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

Bases: ◆ Sodium hydroxide is used in the manufacturer of soap, paper and making rayon. ◆Calcium hydroxide is used in manufacturer of bleaching powder. ◆ sodium carbonate used for softening water.

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Shreya .... 6 years, 3 months ago

Acids: ◆ sulphuric acid is used in manufacturer of fertilisers. ◆ HCl is used for removing oxide film from steel objects.

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Shreya .... 6 years, 3 months ago

Salts: ◆NaCl is used in cooking food, used as preservative in pickles. ◆ washing soda is used as cleansing agent and removing permanent hardness of water.

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ANSWER

Science brain me jati hi nahi

Posted by Harsh Darbar 6 years, 3 months ago

CBSE > Class 10 > Science

15 answers

Sarvagya Porwal 6 years, 3 months ago

To tumhara brain kharab hai

1Thank You

Shreya .... 6 years, 3 months ago

Hmm..bye..

3Thank You

Harsh Darbar 6 years, 3 months ago

Ok bye Bad me padenge

1Thank You

Shreya .... 6 years, 3 months ago

Metals and non metals poora samjhana padega kya..??

2Thank You

Harsh Darbar 6 years, 3 months ago

Metals and non metals Magnetic effect of electric current

1Thank You

Shreya .... 6 years, 3 months ago

Ok..kon sa chapter ni aa rha samjh me..

2Thank You

Harsh Darbar 6 years, 3 months ago

Chemistry and physics

2Thank You

Harsh Darbar 6 years, 3 months ago

Chemistry

2Thank You

Shreya .... 6 years, 3 months ago

Kon sa part ni jata..physics..chemistry ya biology..

3Thank You

Harsh Darbar 6 years, 3 months ago

Kuch kuch

2Thank You

Shreya .... 6 years, 3 months ago

Kuch bhi ni smajh me aata kya..kuch toh jati hogi science brain me..??

3Thank You

Harsh Darbar 6 years, 3 months ago

Kese

2Thank You

Shreya .... 6 years, 3 months ago

Kya ni jata..mai help kr skti hu..

3Thank You

Harsh Darbar 6 years, 3 months ago

Kese jayegi

3Thank You

Shreya .... 6 years, 3 months ago

Jarur jayegi..brain me..?

4Thank You

ANSWER

Cbse class 10 science paper is easy or difficult.

Posted by Harsh Darbar 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Shreya .... 6 years, 3 months ago

Kya ni smajh me aata..physics..chemistry..or biology..

3Thank You

Harsh Darbar 6 years, 3 months ago

Kese kare Science samajh me nahi aata

1Thank You

Shreya .... 6 years, 3 months ago

No..not difficult..just do practise..? study well..I will be easy for you

2Thank You

ANSWER

Why a change in speed of light causes refraction of light...???

Posted by Aadya Singh ? 6 years, 3 months ago

CBSE > Class 10 > Science

8 answers

Shreya .... 6 years, 3 months ago

My pleasure bestie..

3Thank You

Aadya Singh ? 6 years, 3 months ago

Thanks to all...?

1Thank You

Abishek Gupta 6 years, 3 months ago

Due to the property of that when a ray of light move from rarer to denser it bends towards the normal

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...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Noo alok broo both phenomenon is 100% ryt........and if you want explanation then I can't ryt now ...you will obviously ..study about it in 12 th...and now I m in 11th... that's why.

2Thank You

Alok Raj 6 years, 3 months ago

Speed of light does not cause refraction bro.. Refraction happens only when light enters in a different medium.

3Thank You

Shreya .... 6 years, 3 months ago

A beam of light is made up of tiny waves. Whenever a beam of light consisting of light waves in a certain medium falls obliquely on the boundary of another medium, then one part of light waves enters into other medium first and its speed changes first but rest of waves enter the other medium a little later. So, it speed changes and causes refraction.

