Science Class 10 MCQ Board Paper 1 provides a complete set of important multiple-choice questions designed according to the latest CBSE exam pattern. This paper includes high-quality MCQs from Physics, Chemistry, and Biology to help students practice board-level questions. Solving these MCQs improves understanding of key concepts, enhances accuracy, and boosts confidence for the Class 10 Science Board Examination. This practice paper is ideal for revision, self-assessment, and scoring higher marks in the CBSE board exam.
Science Class 10 MCQ Board Paper 1
1. The chemical reaction of solid calcium oxide with water is :
a. exothermic and the pH of the solution formed is less than 7.
b. endothermic and the pH of the solution formed is less than 7.
c. endothermic and the pH of the solution formed is more than 7.
d. exothermic and the pH of the solution formed is more than 7.
2. Application of Abscisic acid on plants promotes :
a. Development of fruits
b. Wilting of leaves
c. Elongation of stem
d. Formation of flowers
3. In which one of the following decomposition reactions energy is released ?
a. Electrolysis of water
b. Decomposition of silver chloride
c. Decomposition of vegetable matter into compost
d. Decomposition of lead nitrate
4. Juice of tamarind turns blue litmus to red. It is because of the presence of an acid called :
a. oxalic acid
b. lactic acid
c. methanoic acid
d. tartaric acid
5. Which one of the following oxides reacts with HCl as well as NaOH to form corresponding salt and water ?
a. CaO
b. Al2O3
c. Fe3O4
d. K2O
6. Consider the following cases/reactions :
(i) CuSO4 + Al →
(ii) CaSO4 + Mg →
(iii) FeSO4 + Pb →
(iv) ZnSO4 + Ca →
The cases/reactions in which new products will form are :
a. (i) and (iv)
b. (i) and (ii)
c. (ii) and (iii)
d. (i), (ii) and (iv)
7. A hydrocarbon which is different from the other three is :
a. C7H16
b. C5H10
c. C2H6
d. CH4
8. One formula unit of which one of the following salts has seven molecules of water of crystallisation ?
a. CaSO4
b. CuSO4
c. FeSO4
d. Na2CO3
9. Select the correct statements from the following about the human heart :
(i) Right atrium receives oxygenated blood from lungs through pulmonary artery.
(ii) Right atrium receives deoxygenated blood through vena cava from upper and lower body.
(iii) Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body.
(iv) Left atrium transfers oxygenated blood to aorta which sends it to various parts of the body.
a. (i) and (ii)
b. (ii) and (iii)
c. (iii) and (iv)
d. (i) and (iv)
10. In the human alimentary canal, when the process of digestion is completed, the (i) carbohydrates, (ii) fats, and (iii) proteins get converted respectively into :
a. (i) glucose, (ii) fatty acids and (iii) amino acids
b. (i) glucose, (ii) fatty acids and glycerol and (iii) amino acids
c. (i) fatty acids and glycerol, (ii) amino acids and (iii) glucose
d. (i) amino acids, (ii) fatty acids and glycerol and (iii) sugars
11. A gland which does not occur as a pair in the body of human beings is :
a. Adrenal
b. Ovary
c. Pituitary
d. Testis
12. The part of a seed which is a source of food during its germination is :
a. Radicle
b. Cotyledon
c. Plumule
d. Embryo
13. A cross made between two pea plants produces 50% tall and 50% short pea plants. The gene combination of the parental pea plants must be :
a. TT and tt
b. Tt and Tt
c. Tt and tt
d. TT and Tt
14. An optical device always forms images of magnification m = + 1. This device is :
a. Concave mirror
b. Plane mirror
c. Convex lens
d. Concave lens
15. Select the correct statements from the following in the context of the human eye :
(i) Most of the refraction of light rays entering the eye occurs at the crystalline lens.
(ii) The diameter of the eye ball is about 2·3 cm.
(iii) Iris is a dark muscular diaphragm which controls the size of the pupil.
