NEET Test 94

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NEET Test 94

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following statements is not true about the primary plant growth?

A
Only woody plants show primary growth

B
Primary growth increases the length of the plant

C
The ground meristem is a primary meristem that produces ground tissues

D
The procambium is a primary meristem that produces primary vascular tissues

Solution

Growth in plants occurs as the stems and roots length. Some plants, especially those that are woody, also increase in thickness during their life span. The increase in the length of the shoot and the root is referred to as primary growth. It is the result of cell division in the shoot apical meristem.

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

Vinegar is obtained by double fermentation of starch or sugary material. The first step fermentation is achieved by the addition of Saccharomyces cerevisiae and second step fermentation by the addition of:

A
Acetobacter aceti

B
Lactobacillus lactis

C
Penicillium notatum

D
Escherichia coli

Solution

Vinegar is a liquid consisting mainly of acetic acid (CH₃COOH) and water. The microbial activity, the sugar is fermented by yeasts or Saccharomyces cerevisiae, followed by bacterial oxidation of the ethanol to acetic acid (acetification by Acetobacter aceti).

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

Which structure(s) is/are responsible for cardiac syncytium?

A
T-tubules

B
Intercalated discs

C
Desmosomes

D
Sarcoplasmic reticulum

Solution

Intercalated discs are part of the sarcolemma and contain two structures important in cardiac muscle contraction: gap junctions and desmosomes. A gap junction forms channels between adjacent cardiac muscle fibers that allow the depolarizing current produced by cations to flow from one cardiac muscle cell to the next.

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

Salts of sorbic acid and propionic acid are used as:

A
Antioxidants

B
Flavouring agents

C
Food preservatives

D
Nutritional supplements

Solution

Salts of sorbic acid and propionic acid are used as food preservatives. Sodium and potassium sorbates are used for controlling the growth of yeasts and moulds in several food products such as cheese, baked food, pickles, certain meat and fish products. Similarly, sodium and calcium propionates are used in breads and cakes as mould inhibitor.

Hence, the correct option is (C).
Question 5
4 / -1

From B₂H₆, all the following can be prepared except:

A
B₂O₃

B
H₃BO₃

C
B₂(CH₃)₆

D
NaBH₄

Solution
Question 6
4 / -1

The temperature of the system decreases in the process of:

A
Free process

B
Adiabatic process

C
Isothermal process

D
Isothermal compression

Solution

Adiabatic processes are processes in which the system cannot exchange energy with the surroundings, so there is ΔQ=0 for them.

So from the first law of thermodynamics,

ΔQ =dU+ΔW

0=dU+ΔW

Or dU= −ΔW = −PdV

That is, the work done by the system in the adiabatic process reduces its internal energy, which decreases the temperature of the system.

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

What is not applicable to ozone?

A
It is a bent molecule with bond angle approximately 117^o

B
It has four lone pairs of electrons in one of its Lewis formula

C
The two O − O bond lengths are equal

D
It is an allotrope of oxygen.

Solution

Ozone is an allotrope of oxygen and it is a bent molecule with bond angle approximately 117^∘. it is having 6 lone pairs. In it O − O bond length are equal due to resonance.

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

The compound that will react most readily with gaseous bromine has the formula:

A
C₃H₆

B
C₂H₂

C
C₄H₁₀

D
C₂H₄

Solution

The compound that will react most readily with gaseous bromine has the formula C₃H₆.

Unsymmetrical alkenes generally are more reactive than the symmetrical alkenes, alkynes and alkanes. That is why, propene is more reactive than the other given compounds.

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

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at:

A
1035 nm

B
325 nm

C
743 nm

D
518 nm

Solution
Question 10
4 / -1

Two long straight conductors AOB and COD are perpendicular to each other and carry currents i₁ and i₂. The magnitude of the magnetic induction at a point P at a distance a from the point O in a direction perpendicular to the plane ABCD is :

A

B

C

D

Solution

Conductors AOB and COD are perpendicular to each other shown in figure.