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

Permanent magnet are made from "hard" ferromagnetic material such as alnico and ferrite that are subjected to special processing in a strong magnetic field during manufacture to align their internal microcrystalline structure making them very hard to demagnetiz ☺️☺️☺️

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What is the working of motor ( need ans which is easy to understand)????

Posted by Sana(Silent Love).. ?? 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Drift? Boi? 5 years, 5 months ago

Hi sanket

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Lucifer?? Morningstar?? 5 years, 5 months ago

A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it. A force acts on the coil which rotates it continuously

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Drift? Boi? 5 years, 5 months ago

Waise book nikal ke likhe hai

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Drift? Boi? 5 years, 5 months ago

Sorry lamba ho gaya

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Drift? Boi? 5 years, 5 months ago

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. Electric motors can be powered by direct current (DC) sources, such as from batteries, motor vehicles or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical generators. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.

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Properties of concave and convex lens

Posted by Anushka ?? 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Drift? Boi? 5 years, 5 months ago

Are nahi aisa kab bole hum majak hi to kiye sorry sanket humko jaan se mar dega plzz...???

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Anushka ?? 5 years, 5 months ago

Thik h toh do din baad hi aati hu ok khush

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Drift? Boi? 5 years, 5 months ago

Tum boli thi ki hum 2 din nahi aa payenge

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Anushka ?? 5 years, 5 months ago

Ok thanks ??

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Drift? Boi? 5 years, 5 months ago

A convex lens or converging lens focuses the light rays to a specific point whereas a concave lens or diverging lens diverges the light rays. A lens is a transparent material (either curved or flat surface) based on the principles of refraction.

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Properties of convex mirror

Posted by Anushka ?? 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Anushka ?? 5 years, 5 months ago

Ayush*

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Anushka ?? 5 years, 5 months ago

Thanks sanket and atush?

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Lucifer?? Morningstar?? 5 years, 5 months ago

1) it is a diverging mirror (2) it always gives virtual and erect image (3) it always formed between F and P

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Anushka ?? 5 years, 5 months ago

Thanks

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Drift? Boi? 5 years, 5 months ago

Opposite of bunny's answer .

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Properties of concave mirror

Posted by Anushka ?? 5 years, 5 months ago

CBSE > Class 10 > Science

4 answers

Jagrati Sharma?? 5 years, 5 months ago

Ap sab ek hi school mein h right

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Anushka ?? 5 years, 5 months ago

Ok add baad mei karungi

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Anushka ?? 5 years, 5 months ago

Thanks sanket

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Lucifer?? Morningstar?? 5 years, 5 months ago

1) it make always real and inverted image. 2) it is a converging mirror.

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Anyone know ARCHAangle ?

Posted by Drift? Boi? 5 years, 5 months ago

CBSE > Class 10 > Science

4 answers

? Pranali.A.P ? 5 years, 5 months ago

What ?? ?

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Drift? Boi? 5 years, 5 months ago

Yeh word tumhare liye

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? Pranali.A.P ? 5 years, 5 months ago

An archangel is an angel of high rank. The word "archangel" itself is usually associated with the Abrahamic religions, but beings that are very similar to archangels are found in a number of religious traditions

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Drift? Boi? 5 years, 5 months ago

Koi nahi janta

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What do u mean by leptin ???

Posted by Drift? Boi? 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

? Pranali.A.P ? 5 years, 5 months ago

Mai to mere ghr pe hu (aap kaha ho ??)??

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Drift? Boi? 5 years, 5 months ago

Aap kaha se hai

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? Pranali.A.P ? 5 years, 5 months ago

Hello ?

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Drift? Boi? 5 years, 5 months ago

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? Pranali.A.P ? 5 years, 5 months ago

Leptin is a hormone secreted from fat cells that helps to regulate body weight. The name leptin is derived from the Greek word 'leptos' meaning thin. It is sometimes referred to as the 'Fat Controller'.

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Does permanent magnet is made up of steel

Posted by Bimal Borah 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Drift? Boi? 5 years, 5 months ago

No, all the magnet are madeup of iron , Nickel and Cobalt expect the the natural magnet .

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✍️ A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it (a) goes straight into the second medium (b) bends towards the normal (c) bends away from the normal (d) does

Posted by ? Pranali.A.P ? 5 years, 5 months ago

CBSE > Class 10 > Science

4 answers

? Pranali.A.P ? 5 years, 5 months ago

Kuch nhi ayvehi ?

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Sana(Silent Love).. ?? 5 years, 5 months ago

When u r saying yss

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Sana(Silent Love).. ?? 5 years, 5 months ago

Hiii pranali why u have used this emoji ( ?)

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Study Lover ?‍? ?‍? 5 years, 5 months ago

Bends away from the normal.

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✍️ If the image is formed in front of the mirror, then the image distance will be (a) positive or negative depending on the size of the object (b) neither positive nor negative (c) positive (d) negative

Posted by ? Pranali.A.P ? 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Srishtika Murugan 5 years, 5 months ago

Negative

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Study Lover ?‍? ?‍? 5 years, 5 months ago

Negative.

