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CBSE 10th Half-Yearly Exam 2025-26 : Science Top 50 MCQs with Answers
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Science is a very important subject for students preparing for CBSE Class 10 Half-Yearly Exam 2025-26.
Keeping this in mind, here are the top 50 Science MCQs with answers, which will help students score high marks in the exam.
👉 Read Also - CBSE Class 10 Science Half Yearly Sample Paper 2025-26 with Solutions PDF
The pattern of the half-yearly exam is no longer based only on rote learning, but the proportion of Competency-Based Questions has also been increased.
Such questions test the students' understanding, reasoning and application of knowledge in real life. For this reason, it becomes even more necessary to practice Multiple Choice Questions (MCQs).
👉 Read Also - CBSE 10th Science Half-Yearly Exam 2025-26: Important Short Notes & PYQs
CBSE 10th Half-Yearly Science Important Question 2025
1. When Ag is exposed to air it gets a black coating of
(a) AgNO3
(b) Ag2S
(c) Ag2O
(d) Ag2CO3
Answer. b
2. Which of the reactions is used in black and white photography?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Oxidation reaction
MnO2 + 4HCl →MnCl2 + 2H2O + Cl2
Answer. b
3. Identify the substance oxidized in the above equation.
(a) MnCl2
(b) HCl
(c) H2O
(d) MnO2
Answer. b
4. The brown gas evolved on heating of copper nitrate is
(a) O2
(b) NO2
(c) N2
(d) NO
Answer. a
5. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
(a) 1: 1
(b) 2:1
(c) 4:1
(d) 1:2
Answer. b
6. A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.
(a) CaOCl2
(b) Ca (OH)2
(c) CaO
(d) CaCO3
Answer. c
7. 2HNO3 + Ca (OH)2 → Ca (NO3)2 + 2H2O; is an example of
(i) displacement reaction
(ii) double displacement reaction
(iii) neutralisation reaction
(iv) combination reaction.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Answer. b
8. A substance X which is a group 2 element is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Element X is
(a) Cu
(b) Ca
(c)Na
(d) Al
Answer. b
9. Generally, when certain metals react with an acid they release gas.
(a) Nitrogen
(b) Oxygen
(c) Hydrogen
d) Argon
Answer. c
10. Milkiness of lime water disappear when excess CO2 is passed due to the formation of-
(a) Calcium hydroxide
(b)Calcium chloride
(c) Calcium bicarbonate
(d)Calcium carbonate
Answer. (c) Calcium bicarbonate
👉 CBSE Class 10 Study Materials
| CBSE Class 10 Syllabus 2025-26 | NCERT Solutions For Class 10 |
| CBSE Class 10 Previous Year Question Papers | CBSE Class 10 Books |
| CBSE Class 10 Full Study Material | CBSE Class 10 Sample Paper 2025-26 |
11. What is formed when zinc reacts with sodium hydroxide?
(a) Zinc hydroxide and sodium
(b) Sodium zincate and hydrogen gas
(c) Sodium zinc-oxide and hydrogen gas
(d) Sodium zincate and water
Answer. b
12.The common name for the substance used as antacid-
(a) Washing soda
(b) Plaster of Paris
(c) Bleaching powder
(d) Baking soda
Answer. d
13. Rain is called acid rain when it's:
(a) pH falls below 7
(b) pH falls below 6
(c) pH falls below 5.6
(d) pH is above 7
Answer. c
14. Sodium hydroxide turns phenolphthalein solution
(a) pink
(b) yellow
(c) colourless
(d) orange
Answer. a
15.Sodium carbonate is a basic salt because it is a salt of a
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base
Answer. d
16. Which one of the given is true, if a substance has a pH value of 7?
(a) The substance is a base
(b) The substance is an acid
(c) The substance is a neutral substance
(d) Either (A) or (B)
Answer. c
17. The most abundant metal in the earth’s crust is
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Answer. b
18. The electronic configuration of three elements X, Y and Z are as follows: X = 2, 4 Y = 2, 7 Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula,
