NEET Test 90

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NEET Test 90

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Weekly Quiz Competition

Question 1
4 / -1

Which type of organism is tolerant to a wide range of salinity?

A
Stenothermal

B
Eurythermal

C
Stenohaline

D
Euryhaline

Solution

Organisms that can tolerate a wide range of salt concentrations are termed Euryhaline organisms are able to tolerate a wide range of salt concentrations (or salinities). For E.g. Poecilia sphenops is a fish that can live in freshwater, brackish water or saltwater.

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

Choose the correct statement about the transmission of impulses:

A
At electrical synapses, the membranes of pre-and post-synaptic neurons are situated far from each other.

B
The synaptic vessels fuse with the plasma membrane and release their neurotransmitters in the synaptic cleft.

C
The released neurotransmitters bind to their specific receptors, present on the presynaptic membrane.

D
Impulse transmission across a chemical aynapse is always faster than that across an electrical synapse.

Solution

At electrical synapses, the membranes of pre-and post-synaptic neurons are in very close proximity. Electrical current can flow directly from one neuron into the other across these synapses. Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.

The axon terminals contain vesicles filled with these neurotransmitters. When an impulse (action potential) arrives at the axon terminal, it stimulates the movement of the synaptic vesicles towards the membrane where they fuse with the plasma membrane and release their neurotransmitters in the synaptic cleft. The released neurotransmitters bind to their specific receptors, present on the postsynaptic membrane.

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

If a carrier wave of 1 kHz is used to a carry signal, the wavelength of transmitting signal is

A
300 km

B
30 km

C
3 km

D
75 km

Solution

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

On electrolysis of dilute sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be:

A
Hydrogen gas

B
Oxygen gas

C
H₂S gas

D
SO₂ gas
Question 5
4 / -1

In the reaction sequence

[X] and [Y] will respectively be :

A

B

C

D

Solution

Here sodium benzoate is formed as the product Y as shown in the below given reaction:

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

A domain in ferromagnetic iron is in the form of a cube of side length 1μm. Estimate the number of iron atoms in the domain and the maximum possible dipole moment and magnetisation of the domain. The molecular mass of iron is 55 g/mole and its density is 7.9 g/cm³. Assume that each iron atom has a dipole moment of 9.27×10⁻²⁴ A m²:

A
7.0 × 10⁵ Am^-1

B
7.0 × 10³ Am^-1

C
6.0 × 10⁴ Am^-1

D
8.0 × 10⁵ Am^-1

Solution

The volume of the cubic domain is:

It is given that Avagadro number (6.023 × 10²³) of iron atoms have a mass of 55 g. Hence, the number of atoms in the domain is

The maximum possible dipole moment m_max is achieved for the (unrealistic) case when all the atomic moments are perfectly aligned.

Thus,
Question 7
4 / -1

The volume of 2.8 g of carbon monoxide at 27^∘C and 0.0821 atm is:

A
30 L

B
3 L

C
0.3 L

D
1.5 L

Solution

According to the ideal gas equation,

We have,
Question 8
4 / -1

What is the maximum concentration of equimolar solutions of ferrous sulphate and sodium sulphide so that when mixed in equal volumes, there is no precipitation of iron sulphide? (For iron sulphide, K_sp = 6.3 × 10⁻¹⁸).

A
4 × 10⁻⁹M

B
4.8 × 10⁻¹¹M

C
5.02 × 10⁻⁹M

D
6 × 10⁻⁹M

Solution

Let the maximum concentration of each solution be x mol/L. After mixing, the volume of the concentrations of each solution will be reduced to half i.e x/2
Question 9
4 / -1

If a force is applied to an elastic wire of the material of Poisson's ratio 0.2 there is a decrease of the cross-sectional area by 1%. The percentage increase in its length is:

A
1%

B
5%

C
2.5%

D
1.5%

Solution
Question 10
4 / -1

Which of the following amines would undergo diazotization?

A
Primary aliphatic amines

B
Primary aromatic amines

C
Both (A) and (B)

D
None of these

Solution

The chemical process used in converting a primary aromatic amine into the corresponding diazonium salt of the amine is commonly referred to as diazotization.

Hence, the correct option is (B).