CBSE > Class 10 > Science | CBSE Board | Homework Help

Nearsightedness (myopia) is a common vision condition in which near objects appear clear, but objects farther away look blurry. Myopia is caused by the shape of the eye; either the eyeball is slightly too long or the cornea (the clear covering of the front of the eye) is too steeply curved. Myopia is corrected by spectacles or contact lenses with lenses which are 'minus' or concave in shape.

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Sign Convention of Spherical Mirrors and Spherical Lenses??

Posted by Shreya Mishra 3 years ago

CBSE > Class 10 > Science

4 answers

Preeti Dabral 3 years ago

According to the spherical lens, the sign convention is as follows: The object should always be to the left of the lens. All the distances are calculated from the ocular centre of the mirror.

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Arpit Sahu 3 years ago

The sign conventions followed for any spherical mirror are given as: All distances are measured from the pole of a spherical error Distances measured in the direction of incident light are taken as positive while distances measured in a direction opposite to the direction of the incident light are taken as negative.

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Anupam Yadav 3 years ago

SIGN CONVENTIONS: For a mirror or lens, the light rays come into the optical device from one side; let's call this the “IN” side. The light rays leave the mirror or lens on the “OUT” side. For a mirror, the “OUT” side is the same side as the “IN” side; for a lens, it's the opposite.

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Shreya Mishra 3 years ago

I'm not satisfied with this..

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Garbage of Disposal

Posted by Arman Qureshi Sahab 3 years ago

CBSE > Class 10 > Science

1 answers

Anshika Singh 3 years ago

Write full question bro

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How are lungs designed to maximise the area for exchange of gases.

Posted by Harshith M. V 3 years ago

CBSE > Class 10 > Science

3 answers

Tarun Sharma 3 years ago

Lungs have alveoli a baloon like structure it provide a large surface area for gases exchange

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Khushboo Kumari 3 years ago

The presence of millions of alveoli in the lungs provides a large surface area for the exchange of gases. And this availability of a large surface area maximizes the exchange of gases.

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Rohit Soni 3 years ago

Lungs have millions of alveloi that provide large surface area for the exchange of gasses

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How are Oxygen and Carbon dioxide transported in human being

Posted by Harshith M. V 3 years ago

CBSE > Class 10 > Science

5 answers

Vanshika Jain 3 years ago

Glucose+oxygen _ water+carbon dioxide+water+energy

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Vanshika Jain 3 years ago

By process of respiration Carbon dioxide out and Oxygen in

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Tarun Sharma 3 years ago

Carbon dioxide is taken by blood from alveoli and oxygen is taken by alveoli from blood vessels the hemoglobin in blood transfer this in all body parts

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Devank Kaushik 3 years ago

Oxygen and Carobon dioxide is transported in human beings through a process known as respiration. The following gases transport through blood which acts as a carrier of gases, food and waste across the body

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Anushka Chavhan 3 years ago

Respiration

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How a coin float

Posted by Rohan Jangra 3 years ago

CBSE > Class 10 > Science

2 answers

Preeti Dabral 3 years ago

Anything with more density than water will sink in water, but other objects that have less density than water will float. The reason the clay floats in water is because it has less density than water. Archimedes in the fifth century was the first to explain this principle of buoyancy and use it.

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Tarun Sharma 3 years ago

If coin have less density than water then it float

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Dot structure of fluro ethane

Posted by Neha Subba 3 years ago

CBSE > Class 10 > Science

1 answers

Suraj Salvi 3 years ago

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Name any two type of antioxidants.

Posted by Banty Kumari 3 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Rohit Soni 3 years ago

BHA AND BHT

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How many type of chemical reaction

Posted by Banty Kumari 3 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Tarun Sharma 3 years ago

7 types displacement,double dis., exothermic, endothermic, oxidation, reduction,dicomposition, combination, redox

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Jai Varsha 3 years, 1 month ago

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Harshitha Harshitha 3 years, 1 month ago

There are 7 types of chemical reactions.They are Combination reaction Exothermic reaction Endothermic reaction Decomposition reaction Displacement reaction Double Displacement reaction Precitation reaction

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Why is the variation beneficial to the species but not necessarily for the individual?

