NEET Test 146

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NEET Test 146

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Weekly Quiz Competition

Question 1
4 / -1

The main function of the skin of frog is:

A
The exchange of respiratory gases

B
The storage of fat

C
The storage of energy

D
None of the above

Solution

The main function of the skin of frog is the exchange of respiratory gases.

Skin is the respiratory organ in frogs. A thin water film is formed on the skin of the frog and to retain this thin film of water for a long time, mucus is produced by the mucous glands present in the skin. The oxygen gets dissolved into this thin film of water from where it gets diffused into the blood capillaries. The frogs also have lungs but 80% of respiration takes place through the skin.
Question 2
4 / -1

Formic acid can be distinguished from acetic acid by reaction with:

A

B

C
2,4-dinitrophenylhydrazine

D
N a metal

Solution

Formic acid and acetic acid can be distinguished using 2,4-dinitrophenylhydrazine.

Formic acid is having aldehyde group, so it answers the above test. Forming yellow colour precipitate of 2,4-dinirto phenyl hydrazone. Whereas acetic acid does not.
Question 3
4 / -1

Which of the following feature is responsible to make RNA more labile and easily degradable?

A
Presence of Ribose sugar

B
Presence of uracil instead of thymine

C
Presence of 2'-OH group at every nucleotide

D
Single stranded DNA molecule

Solution

Presence of the 2'-OH group at every nucleotide makes the RNA less stable than the DNA. OH, groups are highly reactive which makes RNA chemically promiscuous. DNA does not have a spare OH group in its sugar molecule. The only OH group is used up in the phosphodiester bonds.
Question 4
4 / -1

Which of the following is/are the characteristic(s) of genes?

A
Replication and transmission to progeny

B
Mutability

C
Storage of hereditary information

D
All of the above

Solution

The human cell contains 23 pairs of chromosomes. The trait is one of the characteristics determined by one or more genes. Abnormal genes and genes that are formed due to new mutations also result in certain traits Mutability. Genes vary in size depending on the code or the protein they produce Replication and transmission to progeny Storage of hereditary information. All cells in the human body contain the same DNA. The difference between the cells occurs due to the different types of genes that are turned on and therefore produce a variety of proteins.
Question 5
4 / -1

Which disease is caused by eating fish found in water contaminated with industrial waste having mercury?

A
Minamata disease

B
Bright's disease

C
Hashimoto's disease

D
Osteosclerosis

Solution

Minamata disease is a disorder caused by methyl mercury poisoning that was first described in the inhabitants of Minamata Bay, Japan and resulted from their eating fish contaminated with mercury industrial waste.
Question 6
4 / -1

The progenitor of the next generation in mature seed is

A
Gamete

B
Spore

C
Oospore

D
Emrbyo

Solution

The progenitor of the next generation in mature seed is Emrbyo.

An embryo is the early stage of development of a multicellular organism. In general, in organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization and continues through the formation of body structures, such as tissues and organs.
Question 7
4 / -1

Direction: For the Assertion (A) and Reason (R) below, choose the correct alternative.

Assertion (A): Neural signals through sympathetic nerves can increase the strength of ventricular contraction.

Reason (R): Parasympathetic neural signals synergistically act with sympathetic neural signals to increase the cardiac output.

A
Both Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation for Assertion (A)

B
Both Assertion (A) and Reason (R) are correct and Reason (R) is not the correct explanation for Assertion (A)

C
Assertion (A) is correct but Reason (R) is incorrect

D
Both Assertion (A) and Reason (R) are incorrect

Solution

The neural signals sent by the sympathetic nerves can increases the strength of ventricular contraction. Parasympathetic neural signals act antagonistically act to the sympathetic neural signal and decrease the cardiac output.

Thus, the correct answer is 'Assertion (A) is correct but Reason (R) is incorrect.'
Question 8
4 / -1

A body of mass m is dropped from a certain height. It has a velocity v when it is at a height ℎ above the ground. Which of the following will remain constant during the free fall?

A

B

C

D

Solution

This is the final speed of an object which falls from a height ℎ with no initial speed to the ground, provided there is no air resistance. So, in this case, it is true.

g is the gravitaitional acceleration of the planet the object is on. Of course, the heavier the planet (or a moon, or a star, or even you), so, objects fall faster towards it. That is why objects fall much faster on Earth than on the Moon.

Since, there is no air resistance, the object doesn't lose or gain energy. So the total energy remains the same.

At the height ℎ, the object has a potential energy = m × g × ℎ

Where, m is the mass of the object
Question 9
4 / -1

A point charge +q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is:

A
Directed perpendicular to the plane and away from the plane

B
Directed perpendicular to the plane but towards the plane

C
Directed radially away from the point charge

D
Directed radially towards the point charge

Solution

When a point charge +q is placed at a distance (d) from an isolated conducting plane, some negative charge develops on the surface of the plane towards the charge and an equal positive charge develops on the opposite side of the plane. Hence, the field at a point P on the other side of the plane is directed perpendicular to the plane and away from the plane as shown in fig.
Question 10
4 / -1

An incorrect statement with respect to S_N1 and S_N2 mechanism for alkyl halide is:

A
A strong nucleophile is an aprotic solvent increases the rate or favours S_N2 reaction

B
S_N1 reactions can be catalysed by some Lewis acids

C
S_N2 reactions can be catalysed by some Lewis acids

D
A weak nucleophile and a protic solvent increases the rate of S_N1 reaction

Solution

S_N1 reaction occurs through the formation of carbocation as intermediate. Hence, rearrangement occurs in S_N1 reaction and not in S_N2 reaction. S_N1 reaction is favoured in presence of a polar protic solvent and a weak nucleophite. These reactions can be catalysed by the some Lewis is acid. A strong nucleophile is an aprotic solvent increases the rate of S_N2 reaction.