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🎯 Exam Preparation Kit
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English 21 leveled MCQs Free
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Sample questions with model answers
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5 marks Long answer
A convex mirror used for rear-view on an automobile has a radius of curvature of 3.00m. If a bus is located at 5.00m from this mirror, find the position, nature and size of the image.
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Using the mirror formula, the image position is at 1.5m behind the mirror, the nature is virtual, and the size is reduced.
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5 marks Long answer
Explain the process of nutrition in Amoeba.
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Amoeba uses phagocytosis to engulf food particles, forming a food vacuole where digestion occurs.
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5 marks Long answer
Explain the circulation path of blood in human heart.
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Blood circulates through the heart via the right atrium, right ventricle, lungs, left atrium, left ventricle, and out to the body.
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5 marks Long answer
Explain human respiratory system.
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The human respiratory system consists of the nasal cavity, trachea, bronchi, and lungs, facilitating gas exchange.
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5 marks Long answer
Draw a neat and labeled diagram of human eye. Explain its different parts with functions.
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The human eye diagram includes the cornea, lens, retina, and pupil, each serving key roles in vision.
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5 marks Long answer
State causes of myopia. How is this defect corrected? Draw suitable diagram to show it.
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Myopia is caused by an elongated eyeball; it is corrected using concave lenses.
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4 marks Medium answer
(a) Why should curd and sour substances not to be kept in brass and copper vessels?
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Curd and sour substances can react with brass and copper, leading to the formation of harmful compounds.
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4 marks Medium answer
(b) Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
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Hydrogen gas is liberated; e.g., Zn + HCl → ZnCl$_2$ + H$_2$. It can be tested using a litmus paper or a burning splint.
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4 marks Medium answer
(a) What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
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Trophic levels represent the position of organisms in a food chain; e.g., Grass (1st) → Rabbit (2nd) → Fox (3rd).
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4 marks Medium answer
(b) What is ozone and how does it affect any ecosystem?
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Ozone (O$_3$) protects ecosystems by absorbing harmful UV radiation, preventing damage to living organisms.
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3 marks Medium answer
What is combination reaction? Explain it with examples.
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A combination reaction is a chemical reaction where two or more substances combine to form a single product, e.g., A + B → AB.
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3 marks Medium answer
Explain the importance of pH in food digestion.
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pH is crucial in digestion as it affects enzyme activity; for example, stomach acid (pH 1.5-3.5) aids in protein digestion.
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3 marks Medium answer
(b) Show the formation of Na$_2$O and MgO by the transfer of electrons.
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Na$_2$O forms by 2Na → 2Na$^+$ + O + 2e$^-$; MgO forms by Mg → Mg$^{2+}$ + O + 2e$^-$.
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3 marks Medium answer
Explain thermit process.
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The thermit process involves a reaction between aluminum powder and metal oxides, producing molten metal and aluminum oxide.
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3 marks Medium answer
Explain reflex arc. Explain spinal reflex.
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A reflex arc is the neural pathway that mediates a reflex action; spinal reflex is an involuntary response to stimuli processed in the spinal cord.
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3 marks Medium answer
Explain : Human brain.
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The human brain is the control center of the body, responsible for processing sensory information, coordinating movement, and enabling cognition.
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2 marks Short answer
What is corrosion? Mention two ways to prevent corrosion.
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Corrosion is the gradual destruction of materials, usually metals, due to chemical reactions; prevention methods include galvanization and painting.
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2 marks Short answer
(a) Write the electron-dot structures for sodium, oxygen and magnesium.
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Sodium: Na•, Oxygen: :O:, Magnesium: Mg•.
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2 marks Short answer
(c) What are the ions present in Na$_2$O and MgO compounds.
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Na$_2$O contains Na$^+$ and O$^{2-}$ ions; MgO contains Mg$^{2+}$ and O$^{2-}$ ions.
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2 marks Short answer
Name the type of mirror used in the following situations :- (a) Headlights of a car (b) Rear-view mirror of a vehicle (c) Solar furnace.
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a) Concave mirror; b) Convex mirror; c) Concave mirror.
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2 marks Short answer
Write a short note on Bleaching powder.
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Bleaching powder (Ca(OCl)$_2$) is used as a bleaching agent and disinfectant, effective against bacteria and stains.
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