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ANSWER

Are all the stars in the sky are actually there??

Posted by Nidhi Girish 5 years, 4 months ago

CBSE > Class 10 > Science

5 answers

Jaat Shab 5 years, 4 months ago

Light is not instantaneous. Sun is 150 million km away from the earth.And the light the sun gives off the photons doesn't reach us immediately.Actually it travels and takes a finite amount of time that is it takes 8 minutes to reach us.If you are looking at the sun than it is 8 minutes past sun.For example if sun went off then we would not understand for another 8 minutes. Now we will come to the point of the start.The closest star to earth after the sun is called Proxima Centauri and it is actually about 4 light years away light years it means light travels at the speed of 3 ×10^8 m/s takes about 4 years to reach us once it leaves the star.So some stars are actually not there.

Nidhi Girish 5 years, 4 months ago

Disha Macwan 5 years, 4 months ago

Are you mad or wht

Luv Mangla 5 years, 4 months ago

Yes. Stars are actually there but we all do not see there actual position, we see there apparent position due to the phenomenon of atmospheric refraction,just like if we put a pencil in water and observe from outside, we see the apparent position of the pencil.

Sanatan Mishra 5 years, 4 months ago

Yes

ANSWER

Posted by Sumaila Ali Choudhary??? 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Sumaila Ali Choudhary??? 5 years, 4 months ago

Sorry vo glti se send ka button press ho gya mera question ye h ki. Question. -: trick to learn atomic mass of all the elements.

ANSWER

What is electrostatic force.

Posted by Sujit Singh 5 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Harchitha Narayanan 5 years, 4 months ago

an attractive and repulsive force between particles are caused due to their electric charges.

Yogita Ingle 5 years, 4 months ago

The electrostatic force is an attractive and repulsive force between particles are caused due to their electric charges. The electric force between stationary charged body is conventionally known as the electrostatic force. It is also referred to as Columb’s force.

Sujal Patil 5 years, 4 months ago

Force lie between

Sujit Singh 5 years, 4 months ago

Force lie between to charges known as electrostatic force.

ANSWER

Can you say what is the actual colour of sky?

Posted by Nidhi Girish 5 years, 4 months ago

CBSE > Class 10 > Science

5 answers

Sanatan Mishra 5 years, 4 months ago

The sky don't have any colour becouse it did not imits light at their own

Nidhi Girish 5 years, 4 months ago

Sumaila Ali Choudhary??? 5 years, 4 months ago

Colour less

Monisha Kani 5 years, 4 months ago

Colour less

Nanda Kishore Reddy .K Nanda Kishore 5 years, 4 months ago

ANSWER

Explain men and women sexual reproductive? In hindi.

Posted by Atul Kumar 5 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Prathamesh Shevale 5 years, 4 months ago

Keep it secret brother??

Atul Kumar 5 years, 4 months ago

Why sir

ANSWER

An electric lamp of 100 Ω, a toaster of resistance 50 Ω and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

Posted by Atul Kumar 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 4 months ago

Resistance of electric lamp (R₁) = 100 Ω
Resistance of toaster (R₂) = 50 Ω
Resistance of water filter (R₃) = 500 Ω

Potential difference of the source (V) = 220 V

The three resistors are connected in parallel as shown in the below figure.

(1) Total resistance (R) can be calculated as shown below.

1/R = 1/R_₁ + 1/R_₂ + 1/R_₃

1/R = 1/100 + 1/50 + 1/500

1/R = ( 5 + 10 + 1 )/500

1/R = 16/500

500/16 = R

Total Resistance (R) = 500/16 Ω

R = 31.25 Ω

(2) According to ohm’s law the current through a conductor between two points is directly proportional to the voltage across the two points.

V ∝ I or V = IR

R is constant called resistance.

R = V/I

500/16 = 220/I

I = 220 × (16/500)

I = 7.04 A

Therefore, the resistance of the electric iron is 31.25 Ω and the current flowing through it is 7.04 A.

ANSWER

What happened if acid will not secreated during digestion of food in stomach

Posted by Vedant Hanath 5 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Adarsh Awasthi 5 years, 4 months ago

If acid is not secreted in stomach during digestion enzyme pepsin will not wark and then protein couldn't be broken into amino acid

Sanatan Mishra 5 years, 4 months ago

You will suffer from constipation, and will need to take multi vetamines

Yogita Ingle 5 years, 4 months ago

Hydrochloric acid is necessary to make the medium acidic which allows inactive enzyme pepsinogen to be converted into pepsin. Pepsin plays an important role in the digestion of proteins. Moreover, it also kills various microbes which may be present in food. These actions would not be possible in the absence of hydrochloric acid.

