Tag: evs - i

Questions Related to evs - i

Long range transmission of TV-signal is done by

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. space wave

  2. sky wave

  3. ground wave

  4. artificial satellite

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Correct Option: D
Explanation:

TV-signal ( $30: MHz$ - $300:MHz$) are not reflected by ionosphere. Therefore, sky-wave propagation is not possible and similarly ground and space wave is also not feasible. Hence, they are transmitted to artificial satellite from where they are transmitted back to the Earth.

What fraction of the surface area of earth can be covered to establish communication by one geostationary satellite?

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. $\displaystyle\frac{1}{2}$

  2. $\displaystyle\frac{1}{3}$

  3. $\displaystyle\frac{1}{4}$

  4. $\displaystyle\frac{1}{8}$

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Correct Option: B
Explanation:

We uses three geostationary satellites placed at the vertices of an equilateral triangle, then the entire earth can be covered by the communication network, each satellite covers $1/3$ of the globe.

A ground receiver station is receiving a signal at (a) 5 MHz and (b) 100MHz, transmitted from a ground transmitter at a height of 400m located at a distance of 125km. Identify whether it is coming via space wave or sky wave propagation or satellite transponder. Radius of earth = $6.4\times { 10 }^{ 6 }m$; maximum number density of electrons in ionosphere = ${ 10 }^{ 12 }{ m }^{ -3 }$ 


evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. $9MHz$

  2. $5MHz$

  3. $4MHz$

  4. All of these.

Show answer
Correct Option: A
Explanation:
Height of the ground transmitter $=30\ cm$
Range of transmission $=100\ km$
maximum distance covered by space wave propagation is
$d=\sqrt{2\ Rh}$
$=\sqrt{2\times 64\times 10^{6}\times 300}$
$=62\ km$
critical frequency for ionospheric propagation is, 
$F _{C}=9(N _{max})^{112}$
$=9(10^{12})^{112}$
$=9\times 10^{6}=9\ MHZ$

Deficiency diseases can be prevented by eating a balanced diet.

evs - i food and health effect on general health diet, drugs and disease nourishment and malnutrition diseases caused by changes in lifestyle

  1. True

  2. False

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Correct Option: A
Explanation:
Deficiency disease is a disease caused by a lack of essential dietary elements and especially a vitamin or mineral. A  balanced diet is the diet that focuses on providing all the nutrients that the body needs. It comprises of macronutrients like protein, carbohydrates and fat along with micronutrients like vitamins and minerals. Hence, by eating a balanced diet, deficiency diseases can be prevented.
So, the given statement is true.

A balanced diet for the body should contain a variety of food items.

evs - i food and health effect on general health diet, drugs and disease nourishment and malnutrition diseases caused by changes in lifestyle

  1. True

  2. False

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Correct Option: A
Explanation:
A  balanced diet is the diet that focuses on providing all the nutrients that the body needs. It comprises of macronutrients like protein, carbohydrates and fat along with micronutrients like vitamins and minerals. All these nutrients can be found in a variety of food items. Hence, A balanced diet for the body should contain a variety of food items.
So, the given statement is true.

To keep people healthy, strong, energetic and long-lived, it is necessary to provide them with

evs - i food and health effect on general health diet, drugs and disease nourishment and malnutrition diseases caused by changes in lifestyle

  1. High energy food

  2. Large amount of food

  3. Balanced diet

  4. Initiative and spirit

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Correct Option: C
Explanation:

For a healthy living, we require a balanced diet. A balanced diet is one which contains correct proportion of carbohydrates, fats and proteins. It should provide us with necessary minerals and vitamins. Roughage or fiber is also an important part of balanced diet. The proper diet should be taken along with proper water intake for a healthy living.

Which of the following type of nutrients help to produce energy?

evs - i food and health effect on general health diet, drugs and disease nourishment and malnutrition diseases caused by changes in lifestyle

  1. Carbohydrates

  2. Vitamins

  3. Minerals

  4. Proteins

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Correct Option: A
Explanation:
  • The three main nutrients used for energy are carbohydrates, protein, and fats, with carbohydrates being the most important source. 
  • Your body can also use protein and fats for energy when carbohydrates have been depleted.
  •  When you eat, your body breaks down nutrients into smaller components and absorbs them to use as fuel. Hence, carbohydrates are a type of nutrients help to produce energy.
So, the correct answer is 'carbohydrates'.

The combination of foods providing protein quality nearest to that of meat is

evs - i food and health effect on general health diet, drugs and disease nourishment and malnutrition diseases caused by changes in lifestyle

  1. Bread and butter

  2. Wheat, dal and groundnuts

  3. Groundnuts and jaggery

  4. Sprouted gram and groundnuts

Show answer
Correct Option: D
Explanation:

For acute cases of protein deficiency, individuals are recommended to use  high protein diets so as tho help them rebuild muscles. While high protein diets include meals enriched with foods like eggs, meats, milk, chicken, seafood, and fish, vegetables like legumes and nuts also give in an ideal supply of proteins. However, to match the protein quality nearest to meat individuals need to take in sprouted grams, groundnuts and soy products.

Balanced diet is necessary for maintaining healthy body.

evs - i food and health effect on general health diet, drugs and disease nourishment and malnutrition diseases caused by changes in lifestyle

  1. True

  2. False

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Correct Option: A
Explanation:

A balanced diet is one which contains all the nutrients in an appropriate amount necessary for growth, energy production, 'physiological regulation, metabolic requirements, replacement and regeneration of living body. Balanced diet provides us with substances like proteins,carbohydrates, fats, minerals and vitamins without which proper growth and health is not possible.maintenance of

A balanced diet includes

evs - i food and health effect on general health diet, drugs and disease nourishment and malnutrition diseases caused by changes in lifestyle

  1. Vegetarian and non-vegetarian dishes

  2. Salty and sweet dishes

  3. Carbohydrates, fats and proteins

  4. All nutrients, water and roughage

Show answer
Correct Option: D
Explanation:

A balanced diet is one that gives the body the nutrition it needs to function properly. To get a balanced nutrition, one should obtain the majority of the daily calories from fresh fruits and vegetables, whole grains and lean proteins. In addition of this, water and roughage complete the balanced diet.
Therefore, the correct answer is option D.