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Ask QuestionPosted by Aditi Bhatt 5 years, 5 months ago
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Posted by Dhrub Deoli 5 years, 5 months ago
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?Vt Boss ? 5 years, 5 months ago
Posted by Dhrub Deoli 5 years, 5 months ago
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Mohit Mishra 5 years, 5 months ago
Posted by Jesika Patel 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Sonar, short for Sound Navigation and Ranging, is a technique that uses propagation of sound waves to communicate, navigate and detect the objects on or under the surface of the water.
Working of sonar:
- Sonar can send the sound waves towards the depth of the ocean
- When these sound waves hit the objects like fish, vegetation or the bottom of the ocean , they are reflected back to the surface in the form of echo.
- The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up.
- This information enables the device to to measure the depth of the object
- And also it measures the strength of the returning pulse to know the the strength of the objects. The harder the objects, the stronger the return of the sound wave.
Posted by Azim Azad 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Global warming is the phenomenon of gradual increase in temperature near the Earth’s surface. This phenomenon has been observed over the past one or two centuries. This change has disturbed the climatic pattern of the earth. However, the concept of global warming is quite controversial. But, the scientists have provided relevant data in support of the fact that the temperature of the Earth is rising constantly.
Posted by Abhinav Bari 5 years, 5 months ago
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Posted by Ankit Yadav 5 years, 5 months ago
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Posted by Archisha Singhal 5 years, 5 months ago
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Meghna Thapar 5 years, 5 months ago
The organelles that controls the osmotic pressure in a cell are the vacuoles, the cell has to maintain a particular pressure called the turgor pressure to maintain its shape and metabolic activities.
Posted by Srujan Deshpande 5 years, 5 months ago
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Srujan Deshpande 5 years, 5 months ago
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Navjot Kaur 5 years, 5 months ago
Posted by Navjot Kaur 5 years, 5 months ago
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Posted by Navjot Kaur 5 years, 5 months ago
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Meghna Thapar 5 years, 5 months ago
When a Red Blood Cell is placed in concentrated saline solution exosmosis occurs and the RBCs shrink due to excess loss of water.
Posted by Sanskar Singh 5 years, 5 months ago
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Meghna Thapar 5 years, 5 months ago
Most of the plant tissues are supportive which provides them with structural strength. Most of these tissues are dead, since dead cells can provide mechanical strength as easily and need less maintenance. Animals on the other hand, move around in search of food, mates and shelter. They consume more energy as compared to plants. Most of the tissues they contain are living. Another difference between animals and plants is in the pattern of growth. The growth in plants is limited to certain regions, while in animals it is not limited to certain regions. There are some tissues in plants that divide throughout their life. These tissues are localised in certain regions. Based on the dividing capacity of the tissues, various plant tissues can be classified as growing or meristematic tissue and permanent tissue. Cell growth in animals is more uniform.
Posted by Navjot Kaur 5 years, 5 months ago
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Posted by Navjot Kaur 5 years, 5 months ago
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Meghna Thapar 5 years, 5 months ago
Examples of non-membrane bound organelles are ribosomes, the cell wall, and the cytoskeleton.
Posted by Jo Tesh 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Salamander are amphibian
While Lizards are reptilia
1. Reptiles (lizards) are covered in dry scales or scutes,
while Amphibians(salamander) have moist skins.
2.Amphibians(salamander) produce eggs that are dependent for the most part on water and moisture, eggs are soft and moist.
while Reptiles (lizards) have shelled-eggs that are terrestrially adapted.eggsa are hard.
3. Amphibian (salamander) They dont have claws
While Reptiles (lizards) have claws
4. Amphibians (salamander) have life stages like larval stage
While Reptiles (lizards) do not have any larval stage or life stages
Posted by Jo Tesh 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Mass of sodium carbonate = 5.3 g (given)
Mass of ethanoic acid = 6 g (given)
Mass of sodium ethanoate = 8.2 g (given)
Mass of Carbon dioxide = 2.2 g (given)
Mass of water = 0.9 g (given)
Now, total mass before the reaction = (5.3 + 6) g
= 11 . 3 g
And, total mass after the reaction = (8.2 + 2.2 + 0.9 ) g
= 11.3 g
total mass before the reaction = total mass after the reaction.
Hence, the given observations are in agreement with the law of conservation of mass.
Posted by Ronit Chaudhary 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Female Anopheles mosquitoes are the primary hosts and transmission vectors for malaria. Humans and other vertebrates are the secondary hosts.
Posted by Dhrub Deoli 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Prevention of diseases follows three basic principles:
1. Keeping out infectious agents, i.e. maintenance of personal and public hygiene
2. Availability of proper and sufficient food and water for everyone
3. Immunisation
Posted by Urvashi Mishra 5 years, 5 months ago
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Meghna Thapar 5 years, 4 months ago
The weight of an object on the moon will be about one-sixth of what is on the earth. Thus, a spring balance which shows the weight of a body to be 6 N on earth will show a weight of only 1 N when taken to the moon. The weight of an object on the moon is less than that on the earth because the mass and radius of the moon are less than that of earth.
Suppose we have an object of mass m. let its weight on the moon be Wm, the mass of the moon is Mm and its radius is Rm. now, according to the universal law of gravitation, the weight of the object on the moon will be:
Wm = G x Mm x m/Rm2
Let the weight of the same object on the earth be We. The mass of the earth is M and its radius is R.
We = G x M x m/R2
Wm = G x 7.36 x 1022 kg x m / (1.74 x 106 m)2
Wm = 2.431 x 1010 G x m i.
We = 1.474 x 1011 G x m ii.
Dividing both the equations i. & ii.
Wm/We = 1/6
Weight of the object on the moon / Weight of the object on the earth = 1/6
Weight of the object on the moon = (1/6) × its weight on the earth.
Posted by Ujjwal Kumar 5 years, 5 months ago
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Manish Singh 5 years, 5 months ago
Posted by Hari Jha 5 years, 5 months ago
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Anushka Mittal 5 years, 5 months ago
Meghna Thapar 5 years, 5 months ago
To Calculate the Value of g:
To calculate the value of g, we should put the value of universal gravitational constant, G = 6.673 × 10–11 N m2 kg–2; mass of the earth, M = 6 x 1024 kg; and radius of earth R = 6.4 x 106 m in the given equation:
g = GM /r2
g = 6.673 × 10–11 N m2 kg–2 x 6 x 1024 kg/(6.4 x 106 m)2 = 9.8 m/s2
Thus, the value of acceleration due to gravity of the earth, g = 9.8 m s–2.
Posted by Myself Viv 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
relative density = weight in air / weight in air -weight in water
R.D = 80/80-64
R.D = 80/16
R.D = 5
now,
density of water = 1 g/cm³
so the object would sink .
Posted by Ishan Debbarma 5 years, 5 months ago
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Navjot Kaur 5 years, 5 months ago
Namrata Jindal 5 years, 5 months ago
Posted by Shiv Bhatkande 5 years, 5 months ago
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Posted by Navjot Kaur 5 years, 5 months ago
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Seema Chandel 5 years, 5 months ago
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Kavya Tyagi 5 years, 5 months ago
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