Account Deleted 5 years, 4 months ago

Hydrochloric acid is necessary to make the medium acidic which allows inactive enzyme pepsinogen to be converted into pepsin. Pepsin plays an important role in the digestion of proteins.

ANSWER

What is the colour of lymph? It is written colourless in ncert book. So is it correct?

Posted by Sunidhi Singh 5 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Monisha Kani 5 years, 4 months ago

Yes it is colour less

Charvi Sangwan 5 years, 4 months ago

On google it's colour is milky yellowish and our teacher also told us that it is of yellowish colour

Meghna Thapar 5 years, 4 months ago

Lymph is a light yellow liquid. It is a medium of circulation in human body which flows only in one direction - from body tissues to the heart. The functions of lymph are:

(i) It takes part in the nutritive process of the body.

(ii) It protects the body by killing the germs drained out of the body tissues with the help of lymphocytes contained in the lymph nodes, by making antibodies.

(iii) It helps in removing the waste products like fragments of dead cells etc.

ANSWER

What is difference between urea and uric acid???

Posted by Sunidhi Singh 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 4 months ago

Urea is produced from the conversion of ammonia. Ammonia comes from the breakdown of amino acids which can be dangerous if too much ammonia is in the body. Uric acid is produced from purines in foods after it has been digested. Urea is made in the liver and excreted in urine. The urea cycle utilizes five intermediate steps, catalyzed by five different enzymes, to convert ammonia to urea. Birds, reptiles, and insects, on the other hand, convert toxic ammonia to uric acid instead of urea.

ANSWER

What kind of nitrogenous waste is given out by birds?

Posted by Sunidhi Singh 5 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Sanatan Mishra 5 years, 4 months ago

Berdegenous nitrogen I think??

Meghna Thapar 5 years, 4 months ago

Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste. Uricothelic organisms tend to excrete uric acid waste in the form of a white paste or powder. Birds therefore get rid of their nitrogen waste by using only enough water to push the paste-like uric acid down the excretory system.

ANSWER

What is placenta? What is the function of placenta?

Posted by Sunidhi Singh 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 4 months ago

Placenta is a disc like special tissue which develops between the uterus wall and the embryo after implantation. Its function is the exchange of nutrients, oxygen and waste products between the embryo and the mother. It contains villi on the embryo’s side of the tissue. On the mother’s side are blood spaces, which surround the villi. This provides a large surface area for glucose and oxygen to pass from the mother to the embryo. The developing embryo will also generate waste substances which can be removed by transferring them into the mother’s blood through the placenta. The time period from the fertilisation up to the birth of a baby is called gestation. The average gestation period in humans is about 9 months (about 38 weeks).The child is born as a result of rhythmic contractions of the muscles in the uterus.

ANSWER

There is a need to dispose the waste in a proper manner. Justify the statement giving reasions.

Posted by Love Preet 5 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Sunidhi Singh 5 years, 4 months ago

Idk

Yogita Ingle 5 years, 4 months ago

It is because waste has to be disposed in such a manner that it doesnt cause any type of pollution.

For example when wastes are dumped into water bodies they pollute it and also affect the marine life.If we bury it in the land it causes the depletion of the fertility of the soil and makes the land a wasteland.

Avatar ? 5 years, 4 months ago

There is a need to dispose the waste materials in such proper manner that it doesn't cause any type of pollution that's harmful for our health.

ANSWER

Do organism create exact copies of themselves in asexual reproduction

Posted by Gonawan1 Nawada Sadar 5 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Royal Patel'S⚔?? 5 years, 4 months ago

Yogita Ingle 5 years, 4 months ago

If organisms reproduce asexually, then there is limited variation, and organisms can create exact copies of themselves.

However, in case of sexual reproduction, there are a lot of variations. Due to this, exact copies of an organism are never created.

Tharshini S.T 5 years, 4 months ago

Because no two biological process provide same results and there will be small variation

Tharshini S.T 5 years, 4 months ago

No the organism won't produce exact copy in both types of reproduction

ANSWER

Example of a double displacement reaction will be:- (a) metal with acid or (b) metal with base or (c) metal with salt.

Posted by Rishi Kishore 5 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Royal Patel'S⚔?? 5 years, 4 months ago

Question is wrong

Tharshini S.T 5 years, 4 months ago

Actually in double displacement reaction only aqueous solutions takes place and their ions exchange themselves and form precipitate. So a),b),c) won't come under double displacement reaction

ANSWER

An electric current of 3A flows through a circuit for 20 minutes. What is the amount of charges flowing?

Posted by Rishi Kishore 5 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Harsh Deep 5 years, 4 months ago

Use the formula I= Q/T. Put the following values and your answer will come. I= Charge T=Time Q=?

Rishi Kishore 5 years, 4 months ago

But they said the answer is 3600C.

