10th Science Model First Mid-Term Question Paper

Your first mid-term exam sets the tone for the entire academic year. This Class 10 Science Model First Mid-Term Question Paper is specially designed to help you evaluate your understanding of the introductory chapters in your syllabus. Featuring a balanced mix of objective questions, short definitions, and basic conceptual problems, this model paper mimics real school testing patterns to help you practice time management and build early exam confidence.

MODEL FIRST MID TERM TEST

CLASS: 10 SUBJECT: SCIENCE MARKS: 50 TIME: 1:30

I. Choose the correct answer: (3 × 1 = 3)

1) The value of universal gas constant
a) 8.31 J mol^-1 K^-1 b) 8.32 J mol^-1 K^-1
c) 8.13 J mol^-1 K^-1 d) 8.33 J mol^-1 K^-1

2) 1 mole of any substance contains _______ molecules.
a) 6.022 × 10²³ b) 6.023 × 10²³
c) 6.022 × 10³² d) 6.023 × 10²²

3) The wall of human heart is made of
a) Endocardium b) Epicardium
c) All the above d) Myocardium

II. Answer the following questions. Q.no: 11 is compulsory: (5 × 2 = 10)

4. What causes the opening and closing of guard cells of stomata?

5. Write the types of isotopes of oxygen and its percentage abundance.

6. What connection is used in domestic appliances and why?

7. Distinguish between linear, areal or superficial expansion.

8. Differentiate convex lens and concave lens.

9. List out the parasitic adaptations in leech.

10. Calculate the number of moles in 1.51 × 10²³ molecules of NH₄Cl.

11. An object of height 3 cm is placed at 10 cm from a concave lens of focal length 15 cm. Find the size of image.

III. Answer the following questions: (4 × 4 = 16)

12. Why should the light dependent reaction occur before the light independent reaction?

13. Why is the sinoatrial node called the pacemaker of heart?

14. Give the salient features of "Modern Atomic theory".

15. List the merits of LED Bulb.

16. A 100 watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. Calculate the energy consumed (in kWh) in the month of January.

17. Calculate the % of oxygen in Al₂(SO₄)₃.

IV. Answer either of the following questions: (3 × 7 = 21)

18. i)
a) Explain about domestic electric circuits. (5)
b) An alloy of nickel and chromium is used as the heating element. Why? (2)

(or)

ii)
a) Explain the construction and working of compound microscope. (5)
b) State Boyle's law. (2)

19. i)
a) Give the salient features of "Modern Atomic theory". (4)
b) Calculate the number of water molecules present in one drop of water which weighs 0.18 g. (3)

(or)

ii)
a) Derive the relationship between relative molecular mass and vapour density. (5)
b) Calculate the number of moles in 27 g of Al. (2)

20. i)
a) Enumerate the functions of blood. (5)
b) Mature RBCs in mammals do not have cell organelles. (2)

(or)

ii)
a) Describe and name three stages of cellular respiration that aerobic organisms use to obtain energy from glucose. (5)
b) How does leech suck blood from the host? (2)