10th Science Important 7 Mark Questions

Secure the maximum weightage section of your board exam with our curated collection of 10th Science Important 7 Marks questions. As the longest descriptive part of the science paper, the 7-mark section demands a comprehensive understanding of complex mechanisms, structured sub-questions, chemical properties, and detailed, well-labeled biological diagrams. This guide brings together the most frequently repeated essay-type questions and compulsory problems across Physics, Chemistry, and Biology, providing you with the exact presentation strategies and point-by-point breakdowns needed to secure a perfect score.

X SCIENCE

IMPORTANT - SEVEN MARKS QUESTIONS

1. A.
i) An Object AB is placed at the centre of curvature C of the convex lens as shown in the picture. Complete the ray diagram.
ii) A Student in a class room can read text book but he/she can't able to see the letters on the black board distinctly. Write the name of his/her eye defect and what is the cause? Suggest a remedy.
iii) ₉₂U²³⁵ experiences one α decay. Find the number of neutrons in the final daughter nucleus that is formed.

2.
i) What is meant by electric current?
ii) Define the unit of electric current.
iii) Which instrument is used to measure the electric current? How should it be connected in a circuit?
iv) List any two merits of LED bulb.

3.
i) The electronic configuration of metal A is 2, 8, 18, 1. Metal A when exposed to air and moisture forms a green coloured compound B. A reacts with con. H₂SO₄ to forms compounds C and D along with water. D is a gaseous compound. Identify A, B, C and D.
ii) The molecular formula of an alcohol is C₄H₁₀O. The locant number of its -OH group is 2. From these details:
(a) Draw its structural formula.
(b) Write its IUPAC name.
(c) Write whether it is a saturated compound or an unsaturated compound?

4.
i) Define respiratory quotient.
ii) What is cohesion?
iii) What are the effects of hybrid vigour in animals?

5.
i) What is 3R approach?
ii) Fill in the blanks:
a. In DNA replication, the enzyme that separates the two strands of DNA is _______
b. Enzyme that removes the twists formed during the unwinding process of DNA is _______
c. Nucleotides are added with the help of an enzyme called _______
d. The DNA fragments are joined together by the enzyme _______
e. The replication stops when the replication fork of the two sides meet at the site called _______

6. A.
i) Shock absorbers are used in luxury buses. Why?
ii) A weight of a man is 686 N on the surface of the earth. Calculate the weight of the same person on moon. ('g' value of a moon is 1.625 m s^-2)
iii) Name the law of motion used in flying of birds. Give another example for the same law.

7.
i) A source producing a sound of frequency 500 Hz, is moving towards a static listener with a velocity of 30 m s^-1. The speed of the sound is 330 m s^-1. What will be the frequency heard by listener?
ii) Write any four medical applications of radioactivity.

8.
i) Arun was playing in the garden. Suddenly he saw a dragon fly sitting on a plant. He observed the wings of it. He thought it looked similar to the wing of a crow. Is he correct? Give reason for your answer.
ii) Although coal and petroleum are produced by degradation of biomass, yet we need to conserve them. Why?

9. A.
i) Calculate the mass percentage of each element present in calcium carbonate molecule. (Mass number: C - 12, O - 16, Ca - 40)
ii) In what way hygroscopic substances differ from deliquescent substances? Write three differentiating points.

10.
i) What are the types of inertia? Explain any one of them with an example.
ii) List the advantages of Telescopes.

11.
i) Give any three differences between the sound and light waves.
ii) Draw the picture of seven segment display for any one alpha numeric number.

12.
i) Metal A belongs to 3rd period and 13th group in the modern periodic table of elements. A reacts with steam in red hot condition to form compound B. A also reacts with strong alkali (NaOH) to form compound C. Find A, B and C. Write appropriate balanced chemical equations.
ii) How detergents cause water pollution?

13.
i) Transpiration is a necessary evil in plants. Explain.
ii) Describe the types of neuron on the basis of their functions.

14.
i) Write any two physiological effects of ethylene.
ii) How will you prevent soil erosion?

15. A. Describe rocket propulsion.

16.
i) With the help of a circuit diagram derive the formula for the resultant resistance of three resistors in parallel?
ii) Give the uses of radio isotopes in industries.

17.
i) How many grams are there in the following substances?
a) 2 moles of hydrogen molecule b) 3 moles of chlorine molecule
c) 5 moles of sulphur molecule d) 4 moles of phosphorus molecule
ii) Find out the following statements whether they are True or False. If false give the correct statement:
a) In a solution the component which is present in lesser amount is called solvent.
b) Sodium chloride dissolved in water forms a non-aqueous solution.
c) When Silica gel is kept open, it absorbs moisture from the air, because it is hygroscopic in nature.

18.
i) Draw and label the different types of conjoint vascular bundles.
ii) Give reasons for the following statements:
a) The movement of food substances in the phloem can be in all directions.
b) Mature RBC in mammals do not have cell organelles.

19.
i) What are Okazaki fragments?
ii) Octopus, cockroach and frog all have eyes. Can we group these animals together to establish a common evolutionary origin? Justify your answer.
iii) Write any three differences between Type-1 diabetes and Type-2 diabetes.

20.
i) Write any five salient features of "Modern atomic theory".
ii) Explain how the nature of reactants and concentration of reactants influence the rate of a chemical reaction.