CBSE > Class 07 > Science | CBSE Board | Homework Help

Light is a radiation or a form of energy that our eyes can detect. Light enables us to view our surroundings. Light travels from one place to another in a straight line.

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what is dispersion ?

Posted by Raj Thakker 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 5 years, 9 months ago

The phenomenon of splitting of white light into its seven component colours is called dispersion of light. Splitting of white light into its component colours is due to the fact that lights of different colours travel with different speeds.

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Write three properties of chemical change

Posted by Mohan Pandit 5 years, 9 months ago

CBSE > Class 07 > Science

3 answers

Nishant Kumar 5 years, 9 months ago

i)A chemical change is permanent. ii)A chemical change is irreversible change. iii)New substances are formed after a chemical change.

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Shami Kaurav 5 years, 9 months ago

permanent change irreversible change light heat and energy is given off formation of new substance

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Yogita Ingle 5 years, 9 months ago

A chemical change is a type of change where the chemical properties of matter change.
Irreversible process
Energy is either absorbed or evolved
The new product is formed

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Wich is not responsible for water shortage?

Posted by Prajan Kumar 5 years, 9 months ago

CBSE > Class 07 > Science

4 answers

Kamalika Samadder 5 years, 9 months ago

Heavy rainfall

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Mansi R 5 years, 9 months ago

Heavy rain

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Yogita Ingle 5 years, 9 months ago

Water is one of the most valuable resources on Earth. Rainwater fills reservoirs that supply drinking water, provide a habitat for fish to live, and nourishes the soil with water necessary for vegetation.
Hence Heavy rainfall is not responsible for water shortage.
So, the correct answer is 'Heavy rainfall'.

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Prajan Kumar 5 years, 9 months ago

Increasing population

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What is the difference between a convex and a concave mirror

Posted by Siri Nuligommu 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Divyansh Jain 5 years, 9 months ago

A mirror which have reflecting surface is on outside is known as convex mirror. A mirror which have reflecting surface is on inside is known as concave mirror.

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Discuss in brief the likely consequences of deforestation.

Posted by Aditya Raj 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 9 months ago

Consequences of deforestation:

Increase in overall temperature of the earth called global warming.
Lesser rain causing desertification.
Increased soil erosion leading to loss of humus from the soil.
Unbalanced ecosystem leads to depleted groundwater and disturbed oxygen and carbon dioxide ration in the atmosphere.
Loss of forest products.
In the absence of trees and plants, the animals will not get food and shelter.
In the absence of trees, the soil will not hold water, which will cause floods.

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Draw a single pendulam moving in A and B

Posted by Firiyaj Alam 5 years, 9 months ago

CBSE > Class 07 > Science

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Water from the undigested food is absorbed mainly in _____________

Posted by Ashit Yadav 5 years, 9 months ago

CBSE > Class 07 > Science

2 answers

Nishant Kumar 5 years, 9 months ago

Large intestine

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Divyansh Jain 5 years, 9 months ago

Water from the undigested food is absorbed mainly in small intestine.

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Any ten questions from ch 10

Posted by Angel Desouza 5 years, 9 months ago

CBSE > Class 07 > Science

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Classify the following motion along a straight line ,circular or oscillatory motion. 1motion of a bus on a straight line

Posted by Simran S 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Swarnajit Dey 5 years, 9 months ago

Rechtillinear or straight line motion

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The letters in the page appear black .Why? Explain?

Posted by Sunil Sharma 5 years, 9 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

How the IUPAC NAMES ARE IDENTIFIED?

Posted by Durga Prasad 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

IUPAC is an acronym for International Union of Pure and Applied Chemistry. The IUPAC is the recognized authority for chemical standards of nomenclature, measurements, and atomic mass values, setting the standards of atomic weights that appear on the periodic table. IUPAC Rules. In order to name organic compounds you must first memorize a few basic names. ... In general, the base part of the name reflects the number of carbons in what you have assigned to be the parent chain. The suffix of the name reflects the type(s) of functional group(s) present on (or within) the parent chain.

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Why arteries have thick walls? Give answer in one word.

Posted by Aayush Patel 5 years, 9 months ago

CBSE > Class 07 > Science

3 answers

Firiyaj Alam 5 years, 9 months ago

Arteries have thick walls because arteries have high pressure to transport blood

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Simran Ahden 5 years, 9 months ago

Arteries have thick elastic walls to deal with the high pressure of blood coming from the heart

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Satyavani Chada 5 years, 9 months ago

Arteries have thick walls becuause they carry oxgenated blood from heart to all parts of the body

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The arrangement of a string and a solid body tied to it such that it oscillates about a fixed point is called ............

