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Ask QuestionPosted by Ahamed Ismail 5 years, 3 months ago
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Posted by Tripura * 5 years, 3 months ago
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Meghna Thapar 5 years, 3 months ago
The Acid Rain Program (ARP), established under Title IV of the 1990 Clean Air Act (CAA) Amendments requires major emission reductions of sulfur dioxide (SO2) and nitrogen oxides (NOx), the primary precursors of acid rain, from the power sector. The Acid Rain Program (ARP), established under Title IV of the 1990 Clean Air Act (CAA) Amendments requires major emission reductions of sulfur dioxide (SO2) and nitrogen oxides (NOx), the primary precursors of acid rain, from the power sector.
Posted by Tripura * 5 years, 3 months ago
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Meghna Thapar 5 years, 3 months ago
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. Sulfuric acid ( H2SO4 ), nitric acid ( HNO3 ), and carbonic acid ( H2CO3 ) are the major components of acid rain.
Posted by Tripura * 5 years, 3 months ago
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Posted by Tripura * 5 years, 3 months ago
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Meghna Thapar 5 years, 3 months ago
Natural disasters are caused due to different reasons like soil erosion, seismic activity, tectonic movements, air pressure, and ocean currents etc. Natural disasters are the unreceptive events resulting from different natural processes. These natural events triggered by natural hazards cause destruction of life and property as well. Some well-known examples of these disasters are floods, earthquakes, tsunami, wildfires, droughts, thunderstorms and hurricanes etc.
Posted by Account Deleted 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Regeneration happens through mitosis and a particular type of tissue can give rise to its own kind only. In complex organisms, different tissues and organs have altogether different structures. Regenerating a different kind of tissue from another kind is not possible. Hence, complex organisms are unable to give rise to new individuals through regeneration.
Posted by Shyama Pandey 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
An electric motor is a device which converts electrical energy into mechanical energy. The principle behind the electric motor is based on Fleming’s left hand rule.
Working: When a current is allowed to flow through the coil PQRS the coil starts rotating anti-clockwise. This happens because a downward force acts on length PQ and at the same time, an upward force acts on length RS. As a result, the coil rotates anti-clockwise.
Current in the length PQ flows from P to Q and the magnetic field acts from left to right, normal to length PQ. Therefore, according to Fleming’s left hand rule, a downward force acts on the length PQ. Similarly at an upward force acts on the length RS. These two forces cause the coil to rotate anti-clockwise.
When coil complete half rotation, the position of PQ and RS interchange. The half-ring D comes in contact with brush A and half-ring C comes in contact with brush B. therefore the direction of current in the coil PQRS gets reversed. Now the current flows through the coil in the direction SRQP.
The direction of current through the coil PQRS reverse after every half rotation. As a result, the coil rotates in same direction. The split rings help to reverse the direction of current in the circuit. These are called the commutator.
Posted by Asmita Belapurkar 5 years, 3 months ago
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Meghna Thapar 5 years, 3 months ago
Most revolutionaries saw the creation of nation states as a necesary part of their freedom struggle because only a nation state could exert political authority. Unless independent political authority was exerted, the revolutionaries could not have formed a government on their own. Revolutionary ideas were spread by opposing monarchical forms and to fight for liberty and freedom. Most of the revolutionaries also saw the creation of nation-states as a necessary part of this struggle for freedom.
Posted by Pankaj Juad 5 years, 3 months ago
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Ajin Ajin 5 years, 3 months ago
Prashant Arya 5 years, 3 months ago
Posted by Krishna Kumawat 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Convex Mirror: Spherical mirror with reflecting surface curved outwards is called convex mirror.
Concave Mirror: Spherical mirror with reflecting surface curved inwards is called concave mirror.
Posted by Bhakti J. Neve 5 years, 3 months ago
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Krishna Kumawat 5 years, 3 months ago
Posted by Amisha Mourya 5 years, 3 months ago
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Posted by Suraj Dada 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
A chemical reaction is in which the bonds are broken within reactant molecules, and new bonds are formed within product molecules in order to form a new substance.
Posted by Yash Kaushik 5 years, 3 months ago
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Rohit Pmak 5 years, 3 months ago
Posted by Karthick Kathir 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
2 g of ferrous sulphate crystals are heated in a boiling tube then we observe that :
Ferrous sulphate crystals contains 2 water moelcules.
