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MODEL PAPER - 8 [2026] Science - MODEL PAPER - 8 [2026]

CBSE - STD 10 - Science (CBSE - English Medium). 45 questions in this chapter.

Question types

MODEL PAPER - 8 [2026] question types

45 questions across 18 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

45
Questions
18
Question groups
5
Question types
Sample Questions

MODEL PAPER - 8 [2026] questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q1 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: A.

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Q 2M.C.Q1 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: C.

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Q 3M.C.Q1 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: B.

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Q 4M.C.Q1 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: C.

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Q 5M.C.Q1 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: B.

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Q 6M.C.Q-[Che-1M]1 Mark
Plaster of Paris hardens by
  • A
    Passing of $\mathrm{CO}_{2}$ gas
  • B
    Changing into $\mathrm{CaCO}_{3}$
  • ✓
    Combining with water
  • D
    Releasing out a molecule of water

Answer: C.

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Q 7M.C.Q-[Che-1M]1 Mark
The correct formula of ethanol is:
  • A
    $\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{OH}$
  • ✓
    $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$
  • C
    $\mathrm{CH}_{3} \mathrm{OH}$
  • D
    $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}$

Answer: B.

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Q 8M.C.Q-[Che-1M]1 Mark
Match the following with the correct response :
Column AColumn B
(i) Ionic bond(a) $\mathrm{NH}_{3}$
(ii) Polar covalent bond(b) $\mathrm{C}_{60}$
(iii) Non-polar bond(c) $\mathrm{N}_{2}$
(iv) Fullerene(d) NaCl
  • A
    (i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)
  • ✓
    (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
  • C
    (i) - (b), (ii) - (d), (iii) - (a), (iv) - ©
  • D
    (i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)

Answer: B.

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Q 9M.C.Q-[Che-1M]1 Mark
The slag obtained during the extraction of copper pyrites is composed mainly of :
Image
  • A
    $\mathrm{CuSiO}_{3}$
  • B
    $\mathrm{SiO}_{2}$
  • C
    $\mathrm{Cu}_{2} \mathrm{~S}$
  • ✓
    $\mathrm{FeSiO}_{3}$

Answer: D.

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Q 13Assertion - Reasoning [Che-1 M]1 Mark
Assertion (A) : While dissolving an acid or base in water, the acids must always be added slowly to water with constant stirring.
Reason (R) : Dissolving an acid on a base in water is a highly exothermic reaction.
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Q 15[2 Mark Questions]2 Marks
In the following food chain, 20 J of energy was available to the hawks. How much would have been present in the plants?
Plants → rats → snakes → hawks
Image
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Q 16[2 Mark Questions]2 Marks
i. Write two harmful effects of using plastic bags on the environment. Suggest alternatives to the usage of plastic bags.
ii. List any two practices that can be followed to dispose off the waste produced in our homes.
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Q 18Answer the questions.[Che-2M]2 Marks
When a piece of limestone reacts with dilute HCl , a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X , the white precipitate dissolves forming a soluble compound Z.
a. What are $\mathrm{X}, \mathrm{Y}$ and Z ?
b. Write equations for the reactions which take place :
i. When limestone reacts with dilute HCl .
ii. When gas X reacts with lime water to form white precipitate Y .
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Q 20[3 Mark Questions]3 Marks
In pea plant, round seed is dominant over the wrinkled. If a cross is carried out between these two plants, give answer to the following questions.
i. Mention the genes for the traits of parents.
ii. State the trait of $\mathrm{F}_{1}$ hybrids.
iii. Write the ratio of $\mathrm{F}_{2}$ progeny obtained from this cross. What is the name of the cross?
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Q 22Answer the questions.[Che-3M]3 Marks
In a chemistry laboratory, students were instructed to set up three experiments, details of which are given below:
Experiment No.Set up details
1.2 iron nails in a cork capped test tube + Tap water immersing the nails +
2.2 iron nails in a cork capped test tube + Boiled water immersing the nails + Oil on top of water layer.
3.2 iron nails In a cork capped test tube + Cotton wool on top of the iron nails + Granules of calcium chloride on cotton wool.
Indicate the changes observed in the nails kept in all the three setups, with reasons.
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Q 23Answer the questions.[Che-3M]3 Marks
Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
i. In thermite reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
ii. Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
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Q 24[5 marks Questions]5 Marks
Given below is a diagram of the human endocrine system.
Image
Using the given diagram, answer the following questions:
i. How pituitary gland regulates the growth of the body?
ii. Which hormone is responsible for the carbohydrate, protein, and fat metabolism in the body?
iii. Which pair of glands prepare the body to deal with emergency situations?
iv. Which gland secretes insulin and what does it do in the body?
v. What is the function of endocrine glands?
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Q 25[5 marks Questions]5 Marks
a. List the sequence of events in the uterus of a human female from fertilisation of egg till childbirth.
b. State the changes that are observed in the uterus if fertilisation of egg does not occur.
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Q 26case /data -based [Che-4M]4 Marks
When a more reactive element displaces a less reactive element from its compound, it is called a displacement reaction. The reaction is of two types. Single displacement reaction and double displacement reaction.
Iron being more reactive than copper displaces copper from an aqueous solution of copper sulphate. This is an example of a single displacement reaction.
On adding silver nitrate solution to sodium bromide, a yellow ppt of silver bromide and solution of sodium nitrate is formed. This is an example of a double displacement reaction.
i. When dil. sulphuric acid is added to pieces of iron sulphide, hydrogen sulphide gas is produced and soluble ferrous sulphate is formed. Which chemical reaction is involved in this process?
ii. Mention reaction which is used for the preparation of oxygen gas in the laboratory.
iii. What are the products formed in the double displacement reaction discussed below?
Image
OR
Which elements displace aluminum from its salt?
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Q 27case /data -based (4 Marks)4 Marks
A student crossed pea plants having round and yellow seeds with pea plants having wrinkled and green seeds. He found that only one type of seeds were produced in the $F_{1}$ generation. When these $F_{1}$ generation pea plants were self - pollinated with each other, then in addition to the seed type of $\mathrm{F}_{1}$ generation, some new types of seed combinations were also obtained in the $\mathrm{F}_{2}$ generation.
i. Write any two contrasting visible characters other than the ones shown above, taken by Mendel for his experiment.
ii. Mention the dominant traits observed in $\mathrm{F}_{1}$ generation.
iii. Give reason why the traits which were not visible in the seeds of $F_{1}$ generation reappeared in the seeds of $F_{2}$ generation. Write the ratio of different types of seeds obtained in $\mathrm{F}_{2}$ generation in this case.
OR
What is meant by the terms (I) dominant, and (II) recessive traits? Explain.
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Q 28Answer the questions.[Che-5M]5 Marks
i. Draw the structure of the following compounds:
a. Butanoic acid
b. Chloropentane
ii. How are structure (i) and structure (ii) given below related to one another? Give reason to justify your answer.
Image
Draw one more possible structure for above case.
iii. Differentiate between saturated and unsaturated carbon compounds on the basis of their general formula.
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Q 29Answer the questions.[Che-5M]5 Marks
i. Name a commercially important carbon compound having functional group - OH and write its molecular formula.
ii. Write chemical equation to show its reaction with
1. Sodium metal
2. Excess conc. sulphuric acid
3. Ethanoic acid in the presence of an acid catalyst
4. Acidified potassium dichromate
iii. Also write the name of the product formed in each case.
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Q 30M.C.Q-[Phy-1M]1 Mark
In the following diagram showing dispersion of white light by a glass prism, the colours $\mathbf{P}$ and $\mathbf{Q}$ respectively are -
Image
  • ✓
    Violet and Red
  • B
    Orange and Green
  • C
    Red and Blue
  • D
    Red and Violet