Posted by Jyoti Kalra 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Divyansh Jain 5 years, 9 months ago

One to-and-fro movement of a pendulum is known as oscillation. The time taken by a pendulum to complete one oscillation is known as time period of a pendulum.

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How do we find mean temperature for a given period?

Posted by Divyanshu Goswami 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Divyansh Jain 5 years, 9 months ago

Mean temperature = Sum of observations ÷ Number of observations.

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describe the process of neutralization which the help of an example

Posted by Ansh Kanojia 5 years, 9 months ago

CBSE > Class 07 > Science

5 answers

Nishant Kumar 5 years, 9 months ago

In a neutralisation reaction an acid reacts with a base to form salt and water. Ex:CaO + 2HCL ---> CaCl2 + H2O (acid) (base) (salt) (water)

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Firiyaj Alam 5 years, 9 months ago

The reaction between acid and base are known as neatralisation. Salt and water are produced in thia process with the evolution of heat. The following example:- Hydrichloric acid (HCL)+sodium hydroxide (NaOh)=sodium chloride(NaCl) +water(H2O)

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Divyansh Jain 5 years, 9 months ago

The process by which an acid reacts with a base to form salt and water is known as neutralization reaction. Example - HCl ( acid ) + NaOH ( base) = NaCl ( salt ) + water

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Swarnajit Dey 5 years, 9 months ago

Hcl+Naoh=Nacl+H2o

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Swarnajit Dey 5 years, 9 months ago

The process by which the acid and base reacts to form salt and water as well as a new substance is called Neautrilization

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What is cannine

Posted by Aniket Chaudhary 5 years, 9 months ago

CBSE > Class 07 > Science

5 answers

Divyansh Jain 5 years, 9 months ago

Cannine is a type of teeth that helps in tearing the food. This type of teeth is present in the carnivores for tearing the flesh.

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Swarnajit Dey 5 years, 9 months ago

Sorry spelling is lichen

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Swarnajit Dey 5 years, 9 months ago

Litchen

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Kenisha Patel 5 years, 9 months ago

Cannine is a type of teeth that helps us in tearing the food

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Ansh Kanojia 5 years, 9 months ago

Name the source from which litmus solution is obtained what is the use of this solution

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About eletromagnet and its uses?

Posted by Vasunthra Pugalenthi 5 years, 9 months ago

CBSE > Class 07 > Science

4 answers

Divyansh Jain 5 years, 9 months ago

Electromagnet is a coil of insulated wire wound around a piece of magnetic material. Electromagnets are used in electric motors and electric bells. They are also used in fans, washing machines, refrigerators, debit cards, credit cards, microphones etc. Very strong electromagnets are used in cranes and factories for lifting heavy iron pieces.

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Swarnajit Dey 5 years, 9 months ago

It is used in electric bell

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Swarnajit Dey 5 years, 9 months ago

It works on magnetic effect of electricity.It is stronger than bar magnet

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Simran Ahden 5 years, 9 months ago

It is used in cranes to pick to junkyard

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what is ruminant animal and give an examples

Posted by Anushka Kumari 5 years, 9 months ago

CBSE > Class 07 > Science

4 answers

Swarnajit Dey 5 years, 9 months ago

Cow is an ruminant animal. He digests food by partially chewing it. It came into their mouth in form of cud

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Karan Singh 5 years, 9 months ago

Animals that chew partially digested food are known as ruminant. Eg:-cow

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Anushka Kumari 5 years, 9 months ago

what is chemical change and give an example

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Anushka Kumari 5 years, 9 months ago

what is ruminant animal and give an example

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Short answer of how forests prevant flods

Posted by Dheirya Narang 5 years, 9 months ago

CBSE > Class 07 > Science

2 answers

Swarnajit Dey 5 years, 9 months ago

Full form of MCB is miniature circuit breaker

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Anushka Kumari 5 years, 9 months ago

full form of m.c.b

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What is canopy?

Posted by Dimpalben Bhadreshbhai. Patel 5 years, 9 months ago

CBSE > Class 07 > Science

2 answers

Diya Patel 5 years, 9 months ago

The uppermost layer of forest is called canopy

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Sunil Sharma 5 years, 9 months ago

Below the emergent layer of forest there is the canopy layer. It has tall, trees with large dark green leaves

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How does the forest maintain the level of gases

Posted by Mansi Bhangale 5 years, 9 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 9 months ago

Plants purify air by utilizing carbon dioxide in the atmosphere. They also maintain a balance between oxygen and carbon dioxide and prevent global warming on earth.

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which type of lens always form virtual image

Posted by Madhu Singh 5 years, 9 months ago

CBSE > Class 07 > Science