA content of a species is ensured in sexually reproducing organisms.

What is the function of the earth wire in electrical circuits? State the advantage of the earth wire in domestic electric appliances such as electric iron.