Imp Questions For All Chapters – General Science Class 6

The Universe

Short Questions

1. What is the name of our galaxy?
Answer : Milky Way

2. Which galaxy is closest to the Milky Way?
Answer : Andromeda

3. What is the Sun?
Answer : A star

4. Which is the biggest planet in the solar system?
Answer : Jupiter

5. Which planet is called the Red Planet?
Answer : Mars

6. Which is the brightest planet?
Answer : Venus

7. Which planet has rings around it?
Answer : Saturn

8. Which planet is known as the Stormy Planet?
Answer : Jupiter

9. What is the temperature of the Sun’s surface?
Answer : Around 6000°C

10. What is a comet made of?
Answer : Ice and dust

11. What are asteroids?
Answer : Small rocky bodies in space

12. Which planet has the highest number of satellites?
Answer : Jupiter

13. What is the name of Earth’s satellite?
Answer : Moon

14. What is the shape of the Milky Way?
Answer : Spiral

15. What is a dwarf planet?
Answer : A small celestial body that orbits the Sun

Long Questions

1. What is a galaxy?
Answer : A galaxy is a huge group of stars, planets, dust, and gases bound together by gravity. Our galaxy, the Milky Way, contains billions of stars.

2. How do comets get their tails?
Answer : Comets are made of ice and dust. When they come close to the Sun, the heat melts the ice, forming a glowing tail that points away from the Sun.

3. What is the difference between meteors and meteorites?
Answer : A meteor is a space rock that burns up in Earth’s atmosphere, creating a bright streak in the sky. If it reaches Earth’s surface without burning completely, it is called a meteorite.

4. Why is Venus the hottest planet?
Answer : Venus has a thick atmosphere of carbon dioxide that traps heat from the Sun, making it the hottest planet in the solar system, even hotter than Mercury.

5. What are the types of stars?
Answer : Stars are of different types:

• Sun-like stars (similar to our Sun, e.g., Sirius)
• Red Giants (large and bright, e.g., Betelgeuse)
• Supernova (very bright and large)
• Binary stars (two stars orbiting each other)
• Variable stars (change brightness over time)

Question Answers For All Chapters – General Science Class 6

The Universe-Solutions

Exercise

1. Name these:
Answer – (a) Birthplace of stars – Nebula
(b) Biggest planet in the solar system – Jupiter
(c) The galaxy which is our neighbor – Andromeda
(d) Brightest planet in the solar system – Venus
(e) Planet with the largest number of satellites – Jupiter
(f) Planets without a single satellite – Mercury and Venus
(g) Planet with a rotation different from other planets – Venus (rotates from east to west)
(h) A celestial body that carries a tail along – Comet

2. Fill in the blanks:
Answer – (a) The group of galaxies of which our Milky Way is a part is called the Local Group.
(b) Comets are made of ice and dust.
(c) The planet Uranus appears as if it is rolling along its orbit.
(d) Jupiter is a stormy planet.
(e) The Pole Star is the best example of a Variable type of star.

3. Say if the statements given below are right or wrong. Rewrite the statements after correcting them.
Answer – (a) Venus is the planet closest to the sun. (Wrong – Mercury is the closest planet to the sun.)
(b) Mercury is called a stormy planet. (Wrong – Jupiter is called a stormy planet.)
(c) Jupiter is the biggest planet. (Right)

4. Answer the following.
(a) What is a special characteristic of the planet Mars ?
Answer –  Mars is called the Red Planet because its soil contains iron, giving it a reddish color. It also has the highest and longest mountain in the solar system, Olympus Mons.

(b) What are the types of galaxies ?
Answer –  Galaxies are of different types based on their shape:

• Spiral Galaxy (like the Milky Way)
• Elliptical Galaxy
• Barred Spiral Galaxy
• Irregular Galaxy

(c) Which celestial bodies does a galaxy include ?
Answer – A galaxy includes stars, planetary systems, nebulae, gas clouds, dust clouds, star clusters, and dead or newly born stars.

(d) Name the different types of stars.
Answer – The different types of stars are:
Sun-like stars (e.g., Sirius, Alpha Centauri)
Red Giants
Supernova
Binary or Twin Stars
Variable Stars (e.g., Pole Star)

(e) What are the types of comets and on what basis are they classified?
Answer – Comets are classified based on how long they take to revolve around the sun:

• Short-period comets (take less than 200 years)
• Long-period comets (take more than 200 years)

(f) What is the difference between meteors and meteorites ?
Answer –  Meteors are small space rocks that burn up in Earth’s atmosphere and appear as shooting stars.
Meteorites are meteors that do not burn up completely and reach the Earth’s surface.
(g) What are the characteristics of the planet Neptune ?
Answer –  Neptune is the 8th planet in the solar system.
It has extremely fast winds and very long seasons (about 41 years each).
It has 13 known satellites.