Posted by Anshika Sharma 3 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Priya Kumari 3 years ago

Because different species have different variations. They can not survive in high temperature but their individual can survive due to variations. E.g. Bacteria,their species survive in high tempt.but their parents can't survive . Because parents have not variations as their species.

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Jai Varsha 3 years, 1 month ago

Because variations is different in different species. They cannot survive in high temperature bit their species does bcoz of variations. Ex: Bacteria, their species can survive in high temperature bcoz they have variations but their parent doesn't hace variations so the may die.

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Muzaif Ur Rahman 3 years, 1 month ago

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If the refractive indices for water and diamond relative to air are 1.33 and 2.4 respectively, then the refractive index of diamond relative to water is-

Posted by Amani Sofiya 3 years ago

CBSE > Class 10 > Science

1 answers

Preeti Dabral 3 years ago

refractive index of diamond relative to water is

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The refractive index of glass and water with respect to air are 2/3 and 4/3 respectively. If speed of light in glass is 2*10power 8m/s find the speed of light in water

Posted by Mannat Handa 3 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Rohit Soni 3 years ago

Then speed of light in air to that of speed of in water That is , C/v 1.33=3*10^8/v V=3*10^8/1.33 V=2.25*10^8

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Rohit Soni 3 years ago

Refractive index of water w.r.t air is 4/3 so we can write it in the form of 1.33

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Adviti wanted to test that carbon dioxide is absorbed by the plant so she put up an experiment set up. But she forgot to keep watch glass containing potassium hydroxide in set up B. What did she observe.

Posted by Tanushree Jagadish 3 years, 1 month ago

CBSE > Class 10 > Science

0 answers

ANSWER

solid sodium carbonate is added to ethanoic acid..

Posted by A B 3 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Tarun Sharma 3 years ago

CH3COOH+NA2CO3=CH3COONA+H2O+CO2

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Jai Varsha 3 years, 1 month ago

2CH3COOH+NA2CO3---> 2CH3COONA+H20+CO2

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Muzaif Ur Rahman 3 years, 1 month ago

2CH3COOH+NA2CO3---> 2CH3COONA+H20+CO2

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Mohit heated ethanol with a compound A In presence of a few drops of concentrated sulphuric acid and observe a sweet smelling compound B Is formed. When B Is treated with sodium hydroxide it gives back ethanol and a compound C identify A and C give one use each of compounds A and B. write the chemical reaction involved. and name the reaction.

Posted by Shivam Chaudhary 3 years, 1 month ago

CBSE > Class 10 > Science

2 answers

A B 3 years, 1 month ago

Uses:- A- dilute solution used as vinegar in cooking/ preservative in pickles. B – making perfumes, and flavouring agents.

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A B 3 years, 1 month ago

(a) A is an Ethanoic acid. (b)C is Sodium salt of ethanoic acid/sodium ethanoate.

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Which wavelength is most affected due to atmospheric refraction?

Posted by Sakshi Tripathi 3 years, 1 month ago

CBSE > Class 10 > Science

4 answers

Varsha Rani 3 years ago

Violet 🙂

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Vaidika Sharma 3 years, 1 month ago

Voilet

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Mohanraj Gunaseelan 3 years, 1 month ago

Violet sister

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Satvik Rai 3 years, 1 month ago

Voilet

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The science

Posted by Arshad Khan 3 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Dharun Prakash K 3 years ago

😠😠😠

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Q. What is the main functions of human digestive system?

Posted by Keshav Kumar 3 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Khushi Asthana 3 years, 1 month ago

The main function of human digestive system is break down of food partical into a smaller pieces . And those smaller food partical are used to get a energy for body growth and development.

