CLASS 10TH MP BOARD SOLVED PAPER 2024
Section 1: Multiple Choice Questions
(i) FeโOโ + 2Al โ AlโOโ + Fe
The above reaction is an example of a:
(a) Combination reaction
(b) Double displacement reaction
(c) Decomposition reaction
(d) Displacement reaction
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Answer: (d) Displacement reaction
Reason: In this reaction, aluminum displaces iron from iron oxide (FeโOโ) to form aluminum oxide (AlโOโ) and iron. This is a classic example of a single displacement reaction, specifically thermite reaction, which is highly exothermic.
(ii) Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotic
(b) Analgesic
(c) Antacid
(d) Antiseptic
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Answer: (c) Antacid
Reason: Antacids neutralize excess acid in the stomach, thus relieving indigestion and acidity problems. Common antacids include magnesium hydroxide and aluminum hydroxide.
(iii) Which of the following methods is suitable for preventing an iron frying pan from rusting?
(a) Applying grease
(b) Applying paint
(c) Applying coating of zinc
(d) Applying coating of chromium
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Answer: (c) Applying coating of zinc
Reason: The process of coating iron with a layer of zinc is called galvanization. Zinc prevents rusting because it acts as a protective layer and also sacrifices itself to corrosion (sacrificial protection).
(iv) Butanone is a four carbon compound with the functional group โ
(a) Carboxylic acid
(b) Aldehyde
(c) Ketone
(d) Alcohol
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Answer: (c) Ketone
Reason: Butanone (CHโCOCHโCHโ) is a ketone, and the functional group for ketones is โCOโ. It has the carbonyl group attached to two carbon atoms.
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(v) The breakdown of pyruvate to give carbon dioxide, water and energy, this reaction takes place in โ
(a) Cytoplasm
(b) Mitochondria
(c) Chloroplast
(d) Nucleus
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Answer: (b) Mitochondria
Reason: The mitochondria are the “powerhouses” of the cell. The breakdown of pyruvate (a product of glycolysis) to COโ and water during aerobic respiration occurs in mitochondria and releases energy in the form of ATP.
(vi) The gap between two neurons is called โ
(a) Dendrite
(b) Synapse
(c) Axon
(d) Impulse
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Answer: (b) Synapse
Reason: A synapse is the tiny gap between the axon terminal of one neuron and the dendrite of another. It is where the transmission of nerve signals occurs via neurotransmitters.
Section 2: Fill in the Blanks
(i) The disposal of the waste we generate is causing serious ______ problems.
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Answer: Environmental
Reason: Improper waste disposal leads to pollution, soil contamination, and health issues โ all environmental problems.
(ii) The least distance of distinct vision for a young adult with normal eyesight is about ______.
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Answer: 25 cm
Reason: The least distance of distinct vision is the minimum distance at which the eye can see objects clearly without strain, which is 25 centimeters for a normal adult.
(iii) Due to scattering of light, the color of the sky appears ______.
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Answer: Blue
Reason: Scattering of shorter wavelengths (like blue) by air molecules makes the sky appear blue during the day.
(iv) The S.I. unit of electric power is ______.
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Answer: Watt
Reason: Power = Voltage ร Current; the S.I. unit of power is the Watt (W), named after James Watt.
(v) The instrument used to measure potential difference is called ______.
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Answer: Voltmeter
Reason: A voltmeter is used to measure the potential difference (voltage) between two points in a circuit.
(vi) The rate of flow of electric charge is called ______.
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Answer: Electric current
Reason: Electric current is defined as the rate of flow of charge per unit time, measured in amperes.
Section 3 โ๏ธ Fill in the Blanks
(i) The disposal of the waste we generate is causing serious ______ problems.
โ
Answer: Environmental
Reason: Improper waste disposal leads to environmental issues such as land, air, and water pollution, which can harm human health and biodiversity.
(ii) The least distance of distinct vision for a young adult with normal vision is about ______.
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Answer: 25 cm
Reason: This is the minimum distance at which a normal human eye can see objects clearly without strain.
