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Ask QuestionPosted by Aishwarya Ananya Singh 7 years ago
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Posted by Alka Sharma 7 years ago
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Gaurav Seth 7 years ago
Adolescence is the period of life, when the body undergoes changes, leading to reproductive maturity. It begins around the age of 11 and lasts upto 18 or 19 years of age. In girls adolescence may begin one or two year earlier than boys.
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Aryan Raj 7 years ago
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Aryan Raj 7 years ago
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Yogita Ingle 7 years ago
Some of the main physical properties of metals are
- The have lustreand a metallic appearance.
- They are usually in the form of a solid at room temperature.
- They are very good conductors of electricity and heat.
- Metals are malleable and ductile.
- They mostly have a very high melting point.
Posted by Subham Mishra 7 years ago
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Posted by Lingarajgouda S B Basanagoudar 7 years ago
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Meghna Thapar 6 years, 1 month ago
Menarche is the first menstrual cycle, or first menstrual bleeding, in female humans.
Posted by Spoorthi K S 7 years ago
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Meghna Thapar 6 years, 1 month ago
- Middle zone: The middle zone of a flame is yellow. It is bright and luminous. In it the fuel vapours burn partially because there is not enough air so it produces carbon particles which become white hot and emit light. This zone is the major part of a candle flame.
Posted by Rajwardhan Thakur 7 years ago
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Spoorthi K S 7 years ago
Posted by Spoorthi K S 7 years ago
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Gaurav Seth 7 years ago
- Puberty is the stage during which the immature reproductive system in boys and girls matures and becomes capable of reproduction. It is related to the physical changes.
- Adolescence is period of mental and emotional changes which boys and girls experience while gaining sexual maturity.
Posted by Spoorthi K S 7 years ago
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Aditi Sota 7 years ago
Posted by Spoorthi K S 7 years ago
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Mehul Chahar 7 years ago
Gaurav Seth 7 years ago
WINNOWING:-
1) the process of separating dust particles with the help of wind is called winnowing.
2) mixture of grain and husk are allowed to fall from a height.
3) heavier grain falls on the ground, whereas lighter grains are carried away by the wind.
THRESHING:-
1) process of removing chaff from the grains is called threshing.
2) it is done using a stick.
Posted by Dipcharan Das 7 years ago
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V Siva 7 years ago
Posted by V Siva 7 years ago
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Gaurav Seth 7 years ago
Characteristics of sound
There are different characteristics of sound which are as follows:
- Loudness
- Pitch
- Quality
- Intensity
Loudness
It is a characteristic of sound, the degree of sensation of sound. It depends upon amplitude. Amplitude determines the loudness of sound. Loudness is proportional to the square of the amplitude of the vibrating body which produces sound. More is the amplitude, louder is the sound. It is measured in unit ‘decibel’.
The more the amplitude of vibration, louder the sound. The lesser the amplitude of vibration, the sound gets feeble.
Pitch
It is the property that determines the shrillness (sharpness) or depth of sound. It depends upon the frequency. More the frequency, more the voice is shrilled. Less the frequency, deep is the sound. For example: a baby’s voice has more frequency and thereby, it is shriller than an adult’s voice.
Quality
It is the property by which one can distinguish between two different sounds of same pitch and loudness. Like in a dark room where there is no light and 100 people are present, we can easily recognize the sound of our friend among all the people due to the particular quality of its sound.
Intensity
It is defined as the number of sound waves passing 1 meter square area in one second. It depends upon the square of amplitude.
Sound can travel through all 3 states of matter that is solids, liquids and gases.
Speed of sound depends upon the density (density is defined as mass per unit volume) of medium (it increases with increase in density of mediums).
Speed of sound is maximum in solids and least in gases as particles are closer in solids. So, transfer of sound energy occurs faster. Speed of sound in air is 340 metre per second.
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Meghna Thapar 6 years, 1 month ago
The increase in the percentage of the gases which prevent the escape of heat from the earth, which cause the average temperatures to increase worldwide is called greenhouse effect.
Heat is trapped by glass, and hence the temperature inside a glass enclosure will be much higher than the surroundings. This phenomenon was used to create an enclosure where tropical plants could be kept warm during the winters in colder climates. Such enclosures are called greenhouses. Carbon dioxide is one of the greenhouse gases.
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Yogita Ingle 7 years ago
Paddy is a kharif crop which is sown in rainy season. It requires lots of water for its growth. During winter large amount of water is not available. Hence due to unavailability of sufficient water and unfavourable climatic conditions paddy should not be grown in the winter season.
Rainy season is the preferred season for paddy cultivation.
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