NEET Test 109

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NEET Test 109

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Weekly Quiz Competition

Question 1
4 / -1

The process by which ATP is produced in the inner membrane of a mitochondrion. The electron transport system transfers protons from the inner compartment of the outer; as the protons flow back to the inner compartment, the energy of their movement is used to add phosphate to ADP, forming ATP.

A
Chemiosmosis

B
Phosporylation

C
Glycolysis

D
Fermentation

Solution

Chemiosmosis is the diffusion of ions across a selectively permeable membrane. More specifically, it relates to the generation of ATP by the movement of hydrogen ions across a membrane during cellular respiration.

ATP synthase is the enzyme that makes ATP by chemiosmosis. The generation of ATP by chemiosmosis occurs in chloroplasts and mitochondria as well as in some bacteria.

Hence, the correct option is (A).
Question 2
4 / -1

A uniform rod of length 200 cm and mass 500 g is balanced on a wedge placed at 40 cm mark. A mass of 2 kg is suspended from the rod at 20 cm and another unknown mass 'm' is suspended from the rod at 160 cm mark as shown in the figure. Find the value of 'm' such that the rod is in equilibrium.

(g = 10 m/s²)

A
1/12 kg

B
1/2 kg

C
1/3 kg

D
1/6 kg

Solution
Question 3
4 / -1

The unit of length convenient on the atomic scale is known as an angstrom and is denoted by A : 1 A = 10⁻¹⁰m. The size of a hydrogen atom is about 0.5Å. What is the total atomic volume in m³ of a mole of hydrogen atoms?

A

B

C

D

Solution
Question 4
4 / -1

The relation between internal energy U, pressure P and volume V of gas in an adiabatic process is U = a + bPV, where a and b are constants. What is the effective value of adiabatic constant γ ?

A
a/b

B
b+1 / b

C
a+1 / a

D
b/a

Solution
Question 5
4 / -1

The electric field due to a uniformly charged non-conducting sphere of radius R as a function of the distance from its centre, is represented graphically by

A

B

C

D

Solution
Question 6
4 / -1

Two different first order reactions have rate constants k₁ and k₂ at T₁(k₁> k₂). If temperature is increased from T₁ to T₂, then new constants become k₃ and k₄ respectively. Which among the following relations is correct?

A

B

C

D

Solution

As given, the temperature is increased from T₁ to T₂, then new constants become k₃ and k₄ respectively.

Rate constant increases with increase in temperature.

So, k₁< k₃ and k₂< k₄.

Hence, the correct option is (B).
Question 7
4 / -1

The movement of water and minerals in xylem and the movement of phloem sap in phloem is ________ and ________ respectively.

A
Unidirectional, bidirectional

B
Bidirectional, bidirectional

C
Bidirectional, unidirectional

D
Unidirectional, unidirectional

Solution

The movement of water and minerals in xylem and the movement of phloem sap in phloem is unidirectional and bidirectional respectively. Plants need water for their growth, and it uptakes water through the roots. Water that is taken by the roots has to reach all the leaves or branches, here the xylem function as transportation of water. Therefore, the movement of water and minerals in xylem is always an unidirectional. Whereas, the movement of phloem is bidirectional this is because, once the food is synthesized it is the phloem that transfers the food to all the parts of plants wherever it is necessary.

Hence, the correct option is (A).
Question 8
4 / -1

Which of the following STDs cannot be treated with antibiotics?

(i) Gonorrhoea

(ii) Syphilis

(iii) Chlamydia

(iv) Genital herpes

A
Only (iv)

B
(ii) and (iv)

C
(iii) and (iv)

D
Only (iii)

Solution

Sexually transmitted diseases or infections caused by bacteria can be treated while viral infections can just be managed and not cured. A single dose of antibiotic can cure STDs like gonorrhoea, syphilis, chlamydia. However, diseases such as Genital Herpes or HIV can be managed only with anti-viral drugs. These drugs cannot cure the infection but only limit the length and severity of outbreaks. Further, it can reduce the likelihood of transmission of the disease.

Hence, the correct option is (A).
Question 9
4 / -1

Which one of the following has the most nucleophilic nitrogen?

A

B

C

D

Solution

Nucleophiles are the species which have an excess of electrons.

Among the given species, the lone pair of nitrogen of pyrrole (B) is involved in the delocalization of the ring, thus, they are not available for donation.

In aniline (D), the lone pair is involved in conjugation with the π electrons of the ring while in pyridine, these are relatively free for donation. Thus, the nitrogen of pyridine (A) is the most nucleophilic.

Phenyl and −COCH₃both are electron-withdrawing groups, thus decreases the nucleophilicity of nitrogen.

Hence, the correct option is (A).
Question 10
4 / -1

Which of the following functions is/are performed by the cnidoblasts present on the tentacles of a coelenterate?

A
Digestion

B
Anchorage

C
Defence and capturing the prey

D
Both (B) and (C)

Solution

All Cnidarians have tentacles with stinging cells in their tips which are used to capture and subdue prey. In fact, the phylum name "Cnidarian" literally means "stinging creature." The stinging cells are called cnidocytes and contain a structure called a nematocyst. The nematocyst is a coiled thread-like stinger. Stinging justifies their anchorage and defense.

Hence, the correct option is (D).