Tag: evs

Questions Related to evs

Sun contains more than __________ of the total mass of the solar system.

evs solar energy water cycle earth's energy budget solar energy and its applications

  1. $90$%

  2. $65$%

  3. $46$%

  4. $99.8$%

Show answer
Correct Option: D

Sun loses approximately a weight of ________ every second which is the amount of ${H} _{2}$ gas that the sun turns into energy.

evs solar energy water cycle earth's energy budget solar energy and its applications

  1. $4$ lakh million tons

  2. $4$ million tons

  3. $4$ lakh tons

  4. $40$ lakh tons

Show answer
Correct Option: B

The correct order of spatial location of different layer of sun are

evs solar energy water cycle earth's energy budget solar energy and its applications

  1. core-radiative zone-convective zone-photosphere-chromosphere-transition region

  2. core-convective zone-chromosphere-photosphere-radiative zone

  3. core-convective zone-photosphere-chromosphere-convective zone-radiative zone

  4. core-radiative zone-convective zone-chromosphere-convective zone-photosphere

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Correct Option: A


Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun's energy?

evs solar energy water cycle earth's energy budget solar energy and its applications

  1. Geothermal energy

  2. Wind Energy

  3. Nuclear energy

  4. BioMass

Show answer
Correct Option: C
Explanation:

Nuclear energy is not ultimately derived from the Sun's energy as uses radioactive substances to produce energy.

The sun radiates electromagnetic energy at the rate of $3.9 \times 10^{26}W$. Its radius is $6.96\times 10^8m$.The intensity of sun light at the solar surface will be $-(in \, W/m^2)$

evs solar energy water cycle earth's energy budget solar energy and its applications

  1. $1.4 \times 10^4$

  2. $2.8 \times 10^5$

  3. $4.2 \times 10^6$

  4. $5.6 \times 10^7$

Show answer
Correct Option: D
Explanation:

$I=\frac { P }{ { 4\pi { R^{ 2 } } } } =\frac { { 3.9\times { { 10 }^{ 26 } } } }{ { 4\times 3.14\times { { \left( { 6.96\times { { 10 }^{ 8 } } } \right)  }^{ 2 } } } } =5.6\times { 10^{ 7 } }w/{ m^{ 2 } }$

Slash and burn agriculture is known as

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Organic farming

  2. Step forming

  3. Crop rotation

  4. Jhum cultivation

Show answer
Correct Option: D
Explanation:
Shifting cultivation, also known as the slash and burn agriculture (Jhum cultivation), is the process of growing crops by first clearing the land of trees and vegetation and burning them thereafter. The burnt soil contains potash which increases the nutrient content of the soil. This burnt land is left for 5-8 years, so as to give the soil the time to regain its fertility .
So, the correct option is 'Jhum cultivation'

Slash and burn agriculture is the other name of

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Step farming

  2. Crop rotation

  3. Organic farming

  4. Jhoom cultivation

Show answer
Correct Option: D
Explanation:

A. Step farming is a piece of sloped plane that as been cut into a series of successively receding flat surfaces or platforms, which resemble steps, for the purposes of more effective farming.It is also called as terrace farming.
B. Crop rotation is the practice of growing a series of dissimilar or different types of crops in the same area in sequenced seasons.
C. Organic farming is a method of crop and livestock production that involves much more than choosing not to use pesticides, fertilizers, genetically modified organisms and growth hormone.
D. Jhoom cultivation, also known as the slash and burn agriculture, is the process of growing crops by first clearing the land of trees and vegetation and burning them thereafter. The burnt soil contains potash which increases the nutrient content of the soil.
So, the correct answer is 'Jhoom cultivation'.

Prolonged water logging in an agricultural fields is likely to create the problems of 

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. poor aeration and low salinity

  2. poor aeration and High salinity

  3. poor aeration and High acidity

  4. Metal toxicity and proper aeration

Show answer
Correct Option: A

Which of the following is not a safe harvesting process followed by farmers?

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Winnowing

  2. Threshing

  3. By using a mechanized harvester

  4. Harvesting on roads

Show answer
Correct Option: D
Explanation:
A.Winnowing is a farming method used for separating grain from chaff.
B.Threshing is the process of loosening the edible part of grain from the husks and straw to which it is attached. 
C.The modern combine harvester, or simply combine, is a versatile machine designed to efficiently harvest a variety of grain crops. 
D.Amongst all these harvesting on the road is dangerous , since it can cause many accidents . '
So the correct option is ' Harvesting on roads ' .

The process that is used to separate grain from stalks etc.is called as 

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Separation

  2. Threshing

  3. Hand picking

  4. Winnowing

Show answer
Correct Option: B
Explanation:

The process that is used to separate grain from stalks etc. is threshing. In this process, the stalks are beaten to free the grain seeds.

So, the correct answer is 'threshing'