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PhysicsClass 10CBSE

What is blood pressure?

Blood pressure is the force exerted by blood against the walls of arteries, measured in mmHg.Normal: 120/80 mmHg (systolic / diastolic)Systolic = force during heartbeat; Diastolic = force between beats.High blood pressure = hypertension strains arteries and heart.<

PhysicsClass 10CBSE

What is reflex action?

A reflex action is a rapid, automatic response to a stimulus controlled by the spinal cord no conscious brain processing needed.Reflex arc: Receptor → Sensory neuron → Spinal cord → Motor neuron → EffectorExample: Pulling hand from hot object before feeling pain. Brain receives information after the reflex occurs.A reflex action is an involuntary, instant response controlled by the spinal cord through a reflex arc, bypassing consci

PhysicsClass 10CBSE

What is the difference between reflex action and walking?

FeatureReflex ActionWalkingControlSpinal cordBrain (cerebellum + cerebrum)Conscious thoughtNot requiredRequired initiallySpeedExtremely fastModeratePurposeProtection from sudden harmPurposeful movementReflex actions are involuntary and immed

MathematicsClass 10CBSE

What is a composite number? Give examples.

A composite number is a natural number greater than 1 with more than two factors divisible by numbers other than just 1 and itself.Smallest composite number: 4All even numbers greater than 2 are composite.1 is neither prime nor composite.Number</

MathematicsClass 10CBSE

What is an irrational number? Give examples.

An irrational number is a real number with a non-terminating, non-repeating decimal expansion cannot be expressed as p/q.NumberValue (approx.)√21.41421356...√31.73205080...π3.14159265...e2.71828182...Note: √4 = 2 is rational. Only square roots of non-perfect squ

MathematicsClass 10CBSE

What are even numbers?

Even numbers are integers exactly divisible by 2 they leave no remainder when divided by 2.General form: 2n (where n is any integer)Zero is even. Negative even numbers exist (−2, −4, ...).Always end in: 0, 2, 4, 6, or 8Even + Even = Even; Even × Odd = Even; Even + Odd = Odd.<

MathematicsClass 10CBSE

What are natural numbers?

Natural numbers are the basic counting numbers: 1, 2, 3, 4, 5, ...Symbol: NAlways positive, never include zero (in standard school definition), no fractions or decimals.Infinite no largest natural number.Hierarchy: N ⊂ Whole (W) ⊂ Integers (Z) ⊂ Rational (Q) ⊂ Real (R)<

MathematicsClass 10CBSE

What is the greatest 7-digit number?

The greatest 7-digit number is 9,999,999 (Nine million, nine hundred and ninety-nine thousand, nine hundred and ninety-nine).Reasoning: Place the largest digit (9) in all seven positions.PositionDigitValueTen Lakhs990,00,000Lakhs99,00,000Ten Thousands990,000Thousand

MathematicsClass 10CBSE

What is the angle formed by one-fourth of a revolution?

One-fourth of a revolution = 90° (a right angle).Full revolution = 360°360° ÷ 4 = 90°FractionAngle1 revolution360°1/2180° (straight angle)1/490° (right angle)1/845°<tr

MathematicsClass 10CBSE

What is the value of 3³?

3³ = 273³ = 3 × 3 × 3 = 9 × 3 = 27"Cubed" because 3³ = volume of a cube with side 3.3¹ = 3; 3² = 9; 3³ = 273⁴ = 81

GeneralClass 10CBSE

What are renewable resources?

Renewable resources are naturally replenished on a human timescale and will not run out as long as they are not overused.Examples: Solar energy, wind energy, hydroelectric power, biomass, geothermal energy, tidal energy.Using renewable resources reduces greenhouse gas emissions and slows climate change. However, forests are renewable only if replanted responsibly.Renewable resources naturally replenish themselves solar, wind, water, biomass forming the ba

Social StudiesClass 10CBSE

What are non-renewable resources?

Non-renewable resources exist in fixed quantities and take millions of years to form essentially gone forever once used.Examples: Fossil fuels (coal, petroleum, natural gas), nuclear fuels (uranium), mineral ores.Fossil fuels took 300–400 million years to form.Currently supply ~80% of global energy.<li data-list-item-id="e38200

GeneralClass 10CBSE

What is green energy?

Green energy is energy from natural, environmentally friendly sources producing little to no greenhouse gas emissions.Examples: Solar, wind, hydropower, geothermal, tidal and wave energy.Benefits: Reduces fossil fuel dependence, cuts CO₂ emissions, creates clean energy jobs, provides long-term energy security.Green energy comes from clean, natural sources with minimal environmental impact, offering a sustainable alternative to fossil-fuel

Political ScienceClass 10CBSE

What is soil erosion?

Soil erosion is the removal and displacement of the topsoil layer by water, wind, or human activities.Causes: Water erosion, wind erosion, deforestation, overgrazing, poor farming practices.Consequences: Loss of fertile land, increased flooding, river sedimentation, desertification.Prevention: Afforestation, contour ploughing, cover crops, terracing.Soil erosion strips away fertile topsoil, threatening agriculture

Social StudiesClass 10CBSE

What was the Chipko Movement?

The Chipko Movement was a grassroots environmental movement in India that began in 1973 in Uttarakhand. Villagers primarily women literally hugged trees to prevent commercial logging. "Chipko" means "to hug/cling" in Hindi.Led by Gaura Devi in Reni village; philosophy promoted by Sunderlal Bahuguna.<li data-list-item-id="eebf947cfc9769201f96

BiologyClass 10CBSE

What is crop rotation, and why is it important?

Crop rotation is the practice of growing different crops in the same field in a planned sequence across seasons or years.Why it matters:Soil fertility: Different crops use different nutrients, legumes fix atmospheric nitrogen.Pest/disease control: Breaks pest life cycles without chemicals.

BiologyClass 10CBSE

What is animal husbandry?

Animal husbandry is the scientific care, breeding, and management of livestock for useful products and services.Animals covered: Cattle, buffaloes, pigs, poultry, sheep, goats, fish (aquaculture), bees (apiculture), silkworms (sericulture).Practices: Selective breeding, balanced nutrition, vaccination, clean housing, hygienic product collection.Animal husbandry is the scientific management of livestock for food, labour, and other products

BiologyClass 10CBSE

What is a food chain?

A food chain shows how energy and nutrients transfer from one organism to another through feeding relationships always starting with a producer.Grass → Grasshopper → Frog → Snake → Eagle (Producer) → (Primary) → (Secondary) → (Tertiary) → (Apex) Each step = a trophic levelOnly ~10% of energy pas

BiologyClass 10CBSE

What is a decomposer?

A decomposer breaks down dead organic matter into simpler inorganic substances, returning nutrients to the soil.Examples: Bacteria, fungi (mushrooms, moulds)Break down proteins and cellulose into CO₂, water, and minerals.Essential for completing nutrient cycles

BiologyClass 10CBSE

What is an autotroph?

An autotroph ("self-feeder") produces its own food from simple inorganic substances using an external energy source.Photoautotrophs: Use sunlight (plants, algae, cyanobacteria — via photosynthesis).Chemoautotrophs: Use chemical energy (certain deep-sea bacteria).<li data-list-item-id="e6eb30cc93bb6323e221b5d93d81c0c24

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