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ANSWER

White three important properties of aluminium which are responsible for its great demand in industry?

Posted by AรЂutøรЂ Kůmåř 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

AรЂutøรЂ Kůmåř 5 years, 5 months ago

Thanx ??????

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Yogita Ingle 5 years, 5 months ago

The properties of aluminium metal responsible for its great demand in industry are :
(i) The metal is a good conductor of electricity.
(ii) The metal is not attacked by water.
(iii) The metal is a powerful reducing agent.

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What is electrostatic force. And what is its formula ? What does q and Q mean in that formula. Please somebody tell me. ????????????????

Posted by Kyōka ( Demon Snow ) 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Kyōka ( Demon Snow ) 5 years, 5 months ago

Thank you bunny ? ? ??.

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Lucifer?? Morningstar?? 5 years, 5 months ago

F=KqQ/r² Here,q and Q are charge of any particle

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Lucifer?? Morningstar?? 5 years, 5 months ago

Electrostatic forces are attractive or repulsive forces between particles that are caused by their electric charges.

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ANSWER

Where would you find the sea of tranquility ?☺️☺️❓❓

Posted by Ishika ? 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

AรЂutøรЂ Kůmåř 5 years, 5 months ago

Mare Tranquillitatis (Latin tranquillitātis, the Sea of Tranquillity or Sea of Tranquility; see spelling differences) is a lunar mare that sits within the Tranquillitatis basin on the Moon.

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

Hi ???♥️♥️♥️♥️

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Ishika ? 5 years, 5 months ago

Thank you mr.avi kota????

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

❤️❤️❤️❤️❤️❤️❤️❤️❤️???????????

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

Mare Tranquillitatis Latin tranquillitātis, the Sea of Tranquillity or Sea of Tranquility; see spelling differences) is a lunar mare that sits within the Tranquillitatis basin on the Moon. On celestial object: Moon

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What is Quantum mechanics, plank length, planks constant and plank time ??????? Please somebody tell me. ???

Posted by Kyōka ( Demon Snow ) 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Ishika ? 5 years, 5 months ago

I am fine what about you....☺️☺️☺️

1Thank You

Kyōka ( Demon Snow ) 5 years, 5 months ago

How are you Ishika ?

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Kyōka ( Demon Snow ) 5 years, 5 months ago

No problem ishika. Thank you. It is also very helpful ??. ??

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Ishika ? 5 years, 5 months ago

Sorry aage ka pta nai.....???

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Ishika ? 5 years, 5 months ago

Quantum mechanics -- ?is the body of scientific laws that describe the behaviour of protons, electrons and the other particles that make up the our beloved universe ☺️☺️☺️

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I am like a ? ribbon, tied by nature, across the sky. Who am I ??❓❓❓

Posted by Ishika ? 5 years, 5 months ago

CBSE > Class 10 > Science

4 answers

Kyōka ( Demon Snow ) 5 years, 5 months ago

Nice answer Ishika. ??.

2Thank You

Ishika ? 5 years, 5 months ago

Ok as you wish mr.avi????? and the answer is RAINBOW ?

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Ishika ? 5 years, 5 months ago

Think and answer...... ?☺️☺️

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

I can't understand ❤️?‍♀️?‍♀️?‍♀️☹️☹️☹️?????

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Atomic hydrogen has a life period of.........?❓❓

Posted by Ishika ? 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Ishika ? 5 years, 5 months ago

Thank you...☺️☺️

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?Prashant? ?Umarani? 5 years, 5 months ago

Approx 0.3 sec

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

Welcome

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Ishika ? 5 years, 5 months ago

Thanks??

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

The life span of hydrogen is approximately 0.3 sec.

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What colour is a Himalayan poppy??❓

Posted by Ishika ? 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Kyōka ( Demon Snow ) 5 years, 5 months ago

Your welcome ?? Ishika. ???

2Thank You

Ishika ? 5 years, 5 months ago

Thanks both of you...??☺️☺️

3Thank You

Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

True blue flowers are rare in the natural world, but the Himalayan blue poppy is an exception. It derives its blue color from the pigment delphinidin combined with the plant's ability to maintain acidic conditions inside the plant cells. Higher classification: Meconopsis ❤️❤️❤️????‍♀️❤️

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Kyōka ( Demon Snow ) 5 years, 5 months ago

Himalayan poppy is of blue colour. ???????. Hi Ishika.

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Nancy Singh 5 years, 5 months ago

Nice

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Write about why transportation of materials is necessary in animals

Posted by B.Aishwarya 203 Kalyannagar 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 5 months ago

Transport of materials is necessary in both plants and animals as every cell needs a regular supply of nutrients and oxygen for releasing energy through respiration.
The food that we eat is broken down into smaller components to be absorbed by the cells. The oxygen that we inhale is also transported to all the cells of the body. Our body also requires a constant removal of waste from the body.

