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Posted by Shubham Saxena ???? 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
When the temperature of the heater becomes greater than the temperature of the surrounding, some of the heat is lost to the surroundings in the form of thermal radiations.
After some time, rate at which heat is being produced becomes equal to the rate of which heat is lost. Hence, the temperature of the element becomes constant.
Posted by Harsh Gangster 5 years, 3 months ago
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Fish's heart is called as 'venous heart' because heart receives blood from veins and send it to the gills for oxygenation. There is only one circulation of blood as the heart is two-chambered. There are veins as well as arteries in the fishes.
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Posted by Harsha Vardhan 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
Birds and mammals are warm-blooded animals and maintain a constant body temperature by cooling themselves when they are in a hotter environment and vice versa. So, for respiration to carry out, more eoxygen is required. So, an efficient system of heart is required to separate the oxygenated and deoxygenated blood to carry out proper functioning of the circulatory system which in turn is linked to respiratory system too. So, the four chambered heart is an efficient design that allows to send "dirty" blood to the the lungs-and "clean" blood to the rest of the body without having to mix the two.
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Gaurav Seth 5 years, 3 months ago
- ur body works within the pH range of 7.0 to 7.8. The pH of saliva ranges from 6.5-7.5.
- When pH of rain water is less than 5.6, it is called acid rain that lowers the pH of the river water and makes it difficult for marine creatures to survive.
- The pH of surface water is 6-8.5 and that of ground water is nearly 6.5-8.5
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Gaurav Seth 5 years, 3 months ago
Fertilization of the egg takes place in the fallopian tube and then it travels to the uterus where the zygote sticks to the walls of the uterus. This embedding of zygote to the wall of the uterus is called as implantation
Posted by Shivani Jha 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
Meaning of the word 'Imperialism' : The word imperialism came from the Latin word 'imperium' and it means to rule over large territories. Definition of Imperialism : It is defined as the policy of extending the rule or authority of an empire or nation over foreign countries, or of acquiring and holding colonies and dependencies.
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Posted by Priya ✧*。٩(๑˙╰╯˙๑)و✧*。 5 years, 3 months ago
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Posted by Tech Killer 5 years, 3 months ago
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Priya ✧*。٩(๑˙╰╯˙๑)و✧*。 5 years, 3 months ago
Posted by Esha Sinha Ray 5 years, 3 months ago
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Meghna Thapar 5 years, 2 months ago
| Metals | Non-metals |
| Metals are electro-positive. | Non-metals are electronegative. |
| Metals reacts with oxygen to form basic oxides. 4Na+O2→2Na2O |
Non-metals react with oxygen to form neutral or acidic oxide.
C+O2→CO2 |
| Metal oxides and hydroxides bonds have ionic bonds. | Non-metal oxides and hydroxides have covalent bonds. |
| Metals react with water to form hydroxide and hydrogen.
2Na+2H2O→2NaOH+H2 |
Non-metals do not react with water. |
| Metals react with dilute acids to form salt and H2. | Non-metals do not react with dilute acid and they can not displace hydrogen. |
| Metals react as reducing agent by donating electrons.
Na→Na++e− |
Non-metals are oxidizing agents that can gain the electrons.
Cl2+e−→Cl− |
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Priya ✧*。٩(๑˙╰╯˙๑)و✧*。 5 years, 3 months ago
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Posted by Priya ✧*。٩(๑˙╰╯˙๑)و✧*。 5 years, 3 months ago
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Posted by Shalvi Rajpura 5 years, 3 months ago
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Posted by Shardul Rai 5 years, 3 months ago
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Gaurav Seth 3 years, 9 months ago
Given : x is a rational number whose decimal expansion terminates . p&q are two integers in which prime Factorisation of q is of the form 2^m5^n where p&q are co-prime & non negative integer
To Find : How x can be expressed
Solution :
• Consider the theorm ,
Let x be a rational number whose decimal expansion terminates.
Then x can be expressed in the form of p/q , where p and q are coprime and the prime factorisation of q is of the form 2^n5^m
, where n, m are non-negative integers.
•According to theorm
X can be expressed in the form of p/q
•Hence , X can be expressed in the form of p/q
Posted by Priya ✧*。٩(๑˙╰╯˙๑)و✧*。 5 years, 3 months ago
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Posted by Arpit Gandhi 5 years, 3 months ago
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Gaurav Seth 5 years, 1 month ago
sin theta=p/h=4/5 so we should find b from this equation
b=✓h²-p²
✓5²-4²
✓25-16
✓9=3
4tan theta - 5 cos theta by sec theta + 4 cot theta
4×p/b - 5×b/h divide by h/b + 4×b/p
4×4/3 - 5×3/5 divide by 5/3 + 4×3/4
16/3-3 by 5/3+ 3
7/3 by 14/3
3_3cancel
7/14=1/2
Posted by Priya ✧*。٩(๑˙╰╯˙๑)و✧*。 5 years, 3 months ago
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Shubham Saxena ???? 5 years, 3 months ago
☆•..¤( Prateek )¤..•☆ 5 years, 3 months ago
Yogita Ingle 5 years, 3 months ago
The photoelectric effect cannot be explained by considering light as a wave. However, this phenomenon can be explained by the particle nature of light, in which light can be visualized as a stream of particles of electromagnetic energy. These ‘particles’ of light are called photons. The energy held by a photon is related to the frequency of the light via Planck’s equation:
E = h? = hc/λ
Where,
- E denotes the energy of the photon
- h is Planck’s constant
- ? denotes the frequency of the light
- c is the speed of light (in a vacuum)
- λ is the wavelength of the light

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Gaurav Seth 5 years, 3 months ago
No, I do not agree with this statement because of the reasons mentioned below:
(a) The tertiary sector or the service sector in India employs many different kinds of people.
(b) This sector has now become the largest producing sector in India by replacing the primary sector. The share of tertiary sector in GDP is now more than 50%.
2Thank You