Science Class 10 MCQ Board Paper 2 is an excellent resource for students preparing for the CBSE Board Examination. This set includes important multiple-choice questions based on the latest CBSE syllabus and exam pattern. These MCQs help students strengthen their understanding of key concepts in Physics, Chemistry, and Biology, ensuring full preparation for the board exam. Practicing these questions improves accuracy, boosts confidence, and helps students score higher marks in Science.
Science Class 10 MCQ Board Paper 2
1. 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 :
a. 8 : 1
b. 2 : 1
c. 1 : 2
d. 1 : 8
2. The products formed when Aluminium and Magnesium are burnt in the presence of air respectively are :
a. Al3O4 and MgO2
b. Al2O3 and MgO
c. Al3O4 and MgO
d. Al2O3 and MgO2
3. 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
a. Strong acid, weak acid, neutral, strong base
b. Weak acid, neutral, weak base, strong base
c. Weak acid, neutral, strong base, weak base
d. Weak acid, neutral, strong base, strong acid
4. Consider the following reactions :
(i) Dilute hydrochloric acid reacts with sodium hydroxide.
(ii) Magnesium oxide reacts with dilute hydrochloric acid.
(iii) Carbon dioxide reacts with sodium hydroxide.
It is found that in each case :
a. Salt and water is formed.
b. Neutral salts are formed.
c. Hydrogen gas is formed.
d. Acidic salts are formed.
5. 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 ?
a. It has high melting point.
b. It is highly soluble in water.
c. It has weak electrostatic forces of attraction between its oppositely charged ions.
d. It conducts electricity in its molten state or aqueous solution.
6. The metals obtained from their molten chlorides by the process of electrolytic reduction are :
a. Gold and silver
b. Calcium and magnesium
c. Aluminium and silver
d. Sodium and iron
7. The formation of magnesium oxide is correctly shown in option :
8. Secretion of less saliva in mouth will effect the conversion of :
a. proteins into amino acids
b. fats into fatty acids and glycerol
c. starch into simple sugars
d. sugars into alcohol
9. The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is :
a. Cytokinins
b. Gibberellins
c. Adrenaline
d. Auxins
10. The correct/true statement(s) for a bisexual flower is/are :
(i) They possess both stamen and pistil.
(ii) They possess either stamen or pistil.
(iii) They exhibit either self-pollination or cross-pollination.
(iv) They cannot produce fruits on their own.
a. (i) only
b. (iv) only
c. (i) and (iii)
d. (i) and (iv)
11. 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 :
a. 50% round and green
b. 75% wrinkled and green
c. 100% round and yellow
d. 75% wrinkled and yellow
12. The breakdown of glucose has taken the following pathway : Glucose a. ⎯⎯⎯→ Pyruvate + Energy b. ⎯⎯⎯→ Lactic acid + Energy The sites ‘a’ and ‘b’ respectively are :
a. Mitochondria and Oxygen deficient muscle cells
b. Cytoplasm and Oxygen rich muscle cells
c. Cytoplasm and Yeast cells
d. Cytoplasm and Oxygen deficient muscle cells
13. 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 ?
(i) The image formed by mirror ‘X’ is real, diminished and at its focus.
(ii) The image formed by mirror ‘Y’ is virtual, diminished and erect.
(iii) The image formed by mirror ‘X’ is virtual, diminished and erect.
(iv) The image formed by mirror ‘Y’ is real, diminished and at its focus.
a. (i) and (ii)
b. (ii) and (iii)
c. (iii) and (iv)
d. (i) and (iv)
14. 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 :
a. hypermetropia and convex lens
b. presbyopia and bifocal lens
c. myopia and concave lens
d. myopia and bifocal lens
15. Which of the following groups do not constitute a food chain ?
(i) Wolf, rabbit, grass, lion
(ii) Plankton, man, grasshopper, fish
(iii) Hawk, grass, snake, grasshopper, frog
(iv) Grass, snake, wolf, tiger
a. (i) and (iv)
b. (ii) and (iii)
c. (i) and (iii)
d. (ii) and (iv)
16. The percentage of solar energy which is not converted into food energy by the leaves of green plants in a terrestrial ecosystem is about :
a. 90%
b. 10%
c. 99%
d. 1%
17. A student has dipped some iron nails in an aqueous solution of copper sulphate. After about 25 minutes, he would observe that the colour of the solution has changed from.