5. Match the following.

Imp Questions For All Chapters – General Science Class 6

Fun with Magnets

Short Questions

1. What is a magnet?
Answer : A material that attracts iron, nickel, and cobalt.

2. What is magnetism?
Answer : The force by which a magnet attracts objects.

3. Who discovered the first natural magnet?
Answer : A shepherd named Magnes.

4. What is a natural magnet called?
Answer : Magnetite or lodestone.

5. Name three magnetic materials.
Answer : Iron, cobalt, and nickel.

6. What happens when like poles of a magnet are brought close?
Answer : They repel each other.

7. What happens when opposite poles of a magnet are brought close?
Answer : They attract each other.

8. What is the shape of a bar magnet?
Answer : Rectangular.

9. Which direction does a freely suspended magnet always point?
Answer : North-South.

10. What is an electromagnet?
Answer : A temporary magnet made using electricity.

11. Which scientist discovered electromagnetism?
Answer : Michael Faraday.

12. Where is a magnetic strip used?
Answer : In ATM and credit cards.

13. What is induced magnetism?
Answer : When an object becomes magnetic near a magnet.

14. How does a Maglev train work?
Answer : It uses magnetic force to move.

15. How can a magnet lose its magnetism?
Answer : By heating, dropping, or breaking it.

Long Questions

1. What are the different shapes of magnets?
Answer : Magnets come in different shapes like bar magnet, horseshoe magnet, disc magnet, ring magnet, and cylindrical magnet. Each shape is used for different purposes.

2. How does a compass work?
Answer : A compass has a small magnetic needle that always points north-south. It helps travelers and sailors find directions.

3. What happens if we break a magnet into two pieces?
Answer : If a magnet is broken, each piece becomes a new magnet with a north and south pole. The poles can never be separated.

4. How are magnets useful in daily life?
Answer : Magnets are used in electric bells, speakers, compasses, MRI machines, and cranes to lift heavy iron objects. They are also used in computers and refrigerators.

5. What is an electromagnet and where is it used?
Answer : An electromagnet is a temporary magnet made by passing electricity through a coil around an iron core. It is used in doorbells, electric motors, and cranes for lifting heavy objects.

Notes For All Chapters – General Science Class 6

Fun with Magnets

1. What is a Magnet?

A magnet is a special material that attracts iron, nickel, and cobalt. This ability to attract metals is called magnetism.

2. Discovery of Magnets

A long time ago, a shepherd named Magnes in Greece found a rock that pulled his iron stick and shoes.
This rock was later named Magnetite and is a natural magnet.
The name “Magnet” may also come from a place in Greece called Magnesia.

3. Types of Magnets

There are two types of magnets:
1. Natural Magnets – Found in nature (e.g., Magnetite).
2. Artificial Magnets – Made by people and used in different shapes, such as:

• Bar Magnet (Rectangle shape)
• Horseshoe Magnet (U shape)
• Ring Magnet (Circular)
• Disc Magnet (Flat and round)

4. Properties of a Magnet

• A magnet has two poles: North Pole (N) and South Pole (S).
• Like poles repel (push away), and opposite poles attract (pull together).
• A freely hanging magnet always points in the North-South direction.
• If a magnet is broken, each piece becomes a new magnet with both poles.
• Magnets attract only magnetic materials like iron, nickel, and cobalt.

5. Magnetic and Non-Magnetic Materials

• Magnetic Materials – Objects that a magnet attracts (e.g., iron nails, steel, keys).
• Non-Magnetic Materials – Objects that a magnet does not attract (e.g., plastic, wood, paper).

6. Uses of Magnets

• In a compass to find directions.
• In cranes to lift heavy iron objects.
• In electric bells and speakers.
• In ATM and credit cards (Magnetic strip stores information).
• In trains (Maglev Trains) for fast travel using magnetic force.

7. Electromagnets

• A magnet made using electricity is called an electromagnet.
• It is made by wrapping copper wire around an iron nail and connecting it to a battery.
• When electricity is ON, the nail becomes a magnet.
• When electricity is OFF, the magnetism disappears.
• Electromagnets are used in cranes, doorbells, and electric motors.

