NEET Test 144

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NEET Test 144

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Weekly Quiz Competition

Question 1
4 / -1

The composition of Sorels cement is:

A

B

C

D

Solution

Mixture of MgCl₂ and MgO is called Sorels cement. It is MgCl₂× 5MgO × (xH₂O).

Sorel cement is a mixture of magnesium oxide (burnt magnesia) with magnesium chloride with the approximate chemical formula Mg₄Cl₂(OH)₆(H₂O)₈, or MgCl₂⋅ 3Mg(OH)₂⋅ 8H₂O, corresponding to a weight ratio of 2.5 − 3.5 parts MgO to one part MgCl₂
Question 2
4 / -1

On reduction with hydrogen, 3.6 g of an oxide of metal left 3.2 g of the metal. If the atomic weight of the metal is 64 g, the simplest formula of the oxide would be:

A
M₂O₃

B
M₂O

C
MO

D
MO₂

Solution
Question 3
4 / -1

Which one of the following pairs is wrongly matched?

A
Nitrosomonas: Nitrifying and chemo lithotrophic bacteria.

B
Rhodospirillum: Nitrogen fixation bacteria and Photo-organotrophs bacteria.

C
E.coli: used in genetic engineering and pollution indicating bacteria.

D
Pseudomonas: responsible for food poisoning and purity of Ganga water.

Solution

Pseudomonas are responsible for removing oil contamination. They act as bioremediation organisms. These organisms enhance plant growth promotion and reduce the severity of various diseases.
Question 4
4 / -1

Which of the following is a leafy liverwort?

A
Porella

B
Riccia

C
Marchantia

D
Selaginella

Solution

Porella is a large, common, and widespread genus of liverworts in order Porellales. It is a member of the family Porellaceae within that order.

Porella the only genus of the family Porellaceae, grows in temperate and tropical regions, mainly in the hills. A total of 184 species have been identified. They grow in moist, shady places, on the bark of trees, rocks, etc.
Question 5
4 / -1

H₂O₂ changes Cr₂O₇^2- ion to CrO₅ in an acidic medium, the oxidation state of Cr in CrO₅ is

A
+6

B
+5

C
+10

D
+3

Solution

When H₂O₂ is added to an acidified solution of a dichromate, Cr₂O₇^2-, aO deep blue coloured complex, chromic peroxide, CrO₅ or CrO(O₂)₂ is formed.

Cr₂O₇^2-+2H⁺+4H₂O--->2CrO(O₂)₂+5H₂O

This deep blue coloured complex.

The oxidation state of Cr is +6 due to the presence of two peroxide linkages which can be calculated as Cr peroxide normal

X+(-1)4+(-2)= 0

X-6= 0

X= +6
Question 6
4 / -1

What is a megasporangium?

A
Pistil

B
Carpel

C
Ovule

D
Stigma

Solution

An ovule is an integumented megasporangium found in spermatophytes which develops into a seed on fertilization. The cells within the megasporangium are diploid which will divide via meiosis to form 4 megaspores.

Megasporangium is the structure of a plant body which contains female reproductive organs. It can be called an ovule. It consists of a nucellus and an integument. The ovule can be formed in different size and shapes.
Question 7
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 8
4 / -1

Which of the following statements are true?

(A) Sucrose is a non-reducing sugar.

(B) Glucose is oxidized by bromine water.

(C) Glucose rotates plane polarised light in a clockwise direction.

(D) Fructose is oxidized by bromine water.

A
(A), (B) and (C)

B
(A) and (B)

C
(B) and (C)

D
(B) and (A)

Solution

Sucrose is a non-reducing sugar because the two monosaccharide units are held together by a glycosidic linkage between C₁ of α-glucose and C₂ of β-fructose.

Glucose undergoes an oxidation reaction to give gluconic acid in the presence of bromine water solution. Bromine water is a mild oxidizing agent that selectively oxidizes aldehyde to carboxylic acid only.

Natural glucose is dextro-rotatory (clockwise) and this glucose is also known as dextrose. Thus, it rotates the plane-polarized light to the right.

Bromine water is not capable of oxidizing fructose (ketone).
Question 9
4 / -1

Which of the following is not a transducer?

A
Loudspeaker

B
Microphone

C
Amplifier

D
All of these

Solution

Transducer is a device used for converting one form of energy into another. Therefore, the term transducer is applied to gramophone pickups, microphones and loudspeakers but not for the amplifier.
Question 10
4 / -1

Equilibrium constant for two complexes are

A
A and B are equally stable

B
A is more stable than B

C
B is more stable than A

D
The predictable stability

Solution

Here, K₃[Fe(CN)₆] with dissociation constant 1.9×10¹⁷ is more stable than K₄[Fe(CN)₆] with dissociation constant 2.6 × 10³⁷.

Higher is the dissociation constant lesser will be the stability of complex. So B is more stable than A.