(iv) While focusing on the objects at different distances, the distance between the lens and the retina is adjusted by the ciliary muscles.
a. (i) and (iv)
b. (ii) and (iii)
c. (i), (ii) and (iv)
d. (ii), (iii) and (iv)
16. Four wires a, b, c and d are made of the same materials. If ‘l’ denotes length and ‘r’ denotes radius, then the wire which offers least resistance to the flow of electric current has length and radius respectively as :
a. 2l and 4r
b. l and 2r
c. 4l and r/4
d. l/r and r/2
17. Select from the following, a food chain in which the organism of the second trophic level is missing :
a. small fish, zooplankton, phytoplankton, large fish
b. frog, snake, grass, grasshopper, eagle
c. grass, frog, tiger, snake
d. grass, goat, lion
18. From the following, select a process in which combination reaction occurs :
a. Black and white photography
b. Burning of carbon (coal)
c. Burning of methane
d. Refining of copper
19. Select exothermic processes from the following :
(i) Dilution of acid
(ii) Burning of natural gas
(iii) Evaporation of water
(iv) Electrolysis of water
a. (i) and (ii)
b. (ii) and (iii)
c. (iii) and (iv)
d. (i) and (iv)
20. The most malleable metals are :
a. Iron and gold
b. Copper and silver
c. Silver and gold
d. Gold and copper
21. Consider the reactions of dil. hydrochloric acid with the following metals :
Aluminium, Copper, Iron, Magnesium and Zinc
The correct observation is :
a. Most vigorous reaction with aluminium and no reaction with iron
b. Most vigorous reaction with magnesium and no reaction with iron
c. Most vigorous reaction with magnesium and no reaction with copper
d. Most vigorous reaction with zinc and no reaction with copper
22. The number of covalent bond(s) present in a nitrogen molecule is/are :
(Atomic number of nitrogen is 7)
a. 1
b. 3
c. 5
d. 7
23. The valves in the human heart ensure that :
(i) Oxygen-rich blood flows from left atrium to left ventricle only.
(ii) Deoxygenated blood flows from left atrium to left ventricle only.
(iii) Oxygen-rich blood flows from right atrium to right ventricle only.
(iv) Deoxygenated blood flows from right atrium to right ventricle only.
a. (i) and (iii)
b. (ii) and (iv)
c. (i) and (iv)
d. (ii) and (iii)
24. The part of the hindbrain present immediately above the medulla is :
a. Cerebellum
b. Pons
c. Cerebrum
d. Spinal cord
25. In garden pea, violet colour flower is the dominant trait over white colour flower which is the recessive trait. When parent plant with violet coloured flowers (Vv) is crossed with a parent plant with white flowers, the possible percentage of occurrence of traits in the F1 progeny would be :
a. 100% violet
b. 50% violet, 50% white
c. 25% violet, 75% white
d. 75% violet, 25% white
26. A 5 cm long rod is placed vertically in front of a concave mirror. If its 5 cm long image is formed at 20 cm in front of the mirror, the focal length of the mirror is :
a. − 20 cm
b. − 10 cm
c. − 5 cm
d. 20 cm
27. Which one of the following factors affects the electrical resistivity of a conductor ?
a. Temperature
b. Length
c. Shape
d. Thickness
28. The organism occupying the fourth trophic level in a food chain operating in grassland is :
a. Green plants
b. Frog
c. Grasshopper
d. Snake
29. Which one of the following statements is incorrect about the effect on our environment as a result of our activities ?
a. Improvement in our lifestyle has resulted in greater amounts of waste.
b. Packaging of materials has resulted in lesser amount of non-biodegradable waste.
c. Use of disposable cups/kulhads results in loss of fertile topsoil.
d. Harmful wastes that are non-biodegradable persist in the environment for a long time.
