NEET Test 79

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NEET Test 79

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Weekly Quiz Competition

Question 1
4 / -1

The subunits of the protein coat of a virus determine its:

A
Pathogenicity

B
Virulence

C
Genetic material

D
Shape

Solution

The protein coat of a virus called capsid is made of small subunits called capsomeres, which protect the nucleic acid. These capsomeres are arranged in helical or polyhedral geometric forms.

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

Consider an n−p−n transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current?

A
1.1 mA

B
1.01 mA

C
10 mA

D
0.01 mA

Solution
Question 3
4 / -1

An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is 1.227×10⁻²nm, the potential difference is :

A
10V

B
10^{2 V}

C
10^{3 V}

D
10^{4 V}
Question 4
4 / -1

Which of the following combination does not liberate NH₃ gas?

A
Heating of NH₄ClO₄

B
Heating of NH₄Cl

C

D
Li₃N - h₂0

Solution
Question 5
4 / -1

The number of substrate-level phosphorylations in one turn of citric acid cycle is:

A
Zero

B
One

C
Two

D
Three
Question 6
4 / -1

The calculated spin only magnetic moment of Cr²⁺ ion is:

A
5.92 BM

B
2.84 BM

C
3.87 BM

D
4.90 BM

Solution
Question 7
4 / -1

While playing basketball, Amit hurt his thumb. In the X-ray, it was confirmed that the carpal-metacarpal joint of the thumb was fractured. The carpal-metacarpal joint of the thumb is an example of ____________.

A
Saddle joints

B
Hinge joints

C
Ball and socket joints

D
Pivot joints

Solution

The carpometacarpal (CMC) of the thumb is a saddle joint that permits a wide range of motion and is largely responsible for the characteristic dexterity of human prehension. This joint, located at the very base of the thumb, is subject to large physical stresses throughout life.
Hence, the correct option is (A).
Question 8
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
√5 / π

B
√5 / 2π

C
4π / √5

D
2π / √3

Solution
Question 9
4 / -1

Which of the following is correct about the blastocyst?

A
Penetrates endometrium from its embryonic pole.

B
Consists of the outer trophoblast and inner embryoblast.

C
Gets implanted along with zona pellucida.

D
Has a cavity called amniotic cavity.

Solution

The blastocyst is a hollow structure that contains a cluster of cells from which embryo arises. The outer layer provides placenta and other essential tissues for fetal development while the inner cells give rise to the tissues of the body. This outer layer is known as trophoblast which provides nutrients to the embryo. Embryoblast is cells which are situated within the trophoblast and result in the production of an embryo.

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

Which of the following statements is not correct according to molecular orbital theory?

A
The order of energies of molecular orbitals in N₂ molecule is:

B
He₂ is not stable, but is expected to exist.

C
Bond strength of N₂ is the maximum amongst the homonuclear diatomic molecules belonging to the second period.

D
Be₂ and Ne₂ are unstable molecules.

Solution