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Science M.C.Q

MODEL PAPER - 8 [2026] · CBSE STD 10 (CBSE - English Medium). 7 questions.

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M.C.Q

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7 questions · timed · auto-graded

MCQ 11 Mark
Electrical impulse travels in a neuron from -
  • ✓
    Dendrite → cell body → axon → axonal end
  • B
    Dendrite → axon → axonal end → cell body
  • C
    Cell body → dendrite → axon → axonal end.
  • D
    Axonal end → axon → cell body → dendrite
Answer
Correct option: A.
Dendrite → cell body → axon → axonal end
(A) Dendrite → cell body → axon → axonal end
Explanation :
Dendrite recieve the stimulus through recptors and transfer to cell body. Long axon passes the impulse to axonal end to transer to another axon.
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MCQ 21 Mark
Match the following with correct response.
Column AColumn B
(i) Cretinism(a) Over secretion of growth hormone
(ii) Gigantism (b) Under secretion of ADH
(iii) Exophthalmia(c) Over secretion of thyroxin
(iv) Diabetes insipidus(d) Deficiency of thyroxin
  • A
    (i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
  • B
    (i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
  • ✓
    (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
  • D
    (i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)
Answer
Correct option: C.
(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
(C) (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
Explanation :
- It is a condition of severely stunted physical and mental growth owing to untreated congenital deficiency of thyroid hormone.
- Gigantism is a rare condition that causes abnormal growth in children caused by growth hormones.
- Protrusion of the eyeball from the orbit, caused by disease, especially hyperthyroidism, or injury.
- A disorder of salt and water metabolism marked by intense thirst and heavy urination.
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MCQ 31 Mark
Which of the following is/are terrestrial ecosystem(s)?
A. Forest
B. Aquarium
C. Grassland
D. Desert
  • A
    A, B and D
  • ✓
    A, C and D
  • C
    A and D
  • D
    A and B
Answer
Correct option: B.
A, C and D
(B) A, C and D
Explanation :
All given ecosystems are terrestrial ecosystems. Forest, grassland and desert are natural ecosystems. An aquarium is an example of a human-made (artificial) ecosystem.
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MCQ 41 Mark
Which of the following statement(s) is (are) true about respiration?
i. During inhalation, ribs move inward and the diaphragm is raised
ii. In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air
iii. Haemoglobin has a greater affinity for carbon dioxide than oxygen
iv. Alveoli increase surface area for exchange of gases
  • A
    (i) and (iii)
  • B
    (i) and (iv)
  • ✓
    (ii) and (iv)
  • D
    (ii) and (iii)
Answer
Correct option: C.
(ii) and (iv)
(C) (ii) and (iv)
Explanation :
Statement (i) is wrong because ribs move outward and the diaphragm is lowered during inhalation.
Similarly, statement (iii) is wrong because hemoglobin has a greater affinity for Oxygen than $\mathrm{CO}_{2}$.
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MCQ 51 Mark
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about:
  • A
    $10 \%$
  • ✓
    $1 \%$
  • C
    $5 \%$
  • D
    $8 \%$
Answer
Correct option: B.
$1 \%$
(B) $1 \%$
Explanation :
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about one percent. The green plants (producers) use this solar energy for the process of photosynthesis, convert it into food energy and make the energy available to the rest of the ecosystem.
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MCQ 61 Mark
Which of the following is not a nitrogenous base?
  • A
    Cytosine
  • B
    Guanine
  • C
    Adenine
  • ✓
    Deoxyribose sugar
Answer
Correct option: D.
Deoxyribose sugar
(D) Deoxyribose sugar
Explanation :
A nitrogenous base is simply a nitrogen-containing molecule that has the same chemical properties as a base. They are particularly important since they make up the building blocks of DNA and RNA: adenine, guanine, cytosine, thymine, and uracil.
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MCQ 71 Mark
While preparing a temporary stained mount of a leaf epidermal peel, the extra stain is removed by
  • A
    washing with water
  • B
    washing with calcium chloride solution
  • ✓
    soaking with filter paper
  • D
    absorbing with cotton wool
Answer
Correct option: C.
soaking with filter paper
(C) soaking with filter paper
Explanation :
Filter paper absorbs the extra stain.
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M.C.Q - Science STD 10 Questions - Vidyadip