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Ask QuestionPosted by ? Umayall ❤ 4 years, 10 months ago
- 2 answers
Yogita Ingle 4 years, 10 months ago
| Physical Change | Chemical Change |
| When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. | When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances. |
| Physical change is a temporary change. | A chemical change is a permanent change. |
| A Physical change affects only physical properties i.e. shape, size, etc. | Chemical change both physical and chemical properties of the substance including its composition |
| A physical change involves very little to no absorption of energy. | During a chemical reaction, absorption and evolution of energy take place. |
| Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. | A few examples of chemical change are digestion of food, burning of coal, rusting, etc. |
| Generally, physical changes do not involve the production of energy. | Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.) |
Posted by Simran Singh 4 years, 10 months ago
- 2 answers
Nitin Raj 4 years, 10 months ago
Gaurav Seth 4 years, 10 months ago
A cell is defined as the smallest, basic unit of life that is responsible for all of life's processes.” Cells are the structural, functional, and biological units of all living beings. ... They are known as the building blocks of life.
Posted by Diksha Dubey 4 years, 10 months ago
- 2 answers
Chahat Pandit 4 years, 10 months ago
Posted by Meghna Roy 4 years, 10 months ago
- 2 answers
Gaurav Seth 4 years, 10 months ago
A compass is usually a small box with a glass cover on it. A magnetised needle is pivoted inside the box, which can rotate freely.
The compass also has a dial with directions marked on it.
The compass is kept at the place where we wish to know the directions. Its needle indicates the north-south direction when it comes to rest.
The compass is then rotated until the north and south marked on the dial are at the two ends of the needle.
To identify the north-pole of the magnetic needle, it is usually painted in a different colour.
Red colour arrow usually points to North Pole. If we know the North direction we can find all other 3 directions of that place.
Posted by Meghna Roy 4 years, 10 months ago
- 1 answers
Gaurav Seth 4 years, 10 months ago
A compass is usually a small box with a glass cover on it. A magnetised needle is pivoted inside the box, which can rotate freely.
The compass also has a dial with directions marked on it.
The compass is kept at the place where we wish to know the directions. Its needle indicates the north-south direction when it comes to rest.
The compass is then rotated until the north and south marked on the dial are at the two ends of the needle.
To identify the north-pole of the magnetic needle, it is usually painted in a different colour.
Red colour arrow usually points to North Pole. If we know the North direction we can find all other 3 directions of that place.
Posted by Prince Prajapati 4 years, 10 months ago
- 1 answers
Yogita Ingle 4 years, 10 months ago
Lead acid batteries are the most commonly used type of battery in photovoltaic systems
Posted by Dron Raj 4 years, 10 months ago
- 2 answers
Posted by Grick Sudrania 4 years, 10 months ago
- 5 answers
Sneha Kumari 4 years, 10 months ago
Yogita Ingle 4 years, 10 months ago
True
A magnetic compass is a device used to find direction.
Posted by Grick Sudrania 4 years, 10 months ago
- 4 answers
Yogita Ingle 4 years, 10 months ago
The filament t of a bulb glows when current is passed through it .
Posted by Grick Sudrania 4 years, 10 months ago
- 5 answers
Gaurav Seth 4 years, 10 months ago
False
When like poles are brought together, all the electrons start spinning in the same direction. And when unlike poles are brought together, all the electrons start spinning in the opposite direction. Thus, like poles repel and unlike poles attract each other.
Yogita Ingle 4 years, 10 months ago
False
Unlike poles of different magnets attract each other; like poles repel each other.
Posted by Grick Sudrania 4 years, 10 months ago
- 3 answers
Posted by Grick Sudrania 4 years, 10 months ago
- 2 answers
Yogita Ingle 4 years, 10 months ago
False,
Magnetic attraction is maximum near the ends of the magnet.These ends are called magnetic poles.
Posted by Grick Sudrania 4 years, 10 months ago
- 1 answers
Yogita Ingle 4 years, 10 months ago
False
A bar magnet is a rectangular piece of an object that shows permanent magnetic properties and are made from the ferromagnetic substance.
Posted by Grick Sudrania 4 years, 10 months ago
- 2 answers
Yogita Ingle 4 years, 10 months ago
The region around a magnet where its magnetic influence can be felt is called its magnetic field.
Posted by Harsith D 4 years, 10 months ago
- 2 answers
Yogita Ingle 4 years, 10 months ago
The property used in a mixture of two solids by Threshing in difference in weight:
False
The property used in separating a mixture of two solid by winnowing is difference in weight.
