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Ask QuestionPosted by Shruti ? 3 years, 11 months ago
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Preyasi Jain 3 years, 11 months ago
Posted by Keval Chorada 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
For a moving solid body, there are two principal types of friction that act upon it:
- The force resisting the motion of a rolling body on a surface is known as rolling friction or rolling resistance. Rolling of ball or wheel on the ground is an example of Rolling friction.
- The other type of friction is sliding friction. In this type of friction, there is a restriction on the body’s movement as only one side of the body is in contact with the surface. Pushing a box across the table is an example of Sliding friction.
Posted by Shruti ? 3 years, 11 months ago
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Diksha Laniya🐥 3 years, 11 months ago
Posted by Ayush Sharma 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
RNA is a ribonucleic acid that helps in the synthesis of proteins in our body. This nucleic acid is responsible for the production of new cells in the human body. It is usually obtained from the DNA molecule.
Diksha Laniya🐥 3 years, 11 months ago
Posted by Diksha Laniya🐥 3 years, 11 months ago
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Posted by Sameer Kumar Chhimpa 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
Menstruation is the process of the shedding of the uterine lining on a regular monthly basis. It begins at puberty and is the reproductive cycle of the female body. Every month, the uterus prepares itself to receive a fertilised egg. Therefore, the inner lining of the uterus becomes thick and is supplied with blood to nourish the embryo. If the egg is not fertilised, then the lining of the uterus breaks down and gets Released in the form of blood through the ******. This lasts for about two to eight days. This cycle occurs every month and is known as the menstrual cycle.
Posted by Priya Kumari 3 years, 11 months ago
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Diksha Laniya🐥 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Time period is defined as the time required to complete one oscillation.
Frequency is defined as the number of oscillations per unit time.
Time = 4 sec. Time Period = (4/40) = 0.1 sec
Posted by Name Surname 3 years, 11 months ago
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Posted by Name Surname 3 years, 11 months ago
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Ankit Singh 3 years, 11 months ago
Diksha Laniya🐥 3 years, 11 months ago
Posted by Diksha Laniya🐥 3 years, 11 months ago
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Shruti ? 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
This is because tadpoles require water to survive.
- Frogs breathe through their moist skin or by lungs.
- However tadpoles breathe through their gills since they grow well in the the habitat which is filled with water.
- The rainy season is a season when the frogs breathe.
- The Frog lay their eggs which has to form tadpoles.
- The tadpoles require water to survive.
- As a result frogs move towards the pond during rainy season.
Posted by Diksha Laniya🐥 3 years, 11 months ago
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Nandkishor Pardeshi 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
A zygote is a fertilized ovum. The germ cells undergo meiosis to reach a haploid state (n) as part of spermatogenesis and oogenesis. The sperm and the unfertilized ovum reinstates a chromosome set in zygote in a diploid state (2n).
Posted by Ayush Sharma 3 years, 11 months ago
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Diksha Laniya🐥 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
Microscope is an instrument which has good resolving power and magnification. It is used for studying very small sized objects like cells. The very first microscope was built by Zacharias Janssen in 1590. It was first modified by Galileo and then by Robert Hooke.
Posted by Priyanka Longesha 3 years, 11 months ago
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Posted by Diksha Laniya🐥 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
Hydra reproduces by the method of budding. A small outgrowth called bud is formed on one side of its body by repetitive mitotic division. This bud gradually grows into a full hydra, developing its mouth and tentacles. The new Hydra detaches itself from its parent and start living as a separate organism.
Posted by Diksha Laniya🐥 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
The process of fusion of a sperm with an ovum is called fertilisation.
Posted by Diksha Laniya🐥 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
The development of fertilised egg takes place in the uterus (womb)
Posted by Diksha Laniya🐥 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
The testes produce sperms continuously from the stage of puberty onwards. Sperms from the testis pass through the sperm duct, known as vas deferens.
Posted by Diksha Laniya🐥 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses. It may be applied to the affected area to treat psoriasis and seborrheic dermatitis (dandruff).
Harsh Dev Jha 3 years, 11 months ago
Coal tar is made up by mixing the compounds of coke and coal gas. It is mostly used as a raw material in road formation.It also has a great contribution in medicinal use.
Posted by Niyati Mangela 3 years, 11 months ago
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Diksha Laniya🐥 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Friction is a force that resists the relative motion between two objects or materials. The causes of the resistive force of friction are:
- Molecular Adhesion
- Surface Roughness
- Plowing effect
Gaurav Seth 3 years, 11 months ago
When we try to move one object over another object, the irregularities present on their surface get entangled or locked with one another. The interlocking of irregularities of the two surfaces opposes the motion of one object over the other and give rise to force of friction.
Friction is caused by the interlocking of irregularities in the surface of two objects which are in contact with each other. To move one object over the other ,we have to apply a force to overcome interlocking of the irregularities in their surfaces.
More the roughness of a surface larger is the number of irregularities on its surface and has greater will be the friction does the force of friction.The force friction is greater if very rough surfaces are involved.
Posted by Shreya Pathak 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
Drip system
There is network of narrow pipes with small holes in the fields.When water flows through the narrow pipes,it fall drop by drop at the position of roots of the plants.This water is absorbed by the soil in the root zone of the plants and utilised by the plant.There is no wastage of irrigation of water.