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Should the resistance of an ammeter be low or high ?give reason

Posted by Prakash Pant 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 5 months ago

1. Ammeter is used to measure the current in a circuit and it should always be connected in series.
2. Resistance means the obstruction caused to the movements of electrons.
3. If resistance is more, current will be less.
4. So, if ammeter has a high resistance than the current measured will be quite less as compared to actual current which is undesirable.
5. If a ammeter has zero resistance , then we will get exact current in the circuit.
6. But such thing is not possible as every material in this world has some internal resistance.

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ANSWER

How metals and non metals react?

Posted by Utsav Srivastava 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 5 months ago

1	Reaction with Oxygen	Metal + Oxygen→Metal oxide 4Na(s) + O₂(g) →2Na₂O(s) 4Al(s) + 3O₂(g) →2Al₂O₃ Metals form basic oxides Zn and Al form amphoteric oxides (they show the properties of both acidic and basic oxides) Most of the metal oxides are insoluble in water Some of them dissolve to form Alkali Na₂O(s) + H₂O(l) →2NaOH(aq)	Non-metal + Oxygen →Non-metal oxide C + O₂ →CO₂ S + O₂ →SO₂ Non-metals form acidic oxides CO and HO₂O are neutral oxides(they are neither acidic nor basic in nature) Non- metal oxides are soluble in water They dissolve in water to form acids SO₂ + H₂O →H₂SO₃
2	Reaction with water	Metals react with water to form metal oxides or metal hydroxide and H2 gas is released. 2Na(s) + 2H₂O(l) →2NaOH + H₂(g) + heat	Non-metals do not react with water, steam to evolve hydrogen gas. Because Non-metals cannot give electrons to hydrogen in water so that it can be released as H₂ gas.
3	Reaction with dilute Acids	Metal + Acid →Metal salt + Hydrogen HCl Mg(s) + 2HCl(aq)→ MgCl₂(aq) + H₂(g) H₂SO₄ 2Na(s) + H₂SO₂→ Na₂SO₄(aq) +H₂(g) HNO₃ Metal + HNO₃→ H₂ gas is not displaced. Reason- HNO₃ is strong oxidizing agent.	Non-metals do not react with acids to release H₂ gas Reason- Non-metals cannot loose electrons and give it to Hydrogen ions of acids so that the gas is released. Mn + 2HNO₃→ Mn(NO₃)₂ + H₂ H₂ gas from HNO₃
4	Reaction with salt solutions	When metals react with salt solution, more reactive metal will displace a less reactive metal from its salt solution. CuSO₄(aq) + n(s)→ ZnSO₄(aq) + Cu(s)	When non-metals react with salt solution, more reactive non-metal will displace a less reactive non-metal from its salt solution. 2NaBr(aq) + Cl₂(g)→ 2NaCl(aq) + Br₂(aq)

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What is reproductive system tell me uses of reproductive system

Posted by Ac4191 Kalesh R Kudalli 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

? Pranali.A.P ? 5 years, 5 months ago

The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system.[1] Unlike most organ systems, the sexes of differentiated species often have significant differences. These differences allow for a combination of genetic material between two individuals, which allows for the possibility of greater genetic fitness of the offspring.

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? Pranali.A.P ? 5 years, 5 months ago

the reproductive system has four functions: To produce egg and sperm cells To transport and sustain these cells To nurture the developing offspring To produce hormones

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Bhai log mujhe koi aisa app btao jisme science ka best notes ho jisme sare topics cleared ho jo mujhe exam preparation me kaam aaye

Posted by Rounak Anand 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Study Lover ?‍? ?‍? 5 years, 5 months ago

Making self notes is best.It helps you to quick revise.It also clears your all concept.You should make your notes with help of NCERT books, reference books.You can take help with teachers and friends.??

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Aditya Chaturvedi 5 years, 5 months ago

Unacadamy

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Ishika ? 5 years, 5 months ago

Vedantu

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? Pranali.A.P ? 5 years, 5 months ago

BYJU'S

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? Pranali.A.P ? 5 years, 5 months ago

BYJ'S

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()

Posted by Testing Testing1 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Sana(Silent Love).. ?? 5 years, 5 months ago

What?????????

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Drift? Boi? 5 years, 5 months ago

Braket

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? Pranali.A.P ? 5 years, 5 months ago

What???

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K2Cr2O7 + 2KOH ➡️ H2O + 2Kr2CrO4 What type of reaction is this? Combination, decomposition, displacement or redox?

Posted by Divija Bansal 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Divija Bansal 5 years, 5 months ago

which is the less reactive and the more reactive metal here?

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Abhinav More 5 years, 5 months ago

Displacement

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How to find pH of salts?

Posted by Vivek Vinod 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

? Pranali.A.P ? 5 years, 5 months ago

To calculate the pH of a salt solution one needs to know the concentration of the salt solution, whether the salt is an acidic, basic, or neutral salt, the equation for the interaction of the ion with the water, the equilibrium expression for this interaction and the Ka or Kb value.

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कपिल मुनि एक महापुरुष थे।(मिश्र वाक्य बनाओ)

Posted by Amanjeet Gupta 5 years, 5 months ago

CBSE > Class 10 > Science