(a) X2Y
(b) ZY
(c) XZ3
(d) Y2Z
Answer. b
19. Which of the following property is generally not shown by metals?
a) Electrical conduction
b) Sonorous
c) Dullness
d) Ductility
Answer. c
20. Which one of the following metals do not react with cold as well as hot water?
a) Na
b) Ca
c) Mg
d) Fe
Answer. d
21. Which of the following pair of metals exist in their native state in nature?
(a) Ag and Au
(b) Ag and Zn
(c) Au and Hg
(d) Au and Fe
Answer. a
22.The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
(a) He
(b) Ar
(c) Ne
(d) Kr
Answer. c
23. The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called________
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
Answer. c
24. Which of the following metals exist in their native state in nature?
(i) Cu (ii) Au (iii) Zn (iv) Ag
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)
Answer. c
25. Identify the unsaturated compounds from the following
(i) Propane (ii) Propene (iii) Propyne (iv) Chloropropane
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (iii) and (iv)
(d) (ii) and (iii)
Answer. d
26. In which of the following compounds, — OH is the functional group?
(a) Butanone
(b) Butanol
(c) Butanoic acid
(d) Butanal
Answer. b
27. The hetero atoms present in CH3-CH2-O-CH2-CH2-Cl are
(i)oxygen (ii) carbon (iii ) hydrogen (iv) chlorine
(a) (i) and (ii)
(b) (ii) and (iii)
(c)(iii) and (iv)
(d) (i) and (iv)
Answer. d
28. Oils on treating with hydrogen in the presence of palladium or nickel catalyst forms fats. This is an example of
(a) addition reaction
(b) substitution reaction
(c) displacement reaction
(d) oxidation reaction
Answer. a
29.. The carbon exist in the atmosphere in the form of
(a) Carbon monoxide only
(b) Carbon monoxide in traces and carbon dioxide
(c) carbon dioxide only
(d) coal
Answer. b
30.. Buckminsterfullerene is an allotropic form of
(a) phosphorus
(b) sulphur
(c) carbon
(d) tin
Answer. c
31. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm.
(b) mitochondria.
(c) chloroplast.
(d) nucleus.
Answer. b
32. In which of the following groups of organisms, food materials are broken down outside the body and absorbed?
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm
Answer. b
33. Which of the following statements about the autotrophs is incorrect?
(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level in food chains
Answer. c
34. Choose the correct path of urine in our body
(a) kidney →ureter →urethra →urinary bladder
(b) kidney →urinary bladder →urethra →ureter
(c) kidney →ureters →urinary bladder →urethra
(d) urinary bladder →kidney →ureter →urethra
Answer. b
35. In normal expiration, the diaphragm is
(a) Arched
(b) Flattened
(c) Perforated
(d) None of these
Answer. a
36. How is food transported from phloem to the tissues according to plants’ needs?
(a) food is transported along with the water in the plant’s body.
(b)food is transported in only one direction like water in the plant body through xylem.
(c) food is transported from a region with low concentration to higher concentration.
(d)food is transported from a region where it is produced to other parts of the plants.
Answer. d
37. Which of the following statements is correct about receptors?
(a) Gustatory receptors detect taste while olfactory receptors detect smell
(b) Both gustatory and olfactory receptors detect smell
(c) Auditory receptors detect smell and olfactory receptors detect taste
(d) Olfactory receptors detect taste and gustatory receptors smell
Answer. a
38. Cerebellum is situated in ___________.
- fore brain
- midbrain
- hindbrain
- partly in A and B each
Answer. c
39. A doctor advised a person to take an injection of insulin because——-.
A) His blood pressure was low
B) His heart was beating slowly
C) He was suffering from goitre
D) His sugar level in blood was high
Answer. d
40. Which is the correct sequence of the components of a reflex arc?
(a) Receptors → Muscles → Sensory neuron → Motor neuron → Spinal cord
(b) Receptors → Motor neuron → Spinal cord → Sensory neuron → Muscle
(c) Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
(d) Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
Answer. d
41. In reflex action, the reflex arc is formed by
- Muscles - receptor – brain
- Muscles - effector – brain
- Receptor - spinal cord – muscles
- Spinal cord - receptor – muscles
Answer. c
42. Posture and balance of the body is controlled by
(a) cerebrum
(b) cerebellum
(c) medulla
(d) pons
Answer. b
43. Damage of cerebellum will mostly affect the career of :
A) architect
B) teacher
C) librarian
D) athlete
Answer. d
44. The movement of shoot towards light is
(a) geotropism
(b) hydrotropism
(c) chemotropism
(d) phototropism
Answer. d
45. Where does fertilisation occur in human females?
a. Uterus
b. Cervix
c. Oviduct
d. None of these
Answer. c
46. IUCD is for
1. Vegetative propagation
2. Contraception
3. Increasing fertility
4. Avoiding miscarriage
Answer. b
47. Which is the portion on which grafting is done it provides the roots?
a. Stock
b. Scion
c. Both a and b
d. None of these
Answer. a
48. When an animal is cut into pieces and each piece grows into a complex organism. What is the process?
a. Budding
b. Fragmentation
c. Spore formation
d. Regeneration
Answer. d
49. Which among the following does not reproduce by spore formation:
(a) Penicillium fungus
(b) Yeast fungus
(c) Mucor fungus
(d) Rhizopus fungus
Answer. c
50. What is the puberty age in human males?
a. 8-10
b. 10-12
c. 12-14
d. 14-16
Answer. c
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