NEET Test 112

Result

NEET Test 112

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Weekly Quiz Competition

Question 1
4 / -1

Variety of forms in the ecosystem due to diversity of niches, trophic levels and ecological processes is called

A
α-diversity

B
β-diversity

C
γ-diversity

D
Ecosystem diversity

Solution

Ecosystem diversity deals with the variations in ecosystems within a geographical location and their overall impact on human existence and the environment. Ecological diversity is a type of biodiversity. It is the variation in the ecosystems found in a region or the variation in ecosystems over the whole planet.

Hence, the correct option is (D).
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

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

Observe the diagram and identify the labelled parts.

A

B

C

D

Solution

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

C₃ plants show saturation at about which of the following concentrations of CO₂?

A
360 μlL^-1

B
400 μlL^-1

C
450 μlL^-1

D
None of the above

Solution

An increase in CO₂ concentration of up to 0.05 percent can cause an increase in CO₂ fixation rates, beyond this, the levels can become damaging over longer periods.

C₄ plants show saturation at about 360 μlL^-1 while C₃ responds to increased CO₂concentration and saturation is seen only beyond 450 μlL^-1.

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

A

B

C

D

Solution
Question 6
4 / -1

A point source of light is kept at a distance of 15 cm from a converging lens, on its optical axis. The focal length of the lens is 10 cm and its diameter is 3 cm. A screen is placed on the other side of the lens, perpendicular to the axis of the lens, at a distance 20 cm. from it. Then find the area of the illuminated part of the screen?

A
π/4 cm²

B
π/6 cm²

C
π/2 cm²

D
π/3 cm²

Solution
Question 7
4 / -1

A person holds a bucket by applying a 10n force. He then moves a horizontal distance of 5m and climbs up a vertical distance of 10m. Find out the total work done by him?

A
100 J

B
150 J

C
50 J

D
200 J

Solution
Question 8
4 / -1

Which of the following compound on heating does not produce metal oxide?

A

B

C

D

Solution
Question 9
4 / -1

Which of the following options is wrong?

A
Pollen grains remain viable for several months because their outer covering is made of sporopollenin. The exine is composed of sporopollenin, which is derived from carotenoids by oxidative polymerization.

B
No enzyme can degrade sporopollenin.

C
Pollen grains are well represented in fossil strata due to sporopollenin.

D
Pollen wall has cavities containing proteins.

Solution

Pollen wall comprises two principal layers, the inner intine, and outer exine. The intine is pectocellulosic in nature. A special feature of intine is the presence of beads, ribbons, or plates of enzymatic proteins particularly in the vicinity of germ pores. The exine is composed of sporopollenin which is derived from carotenoids by oxidative polymerization. it is resistant to physical and biological decomposition. Due to this, pollen walls are often preserved for long periods in fossil deposits.

Hence, the correct option is (D).
Question 10
4 / -1

In which of the following test tubes rusting of iron can take place?

A
a and d

B
a, b and d

C
b and c

D
b, c and d

Solution

Rusting of iron can take place in test tubes a and d.

Rusting of iron takes place only in the presence of oxygen and water vapours.

In figure a: rust can be formed as the air contains moisture and oxygen.

In figure b: Requirements for rusting at normal temperatures are, liquid water and oxygen.Boiling the water removes dissolved gases, oxygen included, therefore rust does not form.

In figure c: rusting is not possible as the supply of oxygen is blocked by the oil layer.

In figure d: rusting is possible as the tap water contains oxygen and moisture both.

Therefore, only a and d are correct.

Hence, the correct option is (A).