NEET Test 113

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NEET Test 113

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following plot is correct about the kinetic energy of photoelectrons?

A

B

C

D

Solution

Here plot in option (A) is correct as kinetic energy of photoelectrons is independent of the intensity of radiation. The highest kinetic energy of the optical electron does not depend on the intensity of incident radiation. The opposing potential changes with the frequency of incident radiation.

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

Which of the following is/are iron-sulfur protein(s) mediating electron transfer in certain metabolic reactions?

A
Cytochromes

B
Ferredoxins

C
Plastocyanin

D
β-Carotene

Solution

Ferredoxin (Fd) is comprised of ubiquitous, small proteins containing one or two iron-sulfur clusters. These prosthetic groups contain iron and sulfur atoms, organized in three different types of centers: 2Fe–2S, 4Fe–4 S, and 3Fe–4S. The presence of the cluster(s) confers to the protein the property of absorbing light in the visible region. Fd solutions are thus reddish-brown in the oxidized state and fade upon reduction.

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

The ionic mobility of alkali metal ions in aqueous solution is maximum for:

A
Li⁺

B
Na⁺

C
K⁺

D
Rb⁺

Solution

The alkali metal ion exist as hydrated ions M⁺(H₂O)_nin the aqueous solution. The degree of hydration, decreases with ionic size as we go down the group. Hence Li⁺ ion is mostly hydrated e.g., [Li(H₂O)₆]⁺. Since the mobility of ions is inversely proportional to the size of their hydrated ions, hence the increasing order of ionic mobility is Li⁺< Na⁺< K⁺< Rb⁺

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

The half-life of Pa −218 is 3 minutes. What mass of a 16g sample of Pa−218 will remain after 15 minutes?

A
3.2g

B
2.0g

C
1.6g

D
0.5g

Solution
Question 5
4 / -1

An analysis of chromosomal DNA using the Southern hybridization technique does not use:

A
Electrophoresis

B
Blotting

C
Autoradiography

D
PCR
Solution
An analysis of chromosomal DNA using the Southern hybridization technique does not use PCR.

E.M Southern(1979) discovered is a hybridization technique known as Southern blotting for the identification of the particular size of DNA from the mixture of other similar molecules. This technique is based on the principle of separation of DNA fragments by gel electrophoresis and identified by labelled probe hybridization. The various steps involved in this technique are:
- Isolation of DNA
- Digestion of DNA by restriction endonucleases
- Separation of DNA fragments by electrophoresis
- Blotting- transferring separated DNA fragments to synthetic membranes, such as nitrocellulose or nylon
- Hybridisation using labelled VNTR probe
- Detection of hybridised DNA fragments by autoradiography.
Hence, the correct option is (D).
Question 6
4 / -1

A small object of uniform density rolls up a curved surface with an initial velocity v′. It reaches up to a maximum height of with respect to the initial position. The object is

A
Ring

B
Solid sphere

C
Hollow sphere

D
Disc

Solution
Question 7
4 / -1

Which of the following statements is not correct?

A
The tertiary structure of proteins is three-dimensional.

B
In globular proteins, nearly all the hydrophobic groups are hidden inside and the polar groups are present on the surface, resulting into a spheroidal shape.

C
Only hydrogen bonds are involved in the tertiary structure of proteins.

D
Globular proteins are soluble in water.

Solution

The overall three-dimensional structure of a polypeptide is called its tertiary structure. The tertiary structure is primarily due to interactions between the R groups of the amino acids that make up the protein.Similarly, polar R groups can form hydrogen bonds and other dipole-dipole interactions.

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

A smooth sphere "A" is moving on a frictionless horizontal surface with angular speed ω and centre of mass velocity v. It collides elastically and head-on with an identical sphere B at rest. Neglect friction everywhere. After the collision, their angular speeds are ω_A and ω_B, respectively. Then,

A

B

C

D

Solution

As the spheres are smooth there will be no friction (no torque) and therefore there will be no transfer of angular momentum.

Thus A, after collision will remain with its initial angular momentum

i.e., ω_A=ω

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

Directions For Questions

A few statements describing certain features of reproduction are given below:

I. Gametic fusion takes place.

II. Transfer of genetic material takes place.

III. Reduction division takes place.

IV. Progeny has some resemblance with parents.

...view full instructions

Select the options that are true for both asexual and sexual reproduction from the options given below:

A
I and II

B
II and III

C
II and IV

D
I and III

Solution

In both types of reproduction (asexual and sexual), there is a transfer of genetic material from parent to offspring which have some resemblances with their parents. Reduction division (meiosis) has to occur if a diploid body has to produce haploid gametes that are in case of sexual reproduction only. Gametic fusion The formation of male and female gametes and their fusion to form the zygote also takes place only in sexual reproduction.

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

Hard water when passed through ion exchange resin containing R′COOH groups, becomes free from:

A
CI^-

B

C

D

Solution

An ion exchange resin containing R−COOH group exchange cations like when hard water is passed through it. This resin is called cation exchange resin.

Hence, the correct option is (D).