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Science M.C.Q

MODEL PAPER 2025 · CBSE STD 10 (CBSE - English Medium). 16 questions.

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M.C.Q

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16 questions · timed · auto-graded

MCQ 11 Mark
Which of the following is not a role of decomposers in the ecosystem?
  • A
    Natural replenishment of soil.
  • B
    Enrichment of oxygen in atmosphere.
  • C
    Waste decomposition.
  • D
    Break-down of dead remains.
Answer
Enrichment of oxygen in the atmosphere.
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MCQ 21 Mark
Identify the incorrect statement
'The energy available to the producers is maximum' because:
  • A
    It is the first trophic level which absorbs1% of light energy directly from the source.
  • B
    It utilizes the most of the chemical energy for its own respiration, growth, reproduction, movement etc.
  • ✓
    It utilizes 10% of light energy and transfers the rest to the next trophic level.
  • D
    It transfers only 10% of light energy to the next trophic level.
Answer
Correct option: C.
It utilizes 10% of light energy and transfers the rest to the next trophic level.
It utilizes 10% of light energy and transfers the rest to the next trophic level.
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Question 31 Mark
Image
Choose the correct option for the colour of rays for A and B.
Colour of Ray AColour of Ray B
A.BlueRed
B.GreenYellow
C.RedViolet
D.VioletIndigo
Answer
Red Violet
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MCQ 41 Mark
In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?
  • A
    A ray parallel to the principal axis.
  • ✓
    A ray passing through the centre of curvature and incident obliquely.
  • C
    A ray passing through the principal focus and incident obliquely.
  • D
    A ray incident obliquely to the principal axis, at the pole of the mirror.
Answer
Correct option: B.
A ray passing through the centre of curvature and incident obliquely.
A ray passing through the centre of curvature and incident obliquely.
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MCQ 51 Mark
In snails individuals can begin life as male and depending on environmental conditions they can become female as they grow. This is because
  • A
    male snails have dominant genetic makeup.
  • B
    female snails have dominant genetic makeup
  • C
    expression of sex chromosomes can change in a snail's life time.
  • D
    sex is not genetically determined in snails
Answer
sex is not genetically determined in snails.
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MCQ 61 Mark
There was a cerebellar dysfunction in a patient. Which of the following activities will get disturbed in this patient as a result of this?
  • A
    Salivation
  • B
    Hunger control
  • C
    Posture and balance
  • D
    Regulation of blood pressure
Answer
Posture and balance.
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MCQ 71 Mark
Which of the following adaptations in herbivores helps in digestions of cellulose?
  • A
    Longer large intestine
  • B
    Smaller large intestine
  • C
    Smaller small intestine
  • D
    Longer small intestine
Answer
Longer small intestine.
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MCQ 81 Mark
During which of the following stages of the circulation of blood in a normal human being, the oxygenated blood is pumped to all parts of the body?
  • A
    contraction of the left atrium
  • B
    contraction of left ventricle
  • C
    relaxation of the right atrium
  • D
    relaxation of the right ventricle
Answer
contraction of left ventricle.
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MCQ 91 Mark
During cellular oxidation of Glucose, ATP is produced along with formation of other products in this reaction. Which of the following events is associated with production of maximum ATP molecules per molecule of Glucose during this process? Synthesis of
  • A
    ethanol in yeast
  • B
    lactic acid in muscle cells
  • C
    carbon dioxide in yeast cells
  • ✓
    carbon dioxide in human cells
Answer
Correct option: D.
carbon dioxide in human cells
carbon dioxide in human cells
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MCQ 101 Mark
Which of the following is an endothermic reaction?
  • A
    Burning of candle.
  • B
    Cooking of food.
  • C
    Decomposition of Vegetable matter.
  • D
    Reaction of Sodium with air
Answer
Cooking of food
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MCQ 111 Mark
The electronic configuration of three elements X, Y and Z are X- 2, 8, 7; Y- 2, 8, 2; and Z-2, 8
  • A
    Y and Z are metals
  • B
    Y and X are non-metals
  • C
    X is a non-metal and Y is a metal
  • D
    Y is a non-metal and Z is a metal
Answer
X is a non-metal and Y is a metal.
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MCQ 121 Mark
When 50g of lead powder is added to 300 ml of blue copper sulphate solution, after a few hours, the solution becomes colourless. This is an example of
  • A
    Combination reaction
  • B
    Decomposition reaction
  • ✓
    Displacement reaction
  • D
    Double displacement reaction
Answer
Correct option: C.
Displacement reaction
Displacement reaction
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MCQ 131 Mark
An aqueous solution 'A' turns the phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A', the pink colour disappears. Which of the following statement is true for the solutions 'A' and 'B'.
  • A
    A is strongly basic and B is a weak base.
  • B
    A is strongly acidic and B is a weak acid.
  • C
    A has a pH greater than 7 and B has a pH less than 7.
  • D
    A has a pH less than 7 and B has a pH greater than 7.
Answer
A has a pH greater than 7 and B has a pH less than 7
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MCQ 141 Mark
Image
The solution in the given figure is likely to be
  • A
    $HNO _3$
  • B
    $C _2 H _5 OH$
  • C
    $H _2 SO _4$
  • D
    $CO _2$ in water
Answer
Alternate question for $VI$
Dilute acid
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MCQ 151 Mark
Match column I with column II and select the correct option using the given codes.
Column IColumn II
a. A metal that forms amphoteric oxides(i) Ga
b. A metal which melts when kept on our palm(ii) Au
c. A metal that reacts with nitric acid(iii) Al
d. A metal which cannot displace hydrogen from acids(iv) Mn
  • A
    a(ii), b(i), c- (iii), d- (iv)
  • B
    a - (iii), b - (i), c - (iv), d - (ii)
  • C
    a - (iv), b - (ii), c - (iii), d - (i)
  • D
    a - (iii), b - (ii), c - (i), d - (iv)
Answer
a – (iii), b – (i), c – (iv), d – (ii)
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MCQ 161 Mark
Identify 'p', 'q' and 'r' in the following balanced reaction
                       Heat $p Pb \left( NO _3\right)_{2(s)}---->q PbO _{( s )}+ rNO _{2(g)}+ O _{2(g)}$
  • ✓
    2,2,4
  • B
    2,4,2
  • C
    2,4,4
  • D
    4,2,2
Answer
Correct option: A.
2,2,4
2,2,4
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M.C.Q - Science STD 10 Questions - Vidyadip