NEET Mock Test - 10 - NEET MCQ

Average velocity and instantaneous velocities have same value in a uniform motion. Average velocity is that uniform velocity with which the object will cover the same displacement in same interval of time as it does with its actual variable velocity during that time interval.

Here, total distance covered

= (3 m/s × 20 s) + (4 m/s × 20 s) + (5 m/s × 20 s)

= (60 + 80 + 100) = 240 m

Total time taken = 20 + 20 + 20

= 60 s

∴ Average velocity = 240/60 = 4m/s

∴

As

∴

Magnetic field at any point due to the straight wire is inversely proportional to the distance from the wire.

Magnetic field at a distance 2r from the wire is B'.

Mobility of free electron depend upon relaxation time

50 x 3 = Rs (28 - 3)

= 6 Ω

Step 1: Find the dimensions of each quantity.

Dimensions of gravitational constant, [G] = [M^-1L³T^-2]

Dimensions of gravitational potential energy, [U] = [ML²T^-2]

Dimensions of gravitational potential, [U] = [L²T^-2]

Dimensions of gravitational intensity, [I] = [LT^-2]

The order of preference is as follows: benzyl > allyl > tertiary > primary > secondary > primary > alkyl halides.

Moreover, SN¹ reaction is favoured over SN² by heavy groups on the carbon atom attached to halogen due to steric hindrance.

Since benzyl carbocation is resonance stabilised, nucleophilic substitution of Benzyl chloride invariably proceeds through SN¹.

(Stability ∞ extent of delocalization)

In ICl₃, there are three bond pairs and two lone pairs, which are arranged in trigonal bipyramidal geometry.

It is T-shaped. Two of the bond pairs occupy axial positions and the third one occupies equatorial position.

The two lone pairs, therefore, are arranged at equatorial positions by making an angle of 120° with each other.

Hence, the equivalent conductance of the solution is 314.29 Scm²eq⁻¹ or 314.29 mho cm²eq⁻¹.

• Megatherms: Plants growing in high temperature throughout the year, e.g. tropical rainforest.

• Mesotherms: Plants growing in alternate high and low temperature, e.g. deciduous tropical forest

• Microtherms: Plants growing in low temperature, e.g. coniferous forest

• Hekistotherms: Plant growing in very low temperature, e.g. alpine vegetation

2 and 3

Explanation:

Statement 1 is correct. Geitonogamy is the pollination of a flower by the pollen from another flower of the same plant. This type of pollination occurs within the same plant, often by the same pollinator, and can lead to self-fertilization if the plant is self-compatible.

Statement 2 is incorrect. Interfascicular cambium is developed from the cells of parenchyma located between the vascular bundles, not from the cells of the medullary ray. The medullary rays are radial bands of parenchyma cells that extend from the pith to the periphery of the stem, while the interfascicular cambium is responsible for the formation of secondary vascular tissues.

Statement 3 is incorrect. The age of a tree cannot be estimated by the diameter of its bark. Instead, the age of a tree is typically estimated by counting the annual growth rings in its trunk. Growth rings are formed as the tree grows and adds new layers of wood each year, and counting these rings can give an accurate estimate of the tree's age.

Statement 4 is correct. Lenticels are small, corky pores found in the bark of woody plants, and they are involved in gas exchange, including transpiration. Transpiration is the process by which plants lose water in the form of water vapor through their leaves, stems, and other aerial parts, and lenticels play a role in this process

RNA polymerase I — 28, 5.8, 18S rRNA

• Mature follicles are known as graafian follicles which occupy a single cavity called antrum and contain a secondary oocyte ready for ovulation.

• Ruptured graafian follicle is called corpus luteum (a temporary endocrine gland which secretes progesterone hormone for the maintenance of pregnancy).

• Corpus luteum loses its yellow colour and becomes inactive, and is transformed into a small cell mass called corpus albicans.

• Degenerated follicles are called atretic follicles.