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Basic Science (Daily Life Science)

Q: Which gas do plants primarily absorb from the atmosphere for photosynthesis?

Carbon Dioxide. Plants take in carbon dioxide from the air through tiny pores on their leaves to perform photosynthesis, converting it into food (glucose) and releasing oxygen.

Q: What causes the twinkling of stars?

Atmospheric refraction of starlight.. The Earth's atmosphere is made of layers of air with different temperatures and densities. As starlight passes through these turbulent layers, it bends slightly, causing the star to appear to 'twinkle'.

Q: What makes a hot air balloon float?

The hot air inside the balloon is lighter than the cooler air outside.. Heating the air inside the balloon makes it less dense (lighter) than the cooler air outside. This difference in density creates an upward buoyant force, causing the balloon to float.

Q: Which part of the eye is responsible for color vision?

Cones. The human retina has two types of photoreceptor cells: rods and cones. Rods are responsible for vision in low light (night vision), while cones are responsible for sharp vision and color perception.

Q: Why do we add salt to water when boiling eggs?

To increase the boiling point of water and prevent cracking.. Adding salt to water increases its boiling point (makes it boil at a slightly higher temperature) and also helps to prevent eggshells from cracking, as the salt water can quickly seal any small cracks that form.

Free Content10 MCQs

Introduction

Ever wondered why the sky is blue, or how a simple fan works to cool you down? Basic science is all around us, explaining these everyday wonders! It's not just for labs; it helps us understand everything from why food cooks to how our bodies work. Learning basic science helps you make sense of the world and also scores you points in exams like SSC and Banking!

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Understanding the World

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Short Tricks

Save time in exam

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Short Tricks

Learn these once — solve in seconds in the exam hall

5 tricks

⚡01

Shiny vs. Dull Heat Trick

Shiny surfaces (like polished metal) are good at reflecting heat and bad at absorbing it. That's why cool drinks often come in shiny cans. Dull or dark surfaces are good at absorbing heat and bad at reflecting it. Think of a black t-shirt on a sunny day!

✅ Example:If you want to keep your water cool in summer, use a shiny flask. If you want to warm water using sunlight, paint the container black.

PhysicsHeatDaily Life

⚡02

My Very Educated Mother Just Served Us Noodles

To remember the order of planets from the Sun, use this simple sentence! Each first letter stands for a planet: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

✅ Example:My Very Educated Mother Just Served Us Noodles -> Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

ScienceAstronomyMnemonic

⚡03

Hot or Not Wire Check

A simple way to guess if something is a good electrical conductor (lets electricity flow) or an insulator (blocks electricity) is to think if it's generally a metal. Most metals (like copper, iron) are good conductors. Non-metals (like plastic, wood, rubber) are usually good insulators.

✅ Example:If you see a bare copper wire, it's a conductor. If it's covered in plastic, the plastic is an insulator, keeping you safe.

PhysicsElectricityMaterial Science

⚡04

Rust Needs Air and Water

For iron to rust (turn reddish-brown), it needs two things: oxygen from the air and water (or moisture). If you keep iron away from either of these, it won't rust. That's why painting metal protects it!

✅ Example:A metal gate left out in the rain will rust. A metal spoon kept perfectly dry indoors won't.

ChemistryCorrosionDaily Life

⚡05

Red Blood, Iron Power

Your blood is red because it contains something called haemoglobin. This haemoglobin has iron in it! When this iron mixes with oxygen, it turns bright red. It's like a tiny rusting process, but a healthy one!

✅ Example:Think of how a rusty nail is reddish; that's iron reacting with oxygen. In your blood, haemoglobin with iron binds oxygen and makes blood red.

BiologyHuman BodyChemistry

Full Explanation

Science is Everywhere!

Look around you! Everything, from the tiny ant carrying food to the huge sun shining brightly, involves science. Basic science helps us understand why things happen and how things work. It’s not just for scientists in white coats; it’s for everyone, every day!