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Niharika Chowdary J P 3 years, 1 month ago

Breaks the nutrients into smaller parts and those nutrients are used as energy , for growth and other bofy purpose.

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6 ch

Posted by Rohit Kumar Rohit Kumar Singh 3 years, 1 month ago

CBSE > Class 10 > Science

0 answers

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Can anybody please suggest any good video for heredity chapter

Posted by Rudraksha More 3 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Anurag Shahi 3 years, 1 month ago

Study heridity from pw by bhagyashree mam

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Aryan Arora 3 years, 1 month ago

Study for magnet brain🙂

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Keshav Kumar 3 years, 1 month ago

Study from pw

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Rohit Kumar Rohit Kumar Singh 3 years, 1 month ago

Maths ex 9.1

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Kasak Arora 3 years, 1 month ago

Toppr study channel pe dekho

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Artery,veins different

Posted by Priyanshu Priyanshu Kumar 3 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Preeti Dabral 3 years, 1 month ago

Arteries carry blood away from the heart, and veins carry blood towards the heart. With the exception of pulmonary blood vessels, arteries carry oxygenated blood and veins carry deoxygenated blood. Arteries have thick walls with muscle tissue. Veins have thinner walls and use valves to keep your blood flowing.

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Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds ?

Posted by Niharika Chowdary J P 3 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Preeti Dabral 3 years, 1 month ago

Separation of oxygenated and deoxygenated blood helps in efficient supply of oxygen to the body. This system is useful in animals that have high energy requirement such as mammals and birds constantly need oxygen to get energy to maintain constant body temperature and homeostasis.

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Rupali Shukla 3 years ago

Because oxygen is important for breakdown of food then we get energy and di oxygenated blood that is carbon dioxide which is harmful gas for living organism

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Sakshi Tripathi 3 years, 1 month ago

Bcoz mammals and birds need a lot of energy to do their work

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Bulb will not glow because electrolyte is not acidic is right or wrong

Posted by Ranveer Sandhu 3 years, 1 month ago

CBSE > Class 10 > Science

2 answers

A B 3 years, 1 month ago

Bulb will be glow in strong acid and strong base....

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Shubham Pathak 3 years, 1 month ago

Wrong !!! Bulb will not glow in that situation because of the absence of ions in it (like sugar solution)

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Why we store silver chloride in dark coloured bottle?

Posted by V B 3 years, 1 month ago

CBSE > Class 10 > Science

4 answers

Dharun Prakash K 3 years ago

When we kept that in sunlight it undergo photochemical reaction that separates sliver and cl² gas

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Tarun Sharma 3 years ago

Beacuse silver chloride decompose in sunlight and turn grey

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Omya Aryan 3 years, 1 month ago

When silver chloride is exposed to the sun, then the compound react with air and decomposes into silver and chlorine.

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Shubham Pathak 3 years, 1 month ago

Because silver chloride is a light sensitive material, which when get in contact of light then photolysis happens

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Is electromagnetic induction coming? If not then why Is it at sample paper?

Posted by M M 3 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Omya Aryan 3 years, 1 month ago

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M M 3 years, 1 month ago

Coming or not

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Shubham Pathak 3 years, 1 month ago

Yes

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Eddie wants to have a virtual magnified image of an object placed 30 cm from a concave mirror ? (1) Calculate the focal length of the mirror to be used which can form an image four time the size of image (2) find the position of image if the image is real

Posted by Ayush Sarkar 3 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Shubham Pathak 3 years, 1 month ago

If the image is virtual then : Hi -V -- = -- Ho U => -v = (-30 )* 4 => v = 120 Then, 1/f = 1/v +1/u 1/f = 1/120 + 1/30 => 1 - 3 ----- 120 => 1/40 => f = 40 cm

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What is role of brain in reflex action? These que.is ask all the 10 student

Posted by Dhwani Panchal 3 years, 1 month ago

CBSE > Class 10 > Science