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All questions of Class 6 for UPSC CSE Exam
The part of a banana plant not used as food is- a)flower
- b)fruit
- c)root
- d) inner stem
Correct answer is option 'C'. Can you explain this answer?
The part of a banana plant not used as food is
a)
flower
b)
fruit
c)
root
d)
inner stem
 | Aarya Joshi answered |
The parts of the banana plant that you can eat are inner stem, flower, raw banana and ripe banana fruit.
Can you explain the answer of this question below:Green plants prepare their own food, hence they are called as
- A:
Decomposers
- B:
Autotrophs
- C:
Parasites
- D:
Heterotrophs
The answer is b.
Green plants prepare their own food, hence they are called as
Decomposers
Autotrophs
Parasites
Heterotrophs
 | Kunal Das answered |
Green plants have the ability to prepare their own food and this is the reason why they are called autotrophs.
The chlorophyll which is present in the leaves is the main reason for the production of food in the plants and it is the reason for the greenery of the leaves too.
Which one is not a function of food:- a)Repair body parts
- b)Gives us energy
- c)Help in growth
- d)Prepare protein
Correct answer is 'D'. Can you explain this answer?
Which one is not a function of food:
a)
Repair body parts
b)
Gives us energy
c)
Help in growth
d)
Prepare protein
 | Sneha Jha answered |
As we all know that food help us to repair the damage part of our body, Gives us food, Help in growth. But as we know that protein is synthesis in our body not prepare.
Which one of the following is not an example of natural fibre?- a)Rayon
- b)Cotton
- c)Wool
- d)Silk
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is not an example of natural fibre?
a)
Rayon
b)
Cotton
c)
Wool
d)
Silk
 | Rithika Roy answered |
Silk, cotton and wood are obtained from natural sources either plant or animal but rayon is a synthetic fibre.
Curd is formed by the action of- a)Protozoa
- b)Bacteria
- c)Fungus
- d)Algae
Correct answer is option 'B'. Can you explain this answer?
Curd is formed by the action of
a)
Protozoa
b)
Bacteria
c)
Fungus
d)
Algae
 | Rajesh Khatri answered |
The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. Milk that has been left to sour (raw milk alone or pasteurized milk with added lactic acid bacteria) will also naturally produce curds, and sour milk cheeses are produced this way.
Q.Silkworms feeds on leaves ofa)Guavab)Mulberryc)Bananad)MangoCorrect answer is option 'B'. Can you explain this answer?
 | Kavya Rane answered |
Silkworms can ONLY survive on mulberry leaves (genus Morus), sometimes Osage orange (Maclura pomifera) or silkworm food, which is made from mulberry leaves. Your worms may eat other types of vegetation, such as lettuce leaves, but it will kill them.
Which of the following can not be used for composting?- a)Plastic bag
- b)Rotten banana
- c)Vegetable peels
- d)Fruits peels
Correct answer is option 'A'. Can you explain this answer?
Which of the following can not be used for composting?
a)
Plastic bag
b)
Rotten banana
c)
Vegetable peels
d)
Fruits peels
 | Snehal Kaur answered |
Fruit peels, vegetable peels and rotten banana are used for compositing but plastic bag cannot be used for composting.
Pulses are rich source of- a)Minerals
- b)Roughages
- c)Proteins
- d)Fibre
Correct answer is 'C'. Can you explain this answer?
Pulses are rich source of
a)
Minerals
b)
Roughages
c)
Proteins
d)
Fibre
 | Aruna Singh answered |
Pulses are a low fat source of protein with high levels of protein and fibre.
Pulses also contain important vitamins and minerals like iron, potassium and folate.
Select odd from the following- a)Spade
- b)Eraser
- c)Tawa
- d)Pressure cooker
Correct answer is option 'B'. Can you explain this answer?
Select odd from the following
a)
Spade
b)
Eraser
c)
Tawa
d)
Pressure cooker
 | Prachi Singh answered |
All the things belong to kitchen except eraser
Choose the opaque materials form the following- a)Thin sheet of plastic
- b)Glass container.
- c)Wooden door
- d)Clear water
Correct answer is 'C'. Can you explain this answer?
