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Ask QuestionPosted by Pinky Girl 7 years ago
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Arunitha Mohan 7 years ago
Posted by Montu Maheshwari 7 years ago
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Akshita Wadhwa 7 years ago
Yogita Ingle 7 years ago
Metals are known to be sonorous. That is they produce a sound when they are rung or hit with an object . Non-metal are not sonorous and don’t make a sound on being rung. Non-metals can be transparent .
Posted by Arpit Jamwal 7 years ago
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Meghna Thapar 5 years, 6 months ago
The North Star or Pole Star – aka Polaris – is famous for holding nearly still in our sky while the entire northern sky moves around it. That's because it's located nearly at the north celestial pole, the point around which the entire northern sky turns. Polaris marks the way due north. Pole Star is a star which appears stationary from the Earth. Imagine a straight line passing through these stars . Extend this imaginary line towards the north direction ( nearly five times the distance between the two stars). This line will lead to a star , known as the Pole Star ( North Star ).
Posted by Rahul Suryawanshi 7 years ago
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Pooja K 7 years ago
Posted by Deevyank Garg 7 years ago
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Yogita Ingle 7 years ago
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Hard water |
Soft water |
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It is rich in minerals |
Contains very few elements |
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Soap is not so effective |
Soap is easily effective |
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No foam and lather from soaps |
Bubbly lather from soaps |
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Leaves spots on the washed dishes after they are dried |
Does not leave any spots on dishes after they are dried |
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Contains minerals like magnesium and calcium |
Contains sodium ion |
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Sometimes preferred drinking water |
Sometimes not preferred drinking water |
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Example: Groundwater like deep wells |
Example : Rainwater |
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Hair and skin become dry |
Hair and skin become soft |
Posted by Pavan G 7 years ago
- 1 answers
Yogita Ingle 7 years ago
If the speed of an object is faster than the other object then we can say that an object is moving faster than another .
On a road we can easily spot the difference in speed of different moving object by simply looking at them, if we look at the position of vehicles at one instance of time and then again at the same vehicles after 5 seconds we can spot which vehicle moves the faster and which vehicle moves the slower, the distance moved by an object in a given instance of time will help us decide its speed, like for example in a 100m race, we can say who has the highest speed by looking at who covers 100m in the shortest time, if we have an idea of time and distance we can easily determine the speed.
Posted by Pavan G 7 years ago
- 1 answers
Gaurav Seth 7 years ago
Light emitting diodes.
A light releasing diode is none other than an electric component that would emit light when the current of electricity would be passing through it.
Posted by Pavan G 7 years ago
- 1 answers
Gaurav Seth 7 years ago
Lightning can be explained in terms of charges produced due to rubbing. During a thunderstorm, the air currents move upwards and the water droplets move downwards. And this caused the separation of charge due to this vigorous motion.
As a result of this process, the positive charges collect near the upper edge and the negative charges accumulate near the lower edge of the cloud and also near the ground. As the charge gets accumulated, its magnitude becomes very large. Water droplets in the air act as a conductor of this charge.
These charges flow to meet, thus producing strikes of lightning and thunder. For this phenomenon to occur, a sufficiently high electric potential between two regions and a high resistance medium must be present.
Posted by Pavan G 7 years ago
- 1 answers
Gaurav Seth 7 years ago
When a sweater is taken off, the woollen sweater gets charged because of the friction between the sweater and the body. Hence, one can hear a crackling sound during the given process.
Posted by Javaid Bhat 7 years ago
- 1 answers
Gaurav Seth 7 years ago
Kinetic Energy:
The energy possessed by a body due to its motion is called its kinetic energy.
Formula for kinetic energy:
Kinetic Energy = (½) x mass x velocity x velocity, shortly represented as the following KE = (½) mv2
Examples:
- The energy possessed by a moving road roller
- The energy possessed by a fired bullet from a gun.
- The energy possessed by an arrow released from a bow.
Posted by Javaid Bhat 7 years ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
Cognitive development means how children think, explore and figure things out. It is the development of knowledge, skills, problem solving and dispositions, which help children to think about and understand the world around them. Brain development is part of cognitive development. An example of cognitive development is the neurological development which occurs in the brain. Such development is characterized by the neuroplasticity of the brain, which involves brain repair following injury and the ability of the brain to adapt to new environmental and physiological conditions.
Posted by Rishi Kishore 7 years ago
- 1 answers
Gaurav Seth 7 years ago
The conversion of atmospheric nitrogen into nitrogenous compounds is nitrogen fixation.You have learnt about the bacterium Rhizobium. It is involved in the fixation of nitrogen in leguminous plants (pulses). Recall that Rhizobium lives in the root nodules of leguminous plants, such as beans and peas, with which it has a symbiotic relationship. Sometimes nitrogen gets fixed through the action of lightning. But you know that the amount of nitrogen in the atmosphere remains constant.
Rhizobium bacteria living in the root nodules of legume plants, fix nitrogen from the atmosphere.Microorganisms in the soil convert atmospheric nitrogen into ammonium compounds, thereby enabling the survival of plants and animals.Nitrogen is an essential constituent of proteins, nucleic acids, chlorophyll and vitamins.Blue green algae are able to fix nitrogen from the atmosphere.Nitrogen from the atmosphere is fixed by biological nitrogen fixers like blue green algae and some bacteria.Fungi are decomposers that degrade organic waste compounds into simple substances, ready for reuse by plants
Posted by Md Sameer 7 years ago
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Ayisha Nidha 7 years ago
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Yogita Ingle 7 years ago
It is an instrument used to detect electric charges.A simple electroscope can be constructed as follows.
- Take a glass container.
- Insert a metal wire inside it.
- To the ends of the wire, which are inside the jar, attach 2 metal plates(say aluminium plates).
- The other end is outside the glass container is connected or brought in contact with charged body.
Posted by Somil Uttam 7 years ago
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Yogita Ingle 7 years ago
Electrodes are the metal rods which are dipped in liquids, to which cells are attached are called electrodes. Electrode is a medium of conduction of electricity.
Posted by Montu Maheshwari 7 years ago
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Posted by Amit Kumar Raut 7 years ago
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Neha Gurjar 7 years ago
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Neha Gurjar 7 years ago
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