Advantages
1)It provides water to plants drop by drop.So water is not wasted at all.
2) It minimises the use of water in agriculture.It is useful in those regions where the availability of water is poor.
Posted by Gaurav Dhakar 3 years, 11 months ago
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Posted by Aastha Kumari Kumari 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
- The moon changes its shape everyday over a period one month and this repeats over and over again. These different shapes of the moon are called 'Phases of the Moon'. In reality, the moon does not change its shape at all. Moon is always round in shape. As we know the moon is always visible because it reflects the light from the sun.
- It goes from a perfect round circle and gradually reduces in size and further becomes a no moon (as shown here). This takes about 15 days. This is called waxing.
- Then the moon again begins to grow in size until it becomes a full moon. This takes another 15 days. This is called waning.
- The total span between 2 full moons is approximately 30 days nearly a month.
- At any point of time, the sun is able to illuminate only half part of the moon. The other half of the moon does not receive any portion of sunlight because of its spherical shape.
- Depending on the these positions of sun, moon, and the earth, different proportions of the illuminated moon faces the earth, causing the shape of the moon appearing to change as seen from earth.
- On a full moon day, when the moon appears as a bright complete circle, the earth is directly between the moon and the sun. The illuminated surface of the moon fully faces the earth, making the moon appear round.
- On a new moon phase, the moon is between the Sun and Earth. This means its light is not reflected to Earth. Instead, the light from the sun bounces back from the earth and causes a slight illumination on the moon.
- All shapes or the phases of the moon indicate its position from the Sun and earth and how light behaves in relation to each.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
| Asteroid | Comet |
| Asteroids have an elliptical orbit | Comets have an eccentric orbit. |
| It is made of metals and rocks | Made of rocks, hydrocarbons, and ice |
| Do not produce a coma or tail atmosphere | Thin, temporary atmospheric tail when close to the Sun. |
| The orbital period is 1 to 100 years | The orbital periods are 75 to more than 100,000 years. |
| 1 to larger than 100 kilometers in size | 1 to 10 kilometer in size (nucleus only) |
Posted by Aastha Kumari Kumari 3 years, 11 months ago
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Harsh Verma 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Mars (Mangal): It is the first outside the orbit of the earth. It is also known as red planet. It has two satellites.
Jupiter (Brihaspati): It is the largest planet of the solar system. It has a large number of satellites (moons).
Saturn (Shani): It appears yellowish in colour. It has beautiful rings. Saturn has a large number of satellites. It is least dense among all the planets.
Uranus (Indra): Like Venus, Uranus also rotates from east to west. It has highly tilted rotational axis. So in its orbital motion Uranus appears to roll on its side.
Neptune (Varun): It is the outermost planet of the solar system. It has two moons.
Mercury (Budh): It is the smallest planet and nearest to the sun. Mercury has no satellite of its own.
Venus (Shukra): It is nearest to the earth and is the brightest planet in the night sky. Venus has no moon or satellite of its own. It rotates from east to west while the earth rotates from west to east.
Gaurav Seth 3 years, 11 months ago
The characteristics of eight planets are:
1)Venus : Its surface is a brownish yellow colour because of its atmosphere which is composed of largely of sulphuric acid and CO2.
2)Mars: It takes 687 days to revolve around the sun.This planet is very hottest planet then other planets.
3)Uranus: It rotates the sun in 84 years, its size is 51,118 kilometers in diameter.
4)Neptune: It's size is 49,500 kilometres in diameter. It orbit the sun every 165 years.
5)Mercury:It is the closest planet to the sun,so its orbits the sun very quickly just in 88 days.It surface is grey to orange in colour and it is covered with craters.
6)Earth: Earth rotates the sun every 365 days(years) and rotates in its every axis in 24 hours(day). It size is a little more than 12000 km. In diameter. This planet is the different from the other planets as it maintains life on it.
7)Jupiter:It is the largest of the solar system as a diameter of 142,980.
8)Saturn:It is a large planet as 120,536.It's orbit the sun in 12 years.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
Orbital period
The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets
rotation period
The rotation period of a celestial object (e.g., star, gas giant, planet, moon, asteroid) is the time that the object takes to complete a single revolution around its axis of rotation relative to the background stars.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
Since the planets are much nearer to us than the stars, they appear to be big and do not twinkle at night. The stars appear to twinkle at night but the planets do not twinkle at all. The planets move around the Sun from west to east, so the relative positions of the planets in the night sky keep changing day by day.
Posted by Lokesh Patil 3 years, 11 months ago
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Shruti ? 3 years, 11 months ago
Jagat Baghel 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
| Force |
| The push and pull action resulting in acceleration of the object |
| Its unit is Newton and is represented by N |
| The instrument to measure force is called a dynamometer |
| Force is a vector quantity which means it also has direction |
| Force can be acted upon on the face, edges, side or vertices of the object |
| The velocity of an object can be changed with the application of force in one direction |
| Pressure |
| Force acting upon a certain area and acted upon something perpendicular to its surface |
| Its unit is Pascal and is represented as Pa |
| Instrument to measure pressure is called as a manometer |
| The pressure is a scalar quantity which means it does not have direction |
| Pressure only acts on the surface or face of the object |
| Pressure on the object won’t change the direction of the object. |
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Shruti ? 3 years, 11 months ago
1Thank You