NEET Test 101

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NEET Test 101

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Weekly Quiz Competition

Question 1
4 / -1

Which logic gates are represented by the following combination of logic gates?

A
OR

B
NAND

C
AND

D
NOR

Solution
Question 2
4 / -1

The traditional inclusion and multiplication of genes along with the desired genes involves:

A
The hybridization procedures in plant and animal breeding.

B
The hybridization procedures applied only in bacteria.

C
The hybridization procedures only in plant breeding.

D
The hybridization procedures in animal breeding.

Solution

Traditional hybridization procedures used in plant and animal breeding, very often lead to the inclusion and multiplication of undesirable genes along with the desired genes.

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

Which of the following statements about sucrose is/are correct?

A
There is a glycosidic linkage between C-1 of glucose and C-2 of fructose.

B
Acid hydrolysis of sucrose is accompanied by a change in the optical rotation.

C
Hydrolysis of sucrose with a dilute acid yields an equimolar mixture of D-glucose and D-fructose.

D
All of the above

Solution

All the given statements about sucrose are correct.

Sucrose shows a glycosidic linkage between C -1 of glucose and C -2 of fructose, as shown below:

Sucrose is dextrorotatory but on hydrolysis, it gives an equimolar mixture of dextrorotatory [D−(+)]− glucose and laevorotatory [D−(−)−] fructose. Therefore, the hydrolysis of sucrose is accompanied by a change in sign of optical rotation from dextrorotatory to laevorotatory.

On hydrolysis with dilute acids or enzymes, it will give an equimolar mixture of α-D-(+) glucose and β - D - (-) fructose.

Since D-(-)- fructose has a larger specific rotation than D-(+)-glucose, the resulting mixture has a specific rotation of-39.9°. Therefore, the mixture is laevorotatory.

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

A circular coil of radius 10 cm,500 turns and resistance 2Ω is placed with its plane perpendicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through 180^∘ in 0.25 s. Estimate the magnitudes of the emf and current induced in the coil. Horizontal component of the earth's magnetic field at the place is 3.0×10⁻⁵ T:

A
1.5 × 10⁻³ A

B
1.9 × 10⁻³ A

C
1.4 × 10⁻³ A

D
1.2 × 10⁻³ A

Solution
Question 5
4 / -1

Which of the following nutrient is absorbed by the active absorption?

A
Amino acids

B
Glucose

C
Fatty acids

D
Both (A) and (B)

Solution

Absorption is a process by which the end products of digestion pass from the alimentary canal into the blood and lymph through the intestinal mucosa. It is carried out by the passive, active and facilitated type of transport mechanism.

Active transport mechanism occurs against the concentration gradient and is involved in the absorption of amino acids, monosaccharides like glucose, and electrolytes like Na⁺.

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

Carotenoids are:

A
Glycoproteins

B
Hydrocarbons

C
Polysaccharides

D
Lipoproteins

Solution

Carotenoids are the plant pigments that are responsible for imparting bright red, yellow and orange color in the plants. These are water-insoluble pigments, unsaturated molecules built up of isoprene units and are related to phytol structurally.

Hence, the correct option is (B).
Question 7
4 / -1

Which of the following is not a characteristic feature of polygenic inheritance?

A
It is controlled by one pair of genes with contrasting alleles.

B
Polygenic inheritance is related to quantitative traits.

C
It produces continuous variations.

D
F₂ progeny shows continuous variations.

Solution

Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin color, eye color and weight. Polygenes exist in other organisms, as well.

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

Calculate the enthalpy of the formation of H₂O. Is the reaction an exothermic or endothermic reaction?

A
- 333.14 kJ mol^-1

B
+333.14 kJ mol^-1

C
- 285.83 kJ mol^-1

D
+285.83 kJ mol^-1

Solution

The reaction is as follows:

2H₂ + O₂ ------------> 2H₂O

This means that for every 2 molecules of Hydrogen gas, one molecule of Oxygen is needed to make 2 molecules of water

To calculate the enthalpy of this reaction, we use the equation:

Enthalpy of reaction = (Enthalpy of products) - (Enthalpy of reactants)

The Enthalpy of Formations for each molecule are:

H₂ = 0 kJ/mol

O₂= 0 kJ/mol

H₂O = -285.83 kJ/mol

From the equation given earlier, we can put the numbers in and get

Enthalpy = -285.83 - (0+0)

This means Enthalpy of formation of water = -285.83 kJ/mol

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

A thin circular ring of mass M and radius R rotates about an axis through its centre and perpendicular to its plane, with a constant angular velocity ω. Four small particles each of mass m (negligible radius) are kept gently to the opposite ends of two mutually perpendicular diameters of the ring. The new angular velocity of the ring will be

A

B

C

D

Solution

According to the relation between inertia moment and angular velocity,

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

Twenty seven drops of same size are charged at 200 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

A
1980 V

B
660 V

C
1320 V

D
1520 V

Solution

=1980 V

Hence, the correct option is (A).