Answer: A.

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Q 31M.C.Q-[Phy-1M]1 Mark
A real image is formed by the light rays after reflection or refraction when they :
A. actually meet or intersect with each other.
B. actually converge at a point.
C. appear to meet when they are produced in the backward direction.
D. appear to diverge from a point.
Which of the above statements are correct?
  • ✓
    (A) and (B)
  • B
    (B) and (D)
  • C
    (B) and (C)
  • D
    (A) and (D)

Answer: A.

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Q 33Answer the questions.[Phy-2M]2 Marks
Several electric bulbs designed to be used on a 220 V electric supply line are rated 10 W . How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A ?
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Q 34Answer the questions.[Phy-2M]2 Marks
A copper wire has diameter 0.5 mm and resistivity $1.6 \times 10^{-8} \Omega \mathrm{~m}$. What will be the length of this wire to make its resistance $10 \Omega$ ? How much does the resistance change if the diameter is doubled?
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Q 35Answer the questions.[Phy-2M]2 Marks
State reasons to explain these observations.
a. Our eye is more sensitive to yellow colour but even then danger signals are red in colour.
b. Violet colour is seen at the bottom of the spectrum when light is displaced by a prism.
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Q 36Answer the questions.[Phy-3M]3 Marks
i. State the rule to determine the direction of a
a. magnetic field produced around a straight conductor carrying current
b. force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and
c. current induced in a coil due to its rotation in a magnetic field.
ii. State the purpose for which the following rules are used
a. Right hand thumb rule
b. Fleming's left hand rule
c. Fleming's right hand rule
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Q 38Answer the questions.[Phy-3M]3 Marks
i. A straight cylindrical conductor is suspended with its axis perpendicular to the magnetic field of a horse-shoe magnet. The conductor gets displaced towards left when a current is passed through it. What will happen to the displacement of the conductor if the
1. current through it is increased?
2. horse-shoe magnet is replaced by another stronger horse-shoe magnet?
3. direction of current through it is reversed?
ii. Name and state the rule for determining the direction of force on a current carrying conductor in a magnetic field.
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Q 39case /data -based [Phy-4M]4 Marks
When electric current flows in a purely resistive circuit electrical energy gets fully converted into heat energy. The amount of heat produced (H) in the circuit is found to be directly proportional to (i) the square of current $\mathrm{I}^{2}$
(ii) the resistance $(R)$ of the conductor and (iii) the time $(t)$ for which current flows. In other words $H=I^{2} R t$.
Electrical devices such an electric fuse, electric heater, electric iron etc. are all based on this effect called heating effect of electric current.
a. List two properties of heating elements.
b. List two properties of electric fuse.
c. Name the principle on which an electric fuse works. Explain how a fuse wire is capable of saving electrical appliances from getting damaged due to accidently produced high currents.
OR
The power of an electric heater is 1100 W . If the potential difference between the two terminals of the heater is 220 V , find the current flowing in the circuit. What will happen to an electric fuse of rating 5 A connected in this circuit?
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Q 40Answer the questions.[Phy-5M]5 Marks
i. A person suffering from myopia (near-sightedness) was advised to wear the corrective lens of power -2.5 D . A spherical lens of the same focal length was taken in the laboratory. At what distance should a student place an object from this lens so that it forms an image at a distance of 10 cm from the lens?
ii. Draw a ray diagram to show the position and nature of the image formed in the above case.
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Q 41Answer the questions.[Phy-5M]5 Marks
A concave lens of focal length 60 cm is used to form an image of an object of length 9 cm kept at a distance of 30 cm from it. Use lens formula to determine the nature, position and length of the image formed. Also draw labelled ray diagram to show the image formation in the above case.
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