NEET Test 116

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NEET Test 116

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Weekly Quiz Competition

Question 1
4 / -1

A wheel is rotating at the rate of 33 revolution/min. if it comes to a stop in 20 seconds. Then the angular retardation will be

A
0

B

C

D

Solution
Question 2
4 / -1

The compound formed when ethyl bromide is heated with dry silver oxide is:

A
Dimethyl ether

B
Diethyl ether

C
Methyl alcohol

D
Ethyl alcohol

Solution

The main product obtained by heating ethyl bromide in presence of dry silver oxide is Diethyl ether, when ethyl bromide heat in the presence of dry silver oxide then it gives diethyl ether and silver bromide as products.
Question 3
4 / -1

Which one of the following is a matching pair of a body feature and the animal possessing it?

A
Pharyngeal gill slits absent during embryonic development - Chameleon

B
Ventral heart - Scorpion

C
Post-anal tail - Octopus

D
Ventral central nervous system - Leech

Solution

The ventral nerve cord is found in insects and is functionally equivalent to the vertebrate spinal cord. This kind of nervous system is found in leeches and some of the annelids and arthropods. The scorpion possesses a dorsal heart, Post anal tail is usually seen in cobras belonging to the phylum Chordata. Pharyngeal gill slits are found in the embryos of all vertebrates due to their common ancestors, the fish, who were the first one to have these structures.

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

The magnitude of acceleration of a moving body is equal to the:

A
Gradient of a displacement-time graph

B
Gradient of a velocity-time graph

C
Gradient of a displacement-velocity graph

D
Area of a velocity-time graph

Solution

The magnitude of acceleration of a moving body is equal to the gradient of a velocity-time graph.

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

The known sequence of DNA is used to find complementary DNA strand. What is it called?

A
Vector

B
DNA probe

C
Plasmid

D
Recombinant DNA

Solution

DNA probes are stretches of single-stranded DNA used to detect the presence of complementary nucleic acid sequences (target sequences) by hybridization. DNA probes are usually labeled, for example with radioisotopes, epitopes, biotin, or fluorophores to enable their detection.

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

Three faradays of electricity are passed through molten Al₂O₃, aqueous solution of CuSO₄, and molten NaC𝑙 taken in separate electrolytic cells. The amounts of A𝑙,Cu and Na deposited at the cathodes will be in the molar ratio:

A
1 : 2 : 3

B
3 : 2 : 1

C
1 : 1.5 : 3

D
1.5 : 2 : 3

Solution

Given:

Three faradays of electricity are passed through molten Al₂O₃, aqueous solution of CuSO₄, and molten NaCl taken in separate electrolytic cells.
Question 7
4 / -1

The refractive index for a prism is given as Then, the angle of minimum deviation in terms of angle of the prism is :

A
90° - A

B
2A

C
180° - A

D
180° - 2A

Solution
Question 8
4 / -1

The correct order of mobilities of alkali metal ions in an aqueous solution is

A

B

C

D

Solution

Small size cations such as Lithium, sodium are heavily hydrated i.e. more no. of water molecules are surrounded to small cation due to which the hydrated radii of small size cation is large hence to degree of hydration is greater. If the degree of hydration is large, the hydrated cation will move less freely i.e. low ionic mobility in aqueous medium. On going down the group in alkali metals, the ionic mobility increases as less no. of water molecules are surrounded to large cations. Hence, small size cation, high degree of hydration, low ionic mobility. large size cation, low degree of hydration, high ionic mobility.

The order of ionic mobilities of alkali metal ions in aqueous solution are

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

Combustion of hydrogen in a fuel cell at 300KJ is represented as 2H₂( g)+O₂( g) → 2H₂O(g). If ΔH and ΔG are − 241.60KJmol⁻¹ and −228.40KJmol⁻¹ of H₂O respectively, then the value of ΔS for the above process is:

A
4.4 J

B
-88 J

C
+ 88J

D
-44 J

Solution
Question 10
4 / -1

Identify the given structure.

A
Thiosulphuric acid

B
Sulphuric acid

C
Peroxymonosulphuric acid

D
Sulphurous acid

Solution

The given structure is Peroxymonosulphuric acid. The image is shown below:

Peroxymonosulfuric acid, (H₂SO₅), also known as persulfuric acid, peroxysulphuric acid, or Caro's acid. In this acid, the S(VI) center adopts its characteristic tetrahedral geometry; the connectivity is indicated by the formula HO–O–S(O)₂–OH. It is one of the strongest oxidants known (E₀ = +2.51 V) and is highly explosive.

H₂SO₅ is sometimes confused with H₂S₂O₈, known as peroxydisulfuric acid. The disulfuric acid, which appears to be more widely used as its alkali metal salts, has the structure HO–S(O)₂–O–O–S(O)₂–OH.

Hence, the correct option is (C).