30. Consider the following cases :
(i) CaSO4 + Mg
(ii) CuSO4 + Ca
(iii) ZnSO4 + Fe
(iv) FeSO4 + Zn
The cases in which new products will form, are :
a. (i) and (ii)
b. (ii) and (iv)
c. (iii) and (iv)
d. (ii) and (iii)
31. The number of single and double bonds present in a molecule of benzene (C6H6) respectively, are :
a. 3 and 3
b. 3 and 6
c. 6 and 9
d. 3 and 9
32. Breakdown of proteins in the stomach takes place by the enzyme :
a. Trypsin
b. Lipase
c. Salivary Amylase
d. Pepsin
33. The unit of heredity is :
a. Chromosome
b. Chromatin
c. Gene
d. DNA
34. Refractive index of diamond with respect to glass is 1·6. If the absolute refractive index of glass is 1·5, the absolute refractive index of diamond is :
a. 1·09
b. 1.96
c. 2·4
d. 2·5
35. Select from the following decomposition reactions in which the source of energy for decomposition is heat :
(i) CaCO3 ⎯→ CaO + CO2
(ii) 2H2O ⎯→ 2H2 + O2
(iii) 2AgBr ⎯→ 2Ag + Br2
(iv) 2FeSO4 ⎯→ Fe2O3 + SO2 + SO3
a. (i) and (ii)
c. (iii) and (iv)
b. (ii) and (iii)
d. (i) and (iv)
36. Oxides of aluminium and zinc are :
a. Acidic
b. Amphoteric
c. Basic
d. Neutral
37. The end product of meiosis in a reproductive cell in plants is :
a. Zygote
b. Pollen grains
c. Sperms
d. Egg
38. The strength of the magnetic field inside a current carrying long straight solenoid is :
a. maximum at its centre.
b. minimum at its centre.
c. maximum at the ends and minimum at its centre.
d. uniform throughout its length.
39. Which one of the following factors affects the electrical resistivity of a conductor ?
a. Temperature
b. Length
c. Shape
d. Thickness
40. Concave mirror finds its application in which of the following cases ?
a. A solar furnace
b. A rear-view mirror in vehicles
c. To view full size erect image of distant tall buildings
d. To produce divergent beam of light
41. In an ecosystem, 10% of energy available for transfer from one trophic level to the next in a food chain is in the form of :
a. heat energy
c. mechanical energy
b. chemical energy
d. light energy
42. Assertion a. : Sodium sulphate is a neutral salt.
Reason (R) : Sodium sulphate is a salt formed by a strong acid and a strong base.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
43. Assertion a. : Ozone layer protects the surface of the earth from the harmful ultraviolet radiations.
Reason (R) : Chlorofluorocarbons (CFCs) are responsible for the depletion of the ozone layer present at the higher levels of the atmosphere.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
44. Assertion a. : The rate of breathing in aquatic organisms is faster than that in terrestrial organisms.
Reason (R) : The amount of oxygen dissolved in pond/river water is comparatively higher than the amount of oxygen present in air.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
45. Assertion a. : The magnification of the virtual images produced by concave mirrors is always more than +1.
Reason (R) : The virtual images formed by concave mirrors are erect and magnified.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
46. Assertion a. : Due to scattering of sunlight, the clear sky predominantly appears blue.
Reason (R) : The wavelength of blue light is nearly 1·8 times the wavelength of red light.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
47. Assertion a. : Transpirational pull helps in the absorption and upward movement of water and dissolved minerals in plants.
Reason (R) : The effect of root pressure in transport of water is more significant at night.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
48. Assertion a. : Decomposition of vegetable matter into compost is an exothermic reaction.
Reason (R) : Decomposition reactions need energy to break down the reactants.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
49. Assertion a. : In our homes we receive supply of electric power through a main supply. One of the wires in this supply, usually with red insulation, is called live wire and another wire with green insulation is called neutral wire.
Reason (R) : In our country, the potential difference between the live wire and the neutral wire is 220 volts.
a. Both Assertion a. and Reason (R) are true and Reason (R) is the correct explanation of 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.
Disclaimer: We have provide you with the accurate handout of “Science Class 10 MCQ Board Paper 1“. If you feel that there is any error or mistake, please contact me at anuraganand2017@gmail.com. The above CBSE study material present on our websites is for education purpose, not our copyrights.
All the above content and Screenshot are taken from Science Class 10 NCERT Textbook, CBSE Sample Paper, CBSE Old Sample Paper, CBSE Board Paper and CBSE Support Material which is present in CBSEACADEMIC website, NCERT website This Textbook and Support Material are legally copyright by Central Board of Secondary Education or NCERT. We are only providing a medium and helping the students to improve the performances in the examination.
Images and content shown above are the property of individual organisations and are used here for reference purposes only. To make it easy to understand, some of the content and images are generated by AI and cross-checked by the teachers. For more information, refer to the official CBSE textbooks available at cbseacademic.nic.in.