Tag: evs

Questions Related to evs

Which of the following is true for $CO _2$ concentration ?

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. More in alveolar air than in expired air

  2. More in expired air than in alveolar air

  3. More in inspired air than in alveolar air

  4. More in inspired air than in expired air

Show answer
Correct Option: A
Explanation:

The concentration of expired air is more in the alveolar air than in expired air due to the partial pressure of carbon dioxide in alveoli is more than the atmosphere.

So the correct option is 'More in alveolar air than in expired air'

Hiccough (hiccup) is due to activity of

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. Intercostal muscle

  2. Food in air tract

  3. Diaphragm

  4. Inadequate oxygen in environment

Show answer
Correct Option: C
Explanation:

  • Hiccup is also called as a hiccough. It is an involuntary activity of the diaphragm. During hiccups, the diaphragm muscle shows several involuntary contractions. 
  • When the diaphragm muscle contracts, the opening between the vocal cords snaps shut to check the inflow of air. 
  • This results in the hic or hiccup sound. This results due to irritation of the nerves. 

Thus, the correct answer is 'Diaphragm.'

The diaphragm contracts, resulting in inhalation as the volume of thoracic cavity

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. Decreases in anteroposterior axis

  2. Decreases in dorsoventral axis

  3. Increases in dorsoventral axis

  4. Increases in anteroposterior axis

Show answer
Correct Option: A

Which of the following changes occur in diaphragm and intercoastal muscles when expiration of air takes place?

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

  1. External intercostal muscles relax and diaphragm contracts

  2. External intercostal muscles contracts and diaphragm relaxes

  3. External intercostal muscles and diaphragm relaxes

  4. External intercostal muscles and diaphragm contracts

Show answer
Correct Option: A

The respiratory centre leading to faster breathing is on account of ________________.

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

  1. Venous blood entering the respiratory centre

  2. Arterial blood entering respiratory

  3. Venous blood leaving the respiratory centre

  4. Arterial blood leaving the respiratory centre

Show answer
Correct Option: A
Explanation:

The medulla oblongata is the primary respiratory control centre. Its main function is to send signals to the muscles that control respiration to cause breathing to occur. The respiratory control centre increase respiratory rate on the account of decrease in blood pH, as the oxygenated blood through veins enter the system, decrease in $CO _2$ levels, increased respiratory rate.

Which of the following is an example of fossil fuel?

evs solar energy fuels and fossil fuels solar energy and its applications electric energy generation and environment

  1. Oxygen gas

  2. Hydrogen Gas

  3. Natural gas

  4. Producer gas

Show answer
Correct Option: C
Explanation:

Fuel that is formed from the decay of the dead plants and animals millions of years ago is called fossil fuel. Examples include coal, petroleum, natural gas.

The vast amount of seaweeds present in ocean may provide an endless source of:

evs solar energy fuels and fossil fuels solar energy and its applications electric energy generation and environment

  1. Carbon monoxide

  2. Hydrogen sulphide

  3. Methane

  4. None of these

Show answer
Correct Option: C
Explanation:

Seaweed can be used for the production of biofuel. Methane can be produced via anaerobic digestion of seaweeds.

All of the following are the examples of fossil fuels except:

evs solar energy fuels and fossil fuels solar energy and its applications electric energy generation and environment

  1. petroleum

  2. coal

  3. natural gas

  4. charcoal

Show answer
Correct Option: D
Explanation:

Charcoal is not a fossil fuel since it is obtained by partially burning the wood.

Which is the main constituent of petroleum gas?

evs solar energy fuels and fossil fuels solar energy and its applications electric energy generation and environment

  1. Methane

  2. Ethane

  3. Butane

  4. Hexane

Show answer
Correct Option: C
Explanation:

Liquid petroleum or LPG contains main components as butane and propane with butane forming the major constituents. Sometimes butane is replaced by iso-butane.

Coke is more valuable when used:

evs solar energy fuels and fossil fuels solar energy and its applications electric energy generation and environment

  1. as a fuel for industrial boilers

  2. as an oxidising agent

  3. as a reducing agent

  4. as a fuel in domestic ovens

Show answer
Correct Option: C
Explanation:

Coke is majorly used in the extraction of the metals from their ores. It is used as a reducing agent. Hence, coke is more valuable in metal extraction industry, when used as a reducing agent.