Choose the opaque materials form the following
a)
Thin sheet of plastic
b)
Glass container.
c)
Wooden door
d)
Clear water
 | Vikas Choudhury answered |
Wooden door is an opaque object as it has all the properties of one:
1. Opaque materials are those through which light cannot pass at all.
2. We cannot see through these objects. They can also be called not-see-through objects.
3. The color of this material depends on the light it absorbs.
4. An object on the other side of this material is not visible at all.
Spices provide- a)Flavour
- b)Vitamins
- c)Energy
- d)Proteins
Correct answer is 'A'. Can you explain this answer?
Spices provide
a)
Flavour
b)
Vitamins
c)
Energy
d)
Proteins
| | Vikas Choudhury answered |
Allspice is pungent and fragrant. It is not a blend of "all spices," but its taste and aroma remind many people of a mix of cloves, cinnamon, and nutmeg. Christopher Columbus discovered Allspice in the Caribbean. Although he was seeking pepper, he had never actually seen real pepper and he thought Allspice was it.
To see a shadow we need- a)A source of light and translucent object
- b)A source of light and transparent object
- c)A source of light and an opaque object
- d)Many source of light and opaque object
Correct answer is option 'C'. Can you explain this answer?
To see a shadow we need
a)
A source of light and translucent object
b)
A source of light and transparent object
c)
A source of light and an opaque object
d)
Many source of light and opaque object
 | Poonam Reddy answered |
A shadow is formed only when a source of light is obstructed by an opaque object.
The state of matter which has a definite volume but no definite shape- a)Solid
- b)Liquid
- c)Gas
- d)Mixture
Correct answer is 'B'. Can you explain this answer?
The state of matter which has a definite volume but no definite shape
a)
Solid
b)
Liquid
c)
Gas
d)
Mixture
 | Rishika Basak answered |
The state of matter which has a definite volume but no definite shape is called as liquid.
Q. The movement of earth around the sun is an example ofa)Oscillatory motionb)Circular motionc)Translatory motiond)Periodic motionCorrect answer is 'D'. Can you explain this answer?
| | Rajesh Khatri answered |
The answer is b.
A body moving along a circular pat is said to have a circular motion.
The distance of the moving body remains constant from a fixed point or axis, called the axis of rotation. The moving body changes its position during the motion. Thus the movement of earth around the sun is an example of Circular motion.
Pollen grains are produced in side- a)Ovary
- b)Stigma
- c)Anther
- d)Pistil
Correct answer is option 'C'. Can you explain this answer?
Pollen grains are produced in side
a)
Ovary
b)
Stigma
c)
Anther
d)
Pistil
| | Alok Verma answered |
The male sex cells of seed plants (flowering plants, conifers, and cycads) are contained in tough capsules called POLLEN. Pollen grains are produced by organs called anthers and must be transferred to the female parts of plants in order to form seeds. This process, called pollination, can be achieved in various ways. Some plants are assisted by animals that act as POLLINATORS. Others use the wind to take their pollen where it is needed.
Chemical changes are- a)Mostly reversible
- b)Always irreversible
- c)Always reversible
- d)Mostly irreversible
Correct answer is option 'D'. Can you explain this answer?
Chemical changes are
a)
Mostly reversible
b)
Always irreversible
c)
Always reversible
d)
Mostly irreversible
 | Kiran Mehta answered |
Chemical changes are changes that occur in the chemical properties of the substance like its flammability, radioactivity, etc. All chemical changes are mostly irreversible changes. Once the chemical properties of a substance are changed, it becomes another substance. Thus, it cannot return to its original state in most cases.
Angora goats are found in- a)Delhi and U.P
- b)Jammu and Kashmir
- c)Punjab and Goa
- d)Arunachal Pradesh and Karnataka
Correct answer is 'B'. Can you explain this answer?
Angora goats are found in
a)
Delhi and U.P
b)
Jammu and Kashmir
c)
Punjab and Goa
d)
Arunachal Pradesh and Karnataka
 | Kaavya Menon answered |
Angora goats are found in Jammu and Kashmir as they require low temperature for proper growth and reproduction.
Which types of magnet have two poles close to each other?- a)Bar magnet
- b)Horse-shoe magnet
- c)Cylindrical magnet
- d)Electromagnet
Correct answer is option 'B'. Can you explain this answer?
Which types of magnet have two poles close to each other?
a)
Bar magnet
b)
Horse-shoe magnet
c)
Cylindrical magnet
d)
Electromagnet
 | Sagar Mehta answered |
In horse-shoe types of magnet have two poles close to each other.
