NEET Test 91

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NEET Test 91

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Weekly Quiz Competition

Question 1
4 / -1

A rigid body is made of three identical thin rods fastened together in the form of a letter H. The body is free to rotate about a horizontal axis that passes through one of the legs of H. The body is allowed to fall from rest from a position in which the plane of the H is horizontal. Then the angular speed of the body when the plane of the H is vertical is -

A

B

C
-

D
None of these

Solution
Question 2
4 / -1

Resultant force acting on a diamagnetic material in a magnetic field is in direction:

A
From stronger to the weaker part of the magnetic field

B
From weaker to the stronger part of the magnetic field

C
Perpendicular to the magnetic field

D
In the direction making 60^∘ to the magnetic field

Solution

Resultant force acting on a diamagnetic material in a magnetic field is in direction from stronger to the weaker part of the magnetic field. Diamagnetic substances are those which have tendency to move from stronger to the weaker part of the external magnetic field. In other words, unlike the way a magnet attracts metals like iron, it would repel a diamagnetic substance.

Hence, the correct option is (A).
Question 3
4 / -1

Which of the following technique can be used to detect genetic disorders in humans?

A
Polymerase Chain Reaction (PCR)

B
Gel electrophoresis

C
Chromatography

D
Spectroscopy

Solution

Polymerase Chain Reaction (PCR) technique can be used to detect genetic disorders in humans.

Polymerase Chain Reaction (PCR) is a technique that can amplify a target DNA segment. This amplified segment aids in the detection of various genetic disorder and further studies. It is a revolutionary method developed by Kary Mullis in the 1980s. Polymerase Chain Reaction (PCR) is based on using the ability of DNA polymerase to synthesize new strand of DNA complementary to the offered template strand. Because DNA polymerase can add a nucleotide only onto a preexisting 3'-OH group, it needs a primer to which it can add the first nucleotide.

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

Which of the following refer to correct example(s) of organisms which have evolved due to changes in the environment brought about by anthropogenic action?

(a) Darwin’s Finches of Galapagos islands.

(b) Herbicide-resistant weeds.

(c) Drug-resistant eukaryotes.

(d) Man-created breeds of domesticated animals like dogs.

A
Only (a)

B
(a) and (c)

C
(b), (c) and (d)

D
Only (d)
Question 5
4 / -1

Systematics or Taxonomy means _______________.

A
Identification

B
Nomenclature

C
Classification

D
All of the above

Solution

Systematics or Taxonomy means identification, nomenclature and classification.

Systematics is the study of biological diversity and its origins. It focuses on understanding evolutionary relationships among organisms, species, higher taxa, or other biological entities, such as genes, and the evolution of the properties of taxa including intrinsic traits, ecological interactions, and geographic distributions. An important part of systematics is the development of methods for various aspects of phylogenetic inference and biological nomenclature/classification.

Taxonomy is the classification and naming of organisms in an ordered system that is intended to indicate natural relationships, especially evolutionary relationships.

Hence, the correct option is (D).
Question 6
4 / -1

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is

A
Isothermal

B
Adiabatic

C
Isochoric

D
Isobaric
Question 7
4 / -1

The process of a muscle contracting is a complex process. Which of the following statements does not characterise muscle contraction in humans?

A
A nervous impulse comes at the neuromuscular junction and from the terminal, acetylcholine is released.

B
In the presence of high concentrations of calcium, the calcium binds to tropomyosin.

C
The breakdown of ATP helps in the shortening of the muscle.

D
The myosin leaves the actin and the cross-bridge is broken when an ATP molecule binds to the myosin head.

Solution

Troponin, which regulates the tropomyosin, is activated by calcium, which is kept at extremely low concentrations in the sarcoplasm. If present, calcium ions bind to troponin, causing conformational changes in troponin that allow tropomyosin to move away from the myosin-binding sites on actin.

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

Which one is the correct order of acidity?

A

B

C

D

Solution

Alkanes, alkenes and alkynes follow the following trend in their acidic behaviour.

This is because sp-hybridized carbon is more electronegative than sp² - hybridized carbon which is furthermore electronegative than sp³- hybridized carbon. Hence, in ethyne proton can be released more easily than ethene and ethane.

Among alkynes the order of acidity is:

This is due to +I effect of −CH₃ group.

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

Equal volumes of the following solutions are mixed. In which of these solutions will precipitation occur?

A
Only (iv)

B
(i) and (ii)

C
(ii), (iii), and (iv)

D
Only (iii)

Solution
Question 10
4 / -1

When a coil moves towards a stationary magnet, the induced emf does not depend on:

A
Speed with which the coil or magnet is moving

B
Number of turns in the coil

C
Strength of the magnet

D
Resistance of the coil

Solution

When a magnet is brought near a conducting loop along its axis, the distance between the loop and the magnet will reduce so the intensity of the magnetic field associated with the loop also increases.

Because the magnetic field associated with the loop increases so the magnetic flux linked with the loop also increases.

So in this case the magnetic flux is changing, hence an electric current will generate.

From the above equation, it is cleared that the induced emf depends upon the magnetic field and number of turns and it is independent of the resistance of the coil.

Hence, the correct option is (D).