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https://www.jagranjosh.com › articles Web results CBSE Class 10 Science Sample Paper for Term 1 Board Exam 2021-22 (with Answers and Marking Scheme) - Jagran Josh Go through this link👆🏻

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ANSWER

Which of these carry blood back to the heart?

Posted by Priya 2 days ago

CBSE > Class 10 > Science

5 answers

Trupti Toke 1 day, 8 hours ago

Pulmonary viens

1Thank You

Ansh Yadav 1 day, 17 hours ago

pulmonary vein

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Neha Roy 1 day, 21 hours ago

Pulmonary vein

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Nisha Parmar 1 day, 21 hours ago

pulmonary vein

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Harshit Bhandary 1 day, 23 hours ago

Veins

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ANSWER

What is the colour of phenolphthalein in acidic solution

Posted by Rahul Raj 2 days, 6 hours ago

CBSE > Class 10 > Science

5 answers

Ripan Abc 1 day, 22 hours ago

Colourless

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Komal Yadav 2 days, 4 hours ago

No change

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Bishnudatta Mahapatra 2 days, 6 hours ago

No Color change will happen in acidic solutions.

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Rahul Raj 2 days, 6 hours ago

Ok thanks

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Ishita 💜 2 days, 6 hours ago

Colourless

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ANSWER

magnesium ribbon has a coating of what ?

Posted by _『Т』『Α』『M』『Α』『Η』『Η』『Å』_ Singh 2 days, 7 hours ago

CBSE > Class 10 > Science

5 answers

Neha Roy 1 day, 20 hours ago

Magnesium ribbon is rubbed before burning because it has a coating of basic magnesium oxide.

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Anagha Pratinidhi 1 day, 21 hours ago

Magnesium oxide... Because before performing the activity of burning the ribbon in air we rub it with sandpaper in order to remove/get rid of the magnesium oxide coating on it.

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Nisha Parmar 1 day, 5 hours ago

calcium carbonate

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Ripan Abc 1 day, 22 hours ago

According to me 2mg+ o2= 2mgo

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Sandhya Kumari 1 day, 5 hours ago

calcium carbonate

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ANSWER

A solution of substance X is used for white washing .Here X is

Posted by Lakshita Mann 2 days, 18 hours ago

CBSE > Class 10 > Science

5 answers

_『Т』『Α』『M』『Α』『Η』『Η』『Å』_ Singh 1 day, 5 hours ago

calcium hydroxide Ca(OH)2

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Rashmika Sutariya😎 😎💞♥️ 🤟❣️💕🙏🙏🙏💙 1 day, 5 hours ago

Thanks

1Thank You

Daksh Batra 2 days, 16 hours ago

Cao

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Gungun Pandey 2 days, 16 hours ago

Slaked lame

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Rajesh Kumar 2 days, 17 hours ago

Slaked lame

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ANSWER

What is the formula for slaked lime

Posted by Shritej Gunda 2 days, 18 hours ago

CBSE > Class 10 > Science

5 answers

Neha Roy 1 day, 21 hours ago

Ca(oH)2

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Anagha Pratinidhi 1 day, 21 hours ago

Ca(OH)2

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Prathi Tharun 2 days, 3 hours ago

Ca(OH)2

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_『Т』『Α』『M』『Α』『Η』『Η』『Å』_ Singh 2 days, 7 hours ago

caoh2

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Daksh Batra 2 days, 16 hours ago

Ca(OH)2

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ANSWER

A student performs an experiment on 'tracing the path of a ray of light passing through a rectangular glass slab "for different values of angle of incidence. He fixes pins P3 and P4, while looking through the face DC, so that their feet are in line with the images of the feet of the pins P1 and P2 :

Posted by Thirumalai Kumar 2 days, 22 hours ago

CBSE > Class 10 > Science

1 answers

Khalid Ansari 2 days, 20 hours ago

Bba

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ANSWER

What is a lens

Posted by Divya Gupta 3 days, 8 hours ago

CBSE > Class 10 > Science

2 answers

Neha Roy 2 days, 20 hours ago

Lens is a transmissive optical device which focuses of disperses a light beam by means of refraction.

