NEET Test 104

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NEET Test 104

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Weekly Quiz Competition

Question 1
4 / -1

Casparian strip occurs in:

A
Pericycle

B
Endodermis

C
Epidermis

D
Cortex

Solution

The innermost layer of cortex forms endodermis, which has compactly arranged barrel shaped cells. The primary thin walled endodermis shows suberin deposition in form of bands or strips that run around the radial and end walls of the cells and forms Casparian strips.

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

In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 Hz, the original frequency of B will be:

A
523 Hz

B
524 Hz

C
536 Hz

D
537 Hz
Question 3
4 / -1

The increasing order of basicity of the following compounds is:

A
(b) < (a) < (c) < (d)

B
(b) < (a) < (d) < (c)

C
(d) < (b) < (a) < (c)

D
(a) < (b) < (c) < (d)

Solution

Order of base nature depends on electron donation tendency.

In compound nitrogen is sp2 hybridized so least basic among all given compounds. the compound is very strong nitrogenous organic base as lone pair of one nitrogen delocalize in resonance and make another nitrogen negatively charged and conjugate acid have two equivalent resonating structure.

Thus it is most basic in given compounds.

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

The ion that is isoelectronic with CO is:

A

B

C
CN⁻

D

Solution

Isoelectronic species refers to the species which have same number of electrons.

In CN⁻, Carbon has six electrons and nitrogen has seven electrons and -1 as charge indicates one electron is gained, so total number of electrons are 6 + 7 + 1 = 14.

As, total number of electrons in CO and CN⁻are 14, so the ion that is isoelectronic with CO is CN⁻.

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

Mark the correct statement:

A
All mammals have placenta

B
All Chondrichthyes are marine animals with a streamlined body with some exceptions

C
Larva of all cyclostomes return to freshwater after metamorphosis

D
Chelone and Testudo are able to maintain a constant body temperature

Solution

Carotenoids are the plant pigments that are responsible for imparting bright red, yellow, and orange colors in the plants. These are water-insoluble pigments, unsaturated molecules built up of isoprene units, and are related to phytol structurally.

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

A feather is dropped on the moon from a height of 1.40 meters. The acceleration due to gravity on the moon is 1.67 m/s². Determine the time for the feather to fall to the surface of the moon. (in s):

A
1.2

B
1.9

C
0.29

D
1.29

Solution
Question 7
4 / -1

Which of the following fluids is used in the technique to find out chromosomal abnormalities?

A
Salivary fluid

B
Bile juice

C
Gastric juice

D
Amniotic fluid

Solution

Amniocentesis (also referred to as an amniotic fluid test or, informally, an "amnio") is a medical procedure used primarily in prenatal diagnosis of chromosomal abnormalities and fetal infections as well as for sex determination.

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

The appearance of colour in solid alkali metal halides is generally due to

A
Schottky defect

B
Frenkel defect

C
Interstitial position

D
F-centres

Solution

In F-centre defect in which an anionic vacancy in a crystal is filled by one or more unpaired electron. These electrons absorb light in the visible region and emit colour. So, appearance of colour in solid alkali metal halides is generally due to F-centre.

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

The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is

A
802 nm

B
823 nm

C
1882 nm

D
1648 nm

Solution

The series in the UV region is the Lyman series. The longest wavelength corresponds to minimum energy which occurs in the transition from n = 2 to n = 1.

The smallest wavelength in the infrared region corresponds to a maximum energy of the Paschen series

Solving equation (i) and (ii), we get

λ = 823.5 nm

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

A series LCR circuit containing 5.0H inductor, 80 μF capacitor and 40Ω resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:

A
42 rad/s, and 58 rad/s

B
25 rad/s, and 75 rad/s

C
50 rad/s, and 25 rad/s

D
46 rad/s, and 54 rad/s

Solution