NEET Test 89

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NEET Test 89

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Weekly Quiz Competition

Question 1
4 / -1

Opening of flower and drooping of a bud are:

A
Hyponasty

B
Epinasty

C
Curvature movement

D
Spontaneous movements

Solution

Nastic movements are non-directional movements in which the direction of response or movement is determined by the epinasty (greater growth on the adaxial side, e.g., the opening of flowers), hyponasty (greater growth on abaxial side e.g., closing of flowers), thigmotactic or chemonastic bending of tentacles in Drosera. Thermonastic movements occur in the opening and drooping of Tulip and Crocus flowers. In epinasty opening of fern leaf and spreading of sepal and petals during the opening of the floral bud.

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

At the centre of a cubical box +Q charge is placed. The value of total

flux that is coming out of each face is:

A
Q / ϵ₀

B
Q / 6ϵ₀

C
Q / 4ϵ₀

D
ϵ₀Q

Solution

Given:

Charge on cubical box (qin ) = Q

The Gaussian law is given as,

f = Q / ϵ₀

Where f is the total electric flux, Q is the charge enclosed by the surface and ∈0 is the permittivity of the free space.

It is given that the charge of +Q is placed at the centre of the box. The Gauss's law provides the information about the distribution of the electric charges for the closed surface. In the closed surface, the electric flux is directly proportional to the electric charges enclosed in the surface.

The cubical surface encloses the charge +Q. Since the cube is the closed surface with the six faces, the gauss law can be applied to find the electric flux of it.

By using the formula of the Gaussian law,

f = Q/ϵ₀

Since the cube contains the six faces, the permittivity of the free space is multiplied by six

to find the flux from each face.

f = Q/6∈0

So, the electric flux that is coming out of each flux is obtained as Q/6∈₀

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

The conversion of atomic hydrogen into ordinary hydrogen is:

A
An exothermic change

B
An endothermic change

C
Used in oxyhydrogen torch

D
Both (A) and (C)

Solution

The conversion of atomic hydrogen into ordinary hydrogen is an exothermic reaction. Since atomic hydrogen is highly unstable, it readily combines with another hydrogen atom to form a stable hydrogen molecule.

2H (atomic) →H₂ (g)

It is an exothermic reaction since the heat is released during bond formation. Oxyhydrogen is a mixture of hydrogen and oxygen gases.

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

The values of the currents i₁ and i₂ flowing through the resistors R₁(= 10Ω) and R₂( = 30Ω) respectively, in the circuit diagram with E₁=3V,E₂ =3V and E₃=2V, are:

A
0.2A,0.1A

B
0.4A,0.2A

C
0.1A,0.2A

D
0.2A,0.4A

Solution
Question 5
4 / -1

In a Rutherford scattering experiment, when a projectile of charge z₁ and mass M₁ approaches a target nucleus of charge z₂ and mass M₂, the distance of the closest approach is r₀. The energy of the projectile is:

A
Directly proportional to z₁z₂

B
Inversely proportional to z₁

C
Directly proportional to mass M₁

D
Directly proportional to mass M₁× M₂

Solution

According to Rutherford scattering experiment, the energy of the projectile is equal to the potential energy at the closest approach.

KE = 1/4πε₀ z₁z₂/r₀

Therefore, energy ∝ z₁z₂.

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

The colour of KMnO₄ is due to:

A
M → L charge transfer transition

B
d − d transition

C
L → M charge transfer transition

D

Solution

In MnO₄, Mn has +7 oxidation state having no electron in d- orbitals.

It is considered that the higher the oxidation state of the metal, the greater is the tendency to occur L → M charge transfer because ligand is able to donate the electrons into the vacant d- orbital of metal. Since charge transfer is Laporte as well as spin allowed, therefore, it shows color.

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

In a genetic code, some codons do not code for amino acids that function as stop codons. Which of the following does not belong to this group?

A
UAG

B
UAA

C
UUU

D
None of these

Solution

The genetic code is a set of three-letter combinations of nucleotides called codons, each of which corresponds to a specific amino acid or stop signal. They showed that the RNA sequence UUU specifically coded for the amino acid phenylalanine.

Hence, the correct option is (C).
Question 8
4 / -1

A pure inductor of 25.0mH is connected to a source of 220 V. Find the inductive reactance and rms current in the circuit if the frequency of the source is 50 Hz.

A
28 A

B
27 A

C
33 A

D
41 A

Solution
Question 9
4 / -1

The number of moles of KMnO₄ that will be needed to react with one mole of sulphite ion in acidic solution is:

A
2/5

B
3/5

C
4/5

D
1

Solution
Question 10
4 / -1

Some dividing cells exit the cell cycle and enter the vegetative inactive stage. This is called the quiescent stage (G₀). This process occurs at the end of:

A
M phase

B
G₁ phase

C
S phase

D
G₂ phase

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Re-Attempt Weekly Quiz Competition

NEET Test 89

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NEET Test 89

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SHARING IS CARING

Question 1

Hyponasty

Epinasty

Curvature movement

Spontaneous movements

Solution

Question 2

Q / ϵ0

Q / 6ϵ0

Q / 4ϵ0

ϵ0Q

Solution

Question 3

An exothermic change

An endothermic change

Used in oxyhydrogen torch

Both (A) and (C)

Solution

Question 4

0.2A,0.1A

0.4A,0.2A

0.1A,0.2A

0.2A,0.4A

Solution

Question 5

Directly proportional to z1z2

Inversely proportional to z1

Directly proportional to mass M1

Directly proportional to mass M1 × M2

Solution

Question 6

M → L charge transfer transition

d − d transition

L → M charge transfer transition

Solution

Question 7

UAG

UAA

UUU

None of these

Solution

Question 8

28 A

27 A

33 A

41 A

Solution

Question 9

2/5

3/5

4/5

1

Solution

Question 10

M phase

G1 phase

S phase

G2 phase

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Q / ϵ₀

Q / 6ϵ₀

Q / 4ϵ₀

ϵ₀Q

Directly proportional to z₁z₂

Inversely proportional to z₁

Directly proportional to mass M₁

Directly proportional to mass M₁× M₂

G₁ phase

G₂ phase