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Ask QuestionPosted by Garima Ahuja 5 years, 7 months ago
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Dimple Nage 5 years, 7 months ago
Meghna Thapar 5 years, 7 months ago
Those organisms which are too small to be seen without a microscope are called microorganisms. Microorganisms are present in soil, water and air around us. They are classified into four major groups – bacteria, fungi, algae and protozoa.
Posted by Advaitha J 5 years, 7 months ago
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Posted by Usha Devi 5 years, 7 months ago
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Simran Brar 5 years, 7 months ago
Yogita Ingle 5 years, 7 months ago
French Physicist Charles Fabry and Henri Buisson discovered ozone in the year 1913. Ozone layer/ shield is a region present in the stratosphere of the earth’s atmosphere and this region absorbs majority sun’s UV radiation. Mainly found in the lower region of stratosphere almost 20 to 30 kilometres above Earth.
Posted by Shivansh Kumar 5 years, 7 months ago
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Posted by Darth Vader ☠️☠️??☠️☠️?? 5 years, 7 months ago
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Posted by Darth Vader ☠️☠️??☠️☠️?? 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
Unleaded petrol means petrol without lead. The main difference between regular and premium fuel grades is the octane number. Regular fuel has a lower octane number 87, while Premium generally gets a 91 octane rating or higher. “Octane number”, is a measure of the ignition quality of fuel.
Posted by Suraj Sharma 5 years, 7 months ago
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Vansh Raj 5 years, 7 months ago
Posted by Shashi Pandey 5 years, 7 months ago
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Simran Brar 5 years, 7 months ago
Shashi Pandey 5 years, 7 months ago
Posted by Suresh Kukreja Suresh Kukreja 5 years, 7 months ago
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Posted by Saurabh Gupta 5 years, 7 months ago
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Posted by Saurabh Gupta 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Adolescence is that period of life when many changes start taking place in the body; which results in reproductive maturity. It usually begins at around age of 10 years and is seen till 18 or 19 years of age. Adolescents are also called as teenagers as teen age period is also covered up in adolescence.
Posted by Navinya Sukhdeve 5 years, 7 months ago
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Darth Vader ☠️☠️??☠️☠️?? 5 years, 7 months ago
Posted by Vaibhavi Kunjir 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Chlorofluoro carbons (CFCs) are used in refrigerators, air conditioners and aerosol sprays. CFCs damage the ozone layer of the atmosphere which protects us from harmful ultraviolet rays of the sun.
Effects of ozone depletion:
(i) Skin cancer.
(ii) Damage of eyes.
(iii) Damage of immune system.
(iv) Decreased crop yields.
Posted by Vaibhavi Kunjir 5 years, 7 months ago
- 1 answers
Meghna Thapar 5 years, 7 months ago
- Increasing and Reducing Friction:
Friction can be increased by the following methods:
- Grooves are made in the soles of shoes to increase friction and prevent slipping.
- Treads are made in the tyres of vehicles to increase friction and prevent skidding of vehicles on wet roads.
- Spikes are provided in the shoes of players and athletes to increase friction and prevent slipping.
- Gymnasts apply some coarse substance on their hands to increase friction for better grip.
- Machine belts are made of special materials to increase friction and drive machine wheels properly.
Methods of reducing friction:
- Friction can be reduced by making the surfaces smooth by polishing.
- Friction can be reduced by applying lubricants like oil or grease to the rubbing surfaces.
- Friction can be reduced by using wheels to move objects.
- Friction can be reduced by using by using ball bearings between the moving parts of machines.
Posted by Vaibhavi Kunjir 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
A cloud is a visible mass of condensed water vapours floating in the atmosphere, high above the ground. A heavy, dark, rain cloud is called storm cloud. When a storm cloud develops in the sky, strong winds move upwards through the cloud and make the water drops present in the cloud to rub against one another which produces extremely large electric charges in the cloud due to friction. The small water drops acquire a positive charge and being lighter, move to the upper part of the cloud with rising wind. The larger water drops acquire negative charge, and being heavier, come down in the lower part of the cloud. When the magnitude of the accumulated charges becomes very large, the air which is a poor conductor of electricity, is no longer able to resist their flow. Negative and positive charges meet, producing streaks of bright light and sound. We see streaks as lightning. The process is called an electric discharge.Lightning usually occurs within a cloud in the sky called as ‘sheet lightning’. If lightning occurs between a cloud and the earth or tall objects of the earth, it is then called ‘fork lightning’.
