NEET Test 150

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NEET Test 150

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Weekly Quiz Competition

Question 1
4 / -1

Light of wavelength 300 nm is incident on a photo-sensitive surface. The stopping potential for emitted photoelectrons is 2.5V. The wavelength of incident light is reduced to 150 nm. The stopping potential for emitted photoelectrons is:

A
Exactly 5V

B
A little less than 5V

C
A little more than 5V

D
2.5 V

Solution
Question 2
4 / -1

The melting points of Cu, Ag, and Au follow the order:

A
Cu > Ag > Au

B
Cu >Au > Ag

C
Au > Ag > Cu

D
Ag > Au > Cu

Solution

Melting point is defined as the temperature at which a solid start to convert into a liquid state.

It is known that copper, silver, and gold all are transition metals. Their melting points are listed as follows.

Copper- 1984^oF or 1085⁰C

Gold- 1948⁰F or 1064⁰C

Silver- 1763⁰F or 961.8⁰C

Thus, the decreasing order of the melting point of the given elements is as follows.

Cu > Au > Ag
Question 3
4 / -1

Sea otters, an example of a keystone species, limit the density of which of the following species?

A
Sea urchins

B
Steller's sea cow

C
Kelp

D
Corals

Solution

The sea otter is considered a keystone species as their consumption of sea urchins, preventing the destruction of kelp forests caused by the sea urchin population. Kelp forests are critical habitat for many species in nearshore ecosystems.
Question 4
4 / -1

A student forgot to add the reaction mixture to the round-bottomed flask at 27^∘C but instead, he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found that the temperature of the flask was 477^∘C. What fraction of air would have been expelled out?

A

B

C

D

Solution
Question 5
4 / -1

Who observed the different types of cells in plant tissue?

A
Rudolf Virchow

B
Antony Von Leeuwenhoek

C
Theodore Schwann

D
Matthias Schleiden

Solution

Matthias Schleiden was a German botanist who observed the different types of cells present in plant tissue of various types of plants in 1838. Schleiden and Schwann together formulated the cell theory. Schleiden defined the cell as the basic unit of plant structure, and a year later Schwann defined the cell as the basic unit of animal structure.
Question 6
4 / -1

In an isochoric process if will be equal to:

A

B

C

D
None of these

Solution
Question 7
4 / -1

In Young's experiment, 70 fringes are observed in a field of vision if yellow light λ = 5800 Å is used. How many fringes would be observed in the same field of vision if violet light λ = 5800 Å is used?

A
70

B
90

C
53

D
84

Solution
Question 8
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.
Question 9
4 / -1

Which part becomes modified as the tusk of the elephant?

A
Canine

B
Second incisor

C
Premolar

D
Molar

Solution

Second incisor is modified as the tusk of the elephant.

The Tusk of elephants are its second upper incisors made of ivory. In African elephants both males and females possess tusk that may be large, however in Asian elephants, the females have either very short tusks or no tusks at all. Canines have a sharp, pointy surface for tearing food. The premolar is also called bicuspid, permanent teeth situated between molars. The molars are large, flat at the back of the mouth, they are used to grind food during chewing.
Question 10
4 / -1

A naturally occurring coding strand composed of alternating C and U residues would result in the formation of:

A
A polypeptide containing alternating leucine and serine residues

B
A polypeptide containing either leucine or serine residues

C
A polypeptide containing only leucine residues

D
A polypeptide containing only serine residues

Solution

A naturally occurring coding strand composed of residues C and U alternately, resulting in a polypeptide construct, as CUC and UCC encoding for leucine and serine, respectively. Examples of hydrophobic residues are: leucine, isoleucine, phenylalanine, and valine, and to a lesser extent tyrosine, alanine, and tryptophan. The charge of the side chain plays an important role in protein structures, as ion bonding can stabilize protein structures and disrupt a non-coupled charge structure in the middle of the protein. Serine and threonine have a hydroxyl group and aspergine and glutamine have an amide group. Because CUC and UCC code for respectively Leucine and Serine.