Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Kanishka Pandey 4 years, 6 months ago
- 2 answers
Gaurav Seth 4 years, 6 months ago
Physical changes
The changes in which no new substance are formed,are called physical changes. In a physical change,the substances involved do not change their identity.They can be easily returned to their original form by some physical changes. For Ex:Freezing of water,Boiling of water,Condensation of steam,Making a solution,Glowing of electric bulb,stretching of rubber band,cutting or tearing a piece of paper etc.
Chemical Changes
The changes in which new substance are formed,are called chemical changes. In a chemical change,the substances involved change their identity ie they get converted into entirely new substance. For Ex:Burning of magnesium ribbon,Rusting of iron,Formation of curd from milk,Cooking of food etc
Posted by Saheb Chaudhary 4 years, 6 months ago
- 1 answers
Yogita Ingle 4 years, 6 months ago
When a paper is burnt, the molecules of paper undergo change forming new substances like smoke and water vapour. The change here is irreversible. So, a burnt piece of paper cannot be brought back to its original form.
Posted by Sonal Singh 4 years, 6 months ago
- 3 answers
Gaurav Seth 4 years, 6 months ago
not transparent or translucent; impenetrable to light; not allowing light to pass through. not transmitting radiation, sound, heat, etc. not shining or bright; dark; dull. hard to understand; not clear
Yogita Ingle 4 years, 6 months ago
Materials which don't allow light to pass through them completely are called Opaque objects. Objects on the other side of opaque objects cannot be seen at all. Eg: Wood, metals etc.
Posted by Archana Singh 4 years, 6 months ago
- 1 answers
Meghna Thapar 4 years, 6 months ago
Levers can be used so that a small force can move a much bigger force. This is called mechanical advantage. In our bodies bones act as lever arms, joints act as pivots, and muscles provide the effort forces to move loads. There are four parts to a lever – lever arm, pivot, effort and load. There are three types of levers: first class, second class and third class. The difference between the three classes depends on where the force is, where the fulcrum is and where the load is.
Posted by Swarali Nikam 4 years, 6 months ago
- 1 answers
Posted by L. Ahenba Singha 4 years, 6 months ago
- 4 answers
Khushi Queen Queen 4 years, 6 months ago
Yogita Ingle 4 years, 6 months ago
Protein: Protein helps in body growth and repairs the tissues so it is also called body building food. We get protein from milk, eggs, meat, fish and all kinds of pulse.
Posted by Pratyush Raj Class 6A 4 years, 6 months ago
- 1 answers
Yogita Ingle 4 years, 6 months ago
Circular Motion - This is a motion where objects move along a circular path. Examples hands of a clock, blades of a fan, rotation of earth around the sun etc.
A type of circular motion where an object spins on its own axis, it is called rotational motion. Example rolling ball, spinning top etc.
Posted by Harsh Vardhan 4 years, 6 months ago
- 4 answers
Kanishka Pandey 4 years, 6 months ago
Yogita Ingle 4 years, 6 months ago
liquids are motile i.e movable and container made if cloth or paper have gaps that are sufficient for movement of liquid outside the containers.
Paper container can't hold liquids and in cloth the liquid will flow out.
Posted by Pratyush Raj Class 6A 4 years, 6 months ago
- 2 answers
Yogita Ingle 4 years, 6 months ago
|
Image |
Shadow |
|
Image is formed due to the reflection or refraction of light |
Shadows are formed when opaque objects obstruct the path of light. |
|
Image is seen when light comes from the object after reflection or refraction enters the observer's eye. |
No light enters the eye from the shadow of the object. |
|
Image gives more information such as colour, structure, etc. about the object. |
Shadow does not provide any details about the object but it gives an idea about the shape of the object. |
Gaurav Seth 4 years, 6 months ago
| Image | Shadow |
| (1) It is formed by intersection of reflected rays. | (1) Shadow is formed when light does not reach behind the object. |
| (2) Image is seen when reflected rays approach to observer's eyes. | (2) No light enters the observer's eyes. |
| (3) Image gives more information such as colour, structure etc. | (3) Shadow does not provide such information. |
| (4) Image can be straight or inverted. | (4) Shadow is never inverted. |
Posted by Pratyush Raj Class 6A 4 years, 6 months ago
- 2 answers
Yogita Ingle 4 years, 6 months ago
Periodic motion, in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.