Silk thread is obtained from- a)Cocoon
- b)Caterpillar
- c)Pupa
- d)Adult moth
Correct answer is option 'A'. Can you explain this answer?
Silk thread is obtained from
a)
Cocoon
b)
Caterpillar
c)
Pupa
d)
Adult moth
 | Meera Reddy answered |
The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture).
Early man wears- a)Clothes manufactured in mills
- b)Unstitched clothes
- c)Clothes made by hands
- d)Tree barks, leaves and animals skin
Correct answer is 'D'. Can you explain this answer?
Early man wears
a)
Clothes manufactured in mills
b)
Unstitched clothes
c)
Clothes made by hands
d)
Tree barks, leaves and animals skin
 | Simran Deshpande answered |
Early man wears tree barks, leaves and animals skin to hide their body to overcome hot and cold condition.
Select the translucent materials from the following?- a)Glass tumbler
- b)Aluminium foil
- c)Muslin cloth
- d)Mirror
Correct answer is 'C'. Can you explain this answer?
Select the translucent materials from the following?
a)
Glass tumbler
b)
Aluminium foil
c)
Muslin cloth
d)
Mirror
| | Anjali Kapoor answered |
Muslin cloth is the example of translucent cloth while tericot is the example of opaque cloth material. Any material which will be completely transparent will not be used as cloth material.
Which one is not a transparent object?- a)Clean water
- b)Glass
- c)Thin sheet of plastic
- d)Muddy water
Correct answer is option 'D'. Can you explain this answer?
Which one is not a transparent object?
a)
Clean water
b)
Glass
c)
Thin sheet of plastic
d)
Muddy water
 | Charvi Sen answered |
The object through which light passes easily are called as transparent object. Clean glass, glass and thin sheet of plastic are transparent while muddy water is translucent.
Q.The property of attracting iron or other magnetic materials is calleda)Refractionb)Magnetismc)Retardationd)ReflectionCorrect answer is option 'B'. Can you explain this answer?
 | Anoushka Sharma answered |
The property of attracting iron or other magnetic materials is called magnetism.
Backbone consists of- a)13 vertebra
- b)23 vertebra
- c)43 vertebra
- d)33 vertebra
Correct answer is option 'D'. Can you explain this answer?
Backbone consists of
a)
13 vertebra
b)
23 vertebra
c)
43 vertebra
d)
33 vertebra
 | Athira Basak answered |
Backbone of human being consists of 33 vertebra placed one over the other.
Which pair of substance float in water- a)Pin, oil drops
- b)Thermocol, chalk
- c)Plastic ball, feather
- d)Coin, rubber band
Correct answer is option 'C'. Can you explain this answer?
Which pair of substance float in water
a)
Pin, oil drops
b)
Thermocol, chalk
c)
Plastic ball, feather
d)
Coin, rubber band
 | Anjana Rane answered |
Those substances that have less density than water floats on water surface such as plastic ball and feather.
Which one is not a natural source of water- a)River
- b)Lake
- c)Canal
- d)Pond
Correct answer is option 'A'. Can you explain this answer?
Which one is not a natural source of water
a)
River
b)
Lake
c)
Canal
d)
Pond
 | Kunal Mehta answered |
Correct option is (c) .
Dams, wells, tube wells, hand-pumps, canals, etc, are man-made sources of water.
Dams, wells, tube wells, hand-pumps, canals, etc, are man-made sources of water.
Which of the following part of body help in movement?- a)Organ and skin
- b)Muscle and bone
- c)Muscle and skin
- d)Organ and bone
Correct answer is option 'B'. Can you explain this answer?
Which of the following part of body help in movement?
a)
Organ and skin
b)
Muscle and bone
c)
Muscle and skin
d)
Organ and bone
 | Aashna Ahuja answered |
Muscle and bone together helps in movement in body parts.
Perfume is a substance which is - a)Malleable
- b)Volatile
- c)Sublime
- d)Non-volatile
Correct answer is option 'B'. Can you explain this answer?
Perfume is a substance which is
a)
Malleable
b)
Volatile
c)
Sublime
d)
Non-volatile
| | Athul Chatterjee answered |
Volatility is a material quality which describes how readily a substance vaporizes.