Physics Around Us

Physics is like the rulebook for how things move and interact.

Light and Sight: Have you seen a rainbow? That's light splitting into colors. Why is the sky blue? Because tiny bits in the air scatter blue light more! When you look in a mirror, you see your reflection because light bounces off its smooth surface.
Sound: How do you hear your friend call your name? Sound travels in waves through the air to your ears. An echo happens when sound waves hit a wall and bounce back to you.
Force and Motion: Why does an apple fall from a tree? Because of gravity, a pulling force from the Earth. When you walk, friction (a rubbing force) between your shoes and the ground stops you from slipping. Even a simple fan uses electric power to move blades, pushing air to cool you.
Electricity: From your phone charger to the lights in your room, electricity is flowing. It’s the movement of tiny particles that gives power to our gadgets.

Chemistry in Our Kitchen & Home

Chemistry is all about what things are made of and how they change.

Cooking Magic: When your mom bakes a cake, the ingredients mix and heat changes them. This is a chemical reaction! Why does milk turn into curd? Because of tiny living things (bacteria) that change the milk chemically.
Cleaning Agents: Soaps and detergents help us clean dishes. They have special chemicals that mix with dirt and grease, making them easy to wash away with water.
Rusting: Leave an iron nail outside for a few days, and it might turn reddish-brown. This is called rusting. It happens when iron reacts with oxygen from the air and water.
Batteries: Your phone battery uses chemicals inside to store energy. When you use your phone, these chemicals react to produce electrical energy.

Biology & Our Bodies

Biology is the study of living things, including us!

Digestion: When you eat food, your body breaks it down into smaller parts to get energy. This process is called digestion.
Breathing: We breathe in oxygen, which our body uses, and breathe out carbon dioxide. Plants do the opposite to make food!
Plants Making Food: Plants are amazing! They use sunlight, water, and carbon dioxide to make their own food (sugar) and release oxygen. This process is called photosynthesis.
Tiny Life: There are tiny living things called microbes all around us. Some are good, like the ones that help make bread or curd. Others can cause diseases.

Understanding these basic science concepts helps us appreciate the world more and prepares us for competitive exams where such questions are common!

Formulas & Rules

Law of Gravity

Every object attracts every other object with a force.

Photosynthesis

Carbon Dioxide + Water + Sunlight → Glucose (Food) + Oxygen

Law of Reflection

Angle of incidence = Angle of reflection

Principle of Buoyancy

An object submerged in a fluid experiences an upward force equal to the weight of the fluid displaced.

States of Matter Rule

Solid (fixed shape/volume) → Liquid (fixed volume, takes container shape) → Gas (no fixed shape/volume)

Comparison

Property	Solid	Liquid	Gas
Shape	Fixed	Takes shape of container	Takes shape of container
Volume	Fixed	Fixed	No fixed volume
Particles	Very close	Close	Far apart
Movement	Vibrate in place	Slide past each other	Move freely and fast

Solved Examples

Example 1

Q: Why does a ball thrown upwards always come back down to Earth?

Solution:

Earth has gravity, which is a pulling force.
This force pulls everything towards its center.
When you throw a ball up, gravity constantly pulls it down.
Eventually, the upward push runs out, and gravity wins, bringing the ball back.

Answer: Due to Earth's gravity, which pulls all objects towards its center.

Example 2

Q: How do plants prepare their own food?

Solution:

Plants have tiny green parts called chlorophyll (क्लोरोफिल).
They use sunlight, water from roots, and carbon dioxide from the air.
Chlorophyll helps mix these ingredients to make sugar (food) and release oxygen.
This special process is called photosynthesis (प्रकाश संश्लेषण).

Answer: Plants make their food through photosynthesis, using sunlight, water, and carbon dioxide.

Example 3

Q: When you put a pencil in a glass of water, why does it look bent or broken at the water line?