On heating it looses water molecules and becomes anhydrous ferrous sulphate .
Colour changes from light green to white . Ferrous sulphate crystals which are in green colour decomposes to give Ferric oxide , sulphur dioxide and sulphur trioxide gas.
On further heating FeSO4 anhydrous changes to dark brown solid ..
The gas emitted has the characteristics smell of sulphur.
Chemical reaction :.
2FeSO4 (S) -------------->Fe2O3 (S) +SO2(g) +SO3 (g)
Anhydrous Ferric oxide
Ferrous sulphate
Posted by Rahul Kumar 5 years, 3 months ago
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Abhishek Singh Gurjar X-B Roll No.-02 5 years, 3 months ago
Charu Kandari 5 years, 3 months ago
Posted by Anshul Jain 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
The two examples are
1.) The twinkling star
2.) The sun is seen a little before it rises and for a short while after sets.
Posted by Prakashbhaidabhi Prakashbhaidabhi 5 years, 3 months ago
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Posted by Srikar Gunna 5 years, 3 months ago
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Nur Sahin Choudhury 5 years, 3 months ago
Bhumika Kanel 5 years, 3 months ago
Posted by Suresh Bhai 5 years, 3 months ago
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Nur Sahin Choudhury 5 years, 3 months ago
Posted by Suresh Bhai 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
The heart is roughly cone shaped hollow organ. It is approximately the size of owner’s closed fist and weighs about 250-300 gm in female and 300-350gm in the male. The heart lies in the thoracic cavity in the space between the lungs (mediastinum) anterior to the vertebral column and posterior to the sternum. The heart consists of 4 chambers. At first, the heart is divided into the right and left side by the septum. Each side is further divided into 2 chambers each by the atrioventricular valve. The upper two chambers are called atrium and lower two are called ventricles. Atrium are thin-walled chamber separated by an interauricular septum The right atrium receives impure blood from the body through the opening via superior and inferior vena cava. Ventricles are a thick-walled chamber. separated by the thick inter-ventricular septum.
Posted by Suresh Bhai 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
Kidneys: They are a pair of bean-shaped, reddish brown organs that help in maintaining the water and salt concentration of blood by the process of osmoregulation.
Ureters: They carry urine from each kidney to the urinary bladder.
Urinary bladder: They store urine until it is expelled from the body.
Urethra: It is a short tube through which urine is passed out.
Yogita Ingle 5 years, 3 months ago
(a) In humans, the excretory system consists of a pair of kidneys, a pair of ureters, urinary bladder and urethra.
(b) Kidneys are two bean shaped organs lying at the back of the abdomen, one on either side of the vertebral column. Waste products from the blood and urine are removed by the kidney.
(c) A Nephron is the basic filtration unit of the kidney. It is a cluster of thin walled blood capillaries.
(d) The urine produced by filtering the blood is transported to the urinary bladder. This is done by a pair of ureters. Ureters are long muscular tubes.
(e) Urinary bladder is a muscular bag like structure which can hold urine. The urinary bladder is under the control of nerves. When the bladder is full one get urge to urinate.
(f) This urine is thrown out of the body through urethra.
(g) Apart from the kidney, the skin and lungs are also helpful in the excretion.
Posted by Tanushree Das 5 years, 3 months ago
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Nur Sahin Choudhury 5 years, 3 months ago
Bhumika Kanel 5 years, 3 months ago
Gaurav Seth 5 years, 3 months ago
Laws of refraction;-
- The incident ray,the refracted ray and the normal to the refracting surface at the point of incidence lie in the same plane.
- For a given pair of media and for a given colour of light the ration between the sine of angle of incidence to the sine of refraction is a constant.This constant is known as refractive index of the second medium with respect to the first medium.
When a ray of light passes through a glass slab, ∠i,∠r and the normal all lie in the same plane.
When a ray of light passes from one medium to another, here from air to glass or glass to air, the ratio sini/sinr =constant.
Posted by Zainab Chaudhary 5 years, 3 months ago
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Posted by Charvi Sangwan 5 years, 3 months ago
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Ajin Ajin 5 years, 3 months ago
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Saurabh ???? 5 years, 3 months ago
Life Is Full Of Struggle 5 years, 3 months ago
Posted by Radhika Shukla 5 years, 3 months ago
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Mugdhaa Sarode 5 years, 3 months ago
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Hariom Upadhyay 5 years, 3 months ago
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