NEET Test 160

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NEET Test 160

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Weekly Quiz Competition

Question 1
4 / -1

During the denaturation of proteins, which of these structures will remain intact?

A
Primary

B
Secondary

C
Tertiary

D
Quaternary

Solution

During the denaturation of proteins hydrogen bonds are disturbed. As a result, the secondary and tertiary structures are destroyed but the primary structures remain intact.
Question 2
4 / -1

Cyanide process is used for the extraction of

A
Barium

B
Aluminium

C
Boron

D
Gold

Solution

The cyanide process, also called the Macarthur-Forrest Process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide.
Question 3
4 / -1

A millivoltmeter of 25 mV range is to be converted into an ammeter of 25 A range. The value (in ohm) of the necessary shunt will be:

A
0.001

B
0.01

C
1

D
0.05

Solution

The galvanometer is converted into an ammeter, by connecting a shunt, in parallel with it.
Question 4
4 / -1

Hepatic portal system connects:

A
Digestive system to liver

B
Kidney to liver

C
Liver to digestive system

D
Liver to kidney

Solution

The venous system comprising of the hepatic portal vein and other veins. It is responsible for directing blood from the region of the gastrointestinal tract between the esophagus and rectum and also includes venous drainage from the supplementary organs such as the spleen to the liver. The hepatic portal system is so named since it connects capillaries of the intestine and other digestive organs to modified capillaries (hepatic sinusoids) of the liver. As intestinal blood is nutrient rich for few hours after having a meal, this system is able to detect available nutrients before the blood goes to rest of the body. It also plays the role in cleansing the blood by removing the bacteria and toxins present in it.
Question 5
4 / -1

A circular disc X of radius R is made from an iron plate of thickness t and another disc Y of radius 4R is made from an iron plate of thickness t/4. The relation between the moments of inertia I_x and I_y is

A

B

C

D

Solution
Question 6
4 / -1

A 0.1M aqueous solution of a weak acid is 2% ionised. If the ionic product of water is 1 × 10⁻¹⁴ mol²dm⁻⁶, then [OH^-] is:

A
5 × 10⁻¹²M

B
2 × 10⁻³M

C
1 × 10⁻¹⁴M

D
None of these

Solution
Question 7
4 / -1

Which of the following is correct about keystone species in an ecosystem?

A
The number is maximum in an ecosystem.

B
They aren't required in an ecosystem.

C
They have the largest biomass in an ecosystem.

D
They are the main contributors to ecosystem properties.

Solution

An ecosystem is a natural unit that includes all organisms of a particular region, ie plants, animals, and molecules that interact with their abiotic environment to form a complete biological unit. Thus ecosystems are a unit of interdependent organisms that divide the same habitat. The ecosystem usually forms many food webs that show the interdependence of these organisms and the flow of energy within the ecosystem. In which they depend on each other for their food, food and other biological activities. The keystone species in an ecosystem are those who are the main contributors to the ecosystem.
Question 8
4 / -1

Monothecous stamens are found in:

A
Sunflower

B
Pea flower

C
Shoe flower

D
Mustard

Solution

Monothecous stamens are found in "Shoe flower".

Stamen is the male reproductive structure of the flower. It consists of anther and filament. The anther can be monoecious or dithecous.

The stamen consists mainly of two parts that are anther and filament. The filament is the stalk that is slender and tall in shape. The filament bears an anther distally. In general, the anther can be classified as lobes. The anther can have one lobe or it can also have two lobes. When it has only one lobe then it is called monoecious, while when it has two lobes it is called dithecous as the name suggests.

Inside each of the lobes of the anther, there are two pollen sacs which are called microsporangia. The monothecous anthers consist of two microsporangia while dithecous anthers consist of tetra microsporangia.

The shoe flower is the other name for Hibiscus rosa-Sinensis or China rose. It belongs to the family of Malvaceae. The anthers of the family Malvaceae are called monoecious.
Question 9
4 / -1

The ratio of radii of the earth to another planet is 2/3 and the ratio of their mean densities is 4/5. If an astronaut can jump to a maximum height of 1.5 m on the earth, with the same effort, the maximum height he can jump on the planet is

A
1 m

B
.8 m

C
.55 m

D
2 m

Solution
Question 10
4 / -1

Which is the most abundant protein in the animal word?

A
Trypsin

B
Haemoglobin

C
Collagen

D
Insulin

Solution

Collagen is an insoluble fibrous protein found extensively in the connective tissue of skin, tendons, and bone. Collagen accounts for over 30% of the total 144 body proteins of mammals and it is the most abundant animal protein.