All metals are ----------- of heat and electricity.- a)Insulator
- b)Semi-conductor
- c)Good conductor
- d)Bad conductor
Correct answer is option 'C'. Can you explain this answer?
All metals are ----------- of heat and electricity.
a)
Insulator
b)
Semi-conductor
c)
Good conductor
d)
Bad conductor
| | Kunal Mehta answered |
In metals, some of the electrons (often one per atom) are not stuck to individual atoms but flow freely among the atoms. Of course, that's why metals are such good conductors of electricity.
Digestion of food is a- a)Temporary change
- b)Periodic change
- c)Chemical change
- d)Physical change
Correct answer is option 'C'. Can you explain this answer?
Digestion of food is a
a)
Temporary change
b)
Periodic change
c)
Chemical change
d)
Physical change
| | Aarya Joshi answered |
Digestion of food is a chemical change as chemical action change takes place to break the complex food into simpler substance by action of enzymes.
Can you explain the answer of this question below:The industry related to fabric and clothing is called
- A:
Fabric industry
- B:
Agro industry
- C:
Textile industry
- D:
Petrochemical industry
The answer is C.
The industry related to fabric and clothing is called
Fabric industry
Agro industry
Textile industry
Petrochemical industry
 | Pallabi Saha answered |
Textile industry is related to fabric and clothing. Textile industry is one of the largest industries employing large number of people.
Explain the following observations briefly:
An empty glass in fact is not empty.- a)Filled with water
- b)Filled with air
- c)Not empty
- d)Empty
Correct answer is option 'B'. Can you explain this answer?
Explain the following observations briefly:
An empty glass in fact is not empty.
An empty glass in fact is not empty.
a)
Filled with water
b)
Filled with air
c)
Not empty
d)
Empty
| | Anita Menon answered |
The glass which is empty is actually filled with air. And because air takes up space when an empty glass is inverted and inserted into a trough filled with water, the air is trapped within and it is no anyway for air to escape out.
Which of the following substance is found in all three states in nature?- a)Ether
- b)Water
- c)Petrol
- d)Kerosene oil
Correct answer is option 'B'. Can you explain this answer?
Which of the following substance is found in all three states in nature?
a)
Ether
b)
Water
c)
Petrol
d)
Kerosene oil
| | Varun Kapoor answered |
Water is the only substance on Earth that is present in all three states of matter – as a solid, liquid or gas. (And Earth is the only planet where water is abundantly present in all three states.
One cm is equal to- a)1 km
- b)1 m
- c)10 mm
- d)1000 m
Correct answer is option 'C'. Can you explain this answer?
One cm is equal to
a)
1 km
b)
1 m
c)
10 mm
d)
1000 m
 | Moumita Desai answered |
One centimetre (cm) is equal to 10 mm.
Which of the following food is obtained from the roots of the plant?- a)Potato, ginger, onion
- b)Radish, carrot, turnip
- c)Spinach, lettuce, mint
- d)Sugarcane, onion, ginger
Correct answer is option 'B'. Can you explain this answer?
Which of the following food is obtained from the roots of the plant?
a)
Potato, ginger, onion
b)
Radish, carrot, turnip
c)
Spinach, lettuce, mint
d)
Sugarcane, onion, ginger
| | Amit Kumar answered |
Radish, carrot and turnip are examples of edible roots.
Which of these ingredients is not obtained from plants or animals?- a)Honey
- b)Salt
- c)Wheat
- d)Milk
Correct answer is option 'B'. Can you explain this answer?
Which of these ingredients is not obtained from plants or animals?
a)
Honey
b)
Salt
c)
Wheat
d)
Milk
| | Pooja Shah answered |
Salt is obtained from sea water. It is not obtained from plants or animals.
In the morning, when the sun rises in the east, your shadow will be seen on the- a)North
- b)West
- c)South
- d)East
Correct answer is option 'B'. Can you explain this answer?
In the morning, when the sun rises in the east, your shadow will be seen on the
a)
North
b)
West
c)
South
d)
East
 | Divya kulkarni answered |
In the morning, when the sun rises in the east, your shadow will be seen on the west, i.e. on the opposite side.
The place where a living organism live is called- a)Habit
- b)Room
- c)House
- d)Habitat
Correct answer is option 'D'. Can you explain this answer?