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Vansh Mittal 23 hours ago

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Which mirror is used by dentist

Posted by Sudhanva Kulkarni 3 days, 20 hours ago

CBSE > Class 10 > Science

5 answers

Shaik Aashiq 3 days, 5 hours ago

Concave

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Akanksha Tyagi 3 days, 17 hours ago

Concave

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Nirbhay Kumar 3 days, 18 hours ago

Concave

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Komal Yadav 3 days, 19 hours ago

Concave mirror

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Brayan John Jacob 3 days, 19 hours ago

Concave

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A convex mirror has a radius of curvature of 60cm.if a 2.2m tall object is placed 4m in front of mirror.where is the image located and how tall it is

Posted by Priya 4 days ago

CBSE > Class 10 > Science

0 answers

ANSWER

How alveoli helps in exchange of gasses

Posted by Vignesh Gupta 4 days, 21 hours ago

CBSE > Class 10 > Science

4 answers

Sia 🤖 4 days, 21 hours ago

The walls of the alveoli is folded and provide a large surface area for gaseous exchange. It also contains an extensive network of blood vessels which help in easy exchange of gases.

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Ansh Yadav 1 day, 17 hours ago

Alveoli are the sacs which are help in the exchange of gases such as oxygen and carbon dioxide. alveoli has rich/good network of blood capillaries which help in diffusion of both the gases. hope that answers your question.

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Gungun Pandey 2 days, 16 hours ago

The Fall of the Allo wheel is pole and provide a large surface area the copper glass of exchange it also contain and extinguish network of blood vessels which help in easy exchange of gases

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Neha Roy 2 days, 20 hours ago

The alveoli are thin walled and richly supplied with a network of blood capillaries to facilitate the exchange of gases between blood and the air filled in alveoli.

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RI of air wrt glass in 2/3 and water wrt air is 4/3 . Find RI glass wrt water .

Posted by Adyesha Tripathy 5 days, 19 hours ago

CBSE > Class 10 > Science

3 answers

Ansh Yadav 1 day, 17 hours ago

1/2

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Gungun Pandey 2 days, 16 hours ago

1/2

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Aryan Jaisawal 5 days, 9 hours ago

1/2

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ANSWER

Why is magnesium ribbon cleaned before burning in air?

Posted by Saksham Singh 5 days, 23 hours ago

CBSE > Class 10 > Science

5 answers

Madhav Bacharwar 2 hours ago

To remove both carbon and oxygen (but carbon is more appropriate for this question)

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Gungun Pandey 2 days, 16 hours ago

Because magnesium is highly reactive to glases (oxygen) so it from a layer of oxide that need clean

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Komal Yadav 3 days, 19 hours ago

To remove the impurities from it so that it can react with oxygen.

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Chirag Patil 5 days, 15 hours ago

because Magnesium is highly reactive to gases (oxygen) so it forms a layer of oxide that needs clean

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Bhumi Thapliyal 5 days, 18 hours ago

Magnesium is very reactive metal when it is kept in the open air it can react with gases present in the air..... The high reactive nature of magnesium is the reason ribbon should be cleaned Hope u understand the answer.....

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ANSWER

(iii) The two graphs below show the relative activities of two enzymes in solutions of varying pH. Which of the following choices correctly identifies the enzymes? Enzyme activity Enzyme activity 5 5 6 7 8 PH 10 11 2. 12 13 14 12 13 14 Choose the correct combination of enzymes provided in the following table. Enzyme-1 (a) Chymotrypsin (b) Pepsin (c) Lactase 7 8 9 pH 10 11 Enzyme-2 Pepsin Carboxypeptidase Aminopeptidase (d) Enteropeptidase Amylase

Posted by Bhaskar Kumar 6 days, 3 hours ago

CBSE > Class 10 > Science

0 answers

ANSWER

Which of the following can change to anion

Posted by Surayya Banu 1 week ago

CBSE > Class 10 > Science

3 answers

Sujeet Kumar Singh 2 days, 8 hours ago

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Madhu Singh Madhu Singh 6 days, 5 hours ago

Thank you

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Prajapati Vijayshree 6 days, 4 hours ago

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ANSWER

Explain bonding in carbon.

Posted by Pratyush Prakash 1 week ago

CBSE > Class 10 > Science

1 answers

Sushil Kokate 6 days, 7 hours ago

Covalent bonding takes place in carbon it shares it's 4 valence electrons with some other nonmetal to get helium gas configuration.

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All chap

Posted by Shashwat Singh 1 week ago

CBSE > Class 10 > Science

1 answers

Sia 🤖 6 days, 21 hours ago

What do you need ?

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Power of the lens is -40,its focal length is: a. 4m b. -40m c. -0.25m d. -25m ONLY ANSWER IF YOU ARE SURE

Posted by Moksh Yadav 1 week ago

CBSE > Class 10 > Science

5 answers

Ansh Yadav 1 day, 17 hours ago

-0.025 D

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Gungun Pandey 2 days, 16 hours ago

-2.025D

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Komal Yadav 3 days, 19 hours ago

-0. 025 D

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Dhana Lakshmi S 4 days, 2 hours ago

-0.025 D

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[email protected] Wachhami 1 week ago

-2.5m

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Assertion (A): The concave mirror is used to converge the rays of light at a point. Reason (R): The concave mirror is also called as converging mirror. (A)Both A and R are true and R is the correctexplanation of A. (B) Both A and R are true but R is NOT the correct explanation of A. (C) A is true but R is false. (D) A is false and R is True.