Posted by Kirat Sandhu 4 years, 10 months ago
- 1 answers
Yogita Ingle 4 years, 10 months ago
A battery can be defined as an electrochemical device (consisting of one or more electrochemical cells) which can be charged with an electric current and discharged whenever required. Batteries are usually devices that are made up of multiple electrochemical cells that are connected to external inputs and outputs.
Posted by Aman Sandhu 4 years, 10 months ago
- 1 answers
Gaurav Seth 4 years, 10 months ago
1. Transparent objects - Those objects through which light can pass easily are called transparent object e.g. water, glass, air.
2. Translucent object - The object through which light can pass partially are called translucent objects e.g. tracing paper, waxed paper.
Posted by Diya Ahir 4 years, 10 months ago
- 0 answers
Posted by Ratnesh Mehra 4 years, 10 months ago
- 2 answers
Saneha Yadav 4 years, 10 months ago
Harshi Kumawat 4 years, 10 months ago
Posted by Technical Tiger 4 years, 10 months ago
- 2 answers
Divisha Jain 4 years, 10 months ago
Gaurav Seth 4 years, 10 months ago
- Carnivorous animals such as lion and tiger have sharp teeth and powerful jaws to kill prey.
- Baleen whales are also predators. They hunt krill using their baleen plates as filter-feeding systems.
- Animals such as chameleons and some frogs have long sticky tongues to catch prey.
- Most carnivores are usually fast as they need to chase and tire their prey.
- Some carnivorous animals like snakes and spiders use venom to kill their prey.
- Carnivores do not have the ability to detoxify vitamin A in the liver.
- The length of the intestine in the carnivorous animals is small.
Posted by Jaismeen Kaur Jassu 4 years, 10 months ago
- 2 answers
Gaurav Seth 4 years, 10 months ago
If a plant has fibrous roots, what type of venation are its leaves likely to have?
a n s w e r
<article id="post-1205991">Plants with fibrous roots have parallel venation in their leaves. For example, grass, wheat maize, etc. have fibrous roots with parallel venation.
</article>Posted by Princy Singh 4 years, 10 months ago
- 2 answers
Yogita Ingle 4 years, 10 months ago
Fabrics are made from yarns, which in turn are made from fibers. Fibers are either natural or synthetic. Cotton, wool, silk and jute are some natural fibers, while nylon and polyester are some examples of synthetic fibers.
Posted by Keya .V. Gaudani 4 years, 10 months ago
- 2 answers
Yogita Ingle 4 years, 10 months ago
Sand and water can be separated by any of the following two methods:
(a) Sedimentation and decantation: Mixture is kept undisturbed for some time. After some time, sand being heavier and insoluble in water, settles down at the bottom of container. Now, water is poured into another container to separate it from sand.
(b) Filtration: Mixture of sand and water is passed through a filter paper (a filter with very fine pores). Sand particles being larger in size are retained by the filter paper and get separated from water.
Posted by Tanvi Goswami 4 years, 10 months ago
- 1 answers
Yogita Ingle 4 years, 10 months ago
Yes, a cylindrical shape is the one that would give a circular shadow if held in one way and a rectangular shadow if held in another way. Its circular ends will form a circular shadow when kept in the way of light whereas its curved sides will give rectangular shadow.
Posted by Tanvi Goswami 4 years, 10 months ago
- 2 answers
Yogita Ingle 4 years, 10 months ago
The movement of an organism from one place to another is known as locomotion. In this process, there is the action of appendages such as limbs, wings, and flagella. In some animals, such as fish, whales, and shark, the locomotion results from a wave-like series of muscle contractions. Locomotion helps an organism to find food, avoid harsh weather conditions, escape from their predators, etc.
Posted by Shersingh Gurjar 4 years, 10 months ago
- 3 answers
Ritvik Buxi 4 years, 10 months ago
Posted by Manarsh Singh 4 years, 10 months ago
- 1 answers
Gaurav Seth 4 years, 10 months ago
An object which gives out light is called a source of light.
The various sources of light around us are Sun, stars , bulb, tubelight, kerosene oil lamp, candle, torch, firefly etc.
The most important source of light for us is the Sun. It is about 150 million km away from us , its light makes the daytime bright on the earth. At night we use an electric bulb ,tube light ,lamp ,candle or torch as a source of light.
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? Umayall ❤ 4 years, 9 months ago
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