The place where a living organism live is called
a)
Habit
b)
Room
c)
House
d)
Habitat
| | Manasa Menon answered |
The place where a living organism lives is called habitat of the organism.
Which part of a mustard plant is edible?- a)Seeds and flowers
- b)Leaves and flowers
- c)Seeds and leaves
- d)Stem and roots
Correct answer is option 'C'. Can you explain this answer?
Which part of a mustard plant is edible?
a)
Seeds and flowers
b)
Leaves and flowers
c)
Seeds and leaves
d)
Stem and roots
| | Vikram Verma answered |
Seeds of mustard are used for oil and spices while leaves are used as vegetables.
Chair, table and plough are made up of- a)Plastic
- b)Iron
- c)Wood
- d)Paper
Correct answer is option 'C'. Can you explain this answer?
Chair, table and plough are made up of
a)
Plastic
b)
Iron
c)
Wood
d)
Paper
| | Tushar Iyer answered |
Chair, table and plough are made up of wood obtained from plants.
Which among the following materials are not lustrous- a)Silver
- b)Gold
- c)Diamond
- d)Wood
Correct answer is option 'D'. Can you explain this answer?
Which among the following materials are not lustrous
a)
Silver
b)
Gold
c)
Diamond
d)
Wood
| | Pritam Shah answered |
Those substances that have shining surface are called as lustrous substance. Diamond, gold and silver are lustrous
Can you explain the answer of this question below:Which type of material is used to make wind screen of a car?
- A:
Transparent
- B:
Translucent
- C:
Opaque
- D:
Semi-transparent
The answer is A.
Which type of material is used to make wind screen of a car?
Transparent
Translucent
Opaque
Semi-transparent
| | Bijoy Goyal answered |
Material Used to Make Windscreen of a Car
The windscreen of a car is an essential component that protects the driver and passengers from wind, rain, dust, and other external elements. It is a transparent screen made of a special type of material that provides excellent visibility to the driver. The material used to make the windscreen of a car is:
Transparent
Transparent materials allow light to pass through them without scattering the light. The windscreen of a car is made of transparent materials such as glass, polycarbonate, or acrylic. The choice of material depends on the manufacturer's preference and the type of car. Glass is commonly used in high-end cars, while polycarbonate and acrylic are used in budget cars.
Glass
Glass is a brittle and transparent material made by melting silica with other materials. The glass used in car windscreens is tempered glass, which is heated and cooled rapidly to make it stronger and more durable. Tempered glass is resistant to impact and shattering, making it an ideal material for car windscreens.
Polycarbonate
Polycarbonate is a transparent and lightweight thermoplastic material that is commonly used in car windscreens. It is highly resistant to impact, shattering, and UV radiation, making it an excellent material for car windscreens. Polycarbonate is also more flexible than glass, making it less prone to cracking or breaking.
Acrylic
Acrylic is a transparent thermoplastic material that is commonly used in budget cars. It is less expensive than glass and polycarbonate, making it an affordable option for car windscreens. However, acrylic is less durable than glass and polycarbonate and is more prone to scratching and cracking.
Conclusion
In conclusion, the material used to make the windscreen of a car is transparent. Glass, polycarbonate, and acrylic are the most commonly used materials for car windscreens. The choice of material depends on the manufacturer's preference and the type of car.
The windscreen of a car is an essential component that protects the driver and passengers from wind, rain, dust, and other external elements. It is a transparent screen made of a special type of material that provides excellent visibility to the driver. The material used to make the windscreen of a car is:
Transparent
Transparent materials allow light to pass through them without scattering the light. The windscreen of a car is made of transparent materials such as glass, polycarbonate, or acrylic. The choice of material depends on the manufacturer's preference and the type of car. Glass is commonly used in high-end cars, while polycarbonate and acrylic are used in budget cars.
Glass
Glass is a brittle and transparent material made by melting silica with other materials. The glass used in car windscreens is tempered glass, which is heated and cooled rapidly to make it stronger and more durable. Tempered glass is resistant to impact and shattering, making it an ideal material for car windscreens.
Polycarbonate
Polycarbonate is a transparent and lightweight thermoplastic material that is commonly used in car windscreens. It is highly resistant to impact, shattering, and UV radiation, making it an excellent material for car windscreens. Polycarbonate is also more flexible than glass, making it less prone to cracking or breaking.