(iii) Scattering of light causes the ______ colour of sky.
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Answer: Blue
Reason: Due to Rayleigh scattering, the shorter wavelengths like blue are scattered more by air molecules, making the sky appear blue.
(iv) The S.I. Unit of electric power is ______.
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Answer: Watt
Reason: The watt (W) is the standard unit of power in the SI system, named after James Watt.
(v) The potential difference is measured by means of an instrument called ______.
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Answer: Voltmeter
Reason: A voltmeter is always connected in parallel across the circuit component to measure the voltage (potential difference).
(vi) At the time of short circuit, the current in the circuit ______.
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Answer: Increases rapidly
Reason: During a short circuit, resistance becomes very low, leading to a sudden and dangerous increase in electric current.
Section 4 โ True / False with Reason
(i) Two magnetic field lines intersect each other.
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Answer: False
Reason: Magnetic field lines never intersect. If they did, it would mean two directions of magnetic force at the same point, which is impossible.
(ii) Chlorofluorocarbons are used as fire extinguisher.
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Answer: False
Reason: CFCs (Chlorofluorocarbons) are mainly used as refrigerants and aerosols. Fire extinguishers commonly use carbon dioxide (COโ) or dry chemical powders, not CFCs.
(iii) Substances that are broken down by biological processes are said to be non-biodegradable.
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Answer: False
Reason: Such substances are actually called biodegradable, not non-biodegradable. Non-biodegradable substances cannot be broken down by biological processes.
(iv) Full form of D.N.A. is Deoxyribose Nucleic Acid.
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Answer: False
Reason: The correct full form of DNA is Deoxyribonucleic Acid, not “Deoxyribose Nucleic Acid”.
(v) Hydra can be cut into many pieces and each piece grows into a complete organism. This is known as regeneration.
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Answer: True
Reason: Hydra shows regeneration, a form of asexual reproduction where each part can regenerate into a full new organism.
(vi) Energy is absorbed in exothermic chemical reaction.
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Answer: False
Reason: In exothermic reactions, energy is released, not absorbed. Absorption of energy occurs in endothermic reactions.
Section 5 ๐ Match the Columns
| (A) | (B) | Answer with Explanation |
|---|---|---|
| (i) Marble | (c) CaCOโ | โ Marble is made of Calcium Carbonate (CaCOโ). |
| (ii) Vinegar | (d) Acetic acid | โ Vinegar contains Acetic Acid, which gives it the sour taste. |
| (iii) Bromine | (a) Liquid non-metal | โ Bromine is the only non-metal that is liquid at room temperature. |
| (iv) Benzene | (b) CโHโ | โ Benzene is a hydrocarbon compound with molecular formula CโHโ. |
| (v) Pair of sex chromosomes | (f) XX and (g) XY | โ XX = Female, XY = Male sex chromosomes. |
| (vi) Insulin | (e) Regulates blood sugar level | โ Insulin controls the amount of glucose in blood. |
Section 6 โ๏ธ One-word/Sentence Answers
(i) What is blood pressure?
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Answer: The pressure exerted by blood on the walls of blood vessels.
๐ Measured in mmHg โ normal is 120/80 mmHg.
(ii) Write the name of plant hormones which help in the growth of the stem.
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Answer: Auxins
๐ Auxins promote cell elongation in stems and roots.
(iii) Who worked out the main rules of such inheritance?
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Answer: Gregor Mendel
๐ Known as the Father of Genetics, he worked on pea plants.
(iv) Danger signal light are red in colour, why?
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Answer: Because red light has the longest wavelength and is visible from a distance.
๐ Hence, it is used for danger signals and stop signs.
(v) Write the commercial unit of electrical energy.
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Answer: Kilowatt hour (kWh)
๐ 1 kWh = 1000 watts used for 1 hour.
(vi) Write the full form of M.R.I.
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Answer: Magnetic Resonance Imaging
๐ MRI is a technique used in medical diagnosis to view internal organs.
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