Posted by Moorthy.C.N Moorthy.C.N 5 years, 7 months ago
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Simran Brar 5 years, 7 months ago
Dimple Nage 5 years, 7 months ago
Ashi Shakya 5 years, 7 months ago
Posted by Ankit Kainth 5 years, 7 months ago
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Mehak Monga 5 years, 7 months ago
Usha Kumari 5 years, 7 months ago
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Posted by Aashiq Aashiq 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
New Moon- The Moon is positioned between the Sun and the Earth so that the side of the Moon that is viewed from Earth is cannot be seen. Because of this, there appears to be no Moon in the night sky.
Posted by Sumathi Harishankar 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Twins are classified as either dizygotic or monozygotic. Dizygotic twins or fraternal twins arise from two separately fertilized eggs, or zygotes. In humans, usually only one egg is released at a time from a womans ovaries. When two are released, both may become fertilized by separate sperm and implant in the uterus. Dizygotic twins develop separate placentas and amniotic sacs. They may be of the same or different sexes. In the absence of reproductive technology interventions, dizygotic twinning occurs in approximately three of every thousand human births, a rate that increases with maternal age, varies with ethnic group, and is probably influenced by genes that control pituitary function. Various types of assisted reproductive technologies routinely create dizygotic twins, triplets, and higher numbers of offspring.
Monozygotic twins or identical twins arise from a single fertilized egg. At some point after the zygote begins to divide, the cell mass splits into two, creating two embryos from one. Monozygotic twinning occurs in approximately 0.25 percent of human births. Monozygotic twins are always of the same ***. If the cell mass splits before about day five after fertilization, the two embryos will develop with separate placentas and separate amniotic sacs. This occurs in about two-thirds of human monozygotic twins. Between day five and about day nine, splitting leads to two amniotic sacs but one placenta. This occurs in about one-third of Monozygotic twins. Twins that split after day nine will share the amniotic sac. Splitting that late also increases the likelihood that the twins will not separate completely and will develop into conjoined twins.
Posted by Pallav Laddha 5 years, 7 months ago
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Simran Brar 5 years, 7 months ago
Saurabh Gupta 5 years, 7 months ago
Usha Kumari 5 years, 7 months ago
Meghna Thapar 5 years, 7 months ago
Metals are good conductors of heat and electricity. This means they allow heat and electricity to pass through them easily. Copper, gold, iron, silver, aluminium, etc. are all metals which are good conductors of heat that is why we cannot hold a hot utensil without a plastic or a wooden handle.
Posted by Pallav Laddha 5 years, 7 months ago
- 4 answers
Dimple Nage 5 years, 7 months ago
Sakshi Singh 5 years, 7 months ago
Meghna Thapar 5 years, 7 months ago
Metals are good conductors of heat and electricity. This means they allow heat and electricity to pass through them easily. Copper, gold, iron, silver, aluminium, etc. are all metals which are good conductors of heat that is why we cannot hold a hot utensil without a plastic or a wooden handle.
Posted by Seema Singh 5 years, 7 months ago
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Mehak Monga 5 years, 7 months ago
Darshan Bhujbal 5 years, 7 months ago
Posted by Meena Mehta 5 years, 7 months ago
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Shouibhik Singha 5 years, 7 months ago
Yogita Ingle 5 years, 7 months ago
Some persons could be visually handicapped. They could be born with no or poor eyesight, or in some cases, they would have lost their eyesight due to an accident or a disease. But these people, use other sensory organs like touch, hearing, speech to identify, listen, talk and communicate. They could be either Non-optical aids(Hearing Aids, Braille Kit, Audio cassettes/CDs etc) or Optical Aids (Lenses Spectacles, Bifocals). The Braille is the most commonly used by blind to read.
The Braille script is an alphabet set used by the blind for reading and writing. Each Braille character is made up of a combination of 6 dots arranged in a matrix form. A dot may be raised or flat and the blind touch and feel these combinations of raised and flat dots to encode the alphabets.
This system was developed by Louis Braille, a visually handicapped person in 1821.
Posted by Pramod Pimpalkar 5 years, 7 months ago
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Rishi Raj 5 years, 7 months ago
Yogita Ingle 5 years, 7 months ago
- Discharge of untreated sewage and effluents in water bodies should be strictly prohibited.
- Every city should have a sewage treatment plant.
- Public awareness about harms of idol immersion should be increased.
- Traditional crematoriums should be replaced with electric crematoriums.
Posted by Aditi Joshi 5 years, 7 months ago
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Aditya Thakur 5 years, 7 months ago
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