Posted by Moksh Yadav 1 week ago

CBSE > Class 10 > Science

5 answers

Madhav Bacharwar 2 hours ago

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Simranjeet Kaur 5 days, 19 hours ago

Option A

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Arohi Raj 5 days, 22 hours ago

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Sumit Kumar 1 week ago

B, is correct option.

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Fulendra Kumar 1 week ago

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Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
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Posted by Virat Kholi 1 week, 1 day ago

CBSE > Class 10 > Science

0 answers

ANSWER

I need right now mind map of metals and non metals

Posted by Prathi Tharun 1 week, 1 day ago

CBSE > Class 10 > Science

1 answers

Blue Heaven Class 10 20 hours ago

Country Maps - Blogger Mind Map Of Metals And Nonmetals Class 10 Go through this

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ANSWER

Explain nephron

Posted by Shreeyanshi Pathak 10F Sn 1 week, 2 days ago

CBSE > Class 10 > Science

1 answers

Anshika Yadav 1 week, 1 day ago

*A kidney is composed of an enormous number of uriniferous tubules. They are also known as nephrons or renal tubules or kidney tubules.Nephrons are the structural and functional units of the kidney.Each kidney is formed of about 1 million nephrons.Nephrons are held together by a connective tissue*. Structure of nephron: Each nephron is made of a glomerulus and a renal tubule. Glomerulus: It is a tuft of anastomosing blood capillaries formed by the fine branches of the afferent arteriole. These capillaries of the glomerulus again unite to form the efferent arteriole.The afferent arteriole is wider than the efferent arteriole.The afferent arteriole brings blood into the glomerulus, while the efferent arteriole collects blood from the glomerulus. Renal Tubule: The renal tubule comprises the following regions: Bowman’s Capsule The Bowman’s capsule lies in the cortex.It is a thin double-walled, cup-like depression.It is the blind end of the nephron.The glomerulus is located in the concave depression of the Bowman’s capsule.The Bowman’s capsule and the glomerulus together are called Malpighian Capsule or Renal Capsule.The outer layer of the Bowman’s capsule is made of flattened epithelial cells.The inner layer is in close contact with the glomerulus and bears special cells called podocytes.Podocytes have many feet-like processes called pedicels and minute slit-like pores called slit pores. Proximal Convoluted Tubule (PCT) PCT lies in the cortex.It is also known as the first convoluted tubule.The Bowman’s capsule continues into the PCT.It is lined with a layer of columnar epithelial cells.The columnar cells are with numerous microvilli to increase the surface area of absorption. Loop of Henle It lies in the medulla.It is U-shaped.It is not convoluted.It has a descending limb and an ascending limb.Each limb has a thick region towards the cortex and a thin region towards the medulla.Thick regions are lined with columnar epithelial cells.Thin regions are lined with flat epithelial cells. Distal Convoluted Tubule (DCT) It lies in the cortex.Its short terminal part is called a collecting tubule.The collecting tubule opens into the collecting duct.DCT in lined with ciliated columnar epithelial cells.The collecting duct receives the contents of many renal tubules.The collecting duct is a larger duct which receives collecting tubules of several nephrons.Collecting ducts pass into the renal medulla and join with each other to form the ducts of Bellini.The ducts of Bellini run through the renal pyramids and open into calyces.All calyces open into the pelvis.From the pelvis, urine is carried to the urinary bladder through the ureters.

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ANSWER

why are solids rigid

Posted by Suman Yadav 1 week, 2 days ago

CBSE > Class 10 > Science

1 answers

Navneet Kumar 1 week, 2 days ago

Because there is less intercellular space between the molecules and high atrraction between the molecules

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ANSWER

activity 1.1 explanation class 10 science

Posted by Keerthana Balaji 1 week, 2 days ago

CBSE > Class 10 > Science

1 answers

Selvaraju Srinidhi 1 week, 2 days ago

This activity is about burning a magnesium ribbon . If you burn a magnesium ribbon you can identify that there will be a white flame produced and a white product (MgO) . This is a activity to explain that a chemical reaction takes place when there is a chance in state , temperature,colour and evolution of gas . Here, the identification property is white dazzling flame . Equation :- 2Mg + O2 = 2MgO Note :- 1) scratch the magnesium ribbon with sand paper before burning because there is a layer of MgO ( magnesium oxide ) over it which prevents further reaction . 2) wear a sunglass before you do this experiment to not affect your eyes while burning .

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