8. Induced Magnetism

• If an iron object is placed near a magnet, it also becomes a magnet for a short time.
• This is called induced magnetism.
• But when the main magnet is removed, the object loses its magnetism.

9. How to Take Care of Magnets

• Do not heat magnets.
• Do not drop or hit them hard.
• Store magnets properly by keeping them with a piece of soft iron (Magnet Keeper).

Question Answers For All Chapters – General Science Class 6

Fun with Magnets-Solutions

Exercise

1. How will you do this?
(a) Determine whether a material is magnetic or non-magnetic:
Answer – Take a magnet and bring it near the material.
If the material sticks to the magnet, it is magnetic.
If it does not stick, it is non-magnetic.
(b) Explain that a magnet has a certain magnetic field:
Answer – Place some iron filings on a piece of paper.
Move a magnet under the paper.
The iron filings will arrange in a pattern showing the magnetic field.
(c) Find the north pole of a magnet:
Answer – Hang a bar magnet freely with a thread.
The end pointing towards the north is the north pole of the magnet.

2. Which magnet will you use?
Answer – (a) Iron is to be separated from trash: A strong bar magnet or an electromagnet.
(b) You are lost in a forest: A magnetic compass to find directions.
(c) A window shutter opens and shuts continuously in the wind: A magnet can be used to keep it in place.

3. Fill in the blanks with the appropriate word:
(a) If a bar magnet is hung by a thread tied at its center, its north pole becomes steady in the direction of the North pole of the Earth.
(b) If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, 3 bar magnets are formed, and a total of 6 poles are formed.
(c) There is repulsion between the like poles of a magnet, and attraction between its opposite poles.
(d) When a magnetic material is taken close to a magnet, the material acquires induced magnetism.
(e) If a magnet attracts a piece of metal, that piece must be made of magnetic material or iron.
(f) A magnet remains steady in a north-south direction.

4. Write the answers in your words:
(a) How is an electromagnet made?
Answer – Take an iron nail and a long insulated copper wire.
Wind the wire around the nail and connect both ends to a battery.
When electricity flows, the nail becomes a magnet.
When the battery is removed, the magnetism disappears.

(b) Write the properties of a magnet:
Answer – A magnet has two poles – North and South.
Like poles repel, and opposite poles attract.
A freely suspended magnet always points in the north-south direction.
If a magnet is broken, each piece forms a new magnet with both poles.
Magnets attract magnetic materials like iron, cobalt, and nickel.

(c) What are the practical uses of a magnet?
Answer – Used in compasses for navigation.
Used in electric bells and speakers.
Used in cranes to lift heavy iron objects.
Used in ATM cards, computers, and hard disks.
Used in Maglev trains for fast travel.

Imp Questions For All Chapters – General Science Class 6

Light and the Formation of Shadows

Short Questions

1. What is a luminous object?
Answer : An object that emits its own light.

2. Give one example of a luminous object.
Answer : The Sun.

3. What is a non-luminous object?
Answer : An object that does not emit its own light.

4. Give one example of a non-luminous object.
Answer : The Moon.

5. What is reflection?
Answer : Bouncing back of light from a surface.

6. Which object gives a clear reflection?
Answer : A mirror.

7. What are the three types of materials based on light passing through?
Answer : Transparent, translucent, and opaque.

8. Give an example of a transparent object.
Answer : Glass.

9. Give an example of an opaque object.
Answer : Wood.

10. What is a shadow?
Answer : A dark shape formed when an opaque object blocks light.

11. Which type of object forms a shadow?
Answer : Opaque object.

12. What is the shape of a shadow?
Answer : It depends on the shape of the object.

13. What is a pinhole camera?
Answer : A simple camera that forms an inverted image.

14. What happens when light passes through a prism?
Answer : It splits into seven colors.

15. What is needed for us to see an object?
Answer : Light must fall on the object and reflect into our eyes.

Long Questions

1. Why can we not see anything in total darkness?
Answer : We cannot see in total darkness because there is no light. Our eyes need light to reflect from objects and enter our eyes for us to see them.

2. Why does a shadow form?
Answer : A shadow forms when an opaque object blocks the path of light. Light travels in a straight line, and when something stops it, a dark shape appears on the opposite side.

3. How does a pinhole camera work?
A pinhole camera allows light to pass through a small hole, forming an inverted image on the opposite side. It works because light travels in straight lines.

