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Ask QuestionPosted by Amit Rustagi 5 years, 11 months ago
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Posted by Abi Sri 5 years, 11 months ago
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Nishtha Sharma 5 years, 11 months ago
Posted by Chinnusamy Kanthasamy 5 years, 11 months ago
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Posted by Shree Chaudhary 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
A Cyclone is a large scale air mass that rotates around strong centers of low pressure.
- Water vapors are formed when water is heated.
- This heat is released to atmosphere when water vapors convert to water during rains.
- The heat released, warms the air around and makes it to move up. This also results in decreased air pressure.
- Hence, cooler air from surrounding rushes to take the warm air’s place.
- This repeats till a low pressure system with surrounding high speed winds is created. This is called a Cyclone.
Posted by Arshi Dhirawani 5 years, 11 months ago
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Nishtha Sharma 5 years, 11 months ago
Samidha Gupta 5 years, 11 months ago
Posted by Priya Oviya 5 years, 11 months ago
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Posted by Nashwa Thasneem 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The excretory system consists of organs which remove metabolic wastes and toxins from the body. In humans, this includes the removal of urea from the bloodstream and other wastes produced by the body. The removal of urea happens in the kidneys, while solid wastes are expelled from the large intestine.
Posted by Nalini Shrivastva 5 years, 11 months ago
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Posted by Hasim Maner 5 years, 11 months ago
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Meghna Thapar 5 years, 6 months ago
Measurement Of Time: Time is a moment or duration in which things occur. The knowledge of time is essential for carrying on our daily life activities. In ancient times people used some natural events which repeated regularly after fixed time intervals to measure time. Like the sun rises everyday in the morning. The time between one sunrise and the next was called a day. Similarly, a month was measured from one new moon to the next. A year was fixed as the time taken by the earth to complete one revolution of the sun. The important time measuring devices used in ancient times were:
- Sundial: The sundial measures time by the position of the shadow cast by the sun.
- Sand clock: This is also called as sand glass or hour glass. The sand clock uses the flow of sand to measure time. The length of time taken by the sand to pass from one bulb of the sand clock to the other gives a constant time interval.
- Water clock: This device uses the rate at which water drips from one vessel to another to measure time intervals. The time taken by the entire water to drip from upper vessel to lower vessel was used for measuring time intervals.
One of the most well-known periodic motions is that of a simple pendulum.
A simple pendulum consists of a small metallic ball or a piece of stone suspended from a rigid stand by a thread. The metallic ball is called the bob of the pendulum is free to swing back and forth.
Galileo discovered the important principle of pendulum. The to and fro motion of a simple pendulum is an example of a periodic or an oscillatory motion. The pendulum is said to have completed one oscillation when its bob, starting from its mean position moves to extreme position and back to mean position. The pendulum also completes one oscillation when its bob moves from one extreme position to the other extreme position and comes back to first extreme position. The time taken by the pendulum to complete one oscillation is called its time period.
Posted by Ghost Soul 5 years, 11 months ago
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Meghna Thapar 5 years, 11 months ago
{tex}FeS (s) + 2HCl (aq) --> FeCl2 (s) + H2S (g){/tex}
Posted by Rajesh Kumar 5 years, 11 months ago
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Posted by Sandeep Adarsh 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Reproduction is essential in living organisms because-
- It helps to maintain the number of individuals of a species.
- It helps in the survival of the species and prevents their extinction.
- It also leads to the evolution of the species in the long run.
Posted by Shambhavi Kapila 5 years, 11 months ago
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Priyanka Ranjan 5 years, 11 months ago
Posted by Nashwa Thasneem 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it. The human heart is divided into four chambers. The upper two chambers are called right and left atrium and the lower two chambers are called the right and left ventricles. Right atrium receives carbon dioxide-rich blood from the body. Blood from right atrium enters the right ventricle, which contracts and pumps the blood to the lungs. On the other hand, oxygen-rich blood from the lungs returns to the left atrium. From the left atrium, blood enters left ventricle. Left ventricle contracts and pumps the blood to all parts of the body. Hence, the rhythmic contraction and expansion of various chambers of the heart maintains the transport of oxygen to all parts of the body.
