Tag: evs

Questions Related to evs

A geostationary satellite is revolving at a height $6R$ above the earth's surface, where $R$ is the radius of earth. The period of revolution of satellite orbiting at a height $2.5R$ above the earth's surface will be.

evs artificial satellite types of artificial satellites geostationary orbits moon and stars in sky

  1. $\text{24 hour}$

  2. $\text{12 hour}$

  3. $\text{6 hour}$

  4. $6 \sqrt 2\ \text{hour}$

Show answer
Correct Option: D
Explanation:
$\text{The time period of satellite orbiting at a distance from the centre of the earth is given by,}$
$T^2=\dfrac{4\pi^2r^3}{GM^2}$
$\text{where M is the mass of the earth.}$
$\text{Therefore,the ratio of the time periods of two satellites at distance}\ r _1\ \text{and}  r _2$  
$\text{respectively from the centre of the earth is given by,}$ 
$\dfrac{T _1}{T _2}=(\dfrac{r _1}{r _2})^{3/2}$

$\text{or}\ T _2=T _1\left(\dfrac{r _2}{r _1}\right)^{3/2}$
$\text{For the geostationary satellite}\ T _1=1\ \text{day}=24  \text{hours   and} \ r _1 = 6R+R=7R$
$\text{For the other satellite}\quad r _2=2.5R+R=3.5R$
Therefore $T _2=24\times(\dfrac{3.5R}{7R})^{3/2}=24\times(\dfrac{1}{2})^{3/2}=6\sqrt{2}  $ hours

A condition in which feces are discharged from the bowel frequently and in liquid for 

evs science of kitchen assimilation of food and egestion assimilation of food components and importance of food busy at work - our internal organs

  1. Pneumonia

  2. Diarrhea

  3. Typhoid

  4. Malaria

Show answer
Correct Option: B
Explanation:
Diarrhea is the frequent passage of loose, watery, soft stools with or without abdominal bloating, pressure, and cramps. People of all ages can suffer from diarrhea, it can be caused by viruses or bacteria. Most common symptom is watery, liquid stool. Along with this, there are abdominal cramps, fever, bloating, dehydration etc.
Therefore, the correct answer is option B.

Mode of infection in diarrhoea is

evs science of kitchen assimilation of food and egestion assimilation of food components and importance of food busy at work - our internal organs

  1. Food

  2. Water

  3. Air

  4. None of the above

Show answer
Correct Option: A
Explanation:

  1. Diarrhea is the condition of having at least three loose or liquid bowel movements each day. It often lasts for a few days and can result in dehydration due to fluid loss.
  2.  Signs of dehydration often begin with loss of the normal stretchiness of the skin and irritable behavior. This can progress to decreased urination, loss of skin color, a fast heart rate and a decrease in responsiveness as it becomes more severe. 
  3. These infections are often acquired from food or water that has been contaminated by feces, or directly from another person who is infected. Hence, the mode of infection of diarrhea is food.

So, the correct answer is 'food'.

Diarrhoea can be prevented by

evs from tasting to digestion assimilation of food and egestion assimilation of food components and importance of food science of kitchen

  1. Improved sanitation

  2. Clean drinking water

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
Explanation:

Many cases of diarrhea are spread from person-to-person. The following precautions can help an individual avoid diarrhea and other viral or bacterial infections:

Improvement in sanitation for example, Children should be instructed to wash their hands frequently, especially after using the toilets.
Practice safe food handling. Always wash hands before and after handling food.
Drink clean drinking water and never eat raw or undercooked meat or seafood. Hence option C is correct.

Which of the following animal sleeps most of the time during the winter season?

evs super senses sleeping time animal senses sense organs in animals

  1. Sloth

  2. Dog

  3. Lizard

  4. Cat

Show answer
Correct Option: C
Explanation:

There are two kinds of organisms; regulators and conformers. Regulators are those who can maintain their internal body temperature according to the external environment. Example: dog, cat, sloth etc.

Conformers are the organisms that can not maintain internal body temperature according to the environment so they need sleep during harsh climates to survive. Example: lizards, polar bear.
So, the correct option is 'Lizard'.

Hibernation is also called as

evs super senses sleeping time animal senses sense organs in animals

  1. Winter sleep

  2. Summer sleep

  3. Autumn sleep

  4. None of the above

Show answer
Correct Option: A
Explanation:

Aestivation is the summer sleep and hibernation is the winter sleep. They are taken so as to avoid the harsh temperature. It is a dormant phase where the metabolic rate is lowered. For example, Polar bears hibernate and crocodiles aestivate.

So, the correct option is 'Winter sleep'.

Sloth remains awake for

evs super senses sleeping time animal senses sense organs in animals

  1. 7 hours a day

  2. 17 hours a day

  3. 20 hours a day

  4. 2 hours a day

Show answer
Correct Option: A
Explanation:

Sloth has a very low metabolic rate, it sleeps a lot. It sleeps around 15-18 hours a day. A sloth can lower its heart beat rate. After garden snail, sloth is the slowest animal.

So, the correct option is '7 hours a day'.

How many hours do a day cow sleep?

evs super senses sleeping time animal senses sense organs in animals

  1. 5-8 hours

  2. 3-4 hours

  3. 10-15 hours

  4. 20 hours

Show answer
Correct Option: B
Explanation:

  • Cows usually sleep around 3-4 hours a day. But it doesn't happen in a single go, but instead for shorter periods of time. 
  • A cow takes frequent naps throughout the day and especially the night, which typically last between one and five minutes at a time.

So, the correct option is B.

The longest sleeping animal is

evs super senses sleeping time animal senses sense organs in animals

  1. Lizard

  2. Horse

  3. Python

  4. None of the above

Show answer
Correct Option: C
Explanation:

  • A lizard generally sleeps around 60-80 seconds but its longest sleep can be 4 hours.
  • A horse can sleep up to 3 hours a day.
  • A python being the longest sleeping animal can sleep around 2 weeks continuously.
So, the correct option is 'Python'.

Sloth is considered as folivores because 

evs super senses sleeping time animal senses sense organs in animals

  1. They sleep for 17 hours.

  2. The bulk of their diets consists of buds, tender shoots, and leaves.

  3. They are carnivores

  4. None of the above

Show answer
Correct Option: B
Explanation:

A folivore is an organism that is a specialized herbivore and eat leaves. Sloth is an animal that feeds on leave buds and tender shoot. Due to the low metabolic rate, they don't have to eat much. So, they only eat leaves to survive.

So, the correct answer is 'The bulk of their diets consists of buds, tender shoots, and leaves'.