Science
Ingestion-and-Digestion-1
Easy
Question
For a spherically symmetrical charge distribution, electric field at a distance r from the centre of sphere is 
where k is a constant. What will be the volume charge density at a distance r from the centre of sphere ?
The correct answer is:
By using Gauss law 
(Note : Check dimensionally that r µ r6 )
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Two positrons (e+) and two protons (P) are kept on four corners of a square of side a as shown in figure. The mass of proton is much larger than the mass of positron. Let q denotes the charge on the proton as well as the positron then the kinetic energies of one of the positrons and one of the protons respectively after a very long time will be
Two positrons (e+) and two protons (P) are kept on four corners of a square of side a as shown in figure. The mass of proton is much larger than the mass of positron. Let q denotes the charge on the proton as well as the positron then the kinetic energies of one of the positrons and one of the protons respectively after a very long time will be
scienceingestion-and-digestion-1
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The air above the ocean and lakes is dry.
The air above the ocean and lakes is dry.
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The amount of water vapor in the air is calculated as humidity.
The amount of water vapor in the air is calculated as humidity.
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The amount of rainfall is measured by using a hygrometer.
The amount of rainfall is measured by using a hygrometer.
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The humidity in deserts is typically very low.
The humidity in deserts is typically very low.
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It is not easy to walk against the wind on a windy day.
It is not easy to walk against the wind on a windy day.
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Jasmine carried out an experiment. She placed two bowls of sand and water in the sunlight. She took the temperatures after an hour. She then took both the bowls into her home and placed them in an area with no light. She took another temperature after an hour and conducted the following observations:
| Sand |
Water |
|
| Before placing the bowls in the sunlight |
370C |
300C |
| After keeping the bowls in the sunlight for one hour |
370C |
320C |
| After keeping the bowl inside the house for one hour |
310C |
310C |
Jasmine carried out an experiment. She placed two bowls of sand and water in the sunlight. She took the temperatures after an hour. She then took both the bowls into her home and placed them in an area with no light. She took another temperature after an hour and conducted the following observations:
| Sand |
Water |
|
| Before placing the bowls in the sunlight |
370C |
300C |
| After keeping the bowls in the sunlight for one hour |
370C |
320C |
| After keeping the bowl inside the house for one hour |
310C |
310C |
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Match the following.
| A. Barometer |
1.  |
| B. Rain gauge |
2.  |
| C. Wind vane |
3.  |
Match the following.
| A. Barometer |
1. |
| B. Rain gauge |
2. |
| C. Wind vane |
3. |
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Hygrometer is used to measure the air pressure.
Hygrometer is used to measure the air pressure.
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Read the statement given by John and Alan. Who is correct?
Read the statement given by John and Alan. Who is correct?
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Direction: Read the statements and select the correct option.
Statement A: Season refers to when a particular type of weather persists over a large area for an extended period of time.
Statement B: Rain is defined as moving air.
Direction: Read the statements and select the correct option.
Statement A: Season refers to when a particular type of weather persists over a large area for an extended period of time.
Statement B: Rain is defined as moving air.
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The amount of water vapor is very high in _______.
The amount of water vapor is very high in _______.
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In which of the following image will the humidity be more?
In which of the following image will the humidity be more?
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The change in conditions of a place on a day-to-day basis is called a season.
The change in conditions of a place on a day-to-day basis is called a season.
scienceGrade-4-
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Which of the following instrument is used to measure the humidity?
A B
Which of the following instrument is used to measure the humidity?
A B
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