Solution:

Light travels in a straight line.
When light passes from one transparent thing (like air) to another (like water), it changes speed and direction. This bending is called refraction (अपवर्तन).
Our eyes see the light that has bent, making the pencil appear bent.

Answer: This happens due to the refraction of light, where light bends as it passes from air into water.

Example 4

Q: Why can you hold a hot tea cup with a cloth but not with your bare hand?

Solution:

Heat always moves from a hotter place to a cooler place.
Your bare hand is cooler than the hot cup, so heat would quickly move to your hand, causing a burn.
A cloth is a poor conductor of heat (an insulator - ऊष्मारोधी).
It slows down the transfer of heat, protecting your hand.

Answer: Cloth acts as a heat insulator, slowing down heat transfer from the hot cup to your hand, unlike your bare skin which is a good conductor.

🌍 Real-World Scenarios

🍳The Boiling Mystery

Your mom is boiling water for pasta. She notices that even if she increases the flame a lot, the water temperature doesn't go above 100°C. Why?

📱Phone Power Play

Your phone battery uses chemical energy. When you plug it in, what kind of energy is used to refill the chemical energy stores?

🏊Floating Friend

You and your friend are at the pool. You can float easily, but your friend struggles. Your friend weighs more. How can someone heavier float more easily?

🚗Airbag Hero

In a car crash, airbags pop out incredibly fast. How do they inflate so quickly, in just milliseconds?

Tricky Questions

You see lightning before you hear thunder. Which of the following is the *main* reason for this?

Why do ice cubes float in water?

Which process allows plants to release water vapor into the atmosphere?

Why does a doctor use a stethoscope to listen to your heartbeat?

Practice MCQ Quiz

1Which gas do plants primarily absorb from the atmosphere for photosynthesis?

2What causes the twinkling of stars?

3What makes a hot air balloon float?

4Which part of the eye is responsible for color vision?

5Why do we add salt to water when boiling eggs?

6The main component of natural gas is?

7Which instrument is used to measure atmospheric pressure?

8What is the primary function of white blood cells (WBCs) in the human body?

9Why does a sharp knife cut better than a blunt knife?

10What is responsible for the sour taste of curd (yogurt)?

⚡01Shiny vs. Dull Heat Trick

✅ If you want to keep your water cool in summer, use a shiny flask. If you want to warm water using sunlight, paint the container black.

PhysicsHeatDaily Life

⚡02My Very Educated Mother Just Served Us Noodles

To remember the order of planets from the Sun, use this simple sentence! Each first letter stands for a planet: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

✅ My Very Educated Mother Just Served Us Noodles -> Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

ScienceAstronomyMnemonic

⚡03Hot or Not Wire Check

✅ If you see a bare copper wire, it's a conductor. If it's covered in plastic, the plastic is an insulator, keeping you safe.

PhysicsElectricityMaterial Science

⚡04Rust Needs Air and Water

✅ A metal gate left out in the rain will rust. A metal spoon kept perfectly dry indoors won't.

ChemistryCorrosionDaily Life

⚡05Red Blood, Iron Power

✅ Think of how a rusty nail is reddish; that's iron reacting with oxygen. In your blood, haemoglobin with iron binds oxygen and makes blood red.

BiologyHuman BodyChemistry

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Table of Contents

Introduction In Short Full Explanation Formulas Comparison Solved Examples Tricky Questions Practice Quiz

Quick Formulas

Law of Gravity

Every object attracts every other object with a force.

Photosynthesis

Carbon Dioxide + Water + Sunlight → Glucose (Food) + Oxygen

Law of Reflection

Angle of incidence = Angle of reflection

+2 more formulas below

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Property

Solid

Liquid

Gas

Shape

Fixed

Takes shape of container

Volume

Fixed

No fixed volume

Particles

Very close

Far apart

Movement

Vibrate in place

Slide past each other

Move freely and fast