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...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

**light

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...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Refraction of life is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. ... Since the light speed changes at the interface, the wavelength of the light must change

3Thank You

ANSWER

Process of aerobic respiration in mitochondria of cell

Posted by Ojasvi Yadav 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Sarvagya Porwal 6 years, 3 months ago

3 carbon molecule pyruvate break down into glucose

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ANSWER

An unsaturated hydrocarbon having triple covalent bond has a 50 hydrocarbon atoms in its molecules.The number of carbon atoms in its molecules will be

Posted by Aradhana Singh 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Aradhana Singh 6 years, 3 months ago

Okk

0Thank You

Gaurav Seth 6 years, 3 months ago

Answer: 26
The general formula for unsaturated hydrocarbons with triple bond, is C_nH_2n-2. Where 'n' is the number of atoms in one molecule. If the number of hydrogen atoms in its molecule is 50, then the number of carbon atoms should be 26 (2n-2 = 50; therefore, n = 26).

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ANSWER

What is cell division???

Posted by Vatan Arya 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Sarvagya Porwal 6 years, 3 months ago

Jab cell ke tukde hone par bo do ya do se jada me bikhar jaye

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Aadya Singh ? 6 years, 3 months ago

The process by which parents is divided into two or more daughter cells.

4Thank You

ANSWER

Basic difference between mirror and lens

Posted by Shubham Kumar Modanwaal 6 years, 3 months ago

CBSE > Class 10 > Science

5 answers

Sarvagya Porwal 6 years, 3 months ago

Mirror ko ek taraf se polish hova aur lens sabro aar paar dikhe

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Ashish Raj 6 years, 3 months ago

And mirror me reflection hota hai sirf and lens me reflection and refraction dono hota hai

1Thank You

Ashish Raj 6 years, 3 months ago

Bhai mirror ka ek hi side reflect karta hai and lens ka dono side refract karta hai

0Thank You

Lovish Yadav 6 years, 3 months ago

One more difference ,there structure are uniqe and gave different diaghram

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Kuldeep Nagar 6 years, 3 months ago

Mirror works on the principal of reflection whereas lens works on the principal of refraction ???

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ANSWER

Define plankton and zooplankton

Posted by Arshdeep Singh 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Arshdeep Singh 6 years, 3 months ago

The microscopic aquatic plant freely floating on the surface of water are known as planktons and The microscopic aquatic animals freely floating on the water are known as zooplankton. Thanks ✋✋

1Thank You

ANSWER

how can we convert 24 carat gold into 18 carat gold

Posted by Aryan Sharma 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

24-carat gold is pure gold. Pure gold is very soft and not suitable for making jewellery.
Therefore, to increase its hardness, it is alloyed either with copper or silver.
18-carat gold is prepared by alloying 18 parts pure gold with 6 parts of either copper or silver.

2Thank You

ANSWER

State the advantages of sexual reproduction over asexual reproduction

Posted by Anwesha Boruah 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

Advantages of sexual reproduction are-
(i) Genetic diversity is the main advantage.
(ii)Better chance of survival since there is a lower number of offspring.
(iii)Increase in the ability of an organism to adapt to the environment.

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ANSWER

How do our eye lens have colour, even when we get real images?

Posted by Nishchint Patara 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Varun Kumar 6 years, 3 months ago

Due to some proteins

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ANSWER

What is the kinetic molecular theory of gas?

Posted by Vishal Saini 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Several electric bulbs designed to be used on a 220 V electric supply line are rated 10 W how many lamps can be connected in parallel with each other across the two wires of 220V line if the maximum allowable current is 5 A

Posted by Muskan Sharma 6 years, 3 months ago

CBSE > Class 10 > Science

4 answers

Muskan Sharma 6 years, 3 months ago

Thanks:)

0Thank You

Aadya Singh ? 6 years, 3 months ago

Given, V = 220V , P = 10 W, I = 5 A. So, R = V^2/P = (220)^2/10 = 4840 ohm. Now, suppose 'n' number of bulb be connected in parallel with each other. Then, their equivalent resistance will be : 1/R = 1/4840 + 1/4840 +.....+ n times => 1/R = n/4840 => R = 4840/n ohm .......(1). Now, using ohm law, R = V/I => R = 220/5....(2). By putting the value of (1) in (2) , we get , 4840/n = 220/5 => n = (4840×5)/220 => 110.

