NEET Test 154

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NEET Test 154

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Weekly Quiz Competition

Question 1
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 2
4 / -1

Which of the following meristems appears early in the life of a plant and contributes to the formation of the primary plant body?

a. Apical meristem

b. Intercalary meristem

c. Lateral meristem

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

The apical meristem is the growth region in plants found within the root tips and the tips of the new shoots and leaves. Apical meristem is one of three types of meristem, or tissue that can differentiate into different cell types. Meristem is the tissue in which growth occurs in plants.

Intercalary meristem is a type of meristematic tissue associated with the growth in length in the middle position, thus the name. In particular, it is made up of meristematic cells that divide mitotically in the stem at the base of nodes and leaf blades.
Question 3
4 / -1

Directions For Questions

Consider the following statements regarding Biosphere Reserves:

1) The designation Biosphere Reserve for natural areas was introduced by the International Co-ordinating Council of United Nation Environment Programme.

2) Biosphere Reserves are protected areas of land and coastal environments where no human intervention allowed.

...view full instructions

Which of the above statements is/are correct?

A
1 only

B
2 only

C
Both 1 and 2

D
Neither 1 nor 2

Solution

BIOSPHERE RESERVE (BR)

The International Co-ordinating Council (ICC) of UNESCO, November, 1971, introduced the designation ‘Biosphere Reserve’ for natural areas. The concept of Biosphere Reserves was refined by a Task Force of UNESCO’s MAB Programme in 1974, and BR network was formally launched in 1976.

Biosphere Reserve (BR) is an international designation by UNESCO for representative parts of natural and cultural landscapes extending over large area of terrestrial or coastal/marine ecosystems or a combination thereof.

Each Biosphere Reserves are protected areas of land and/or coastal environments wherein people are an integral component of the system. Together, they constitute a worldwide network linked by International understanding for exchange of scientific information.
Question 4
4 / -1

Which of the following pollutants are responsible for the Acid rain:

A
Carbon dioxide and Carbon monoxide

B
Carbon dioxide and Nitrogen

C
Carbon dioxide and Ozone

D
Nitrous oxide and Sulphur dioxide

Solution

The major source of Nitrous oxide and Sulphur Oxide pollution are power plants, Fossil fuel burning, Lightning, Industrial smoke, Chemical and Fertiliser Industries Volcanoes, Seas and Oceans, Decomposition of organic matter and vehicles.

N₂O₃,NO₂ and N₂O₅ are acidic in nature, and when they react with water, they produce acids like HNO₃ (Nitric Acid) and HNO₂ (Nitrous Acid) which causes acid rain.

CO and CO₂ react with rainwater to form weak Carbonic Acid. Thus generally rainwater is naturally slightly acidic.
Question 5
4 / -1

Which of the following statements is true?

A
The first law of thermodynamics is not adequate in predicting the direction of the process.

B
In an exothermic reaction, the total enthalpy of the products is greater than that of reactants.

C
The standard enthalpy of a diamond is zero at 298 𝐾 and 1 𝑎𝑡𝑚 pressure.

D
It is possible to calculate the value of Δ𝐻 for the reaction 𝐻₂(𝑔) + 𝐵𝑟2(ℓ) → 2𝐻𝐵𝑟(𝑔) from the bond enthalpy data.

Solution

The first law of thermodynamics is not adequate in predicting the direction of a process. It is the law of conservation of energy. However, it does not predict whether the process will occur spontaneously and if so, in which direction. For example, the first law of thermodynamics does not indicate whether heat can flow from a colder end to a hotter end or not.
Question 6
4 / -1

Aryl halides are less reactive towards nucleophilic substitution than alkyl halides. Which of the following factors is not responsible for this fact?

