NEET Test 143

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NEET Test 143

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Weekly Quiz Competition

Question 1
4 / -1

Electrons in a certain energy level (n = n₁) can emit 3 spectral lines. When they are in another energy level, n = n₂, they can emit 6 spectral lines. The orbital speeds of the electrons are in the ratio:

A
4 : 3

B
3 : 4

C
2 : 1

D
1 : 2

Solution
Question 2
4 / -1

If the ratio of the coordination number of A to that of B is x : y, then the ratio of a number of atoms of A to that of B in the unit cell is:

A
x : y

B
y : x

C
x² : y

D
y² : x

Solution

The coordination number of A = Number of atoms of B

The coordination number of B = Number of atoms of A

So, The Formula is A_yB_xand the ratio of the number of atoms is y : x
Question 3
4 / -1

Which of the following occur at the same trophic level?

A
Deer and Bee

B
Cow and Crow

C
Earthworm and Frog

D
Snake and Vulture

Solution

The step or position in a nutritive series like food chain is referred to as trophic level.

There are different trophic levels in an ecosystem and food chain. The producers (photosynthetic organisms) form the first trophic level and consumers take up the successive trophic levels.

The plants or producers take up the primary trophic level. The animals that consume plant/producers take up the secondary trophic levels like deer, cow, bee, earthworm. Animals feeding on the animals of secondary trophic level are considered tertiary trophic level. Snake, frog, crow.
Question 4
4 / -1

Which of the following statements is false regarding ozone?

1. Ozone is less stable than dioxygen.

2. Ozone is paramagnetic.

3. Ozone is violet-black in solid-state.

4. Ozone molecule is linear.

A
Both 1 and 2

B
Both 1 and 4

C
Both 2 and 3

D
Both 2 and 4

Solution

Ozone (O₃), or trioxygen, is a triatomic molecule consisting of three oxygen atoms. Ozone is diamagnetic, which means that its electrons are all paired.

Ozone, O is not a linear molecule. Actually, it is bent with an angle that is a little less than 120°. Ozone has fewer lone pairs than water, thus a larger angle between bonds.
Question 5
4 / -1

Which of the following statement is incorrect regarding Yoghurt?

A
It is a fermented milk

B
Mixed with an inoculum containing Streptococcus faecalis

C
Preparation takes approximately 4-5 hours

D
The original flavour of yoghurt is of acetaldehyde

Solution

Yoghurt is fermented milk. The milk is heated to 80-90°C for half an hour and then it is cooled to 40-43°C and mixed with an inoculum containing Streptococcus thermophilus and Lactobacillus bulgaricus. Preparation of yoghurt takes approximately 4-5 hours. The original flavour of yoghurt and other fermented kinds of milk is of acetaldehyde.
Question 6
4 / -1

In which of the following ecosystems, inverted pyramid of biomass can be observed?

A
Marine

B
Tundra

C
Forest

D
Grass land

Solution

In marine ecosystems, inverted pyramid of biomass can be observed.

When the relationship between producers and consumers in an ecosystem can be represented in the form of a pyramid in terms of biomass, it is called a pyramid of biomass.

It is of two types:

Upright: The amount of biomass in each trophic level decreases as we move from producers to decomposers. Eg. Grassland ecosystem

Inverted: The amount of biomass in each trophic level increases as we move from producers to decomposers. Eg. In a Marine ecosystem like a pond producers (phytoplankton) have lesser biomass compared to consumers (Fishes).
Question 7
4 / -1

A body floats in a liquid contained in a beaker. If the whole system falls under gravity, them the upthrust on the body due to liquids is:

A
Equal to the weight of the body in air

B
Equal to the weight of the body in liquid

C
Zero

D
Equal to the weight of the immersed part of the body

Solution

Upthrust is independent of all factors of the body such as its mass, size, density, etc, except the volume of the body inside the fluid. Fraction of volume immersed in the liquid it depends upon the densities of the block and liquid.

So, there will be no change in it if the system moves upward or downward with constant velocity or some acceleration. Therefore, the upthrust on the body due to liquid is equal to the weight of the body in the air.
Question 8
4 / -1

The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and a circular ring of the same radius about a tangential axis in the plane of the ring is:

A
2 : 3

B
2 : 1

C

D
1 : √2

Solution
Question 9
4 / -1

Which of these is secondary pollutant?

A
CO₂

B
SO₂

C
O₃

D
None of these

Solution

O₃ is a secondary pollutant whereas CO₂ and SO₂ are primary pollutants.

Secondary pollutants are not emitted directly. They are formed from the combination of primary pollutants with some other compound. Examples of secondary pollutants are Ozone, Formaldehyde, PAN (peroxy acetyl nitrate) and Smog etc.
Question 10
4 / -1

Which statement regarding coenzyme is incorrect?

A
Every cofactor is a coenzyme and every coenzyme is a cofactor

B
Every coenzyme is a cofactor but every cofactor is not a coenzyme

C
Most of the coenzymes are nucleotides and are composed of vitamins

D
Coenzymes are the active constituents of enzymes

Solution

Every coenzyme is a cofactor but every cofactor is not coenzyme. Cofactors can be classified depending on how tightly they bind to an enzyme, with loosely bound cofactors termed coenzymes and tightly bound cofactors termed prosthetic groups.

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Re-Attempt Weekly Quiz Competition

NEET Test 143

Result

NEET Test 143

Score

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Rank

-

SHARING IS CARING

Question 1

4 : 3

3 : 4

2 : 1

1 : 2

Solution

Question 2

x : y

y : x

x2 : y

y2 : x

Solution

Question 3

Deer and Bee

Cow and Crow

Earthworm and Frog

Snake and Vulture

Solution

Question 4

Both 1 and 2

Both 1 and 4

Both 2 and 3

Both 2 and 4

Solution

Question 5

It is a fermented milk

Mixed with an inoculum containing Streptococcus faecalis

Preparation takes approximately 4-5 hours

The original flavour of yoghurt is of acetaldehyde

Solution

Question 6

Marine

Tundra

Forest

Grass land

Solution

Question 7

Equal to the weight of the body in air

Equal to the weight of the body in liquid

Zero

Equal to the weight of the immersed part of the body

Solution

Question 8

2 : 3

2 : 1

1 : √2

Solution

Question 9

CO2

SO2

O3

None of these

Solution

Question 10

Every cofactor is a coenzyme and every coenzyme is a cofactor

Every coenzyme is a cofactor but every cofactor is not a coenzyme

Most of the coenzymes are nucleotides and are composed of vitamins

Coenzymes are the active constituents of enzymes

Solution

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x² : y

y² : x

CO₂

SO₂

O₃