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🎯 Exam Preparation Kit
Science Exam Preparation
English 46 leveled MCQs Free
Shared by a Veda learner · Generated with Veda AI
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Sample questions with model answers
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5 marks Long answer
(a) Why should curd and sour substances not be kept in brass and copper vessels?
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They react with metals, causing harmful compounds.
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5 marks Long 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; test with a lit match for a 'pop' sound.
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5 marks Long answer
Write a short note on Bleaching powder.
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Calcium hypochlorite, used for bleaching and disinfecting.
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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.
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5 marks Long answer
Explain the circulation path of blood in human heart.
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Blood flows from body to right atrium, to right ventricle, to lungs, to left atrium, to left ventricle, and back to body.
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5 marks Long answer
Explain human respiratory system.
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Involves lungs, trachea, bronchi; facilitates 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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Diagram shows cornea, lens, retina; functions include focusing light.
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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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Caused by elongated eyeball; corrected with concave lens.
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5 marks Long 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 energy flow; e.g., grass (producer) → rabbit (primary consumer) → fox (secondary consumer).
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5 marks Long answer
(b) What is ozone and how does it affect any ecosystem?
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Ozone is O3, protects from UV radiation; affects health and climate.
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3 marks Medium answer
What is combination reaction? Explain it with examples.
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A reaction where two or more substances combine to form one product; e.g., A + B → AB.
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3 marks Medium answer
What is corrosion? Mention two ways to prevent corrosion.
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Corrosion is the deterioration of metals; prevent by painting or galvanizing.
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3 marks Medium answer
Explain the importance of pH in food digestion.
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pH affects enzyme activity in digestion.
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3 marks Medium 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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3 marks Medium answer
(b) Show the formation of Na2O and MgO by the transfer of electrons.
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Na → Na⁺ + e⁻; O + 2e⁻ → O²⁻.
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3 marks Medium answer
(c) What are the ions present in Na2O and MgO compounds.
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Na2O contains Na⁺ and O²⁻; MgO contains Mg²⁺ and O²⁻.
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3 marks Medium answer
Explain thermit process.
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A method for welding using aluminum powder and iron oxide.
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3 marks Medium answer
Explain reflex arc. Explain spinal reflex.
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Reflex arc is a neural pathway; spinal reflex is an automatic response.
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3 marks Medium answer
Explain: Human brain.
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The control center of the nervous system, responsible for processing information.
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3 marks Medium 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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Image position at 1.5m, virtual and diminished.
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3 marks Medium answer
Name the type of mirror used in the following situations: (a) Headlights of a car
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Concave mirror.
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3 marks Medium answer
(b) Rear-view mirror of a vehicle
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Convex mirror.
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3 marks Medium answer
(c) Solar furnace
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Concave mirror.
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2 marks Short answer
Why should a magnesium ribbon be cleaned before burning in air?
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To remove the oxide layer for proper combustion.
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2 marks Short answer
Balance the following chemical equations: (a) NaOH + H2SO4 → Na2SO4 + H2O
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2NaOH + H2SO4 → Na2SO4 + 2H2O.
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2 marks Short answer
Balance the following chemical equations: (b) NaCl + AgNO3 → AgCl + NaNO3
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NaCl + AgNO3 → AgCl + NaNO3.
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2 marks Short answer
What is meant by olfactory indicator? Give examples.
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Substances that change smell in acidic or basic solutions; e.g., onion juice.
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2 marks Short answer
What is an alloy? Give an example.
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A mixture of metals; e.g., bronze.
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2 marks Short answer
Give reason: Platinum, gold and silver are used to make jewellery.
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They are non-reactive and have aesthetic appeal.
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2 marks Short answer
Explain the structure of a nephron.
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Functional unit of kidney; consists of glomerulus and tubules.
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2 marks Short answer
Which signals will get disrupted in case of a spinal cord injury?
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Nerve signals between the brain and body.
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2 marks Short answer
Why are some patients of diabetes treated by giving injections of insulin?
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To regulate blood sugar levels.
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2 marks Short answer
State the uses of concave mirror.
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Used in telescopes, shaving mirrors, and flashlights.
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2 marks Short answer
(a) Define 1 dioptre of power of a lens.
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Power of a lens with a focal length of 1 meter.
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2 marks Short answer
(b) Find the power of a concave lens of focal length 2m.
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Power = -0.5 D.
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2 marks Short answer
What is scattering of light? Write two examples.
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Scattering is the redirection of light; e.g., blue sky, red sunset.
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2 marks Short answer
Write differences between: Biodegradable waste and Non Biodegradable waste.
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Biodegradable waste decomposes naturally; non-biodegradable does not.
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2 marks Short answer
What are the problems caused by the non-biodegradable wastes that we generate?
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They pollute the environment and harm wildlife.
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1 marks Short answer
Which metals will melt, if you keep them on your palm?
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Gallium and Indium.
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1 marks Short answer
On which part of cell Aerobic and Anaerobic respiration take place?
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Aerobic respiration occurs in mitochondria; Anaerobic occurs in cytoplasm.
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1 marks Short answer
State the spherical mirror formula.
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1/f = 1/v + 1/u.
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1 marks Short answer
What are light sensitive cells?
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Photoreceptors in the retina.
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1 marks Short answer
Match the following: Growth hormone
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b. Pituitary gland.
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1 marks Short answer
Match the following: Estrogen
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c. Ovary.
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1 marks Short answer
Match the following: Second trophic level
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b. Primary consumers.
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1 marks Short answer
Match the following: Third trophic level
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c. Secondary consumers.
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