A
Formation of more stable carbonium ion

B
Resonance stabilisation

C
Inductive effect

D
sp²-hybridised carbon attached to the halogen

Solution

Aryl halides are less reactive towards nucleophilic substitution reaction as compared to alkyl halides due to resonance stabilization. In alkyl halides, the carbon atom is sp³-hybridized whereas, in aryl halides, it is sp²-hybridized and hence, more electronegative.
Question 7
4 / -1

A compound contains three elements A,B and C, if the oxidation of 𝐴 = + 2,𝐵 = +5 and C = −2, the possible formula of the compound is:

A
A₃(B₄C)₂

B
A₃(BC₄)₂

C
A₂(BC₃)₂

D
ABC₂

Solution

Here compound A₃(BC₄)₂ is possible as in it sum of oxidation numbers is zero as follows:

3 (+2 ) + 2 × 5 + 8(−2) = 0
Question 8
4 / -1

Radioactive material has a half-life of 10 days. What fraction of the material would remain after 30 days?

A
0.5

B
0.25

C
0.125

D
0.33

Solution
Question 9
4 / -1

A wheel with 20 metallic spokes each of length 0.8 𝑚 long is rotated with a speed of 120 revolution per minute in a plane normal to the horizontal component of earth magnetic field 𝐻 at a place. If 𝐻 = 0.4 × 10⁻⁴𝑇 at the place, then induced emf between the axle and the rim of the wheel is

A
2.3 × 10⁻⁴𝑉

B
3.1 × 10⁻⁴𝑉

C
2.9 × 10⁻⁴𝑉

D
1.61 × 10⁻⁴𝑉

Solution
Question 10
4 / -1

Sodium has body-centered packing. The distance between two nearest atoms is 3.7 A^∘. The lattice parameter is:

A
8.6 𝐴^∘

B
6.8 𝐴^∘

C
4.3 𝐴^∘

D
3.0 𝐴^∘

Solution

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NEET Test 154

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NEET Test 154

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SHARING IS CARING

Question 1

1035 𝑛𝑚

325 𝑛𝑚

743 𝑛𝑚

518 𝑛𝑚

Solution

Question 2

Only a

Only a and b

Only b

Only b and c

Solution

Question 3

1 only

2 only

Both 1 and 2

Neither 1 nor 2

Solution

Question 4

Carbon dioxide and Carbon monoxide

Carbon dioxide and Nitrogen

Carbon dioxide and Ozone

Nitrous oxide and Sulphur dioxide

Solution

Question 5

The first law of thermodynamics is not adequate in predicting the direction of the process.

In an exothermic reaction, the total enthalpy of the products is greater than that of reactants.

The standard enthalpy of a diamond is zero at 298 𝐾 and 1 𝑎𝑡𝑚 pressure.

It is possible to calculate the value of Δ𝐻 for the reaction 𝐻2(𝑔) + 𝐵𝑟2(ℓ) → 2𝐻𝐵𝑟(𝑔) from the bond enthalpy data.

Solution

Question 6

Formation of more stable carbonium ion

Resonance stabilisation

Inductive effect

sp2-hybridised carbon attached to the halogen

Solution

Question 7

A3(B4C)2

A3(BC4)2

A2(BC3)2

ABC2

Solution

Question 8

0.5

0.25

0.125

0.33

Solution

Question 9

2.3 × 10−4𝑉

3.1 × 10−4𝑉

2.9 × 10−4𝑉

1.61 × 10−4𝑉

Solution

Question 10

8.6 𝐴∘

6.8 𝐴∘

4.3 𝐴∘

3.0 𝐴∘

Solution

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It is possible to calculate the value of Δ𝐻 for the reaction 𝐻₂(𝑔) + 𝐵𝑟2(ℓ) → 2𝐻𝐵𝑟(𝑔) from the bond enthalpy data.

sp²-hybridised carbon attached to the halogen

A₃(B₄C)₂

A₃(BC₄)₂

A₂(BC₃)₂

ABC₂

2.3 × 10⁻⁴𝑉

3.1 × 10⁻⁴𝑉

2.9 × 10⁻⁴𝑉

1.61 × 10⁻⁴𝑉

8.6 𝐴^∘

6.8 𝐴^∘

4.3 𝐴^∘

3.0 𝐴^∘