CBSE Class 10 Science Question Paper 2026 Available- Download PDF with Solutions

1.

What happens when butane is burnt in air? Write the chemical equation for the reaction. Differentiate between the flames obtained when butane and butyne both are burnt in air in similar conditions.

2.

Define a precipitation reaction. Give its example and also express the reaction that occurs in the form of a balanced chemical equation.

3.

Write chemical equations to show what happens when an acid reacts with a:
Write chemical equations to show what happens when an acid reacts with a:
(i) Metal
(ii) Base
(iii) Carbonate
Write the name of the main product formed in each case

4.

In a bisexual flower the male gametes are present in the :

• anther
• ovary
• stigma
• filament

5.

Explain the mechanism of inheritance used by sexually reproducing organisms to ensure the stability of DNA of the species. 

6.

The water of crystallization is present in:
(i) Bleaching Powder
(ii) Plaster of Paris
(iii) Washing Soda
(iv) Baking Soda

• (ii) and (iv)
• (ii) and (iii)
• (i) and (iii)
• (i) and (iv)

7.

Consider the following food chain:
Grass \( \rightarrow \) Grasshopper \( \rightarrow \) Frog \( \rightarrow \) Snake \( \rightarrow \) Eagle
If the amount of energy available at third trophic level is 50 kJ, the available energy at the producer level was:

• 0.5 kJ
• 5 kJ
• 500 kJ
• 5000 kJ

8.

The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is:

• Blue
• Pale green
• Yellow
• Reddish brown

9.

You have three aqueous solutions A, B and C as given below:
A - Potassium nitrate
B - Ammonium chloride
C - Sodium carbonate
The ascending order of the pH of these solutions is:

• \( A<B<C \)
• \( B<C<A \)
• \( C<A<B \)
• \( B<A<C \)

10.

When a pure-tall pea plant is crossed with a pure-dwarf pea plant, the percentage of tall pea plants in F1 and F2 generation pea plants will be respectively:

• 100%; 25%
  
• 100%; 50%
  
• 100%; 75%
  
• 100%; 100%
  

11.

Give two methods used to grow rose and jasmine plants by vegetative propagation.

12.

(i) Study the diagram and name the parts marked as A, B, C, and D. 
(ii) Write the function of A and C.

 

13.

Leaves of the sensitive plant move very quickly in response to ‘touch’. How is this stimulus of touch communicated and explain how the movement takes place? 

14.

Identify from the following the ray diagram which shows the correct path of the reflected ray for the ray incident on a concave mirror as shown:

15.

A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The \( F_1 \) generation will be:

• 25% tall with round seeds
• 50% tall with wrinkled seeds
• 75% tall with wrinkled seeds
• 100% tall with round seeds