Posted by Shamsher Singh 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Sheep shearing ia always done after winter because in summer season the day is hot so the sheep can surive without there fur and before winter come there fur comes again.And if there fur is taken out in winter they will die.For that the sheep don't die the sheep keepers take out there fur in winter.And again share its fur in summer season.
Posted by Harsh Kattal 5 years, 11 months ago
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Posted by Amar Singh Meena 5 years, 11 months ago
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Posted by Rajamanoharan Bhuvaneshwari 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Wind
Moving air is called Wind.
- Since air is a mixture of gases, wind is the flow of gases on a large scale.
- Winds are caused by heating difference between different parts of the world and the movement of the earth.
- Winds can be of classified on the basis of:
- Duration: Long and Short
- Strength: High, medium and low
- Speed: Slow and Fast
- High strength winds for longer duration, like cyclone or hurricanes, may cause hazardous effects.
Posted by Ahmed Navin 5 years, 11 months ago
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Pragya Ahuja 5 years, 11 months ago
Posted by Anil Bhati 5 years, 11 months ago
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Nishtha Sharma 5 years, 11 months ago
Srishty Pandey 5 years, 11 months ago
Posted by Ajay Agarwal 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
- Plants too require the phenomenon of respiration for survival.
- They take in oxygen rich air from the atmosphere and breathe out air rich in carbon-dioxide through the tiny pores present in the lower surface of the leaves known as stomata
- Root hairs, lenticels, stomata are some of the parts present in plants for gaseous exchange.
- The roots of plants too respire to generate energy but they follow a different method. They take up air rich in oxygen from air spaces between the soil particles.
- The breathed in oxygen is supplied to the cells where it is used to break down glucose into carbon-dioxide and water.
- By photosynthesis the plants produce glucose but the plants require energy to produce food.
- This glucose is converted into ATP which is the energy currency. Energy is stored in the form of ATP.
- This conversion of glucose to ATP requires respiration in the presence of oxygen.
Posted by Deepika Kharvade 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
|
Appearance |
A concave lens is thinner in the middle and thicker at the edges. |
A convex lens is thicker in the middle and thinner at the edges. |
|
Also known as |
It is also known as Diverging Lens |
It is also known as Converging Lens |
|
Application |
Used in Glasses, some telescopes, spy holes in doors, etc. It is also used for the correction of the problem in short sight |
Used in camera, focus sunlight, overhead projector, projector microscope, simple telescope, magnifying glasses, etc. It is also used for the correction of the problem in long sight. |
|
Focal Length |
Negative Focal Length |
Positive Focal Length |
|
Incident Rays |
It diverges the incident rays away from the principal axis. |
It converges the incident rays towards the principal axis. |
Ayan Khan Khan 5 years, 11 months ago
Posted by Divyanshi Singh 5 years, 11 months ago
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Posted by Aamir Ali 6 years ago
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Naman Ahden 5 years, 11 months ago
Posted by Shivam Gaikwad 6 years ago
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Meghna Thapar 5 years, 10 months ago
Most of the objects reflect light which falls on them. Some objects reflect more light whereas other objects reflect less light. The objects having polished shinning surfaces reflect more light than objects having unpolished dull surfaces. Like shinning silvered mirror reflects back almost all the light which falls on it. The smooth surface of the still water could also act as a mirror. A shining stainless steel plate or a shining steel spoon can change the direction of light.
Take a torch and cover its glass with a chart paper which has three slits. Spread a sheet of chart paper on a smooth wooden board. Fix a plane mirror strip vertically on the chart paper. Now direct the beam of light on the mirror from the torch with slits. Place the torch in such a way that its light is seen along the chart paper on the board. Now adjust its position so that the light from the torch strikes the plane mirror at an angle. The plane mirror reflects the three rays of light falling on it.
Posted by Shenbaga Parumal Revankar 6 years ago
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Any Khan 5 years, 11 months ago
Posted by Aamir Ali 6 years ago
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Priyanka Ranjan 5 years, 11 months ago
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Mahek Parmar 5 years, 11 months ago
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