a. blue to colourless
b. blue to pale green
c. pale green to blue
d. pale green to colourless
18. In case of wires of same resistivity, the resistance of the wire will be maximum if the diameter and length of the wire respectively are
a. D and L
b. D/2 and L/4
c. D/3 and L/6
d. D/4 and L/12
19. Select from the following a metal which does not react with cold as well as hot water :
a. Calcium
b. Iron
c. Magnesium
d. Sodium
20. Select ionic compounds from the following :
a. CCl4
b. KCl
c. HCl
d. NaCl
a. b. and c.
b. c. and d.
c. a. and c.
d. b. and d.
21. The products obtained when sodium reacts with ethanol are
a. Sodium ethoxide and hydrogen
b. Sodium ethoxide and oxygen
c. Sodium ethanoate and oxygen
d. Sodium ethanoate and hydrogen
22. The functional group present in butanone is
a. -—CHO
b. -—COOH
c. -OH
d. C =O
23. Movement of soluble product of photosynthesis in plants from leaves to other parts of the plant takes place mainly through
a. Tracheids
b. Sieve tubes
c. Vessels
d. Companion cells
24. The substances that are selectively reabsorbed from the tubular part of the nephron as the urine flow through it are
a. amino acids and salts only
b. amino acids, salts, glucose and water
c. salts and glucose only
d. water, amino acids and glucose
25. A voluntary action such as writing on a paper is controlled by the part of brain called
a. Cerebrum
b. Cerebellum
c. Pons
d. Medulla
26. The plant part/parts having greater concentration of cytokinins is/are
a. fruits only
b. leaves
c. fruits and seeds
d. seeds and leaves
27. Vegetative propagation refers to the production of new plants of the same species from the following parts of a plant
a. stem, flower and fruit
b. roots, stem and flower
c. stem, leaves and flower
d. roots, stem and leaves
28. An object is placed at a distance of 30 cm from the reflecting surface of a concave mirror of radius of curvature 40 cm. The image formed is
a. Virtual and magnified
b. Virtual and diminished
c. Real and magnified
d. Real and diminished
29. A steady current flows through a thick horizontal straight wire from east to west. The direction of the magnetic field produced at a point above the wire is towards
a. North
b. South
c. East
d. West
30. When we focus our eyes on a distance object, the ciliary muscles of our eyes are relaxed. In this case the eye lens becomes
a. thin and its curvature is maximum.
b. thin and its curvature is minimum.
c. thick and its curvature is minimum.
d. thick and its curvature is maximum.
31. The resistance of a wire is 40 Q. If 2 A of current flows through this wire for 50 seconds, the heat produced in the wire is
a. 40003
b. 8000 J
c. 16000 J
d. 80000 J
32. A uniform magnetic field
a. always exerts a force on a current carrying conductor.
b. never exerts a force on a current carrying conductor.
c. exerts a force only when current flows through a conductor along the direction of the field.
d. exert a force only when current flows through a conductor at right angles to the field.
33. Assertion a. : Decomposition reactions are generally endothermic reactions.
Reason (R) : Decomposition of organic matter into compost is an exothermic process.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
34. Assertion a. : A human child bears all the basic features of human beings.
Reason (R) : It looks exactly like its parents, showing very little variations.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
35. 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.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
36. 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. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
37. Assertion a.: Sodium chloride and potassium chloride are neutral salts.
Reason (R) : The pH of these salts is 7.0.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
38. Assertion a.: Variations are seen in off springs produced by sexual reproduction.
Reason (R) : DNA copying in a reproducing cell is not completely accurate.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
39. Assertion a.: The colour of the scattered light depends on the size of the scattering particles.
Reason (R) : Very fine particles scatter mainly red light while particles of larger size scatter light of shorter wavelengths.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
40. Assertion a.: An electric fuse wire is always connected in parallel with the mainline.
Reason (R) =: If an electric current larger than the rated value flows through the electric circuit, the fuse wire melts.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of the Assertion a..
b. Both Assertion a. and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion a..
c. Assertion a. is true, but Reason (R) is false.
d. Assertion a. is false, but Reason (R) is true.
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