3Thank You

Muskan Sharma 6 years, 3 months ago

Can you please send me the detailed answer

2Thank You

Aadya Singh ? 6 years, 3 months ago

110 lamps.

3Thank You

ANSWER

What is Octet?

Posted by ...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Thnx Ingle mam

0Thank You

Yogita Ingle 6 years, 3 months ago

The Octet rule is a chemical rule of thumb that states that atoms of main- group element tends to combine in such way that each atom has eight electrons in its valence shell giving it the same electronic configuration as a noble gas.

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ANSWER

What is mean by corrosion

Posted by Two Boys Gaming 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

When some metals are exposed to moisture, acids etc., they tarnish due to the formations of respective metal oxide on their surface. This process is called “corrosion”.
Example: (1) 4Ag + 2H₂S + O₂→ 2Ag₂S + 2H₂O
(2) 2Cu + O₂ → 2CuO

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ANSWER

Five character of period

Posted by Zoya Khan 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Kuldeep Nagar 6 years, 3 months ago

Valency first increases and then decreases . Valence electron increases . Atomic size reduces . Non metallic character increases .

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ANSWER

What precautions should be taken to measure the dependence of voltmetre?

Posted by Ankita Gupta 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Ankita Gupta 6 years, 3 months ago

Tnq yogita

0Thank You

Yogita Ingle 6 years, 3 months ago

1. We must follow the instructions carefully during the experiment.

2. Do not connect (or place) the multimeter (leads/pins at the end of wires) directly to the ends of battery, when it is in current mode. It can damage the meter.

3. We must estimate approximately the range for resistances being used. We must have the appropriate ranges for the voltage and/or current sources. We should not choose a resistor of low resistance, because too high current may damage equipment. It may even burn the resistor wire or your hands.

4. Connect the wires neatly and tightly. Loose connections can give wrong readings.

5. Switch on the battery when reading current and voltage. As soon as they are done, switch off. That saves power as well as it stops the resistor from over heating. Allow for the resistor to cool down to room temperature before taking the next reading.

6. Check the temperature of the resistor to be at room temperature at the time of reading meters. Resistance increases with temperature. It is useful to immerse most of the resistor in water while doing the experiment. Water will maintain the same temperature. Measure the temperature also. So that it can be reported along with other results.

7. Take a number of readings for different lengths of the wire or different samples of the resistor of different shapes and weight.

2Thank You

ANSWER

Definition of acclimatisation

Posted by Ashwani Sagoo 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Acclimatisation is the Adjustment to the Change in Environment.... As for eg.. whenever you go hilly regions you will feel lacks of oxygen ....but instead your body have a particular system which can control it and you can Adjust there...

2Thank You

ANSWER

cell digram of period table

Posted by Manoj Agrawal 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Muskan Malik 6 years, 3 months ago

Hlo guys

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ANSWER

figure shows a Ray of light as it travels from medium a to medium be effective index of the medium be related to will they is

Posted by Rishabh Jain 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Vishwajeet Mahto 6 years, 3 months ago

I'll in h UK I'm

1Thank You

Gaurav Seth 6 years, 3 months ago

Q : Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is

A :

Refractive Index of B with respect to A

=(sin i)/(sin r)

=(sin 60)/(sin45)

=( √3 /2)/(1/ √2)

= √6/2

=1.225

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ANSWER

How the blood circulation in heart??