4. What is the difference between a luminous and non-luminous object?
Answer : A luminous object produces its own light, like the sun or a bulb. A non-luminous object does not produce light but can reflect it, like the moon or a book.

5. What are the differences between transparent, translucent, and opaque objects?
Answer : Transparent objects allow all light to pass through (glass), translucent objects allow some light (frosted glass), and opaque objects do not allow light to pass through (wood).

Notes For All Chapters – General Science Class 6

Light and the Formation of Shadows

1. What is Light?

Light helps us see things around us.
It comes from sources like the sun, bulbs, candles, and torches.
Light travels in a straight line.

2. Types of Objects

Objects can be classified based on how they interact with light:

3. Reflection of Light

• When light bounces back from a shiny surface like a mirror, it is called reflection.
• This helps us see ourselves in a mirror.

4. Formation of Shadows

A shadow is formed when an opaque object blocks light.
Things needed to form a shadow:
A light source (like the sun or a bulb)
An opaque object (like a book or a person)
A surface (where the shadow appears)
Shadows are always formed on the opposite side of the light source.
The shape of the shadow depends on the shape of the object.

5. Pinhole Camera

A pinhole camera is a simple device that forms an inverted image of an object.
It works on the principle that light travels in a straight line.

6. Difference Between an Object and Its Reflection

A reflection is a mirror image of an object.
It appears reversed (left side looks like the right side).

7. Natural and Artificial Light Sources

• Natural sources – Sun, stars, fireflies
• Artificial sources – Bulb, torch, candle

Question Answers For All Chapters – General Science Class 6

Light and the Formation of Shadows

Exercise

1. Choose an appropriate word and fill in the blanks.
Answer – 
(a) A star is a natural source of light.
(b) A candle is an artificial source of light.
(c) When light passes through a prism, it gets separated into seven colours.
(d) The image obtained in the pinhole camera is inverted.
(e) A shadow is formed when an opaque object comes in the way of light.
(f) When a transparent object comes in the way of light, light passes through it.

2. Write whether of the following objects are luminous or non-luminous.
Answer –

3. Match the following.
Answer – 

4. Write the answers to the following.
(a) What things are necessary for the formation of a shadow?
Answer – For a shadow to form, three things are necessary:
A light source (like the sun, a bulb, or a torch).
An opaque object (an object that blocks light).
A surface (like the ground or a wall) where the shadow appears.
(b) When can an object be seen?
Answer – An object can be seen when light falls on it and reflects into our eyes. If there is no light, we cannot see anything.
(c) What is a shadow?
Answer – A shadow is a dark shape formed when an opaque object blocks the path of light. It is always formed on the opposite side of the light source.

Imp Questions For All Chapters – General Science Class 6

Sound

Short Questions

1. What is necessary for sound production?
Answer : Vibration

2. What is the source of a sound?
Answer : An object that vibrates

3. What is the unit of sound intensity?
Answer : Decibel (dB)

4. What is the science of sound called?
Answer : Acoustics

5. Which organ helps us hear sound?
Answer : Ear

6. What happens when vibrations stop?
Answer : Sound stops

7. Which part of the ear vibrates to hear sound?
Answer : Eardrum

8. What is noise?
Answer : Unpleasant or unwanted sound

9. What is noise pollution?
Answer : Too much loud and harmful noise

10. Name a place where noise is prohibited.
Answer : Hospitals

11. How does sound travel?
Answer : In waves

12. Which medium carries sound best?
Answer : Solid

13. Which musical instrument uses stretched strings to make sound?
Answer : Sitar

14. What happens when you stretch and pluck a rubber band?
Answer : It vibrates and makes sound

15. Which sound is soft – whispering or shouting?
Answer : Whispering

Long Questions

1. What is vibration? Give an example.
Answer : Vibration is the back-and-forth movement of an object. For example, when we pluck a guitar string, it vibrates and produces sound.

2. How does sound travel through solids?
Answer : Sound travels faster in solids than in air. For example, if you put your ear on a table and someone taps on it, you will hear the sound clearly.

3. What are the effects of noise pollution?
Answer : Noise pollution can cause stress, irritation, lack of concentration, and even hearing problems. It disturbs people and animals.

4. How can we reduce noise pollution?
Answer : We can reduce noise pollution by avoiding unnecessary honking, lowering TV or radio volume, and planting more trees to absorb sound.

5. What is the function of the eardrum?
Answer : The eardrum vibrates when sound waves reach it. These vibrations are sent to the brain, which helps us hear the sound.