CBSE 10 Science Question Paper- 2025 Set-1

The correct balanced chemical equation showing exothermic reaction in which natural gas burns in air is:

The warning sign shown in the given figure must invariably be displayed/pasted on the containers which contain hydroxide of:

The body of human beings works within the pH range of:

Aluminium powder is used in thermit welding because:

Two metals zinc and tin are dissolved separately in definite proportions in molten copper (the primary metal) to obtain two different alloys respectively known as:

The opening and closing of stomata is regulated by:

One-cell thick blood vessels are known as:

When chhui-mui (sensitive) plant is touched, its leaves fold. This is due to:

Bryophyllum produces new plant through:

The number of chromosomes in a cell division is halved. This kind of cell division is observed in:

If the absolute refractive indices of two media X and Y are 6/5 and 4/3 respectively, then the refractive index of Y with respect to X will be:

An object is placed at a distance of 30 cm from the pole of a concave mirror. If its real and inverted image is formed at 60 cm in front of the mirror, the focal length of the mirror is:

In the given figure the angle of incidence and the angle of deviation respectively are:

An electric bulb is connected to a power supply of 220 V. If the current drawn by the bulb from the supply is 500 mA, the power of the bulb is:

If three resistors of 12 Ω each are connected in series to form a square ABCD, what is the resistance between points 1 and 2?

Identify from the following a group containing all non-biodegradable substances.

The metals high up in the reactivity series cannot be obtained from their compounds by heating with carbon. This is because:

A mango seed will germinate to form a mango tree because:

In a concave mirror, the image formed by an object is real and inverted. The image is formed at twice the focal length of the mirror. What is the position of the object?

An electric current passes through a conductor and creates a magnetic field around it. The direction of the magnetic field lines can be determined by:

The work done in moving a charge in a circuit is called:

The unit of electric power is:

Which of the following substances is used as an electrode in electrolysis?

The first law of thermodynamics states that energy can neither be created nor destroyed. It can only be:

The total resistance in a series circuit is equal to the sum of the individual resistances. If three resistors of 2 Ω, 4 Ω, and 6 Ω are connected in series, the total resistance will be:

If a magnetic field is applied perpendicular to the motion of an electron, it will experience a force. The direction of this force can be determined by: