NEET Test 175

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NEET Test 175

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Weekly Quiz Competition

Question 1
4 / -1

The frequency of tuning forks A and B are respectively 3% more and 2% less than the frequency of tuning fork C. When A and B are simultaneously excited, 5 beats per second are produced. Then the frequency of the tuning fork 'A' (in Hz ) is:

A
98

B
100

C
103

D
105

Solution
Question 2
4 / -1

The diagram below shows the layers of the alimentary canal. Identify the parts labeled 1, 2, 3, and 4 in the given diagram.

A
1-Mucosa, 2-Muscularis, 3-Sub mucosa, 4-Serosa

B
1-Serosa, 2-Mucosa, 3-Sub mucosa, 4-Muscularis

C
1-Serosa, 2-Sub mucosa, 3-Muscularis, 4-Mucosa

D
1-Serosa, 2-Muscularis, 3-Sub mucosa, 4-Mucosa

Solution

The GI tract contains four layers: the innermost layer is the mucosa, underneath this is the submucosa, followed by the muscular propria or Muscularis, and finally, the outermost layer - the Serosa. The structure of these layers varies, in different regions of the digestive system, depending on their function. Therefore all in order are from outermost to innermost layer: 1-Serosa, 2-Muscularis, 3-Sub mucosa, 4-Mucosa
Question 3
4 / -1

Which is the best description of the behaviour of bromine in the reaction given below?

A
Proton acceptor only

B
Both oxidised and reduced

C
Oxidised only

D
Reduced only

Solution

In the above reaction the oxidation number of Br₂ increases from zero (in Br₂ ) to +1 (in HOBr) and decreases from zero (in Br₂ ) to –1 (in HBr). Thus Br₂ is oxidised as well as reduced and hence it is a redox reaction.
Question 4
4 / -1

In ETS, the last electron acceptor is:

A

B
ATP

C
Oxygen

D
Water

Solution

NADH and FADH₂ bring electrons to the ETS. As the electrons move down the system, energy is released and use to form ATP. For every pair of electrons that enters by way of NADH, three ATP results. For every pair of electrons that enters by way of FADH₂ two ATP result. Oxygen, the final acceptor of the electrons, becomes a part of water.
Question 5
4 / -1

Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, the number of atoms of nitrogen in one molecule of caffeine is:

A
4

B
6

C
2

D
3

Solution

Number of nitrogen atoms in caffeine can be calculated by dividing the mass of nitrogen in a molecule of caffeine with the atomic mass of nitrogen.
Question 6
4 / -1

The reaction between acetone and methylmagnesium chloride followed by hydrolysis will give:

A
Isobutyl alcohol

B
Isopropyl alcohol

C
Secondary butyl alcohol

D
Tertiary butyl alcohol

Solution

The reaction between acetone and methylmagnesium chloride followed by hydrolysis will give tertiary butyl alcohol.
Question 7
4 / -1

A magnetising field of 1500Am⁻¹ produces flux of 2.4 × 10⁻⁵ weber in a iron bar of the cross-sectional area of 0.5 cm². The permeability of the iron bar is

A
245

B
250

C
252

D
255

Solution
Question 8
4 / -1

A gas X with a disagreeable odour reduces silver nitrate solution to give metallic silver and is itself oxidised to Y. Y is a dibasic acid with reducing properties. It is slowly oxidised in air to a tribasic acid Z. Though Z is a tribasic acid, it behaves in an aqueous solution mostly as a dibasic acid. When a mixture of X and N₂O is subjected to electric spark, Z is obtained.

A

B

C

D

Solution
Question 9
4 / -1

Which of the following is correct about the blastocyst?

A
Penetrates endometrium from its embryonic pole.

B
Consists of the outer trophoblast and inner embryoblast.

C
Gets implanted along with zona pellucida.

D
Has a cavity called amniotic cavity.

Solution

The blastocyst is a hollow structure that contains a cluster of cells from which embryo arises. The outer layer provides placenta and other essential tissues for fetal development while the inner cells give rise to the tissues of the body. This outer layer is known as trophoblast which provides nutrients to the embryo. Embryoblast is cells which are situated within the trophoblast and result in the production of an embryo.
Question 10
4 / -1

Which one of the following statement is correct?

A
There is no evidence of the existence of gills during embryogenesis of mammals

B
All plants and animals cells are totipotent

C
Ontogeny repeats phylogeny

D
Stem cells are specialized cells

Solution

Recapitulation theory or Biogenetic law states that oncology (development of the embryo) is a recapitulation of phylogeny (ancestral sequence).