NEET Test 191

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NEET Test 191

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Weekly Quiz Competition

Question 1
4 / -1

The element Z = 114 has been discovered recently.

It will belong to which of the following family/group and electronic configuration?

A

B

C

D

Solution

Z = 114 belongs to Group 14, carbon family Electronic configuration.

It will belong to carbon family and its electronic configuration is [Rn]5f¹⁴6d¹⁰7s²p². It belongs to seventh period and fourteenth group.
Question 2
4 / -1

Two identical charges of value Q each are placed at (−a,0) and (a,0). The coordinates of the points where the net electric field is zero and maximum are respectively -

A
(0,0), (0,0)

B

C

D

Solution
Question 3
4 / -1

In Calgon's method of removing hardness, which of the following reagents is used?

A
Lime

B
Sodium hexametaphosphate

C
Sodium aluminosilicate

D
Synthetic resin

Solution

Calgon is a trading name of a complex salt, sodium hexametaphosphate (NaPO₃)₆.

It is used for softening hard water. Calgon ionizes to give a complex anion:

(NaPO₃)₆ or Na₂(Na₄P₆O₁₈)? 2Na+ + Na₄P₆O₁₈^2-.

The addition of Calgon to hard water causes the calcium and magnesium ions of hard water to displace sodium ions from the anion of Calgon

Ca²⁺ + Na₄P₆O₁₈^2-? 2Na+ + CaNa₂P₆O₁₈^2-.

From hard water anion of calgon goes into solution. This results in the removal of calcium and magnesium ions from hard water in the form of a complex with Calgon. The water is softened and sodium ions are released into the water.
Question 4
4 / -1

Continued inbreeding, especially close inbreeding, usually reduces fertility and even productivity. This is called

A
Homozygosity

B
Inbreeding depression

C
Pure line

D
Improved breed

Solution

Continued inbreeding, especially close breeding usually reduces fertility and even productivity. This is called inbreeding depression.

Inbreeding depression is the reduced biological fitness in a given population as a result of inbreeding, or breeding of related individuals. Population biological fitness refers to an organism's ability to survive and perpetuate its genetic material.
Question 5
4 / -1

In the absence of carbon dioxide the earth will be:

A
As hot as Thar desert

B
As cold as moon

C
As green as rain forest

D
None of the above

Solution

In the absence of carbon dioxide the earth will be as cold as moon.

CO₂ and clouds help in trapping the infrared radiation that is reflected off Earth's surface.

Without CO₂, the average surface temperature would be near zero degrees Fahrenheit.

The trapping of heat by CO₂ in the atmosphere is also referred to as the greenhouse effect.

A greenhouse is a glass building that provides optimum temperature for plants to grow in cold climates. The glass traps the heat inside to keep it warm.

As CO₂ acts in a very similar way for our atmosphere it is known as a greenhouse gas.
Question 6
4 / -1

The enthalpy change for the adsorption process and micelle formation respectively are

A

B

C

D

Solution
Question 7
4 / -1

The values of the currents i₁ and i₂ flowing through the resistors R₁(= 10Ω) and R₂(=30Ω) respectively, in the circuit diagram with E₁= 3V, E₂ = 3V and E₃= 2V, are:

A
0.2A,0.1A

B
0.4A,0.2A

C
0.1A,0.2A

D
0.2A,0.4A

Solution
Question 8
4 / -1

By what factor must [H⁺] be increased to increase the reduction potential of a hydrogen electrode, having fixed pressure of hydrogen gas, by 0.0282 V?

A
2

B
3

C
4

D
5

Solution
Question 9
4 / -1

Which of the following displaces Br₂ from an aqueous solution containing bromide ions?

A
I₂

B

C
Cl₂

D
Cl⁻

Solution

Since chlorine is more electronegative than bromine, therefore it will displace bromine from an aqueous solution containing bromide ions.

Cl₂+ 2Br⁻→ 2Cl⁻+ Br₂
Question 10
4 / -1

Into how many areas the energy that is received by organisms during energy transfer is converted?

A
One

B
Two

C
Three

D
Four

Solution

The energy that is received during energy transfer which is received by organisms is converted onto three different areas. The three areas are, a)Net Consumer Productivity, b)Metabolic Energy, c) Organic Waste.

Energy is passed between organisms through the food chain. Food chains start with producers. They are eaten by primary consumers which are in turn eaten by secondary consumers. This energy can then be passed from one organism to another in the food chain.