Posted by Vansh Goswami 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is diameter of ova egg

Posted by Dεερακ Ȿιηɠꜧ 6 years, 3 months ago

CBSE > Class 10 > Science

4 answers

Dεερακ Ȿιηɠꜧ 6 years, 2 months ago

0.15 mm

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Lucifer ? Morningstar? 6 years, 3 months ago

0.1mm

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Lavish Kumar 6 years, 3 months ago

0.5 mm

1Thank You

Aadya Singh ? 6 years, 3 months ago

0.1 mm

1Thank You

ANSWER

At what rate event should be projected to have a clear image

Posted by Aman Kumar Yadav 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

P is a cell in human body which is sensitive to particular type of stimulus And conveys the message to cns through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instruction sent from the CNS through nerves S (a) What is P ? Name five organs which contain cells like P . (b) Name the nerve Q. (c) What is R? Give two example of R. (d) Name nerves S. (e) How do massage travels through the nerves Q and S?

Posted by Navya ????‍?❤ 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

P- Neuron ...Q-- sensory neuron....R- may be part of brain ??? ...S-Motor neuron.....and Message travel From Q - Sensory ..received from stimuli ....and goes to brain and Identify here and respond through CNS by S - motor neuron to the body part....??and for much more better you should have to remember ?? REFLEX ARC??

2Thank You

ANSWER

Describe the electronic structure of methane and carbon dioxide.

Posted by Akanksha Kumari? 6 years, 3 months ago

CBSE > Class 10 > Science

5 answers

Shreya .... 6 years, 3 months ago

Aap show kr dena..mai yaha pic ni bhej skti isliye ni send ki..

2Thank You

Akanksha Kumari? 6 years, 3 months ago

I thought isme electron dot structure v show karna hai

1Thank You

Shreya .... 6 years, 3 months ago

With oxygen, carbon forms carbon dioxide. To attain electronic configuration of nearest noblr gas, carbon needs 4 electrons and oxygen needs 2 electrons. In CO2, each atom shares 2 electrons with carbon. Electronic configuration of carbon is 2, 4 and of oxygen is 2,6. O=C=O.

5Thank You

Akanksha Kumari? 6 years, 3 months ago

Likhu

3Thank You

Akanksha Kumari? 6 years, 3 months ago

Koi to btao isme kya likhi

3Thank You

ANSWER

Can someone explain me what is aperture?

Posted by Sahil ???? 6 years, 3 months ago

CBSE > Class 10 > Science

10 answers

Lavish Kumar 6 years, 3 months ago

It is the reflecting surface of mirror

1Thank You

❄️ Queen ❄️ 6 years, 3 months ago

Hii

1Thank You

Gurvinder Kaur 6 years, 3 months ago

aperture is daimeter of spehere which is part of the mirror

2Thank You

Supriya Pandey 6 years, 3 months ago

In simple words, aperture is size of the mirror

2Thank You

Aadya Singh ? 6 years, 3 months ago

Why did u ask when u know the answer...????

4Thank You

Akanksha Kumari? 6 years, 3 months ago

The effective width of mirror through which reflection takes place is called aperture.

3Thank You

Shreya .... 6 years, 3 months ago

Apne khud hi answer de diya..

4Thank You

Sahil ???? 6 years, 3 months ago

Is it the diameter of the mirror or the reflecting surface of mirror

4Thank You

Aadya Singh ? 6 years, 3 months ago

The portion of the mirror from which reflection if light actually takes place is called aperture of mirror.

4Thank You

Shreya .... 6 years, 3 months ago

It is the part of a lens which is the effective diameter of its light transmitting area.

4Thank You

ANSWER

Formula for obtaining number of images in even and odd cases.

Posted by Rishabh Raj 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

How do auxin promote the growth of a tendril around a support

Posted by Manisha Dhibar 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

Auxin helps in the development of tendril around any support. Auxins are produced in the apices or terminal end of a stem or roots. The hormone of plant Auxins helps in the growth of plants by elongating the cells of plant.
When the thread like structure called the tendril comes in touch with any kind of support, auxin begins stimulating the cells present on the alternate region to grow very fast. And due to this, the tendril coils around the support.

1Thank You

ANSWER

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