NEET Unit Test - 5 - NEET MCQ

ω=1/√LC
ω=1√0.09x25
ω=0.666
ω=2πf
f=0.666/(2 x 3.14)
f=0.106 s^-1

Correct Answer :- C

Explanation : Magnetic Moment = Magnetization × Volume

Side of cube = 20 cm

= 0.2 m

= 500 × 0.2 × 0.2 × 0.2

= 4Am²

It is also called the Coefficient of induction. Coefficient of induction is about the ratio of current induced with respect to magnetic flux. This constant of proportionality is known as Inductance. It is a scalar quantity.
The dimension of inductance- M¹·L²·T⁻²·A⁻²

In electromagnetic waves the ratio of amplitudes of electric field and magnetic field is equal to the velocity of the electromagnetic waves in free space.

(E₀ / B₀) = c

Let’s keep this simple and to the point. We know that:
1.in a series circuit the same current flows through each component
2.the voltage across an ideal inductor L is 90˚ ahead of an AC current through it
3.the voltage across an ideal capacitor C is 90˚ behind an AC current through it
So putting these facts together we can conclude that given an AC series current the voltages across any L and C must have a phase difference of 180˚

Increasing order of ligand field strength
l^- < Br^- < SCN^- < CI^- < S^2- < F^- < OH^-< H₂O < NCS^- < edta^4- < NH₃ < en < CN^- < CO

[Co(NH₃)₆]³⁺ : For this complex action the 6 valance electrons of cobalt will occupy the 3d orbital, whereas the 6 ligands will occupy 3d,4s and 4p orbitals in d²sp³ hybridisation.

[Co(H₂O)₆]³⁺ : This intermixing is based on quantum mechanics. Transition metals may exhibit d²sp³ hybridization where the d orbitals are from the 3d and the s and p orbitals are the 4s and 3d. it acts as strong ligand when metal ion is in +3 oxidation for metals cobalt.

CFSE for [CoCI₄]^2- will be 
i.e.  = 8000cm^-1

The correct answer is option B

We know that white light is composed of many different colours. When white light is allowed to fall on [Ti(H₂O)₆]³⁺ ion, this ion absorbs the light of green and yellow colour and transmits is almost purple colour.The purple colour of the transmitted light is called complimentary colour of that of absorbed light.

The number of P-O-P bond in cyclic metaphosphoric acid is three.

Fe + HNO₃ → Fe₂O₃ + NO₂ + H₂O    
80%

Eukaryotes have three RNA polymerases. RNA polymerase I is located in the nucleolus and transcribes for RNAs (28S, 18S and 5.8S) whereas RNA polymerase II is localised in the nucleoplasm and used for hnRNA, mRNA and RNA polymerase Ill is localised in the nucleus, possibly the nucleolar-nucleoplasm interface and transcribes for tRNA, 5S, RNA and nRNAs.

NCERT Topic: Transcription in eukaryotes

NCERT Line: "The RNA polymerase II transcribes precursor of mRNA, the heterogeneous nuclear RNA (hnRNA)."

FSH is responsible for the initiation of spermatogenesis and sperm differentiation. It binds with Sertoli cells and spermatogonia and induces proliferation of spermatogonia .

So, the correct answer is 'FSH'.

Each Sporogenous cell under meiotic division to form tetrad of megaspores. The three megaspores degenerate and only one megaspore develops into embryo sac or female gametophyte.

Statement i is incorrect because benign tumors do not spread; they remain localized.
Statement ii is correct as malignant tumors invade surrounding tissues and can spread to distant sites (metastasis).
Statement iii is correct as benign tumors usually do not cause significant damage and stay localized.
Statement iv is incorrect because malignant tumors are usually fast-growing and not confined to their original location.
Thus, the correct answer is Option B: ii and iii.

Topic in NCERT: Tumors: benign and malignant

Line in NCERT: "benign tumors normally remain confined to their original location and do not spread to other parts of the body and cause little damage. the malignant tumors, on the other hand are a mass of proliferating cells called neoplastic or tumor cells. these cells grow very rapidly, invading and damaging the surrounding normal tissues. cells sloughed from such tumors reach distant sites through blood, and wherever they get lodged in the body, they start a new tumor there. this property called metastasis is the most feared property of malignant tumors."

• GIFT (Gamete Intra-Fallopian Transfer) involves placing gametes (ova and sperm) directly into the fallopian tube, where natural fertilization can occur (Column II, 3).

