Tag: safety and first aid

Quizzes (4) Questions (111)

Questions Related to safety and first aid

Multiple choice evs sources of water the lithosphere and the hydrosphere first aid safety and first aid

Biochemical Oxygen Demand (BOD) in a river water :

  1. Increases when sewage gets mixed with river water

  2. Remains unchanged when algal bloom occurs

  3. has no relationship with concentration of oxygen in the water

  4. Gives a measure of Salmonella in the water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

BOD measures the amount of oxygen required by aerobic microorganisms to decompose organic matter. Sewage contains high levels of organic matter, which increases microbial activity and thus increases BOD.

Multiple choice evs sources of water the lithosphere and the hydrosphere first aid safety and first aid

What happens when rain falls on soil without vegetational cover?

  1. Rain water percolates in soil efficiently

  2. Rain water causes loss of surface soil

  3. Rain water leads to fertility of the soil

  4. Rain water does not cause any change in soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Vegetation cover on the ground helps to hold the soil in place. It also helps in percolating water into the deeper layers of the soil. The absence of vegetational cover may lead to soil erosion.

So, the correct answer is option B.

Multiple choice evs sources of water the lithosphere and the hydrosphere first aid safety and first aid

Abundant source of inonazite sands are found on the sea shores of

  1. Maharashtra

  2. West Bengal

  3. Tamil Nadu

  4. Kerala
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kerala's coastline, particularly in areas like Chavara and Manavalakurichi, has significant deposits of monazite sands (likely 'inonazite' is a typo). These mineral sand deposits contain rare earth elements and thorium. Maharashtra, West Bengal, and Tamil Nadu have other mineral resources but are not the primary source of these specific sands.

Multiple choice evs - i sources of water the lithosphere and the hydrosphere first aid safety and first aid

When the air temperature increases, the saturation vapor pressure will:

  1. Increase

  2. Decrease

  3. Remain the same

  4. Vary over an increasingly broad range of values
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Saturation vapor pressure is a function of temperature; as air temperature increases, the kinetic energy of water molecules increases, allowing more to exist in the vapor phase.