NEET Test 165

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NEET Test 165

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Weekly Quiz Competition

Question 1
4 / -1

Dimensional formula and unit of potential difference:

A

B

C

D

Solution
Question 2
4 / -1

Which of the following electronic transitions in the line spectrum of He⁺ will have the same wavelength as that of the first line in the Lyman series of hydrogen atoms?

A
4 ← 2

B
2 ← 1

C
3 ← 1

D
4 ← 1

Solution
Question 3
4 / -1

The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as:

A
Transformation

B
Translocation

C
Crossing over

D
Chromosomal aberration

Solution

The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as crossing over.

Translocation is the process of exchange of segments of two non-homologous pairs of chromosomes.

Chromosomal aberration is the alteration in the chromosome number or structural changes within the chromosome.

Transformation is the process of transfer of DNA from one bacterial cell to another.
Question 4
4 / -1

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

A
Magnesium and Chlorine

B
Manganese and Chlorine

C
Manganese and Potassium

D
Magnesium and Molybdenum

Solution

The oxygen evolved during photosynthesis comes from water molecules. Manganese and Chlorine elements is involved in this reaction.

The breakdown of water molecules into hydrogen and oxygen in the presence of light, during the light reaction of photosynthesis is called photolysis of water. The micronutrients manganese and chlorine are involved in the photolysis of water.

Magnesium- It is component of chlorophyll and activator of enzymes involved in respiration and photosynthesis.

Potassium- It is required as a cofactor for many enzymes and maintains membrane permeability, turgidity of cells, anion-cation balance in cells.

Molybdenum- It is component of enzyme nitrate reductase and is involved in nitrogen metabolism.
Question 5
4 / -1

Which of the following animals have a single opening to the outside that serves both as mouth as well as anus?

A
Octopus

B
Asterias

C
Ascidia

D
Fasciola

Solution

Fasciola hepatica (Sheep liver fluke) belongs to phylum-Platyhelminthes. These worms have an incomplete alimentary canal, there is a single opening for both digestion and egestion. This is also called as blind sac body plan.
Question 6
4 / -1

Which of the following statements are TRUE?

1. H₂S is more acidic than H₂Te.

2. Ozone is thermodynamically more stable than oxygen.

3. The two oxygen-oxygen bond lengths in the ozone molecule are identical.

4. Rhombic sulphur is the stable form of sulphur at room temperature.

A
Both 1 and 2

B
Both 1 and 4

C
Both 2 and 3

D
Both 3 and 4

Solution

H₂S is less acidic than H₂Te because as we move down the group, the bond dissociation enthalpy decreases i.e it becomes easy to dissociate or break the bonds.

Ozone is thermodynamically less stable than oxygen because its decomposition into oxygen results in the liberation of heat (is negative) and an increase in entropy (is positive).
Question 7
4 / -1

Which part of the brain controls the heart?

A
Spinal Cord

B
Medulla Oblongata

C
Neuron

D
None of these
Solution
Human brain is the central organ of the human nervous system The brain can be divided into three basic units: the forebrain, the midbrain, and the hindbrain.

Fore-brain:
- The forebrain structures include the cerebrum, thalamus, hypothalamus, and pituitary gland.
- Cerebral hemispheres make up the uppermost portion of the brain and are involved in the sensory mechanisms, and control of voluntary movements, such as speech.
- The thalamus is the main relay centre between the medulla oblongata and the cerebrum.
- Hypothalamus is an important control centre for sex drive, pleasure, pain, hunger, thirst, blood pressure, body temperature, and other visceral functions.
- Hypothalamus produces hormones that control the secretions of the anterior pituitary gland, and it also produces oxytocin.
Mid-brain:
- The midbrain lies between the thalamus and pons.
- Midbrain serves important functions in motor movement, particularly movements of the eye, and in auditory and visual processing.
Hind-brain:

There are three main parts of the hindbrain - pons, cerebellum, and medulla oblongata.
- Pons regulate respiration.
- Cerebellum helps with the coordination and movement related to motor skills, especially involving the hands and feet.
- Medulla Oblongata plays an essential role in passing messages between your spinal cord and brain.
- It's also essential for regulating your cardiovascular(Heart) and respiratory systems.
Question 8
4 / -1

A simple pendulum of length l has a brass bob attached at its lower end. Its period is T. If a steel bob of same size, having density x times that of brass, replaces the brass bob and its length is changed so that period becomes 2T, then new length is

A

B

C

D

Solution

Time period depends only on effective length. Density has no effect on time period. If length made 4 times then time period becomes 2 times.
Question 9
4 / -1

The resistance of 0.01 N solution of an electrolyte was found to be 210 ohm at 298 K, using a conductivity cell of cell constant 0.66 cm⁻¹. The equivalent conductance of the solution is:

A

B

C

D

Solution

Let us consider the specific conductance is given by the equation.
Question 10
4 / -1

A pendulum bob of mass 50 g is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately:

A
0.30 N

B
0.40 N

C
0.42 N

D
0.50 N

Solution

As elevator goes up with uniform velocity then acceleration a = 0.

Then, the tension in the string

T = m (g + a)

T = m g

⇒ T = 5 × 10⁻³× 10

⇒ T = 0.50 N