Gaurav Seth 4 years, 6 months ago
Periodic motion, in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.
Posted by Pratyush Raj Class 6A 4 years, 6 months ago
- 1 answers
Gaurav Seth 4 years, 6 months ago
A unit of measurement which has a fixed value which does not change from person to person or place to place, is called a standard unit of length. It is necessary to have standard units of measurements for the sake of uniformity in measurements.
Posted by Mannat Anand 4 years, 6 months ago
- 4 answers
Pratyush Raj Class 6A 4 years, 6 months ago
Gaurav Seth 4 years, 6 months ago
Components of food: The main components of food are:
- Carbohydrates.
- Proteins.
- Fats.
- Vitamins.
- Mineral salts.
- water and.
- Fibers.
Posted by Manisha Rathod 4 years, 6 months ago
- 2 answers
Atreyee Datta ?? 4 years, 6 months ago
Gaurav Seth 4 years, 6 months ago
Animal fibres — wool and silk
Wool :
Wool comes from sheep, goat, yak and some other animals. These wool-yielding animals bear hair on their body.
SILK:
Silk fibres are also animal fibres. Silkworms spin the ‘silk fibres’. The rearing of silkworms for obtaining silk is called sericulture.
Posted by Aisha Manna . K 4 years, 6 months ago
- 1 answers
Posted by Mayuri Halyal 4 years, 6 months ago
- 3 answers
Kanishka Pandey 4 years, 6 months ago
Netal Bhansali 4 years, 6 months ago
Posted by Cm| Black Bolt 4 years, 6 months ago
- 5 answers
Posted by Aadhya Sharma 4 years, 6 months ago
- 3 answers
Mayuri Halyal 4 years, 6 months ago
Yogita Ingle 4 years, 6 months ago
Following is a list of major deficiency diseases that occur due to lack of essential minerals and vitamins:
|
Types of Vitamins |
Deficiency Diseases |
|
A (Retinol) |
Night blindness |
|
B1 (Thiamine) |
Beri-beri |
|
B2 (Riboflavin) |
Retarded growth, bad skin |
| B12 (Cyanocobalamin) |
Anaemia |
|
C (Ascorbic acid) |
Scurvy |
|
D (Calciferol) |
Rickets |
| K (Phylloquinone) |
Excessive bleeding due to injury |
Posted by Aadhya Sharma 4 years, 6 months ago
- 1 answers
Yogita Ingle 4 years, 6 months ago
Balanced Diet
- The food that a person eats in a day is called diet.
- Balanced diet is the diet which contains all kinds of essential nutrients in right amount needed for proper growth and maintenance of our body. Also our diet should contain roughage (raw uncooked vegetables)and water.
- Balanced diet depends on the age and the type of physical work we do.
- For example: an athlete would consume more amount of carbohydrate to gain more energy, an old age person would consume food which can be easily digestible.
- Most of the vegetables and fruits skin contain good amount of vitamins and minerals.
- Continuous washing, boiling or overcooking vegetables would loss many nutrients present in them.
Posted by Aadhya Sharma 4 years, 6 months ago
- 2 answers
Varsha Bhosle 4 years, 6 months ago
Yogita Ingle 4 years, 6 months ago
Mix 10 drops of tincture of iodine with 30 drops of water to make an iodine solution. Put a cracker on a plate, and test it for starch using a drop of the iodine solution.