• IVF (In Vitro Fertilization) involves fertilizing eggs in the lab and then transferring embryos with more than 8 blastomeres into the uterus (Column II, 1).

• ICSI (Intra-Cytoplasmic Sperm Injection) involves injecting sperm directly into an ovum (Column II, 2).

• IUI (Intra-Uterine Insemination) involves introducing sperm into the uterus or vagina (Column II, 4).

Thus, the correct matches are:
(a) - 3
(b) - 1
(c) - 2
(d) - 4

• One primary spermatocyte produces four sperms. Therefore, 100 sperms will be produced from 25 primary spermatocytes.
• One primary oocyte produces one ovum. Therefore, 25 ova will be produced from 25 primary oocytes.

The structural gene (z) of the lac operon codes for β-galactosidase. It is responsible for the hydrolysis of polysaccharides. The ‘y’ genes code for permease. It increases the permeability of a cell to β-galactosidase. The ‘a’ genes code for transacetylase.

Heterogeneous nuclear RNA or hnRNA is a term that encompasses various types and sizes of RNAs found in the eukaryotic cell nucleus. When this undergoes modifications and processing it will give rise to the mature mRNA that has the inherent code for the protein synthesis (amino acid code). The mRNA in eukaryotes is synthesized in the nucleus and hence should be transported to the cytoplasm and into the ribosome for protein synthesis by the process of translation. 

NCERT Topic: The fully processed hnRNA is called mRNA and is transported out of the nucleus into the cytoplasm for translation.

NCERT Line: "It is the fully processed hnRNA, now called mRNA, that is transported out of the nucleus for translation."

Genotypes of different individuals in the given pedigree chart can be illustrated as:

• In human females, menstruation is repeated at an average interval of about 28/29 days, and the cycle of events starting from one menstruation till the next one is called the menstrual cycle.
• One ovum is released (ovulation) during the middle of each menstrual cycle.
• The cycle starts with the menstrual phase, when menstrual flow occurs and it lasts for 3-5 days. The menstrual phase is followed by the follicular phase.
• During this phase, the primary follicles in the ovary grow to become a fully mature Graafian follicle and simultaneously, the endometrium of uterus regenerates through proliferation.
• The growth of superficial and middle layer of endometrium occurs from the 5^th to 14^th day of the cycle under the influence of estrogen.

• Physiological barriers to the entry of microorganisms into the human body are tears in the eyes, saliva in the mouth and HCl in the stomach.
• The enzymes lysozymes are found in tears and saliva and inhibit the synthesis of peptidoglycan present in the cell wall of microorganisms especially eubacteria.
• Disease-causing microorganism enters through different routes into the body. The physiological barrier prevents their entry. Tears act as a physiological barrier for entry of pathogen.

Topic in NCERT: Innate immunity

Line in NCERT: "skin on our body is the main barrier which prevents entry of the micro-organisms."

Large amount of fossilized pollen grain are found during excavation process of older parts due to tough covering of Sporopollenin that make the outer wall of pollen grain, exine. This substance cannot be hydrolyzed by any enzyme known.

• Embryogeny is the study of the changes that take place when an embryo develops from a zygote.
• It occurs near the embryo sac’s micropylar end.
• The nucellus and integuments unite at the base of the ovule, or chalaza, in plants.
• It can be found on an ovule opposite the micropylar end.
• Chalaza is the pathway via which plant nutrients are delivered to the nucellus.
• Three antipodal cells form from the chalazal end of the embryo sac’s cells.

• Human chorionic gonadotropin (hCG) is a hormone that supports the normal development of an egg in a woman's ovary, and stimulates the release of the egg during ovulation.
• Human chorionic gonadotropin interacts with the LHCG receptor (luteinizing hormone/choriogonadotropin) of blastocyst and promotes the maintenance of the corpus luteum during the beginning of pregnancy. Corpus luteum secretes the hormone progesterone during the first trimester.
• Presence of the hCG in urine is the indication of pregnancy. Its level increases every 48-72 hrs in pregnant women.

DPT vaccine is for diphtheria, pertussis and tetanus. The patient suffering from typhoid is required to be treated with antibiotics as it is a bacterial disease.

When a host is exposed to antigens, which may be in the form of living or dead microbes or other proteins, antibodies are produced in the host body. This type of immunity is called active immunity. Injecting the microbes deliberately during immunisation/vaccination induces active immunity e.g., polio vaccine