Chandresh Tiwari 5 years, 4 months ago

Formula is I=Q/t , 3A=Q/20 min , 3A/20min=Q , 0.15 =Coulomb .ans

ANSWER

Draw and write ray diagrams, image position and image size

Posted by Nischita Nishi 5 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is dissociate or ionise?

Posted by Amayra 1111 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Avatar ? 5 years, 4 months ago

Dissociation in chemistry and biochemistry is a general process in which molecules (or ionic compounds such as salts, or complexes) separate or split into smaller particles such as atoms, ions, or radicals, usually in a reversible manner.

ANSWER

Physics Assignment 1. Derive the motion of charge in a magnetic field if the charge enters the field at 1) 90 degree 2) not at 90 degree 2. Derive the condition for velocity selector

Posted by Khushi Murthy 5 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Name of antioxidants

Posted by Geeta Jadav 5 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Royal Patel'S⚔?? 5 years, 4 months ago

Vitamins C and E, selenium, and carotenoids

Ab Majeed Ganie 5 years, 4 months ago

Vitamins C and E, selenium, and carotenoids such as beta-carotene, lycopene, lutein, and zeaxanthin are examples of antioxidants. This fact sheet offers basic antioxidant statistics, summarizes what research is saying about antioxidants and safety, and recommends sources for further details.

Yogita Ingle 5 years, 4 months ago

ANSWER

Explan sexual

Posted by Atul Kumar 5 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the 1 point

Posted by Disha Jangid 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Ankit Singh Rajput 5 years, 4 months ago

Answer: The relative strength of the magnetic field at a point in the space surrounding the magnetic field is affected by The degree of the closeness and Resistance offered by the field.

ANSWER

Any body answer this question that name the acid and base from which following the salts are formed :mg(cl)2 (Nh2)4 CO3

Posted by Rohit Bera 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Tharshini S.T 5 years, 4 months ago

For 1)mg(cl)2 +H2O =HCL+Mg(OH)2(magnesium hydroxide) 2)(NH4)2CO3=H2CO3(carbonic acid) +NH4OH(ammonium hydroxide)

ANSWER

How are your preparation going for board exam??

Posted by Niharika Raj 5 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Niharika Raj 5 years, 4 months ago

Wow as a lighting

Sachin Patil 5 years, 4 months ago

Nothing only online

Akash Bajantri 5 years, 4 months ago

Tell important points of guide name tell

Vicky Kumar 5 years, 4 months ago

As a lightning ⚡ because I follow the consistency rule

4Thank You

ANSWER

Draw the image of a body in three coordinate axis framed by a plane mirror?

Posted by Rehi Ta 5 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

We all know that in series combination the resistors are connected end to end and in parallel combination the resistors are having two common points. But still I'm having problems in understanding which one is series connection and which one is parallel in series parallel combinations. So can anyone of you help me out of this.

Posted by Aprita Pal 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 5 years, 4 months ago

A circuit is said to be connected in series when the same current flows through all the components in the circuit. In such circuits, the current has only one path. Let us consider the household decorative string lights as an example of a series circuit. This is nothing but a series of multiple tiny bulbs connected in series. If one bulb fuses, all the bulbs in series do not light up. If Vt is the total voltage then it is equal to V1+V2+V3

A circuit is said to be parallel when the electric current has multiple paths to flow through. The components that are a part of the parallel circuits will have a constant voltage across all ends. If Vt is the total voltage then it is equal to V1=V2=V3

ANSWER

Why is calcium sulphate hemihydrate called ' Plaster of Paris' ?

Posted by Swadha Sinha 5 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Tharshini S.T 5 years, 4 months ago

Because it was found near the area of Paris .so it is called as plaster of Paris

Shreya Panwar 5 years, 4 months ago

Because its chemical formula is CaSo^4+1/2H^2O +1*1/2H^2O

Aprita Pal 5 years, 4 months ago

The chemical name of plaster of Paris is calcium sulphate hemihydrate.

Yogesh Vashisth 5 years, 4 months ago

Because it's formual CaSo4+1/2H2o+1*1/2h2o

ANSWER

What do all acids and all bases have in common

Posted by Richa Singh 5 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Learner Kumar 5 years, 4 months ago

All acids have H ions and base have OH ions

Amayra 1111 5 years, 4 months ago

All acids have H + ions where aa all base haveOH- ions.

Satyam Lodhi Rajput 5 years, 4 months ago

Hydrogen gas

Tejasvi Jamwal 5 years, 4 months ago

Both acids and bases dissolve fully/partially in water to form electrolytes (i.e. conduct electricity) Both of them react with oxygen to form respective oxides. There are exceptions. Both of them react with water to form respective oxides or hydroxides. There are exceptions.