Posted by Yash Joshi 4 years, 6 months ago
- 1 answers
Posted by Nitin Aryan Tudu 4 years, 6 months ago
- 1 answers
Avneet Kaur 4 years, 6 months ago
Posted by Abinash Sahu 4 years, 6 months ago
- 2 answers
Posted by Diksha Jadhav 4 years, 6 months ago
- 2 answers
Yogita Ingle 4 years, 6 months ago
The Arctic Circle lies at 66 and ½ degree north of the equator. The earth rotates on its orbit around the sun and completes its rotation and revolution. The earth receives the rays of the sun horizontally and we perceive it as vertical.
Some consider the direct rays of sun as vertical rays that are received by the equatorial region. The arctic region receives sunlight for 24 hours in summers, but they are not vertical rays as the sun is at a low elevation from arctic region.
Gaurav Seth 4 years, 6 months ago
The Arctic Circle lies at 66 and ½ degree north of the equator. The earth rotates on its orbit around the sun and completes its rotation and revolution. The earth receives the rays of the sun horizontally and we perceive it as vertical.
Some consider the direct rays of sun as vertical rays that are received by the equatorial region. The arctic region receives sunlight for 24 hours in summers, but they are not vertical rays as the sun is at a low elevation from arctic region.
Posted by Radha Rao 4 years, 6 months ago
- 1 answers
Gaurav Seth 4 years, 6 months ago
Activity 3.1
Activity 3.1 asks us to feel and compare the hairs present on our head and skin.
Observation: We feel body hairs are softer than hairs on our head.
Answer: Hairs in different regions of our body are different. Our head and facial hairs are much harder than the hairs which grow on other parts. As a result, we feel different when we touch body hair and compare it with hairs on the head.
Posted by Dj Shinde 4 years, 6 months ago
- 2 answers
Yogita Ingle 4 years, 6 months ago
- All living organisms such as plants and animals require food. So, food is essential for all living organisms.
- Carbohydrates, proteins, fats, vitamins and minerals are essential components of food, these components are called nutrients.
- In addition, food also contains dietary fibres and waters
Posted by Shubhi Pandey 4 years, 6 months ago
- 2 answers
Gaurav Seth 4 years, 6 months ago
Fabric is a finished product. It could be either knitted or woven. It is wearable.
Whereas, Fibre is a natural product, for eg. Cotton, wool etc. It is not wearable. We have to spun yarn and thread from fibers, which is further woven or knitted into a fabric.
Yogita Ingle 4 years, 6 months ago
Fibre is the material or the ingredient that goes into making fabric. Thus cotton fiber is used to make cotton fabric. The process of converting a fibre into a fabric can be weaving or knitting. For example, wool fibre can be converted into woolen fabrics by making use of weaving to manufacture woolen coats and trousers or it can be used to be converted into sweaters and pullovers through the process of knitting.Fabric is the finished product that we see being sold in textile and dress material shops as well as upholstery shops. On the other hand, fibre is obtained from natural sources such as plants and animals or it could be synthetic, having been made in factories.
Posted by Krishna Kant 4 years, 6 months ago
- 1 answers
Gaurav Seth 4 years, 6 months ago
|
Vapour |
Gas |
|
A substance which under ordinary conditions is a solid or a liquid but under specific conditions is gaseous is called vapour. |
When a substance exists in the gaseous state under ordinary conditions that is, at room temperature and one atmospheric pressure, it is called a gas. |
|
A vapour is a substance which has experienced a phase change. |
A gas is a substance which has not, and will not experience a phase change. |
|
Vapour is a solid or a liquid at room temperature, that its natural state of matter is either a solid or a liquid. |
The natural state of matter for a gas is a gas. |
|
A vapour is a substance above its boiling point temperature. |
A gas is a substance above its critical temperature. |
|
Example: Iodine is a solid under ordinary conditions, but when it is heated, it changes into its gaseous state in the form of iodine vapours. |
Example: Oxygen, Nitrogen, Chlorine. |
Posted by Raviraj S Patil 4 years, 6 months ago
- 2 answers
Posted by M M 4 years, 6 months ago
- 1 answers
Partibha Chaubey 4 years, 6 months ago
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Sangeeta Kumari 4 years, 6 months ago
1Thank You