NEET Test 122

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NEET Test 122

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Weekly Quiz Competition

Question 1
4 / -1

The type of isomerism shown by the complex

A
Geometrical isomerism

B
Coordination isomerism

C
Linkage isomerism

D
Ionization isomerism

Solution

In the given complex, the CN of Co is 6, and the complex has octahedral geometry.

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

Select the correct sequence of steps in DNA fingerprinting involving southern blot hybridization using VNTR.

i. Hybridisation using labelled VNTR probe

ii. Isolation of DNA

iii. Transferring (blotting) of DNA fragments to synthetic membranes, such as nitrocellulose or nylon

iv. Detection of hybridised DNA fragments by autoradiograph

v. Separation of DNA fragments by electrophoresis

vi. Digestion of DNA by restriction endonucleases

A
i, v, vi, ii, iv and iii

B
vi, v, vi, ii, i and iii

C
ii, v, vi, iii, i and iv

D
ii, vi, v, iii, i and iv

Solution

A Southern blot is a method used in molecular biology for the detection of a specific DNA sequence in DNA samples. Southern blotting combines the transfer of electrophoresis-separated DNA fragments to a filter membrane and subsequent fragment detection by probe hybridization.

The correct sequence will be- ii, vi, v, iii, i, and iv

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

Which of the following plant genera has coralloid root?

A
Cycas

B
Vinca

C
Dahlia

D
Rose

Solution

Cycas or Cycads provide fixed carbon and a stable environment to the cyanobacteria in exchange for fixed nitrogen. These cyanobacteria are endosymbionts, living within the roots of Cycads. Within the coralloid root is the cyanobacterial zone, which is the region inhabited by cyanobacteria.

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

The magnetic field at a distance r from a long wire carrying a current i is 0.4 tesla. The magnetic field at a distance 2r is:

A
0.2 tesla

B
0.8 tesla

C
0.1 tesla

D
1.6 tesla

Solution

When r is doubled, the magnetic field becomes halved.

Now the magnetic field will be 0.2 tesla.

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

The enzyme enterokinase helps in conversion of:

A
Protein into polypeptides

B
Trypsinogen into trypsin

C
Caseinogen into casein

D
Pepsinogen into pepsin

Solution

The enzyme enterokinase helps in conversion of inactive trypsinogen into active trypsin.

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

Diameter of plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 10⁸ m/s, the focal length of the lens is:

A
20 cm

B
10 cm

C
30 cm

D
15 cm

Solution

The lens is as shown in the figure.

Hence, the correct option is (C).
Question 7
4 / -1

An electric pump is used to fill an overhead tank of capacity 9 m³ kept at a height of 10 m above the ground. If the pump takes 5 minute to fill the tank by consuming 10 kW of power, the efficiency of the pump should be (Take g=10 ms⁻² )

A
60%

B
40%

C
30%

D
20%

Solution

Given,

The volume of water to be raised = 9 m³

Since we know that

Density of water = 1000kgm⁻³

So, mass of water to be raised

Mass = 1000 × 9

Mass = 9000 kg

So, the potential energy change for 9000 kg of water to be raised to a height of 10 m above the

ground is given by;

PE = 9000 × 10 × 10

PE = 9 ×10⁵J

Since,
Question 8
4 / -1

The phenomenon of sound propagation in the air is:

A
Isothermal process

B
Isobaric process

C
Adiabatic process

D
None of these

Solution

Sound is a mechanical wave. It requires a medium for transmission. There is no transmission of sound in a vacuum. The transmission of sound in the air is in the form of a longitudinal wave. The transmission of sound in the air is in the form of compression and deceleration caused by the vibration of air particles. So, the phenomenon of sound propagation in the air is also an adiabatic process.

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

An a-particle of energy 5MeV is scattered through 180^∘ by a fixed uranium nucleus. The distance of the closest approach is of the order of

A

B
10^-10 cm

C
10^-12 cm

D
10^-15 cm

Solution

At closest approach, all the kinetic energy of the a-particle will converted into the potential energy of the system, K. E. = P . E
Question 10
4 / -1

Auxin inhibits the growth of:

A
Apical buds

B
Lateral axillary buds

C
Roots on stem cuttings

D
Parthenocarpic development of fruits

Solution

The first discovered plant growth hormone is auxin that plays an important role in the growth and development of plants. The bud which is present on the apex of the stem and root is called apical bud that produces a hormone i.e. auxin that helps in the growth of the shoot tip and root tip but inhibits the growth of the lateral bud. But if the plant is cut then auxin concentration in the plants gets decreased that lead to the development of lateral axillary bud.

Hence, the correct option is (B).