Acrylic
Acrylic is a transparent thermoplastic material that is commonly used in budget cars. It is less expensive than glass and polycarbonate, making it an affordable option for car windscreens. However, acrylic is less durable than glass and polycarbonate and is more prone to scratching and cracking.
Conclusion
In conclusion, the material used to make the windscreen of a car is transparent. Glass, polycarbonate, and acrylic are the most commonly used materials for car windscreens. The choice of material depends on the manufacturer's preference and the type of car.
The total number of bones in the human skeleton are- a)206
- b)296
- c)106
- d)196
Correct answer is option 'A'. Can you explain this answer?
The total number of bones in the human skeleton are
a)
206
b)
296
c)
106
d)
196
| | Saikat Malik answered |
There are 206 bones in the human skeleton system in all in adult human beings.
The process of removal of fleece from the body of sheep is called- a)Cleaning
- b)Carding
- c)Shearing
- d)Removal
Correct answer is 'C'. Can you explain this answer?
The process of removal of fleece from the body of sheep is called
a)
Cleaning
b)
Carding
c)
Shearing
d)
Removal
 | Vandana Mukherjee answered |
Sheep shearing is the process by which the woollen fleece of a sheep is cut off. The person who removes the sheep's wool is called a shearer. Typically each adult sheep is shorn/sheared once each year.
The annual shearing most often occurs in a shearing shed, a facility especially designed to process often hundreds and sometimes more than 3,001 sheep per day.
Sheep are shorn in all seasons, depending on the climate, management requirements and the availability of a woolclasser and shearers.
Q. The most beautiful part of plant isa)Branchesb)Leavesc)Flowersd)StemsCorrect answer is option 'C'. Can you explain this answer?
| | Vikas Choudhury answered |
Flower is the most beautiful part of a plant. It changes into fruit.
Most of the plants bear flowers. Flowers are of different shapes, sizes and colors. Some flowers smell good. Some of the good smelling flowers are rose, jasmine, lotus, sunflower, apple flower.
Bacteria that decompose organic wastes are called- a)Anaerobic bacteria
- b)Lactobacillus bacteria
- c)Aerobic bacteria
- d)All of these
Correct answer is option 'A'. Can you explain this answer?
Bacteria that decompose organic wastes are called
a)
Anaerobic bacteria
b)
Lactobacillus bacteria
c)
Aerobic bacteria
d)
All of these
 | Anjali Yadav answered |
The bacteria that decompose organic wastes are called anaerobic bacteria.
The joint which helps in rotating a body in all directions is called _______- a)Hinge joint
- b)Ball and Socket Joint
- c)Pivot joint
- d)Fixed Joint
Correct answer is option 'B'. Can you explain this answer?
The joint which helps in rotating a body in all directions is called _______
a)
Hinge joint
b)
Ball and Socket Joint
c)
Pivot joint
d)
Fixed Joint
| | Shaila Patel answered |
The ball and socket joint, the bones can be turned in any direction i.e. forward and backward, side to side and even rotated. The ball and socket joints occur at the shoulder and hips in our body.
Snail moves with the help of- a)Whole body
- b)Bone
- c)Shell
- d)Muscular foot
Correct answer is option 'D'. Can you explain this answer?
Snail moves with the help of
a)
Whole body
b)
Bone
c)
Shell
d)
Muscular foot
 | Arjun Desai answered |
A snail uses its single long, muscular foot to crawl on a layer of mucus-like slime that it secretes. ... The waves move much faster than the snail itself, and generate enough force to push the snail forward.
In general, on heating metals _______- a)contract
- b)expand
- c)can expand or contract
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
In general, on heating metals _______
a)
contract
b)
expand
c)
can expand or contract
d)
none of these
| | Vikas Choudhury answered |
When a metal ring is heated, does the hole expand, contract, or stay the same size? Spoiler alert: The puzzle is answered in the update at the end of this post. Most solids expand when heated and contract when cooled. Water/ice is anomalous in that it expands when cooled, at least near its freezing point.
Q. Which of the following is biodegradable?a)Aluminium foilb)Aluminiumc)Orange peelsd)Plastic bottleCorrect answer is option 'C'. Can you explain this answer?
 | Anisha Nambiar answered |
Orange peels are biodegradable as it gets decomposed naturally by action of microbes.
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