Tag: evs - i

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Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

Stalactites are:

  1. thin, fingerlike mineral deposits hanging on the roofs of the caves

  2. the mineral deposits that are left on the floor of the caves when water evaporates

  3. the mineral deposits found in mines

  4. pure minerals extracted from the ores
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stalactites is a type of mineral. It has the following properties. It is layer like mineral, very thin and deposits having finger like shape hanging from caves.

Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

Which one of the following is correct?

  1. All minerals are ores

  2. All ores one minerals.

  3. Metal is extracted from all minerals

  4. Bauxite is an ore of iron
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Minerals are natural elements or compounds occur in earth's crust whereas over are those, which are extracted from minerals without economic loss.

So, all ores are minerals.

Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

A mineral is known as the ore of a metal if the metal:

  1. can not be produced from it

  2. can be produced from it

  3. can be produced from it profitably

  4. present in it, is very costly
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A mineral is known as the ore of a metal if the metal can be produced from it profitably. There can be many minerals of a metal but the ones which undergo purification are known as ores.

Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

Pick the correct statements.

  1. All ores are minerals

  2. All minerals are ores

  3. A mineral cannot be an ore

  4. An ore cannot be a mineral
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Minerals are natural elements or compounds occurs in earth's crust where as ores are those, which are extracted from minerals without economic loss.

All ores are minerals.
Ex: Iron minerals are Siderite and Haematite. But Haematite is only ore.

Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

Mark the incorrect statement.
(a) All minerals contain objectionable impurities.
(b) All minerals are ores.
(c) All minerals can be used to extract metals.

  1. a, b

  2. a, c

  3. b, c

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All minerals doesn't have objectionable impurities. All minerals are not ores. All ores are minerals. All minerals are not used to extract metals. Only ores are used to extract metals.

Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

Buckminster fullerene is the allotropic form of:

  1. nitrogen

  2. carbon

  3. sulphur

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is also called as the bucky ball. It is spherical in shape with the formula $C _{60}$. It has a cage like fused ring structure which resembles a football. Buckminster fullerene is the most commonly occurring fullerene molecule.

Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

Which of the following is the ore of zinc?

  1. Bauxite

  2. Magnetite

  3. Malachite

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

$\displaystyle Calamine$ $\displaystyle ZnCO _3$ is the mineral of zinc.
Hence, option (D) is correct answer.
 
$\displaystyle Magnetite$ $\displaystyle Fe _3O _4$ is iron mineral.

$\displaystyle Malachite $ $\displaystyle Cu _2CO _3(OH) _2$ is mineral of copper.

$\displaystyle Bauxite$ $\displaystyle Al _2O _3 \cdot 2H _2O$ is ore of aluminum.

Multiple choice evs - i constituents of food minerals in our diets types of nutrients nutrients and deficiency

Many minerals can be mined from the deep sea, such as:

  1. gold, nickel and cobalt

  2. copper, manganese and zinc
  3. both $A$ and $B$

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Deep Sea mining is relatively unconventional method of extracting Rare Earth Elements (REE). It is an effective way to obtain a large amounts of rare earth metals. Minerals mined are- $Ag,Au,Cu,Mn,Co$ and $Zn$, etc.