NEET Test 151

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NEET Test 151

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Weekly Quiz Competition

Question 1
4 / -1

The stabilization of a dispersed phase in a lyophobic colloidal solution is due to:

A
The adsorption of charged substance on dispersed phase

B
The large electrokinetic potential developed in the colloid

C
The viscosity of the medium

D
The formation of an electrical layer between two phases

Solution

There is adsorption of common ion on the colloidal solution and an electrical double layer is formed. Thus, the dispersed phase in a lyophobic colloidal solution is stabilized.
Question 2
4 / -1

Which of the following types of pregnancy carries the highest risk of miscarriage?

A
Singleton pregnancy

B
Dichorionic diamniotic (DCDA) twins

C
Monochorionic diamniotic (MCDA) twins

D
Monochorionic monoamniotic (MCMA) twins

Solution

The most serious complication facing Monochorionic monoamniotic (MCMA) twins is a life-threatening vascular accident related to the entanglement of the twin umbilical cords. This complication can result in the death of one or both twins. In earlier series, fetal mortality rates of over 50% were reported.
Question 3
4 / -1

Which of the following is true for the resultant polymer product formed, when molecules of phthalic acid react with molecules of glycerol?

A
Branch polymer

B
Cross-link polymer

C
Linear polymer

D
None of the mentioned

Solution

The reaction between phthalic acid and glycerol initially results in linear or branched polymer but, due to the trifunctionality of glycerol, ultimately cross-linking takes place between the molecules. A trifunctional monomer can be linked to two other molecules under appropriate conditions.

Examples are :

A polyfunctional molecule can react with more than two other molecules to form the corresponding number of new bonds during the polymerization reaction.
Question 4
4 / -1

Peroxy linkage is present in:

A
Caro's acid

B
Pyrosulphuric acid

C
Sulphurous acid

D
Dithionic acid

Solution

Phosphorus has one double-bonded oxygen atom, two hydroxyl groups and one peroxy linkage. H₂SO₅ is known as peroxomonosulphuric acid. It is also known as Caro's acid.
Question 5
4 / -1

The process where a population inhibits the growth of other population without affecting itself is known as:

A
Amensalism

B
Parasitism

C
Mutualism

D
Commensalism

Solution

Amensalism is an interaction between two living individuals or populations of different species in which one organism or population does not allow, other organism or population to grow or live near it. Inhibition is achieved through the secretion of chemicals called allochemics. E.g., the roots and hulls of black walnut (Juglans nigra), produce a chemical called juglone. It is toxic to apple, tomato and alfalfa.
Question 6
4 / -1

The addition polymer which is/are co-polymer are:

(i) Neoprene

(ii) Buna-N

(iii) Nylon-66

(iv) SBR

A
(iv)

B
(ii) and (iv)

C
(iii) and (iv)

D
(i), (ii) and (iii)

Solution

The addition polymer which is/are co-polymer are Buna-N and SBR.

(ii) Buna-N is a copolymer of acrylonitrile and 1,3 - butadiene.

(iv) SBR (Buna-S or styrene butadiene rubber) It is a copolymer of styrene and 1,3 - butadiene.

However, the following are not addition copolymers.

(i) Neoprene is homopolymer of 2 - chlorobuta-1,3 - diene.

(iii) Nylon - 6,6 is a condensation copolymer. The monomers are hexamethylene diamine and adipic acid.
Question 7
4 / -1

A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is:

A

B

C

D

Solution
Question 8
4 / -1

In all the methods of asexual reproduction

A
Offspring produced are genetically identical to the parents

B
Offspring produced are genetically different from the parents.

C
Offspring produced may or may not be identical to the parents

D
None of these

Solution

Offspring produced are genetically identical to the parents as there is a single parent and so no variation is seen at the genetic level of parent and offspring.
Question 9
4 / -1

A coil having 100 turns and area of 0.001𝑚² is free to rotate about an axis. The coil is placed perpendicular to magnetic field of 1.0𝑤𝑏 / 𝑚². The resistance of the coil is 10. If the coil is rotated rapidly through an angle of 180^∘, how much charge will flow through the coil?

A
0.02 coulomb

B
0.04 coulomb

C
0.08 coulomb

D
0.07 coulomb

Solution
Question 10
4 / -1

Which statement is incorrect for the post-mitotic gap phase of interphase?

A
In this phase, the cell is metabolically active and grows continuously.

B
It involves the replication of RNA, DNA, and proteins.

C
Cell organelles increase in number.

D
The cell has an option to stop the cell cycle and undergo differentiation.

Solution

Interphase is the first growth stage after cell division. Three stages occur during interphase i.e. G 1, S, and G 2 stage wherein G 1 stage cells mature by making more cytoplasm and cell organelles. S phase is called the post-mitotic gap phase and during that phase, the cell synthesizes enzyme and energy needed for DNA duplication. It occurs between the G 1 and G 2 phases of the interphase. In the G 2 phase, all cell structures needed for cell division are made. Example: centriole.