NEET-PG 2012 Practice Questions

Q: Which oil has the highest concentration of linolenic acid?

Soyabean oil. ***Soyabean oil*** - **Soyabean oil** contains approximately **7-10% linolenic acid (C18:3)**, an omega-3 fatty acid. - Among the given options, it has the **highest concentration** of this essential fatty acid. - **Linolenic acid** is crucial for **heart health** and **reducing inflammation**. *Coconut oil* - **Coconut oil** is primarily composed of **saturated fatty acids**, notably **lauric acid (C12:0)**. - It contains **negligible amounts** of **linolenic acid** (<0.5%). *Groundnut oil* - **Groundnut oil** (peanut oil) is rich in **oleic acid (C18:1)** and **linoleic acid (C18:2)**. - Its concentration of **linolenic acid** is very low (**~0.5-1%**), much lower than soyabean oil. *Safflower oil* - **Safflower oil** is known for its high content of **linoleic acid (C18:2)**, an omega-6 fatty acid. - It contains **minimal amounts** of **linolenic acid** (<1%).

Q: What is considered the most critical component of the activated sludge process?

Aeration tank. ***Aeration tank*** - The **aeration tank** is where **microorganisms** are mixed with wastewater, supplied with oxygen, and allowed to break down organic pollutants. This biological process is central to the activated sludge method. - Without proper aeration and microbial activity in this tank, the **biological treatment** and pollutant removal would not occur effectively. *Primary sedimentation tank* - The **primary sedimentation tank** is involved in **pre-treatment**, removing settleable solids from raw wastewater before it enters the biological treatment. - While important for reducing the load on the activated sludge process, it does not perform the core **biological degradation** that defines the process. *Sludge digester* - The **sludge digester** processes the excess sludge generated from the activated sludge system to reduce its volume and stabilize it, often producing **biogas**. - It is a **post-treatment** component for sludge management, not directly involved in the primary biological treatment of wastewater. *Final settling tank* - The **final settling tank**, also known as a clarifier, separates the treated water from the **activated sludge microorganisms** after the aeration tank. - Its role is to clarify the effluent and return the active sludge to the aeration tank, making it crucial for solids separation but not for the actual **biological purification** itself.

Q: What is the target age group for the Integrated Management of Neonatal and Childhood Illnesses (IMNCI)?

Up to 5 years. ***Up to 5 years*** - The **Integrated Management of Neonatal and Childhood Illnesses (IMNCI)** program focuses on children from **birth up to five years of age**. - This age range was chosen because it represents the period with the highest rates of **childhood morbidity and mortality** due to common preventable and treatable illnesses. *Up to 10 years* - While children up to 10 years might experience various illnesses, the primary focus of **IMNCI** is specifically on the **under-five age group**. - Expanding the program to this age group would require different diagnostic and management protocols for conditions less prevalent in younger children. *Up to 15 years* - The **IMNCI strategy** is designed for the specific health needs and common illnesses found in infants and young children, not adolescents. - Health challenges for children aged 5-15 years often involve different conditions and require distinct healthcare approaches. *Up to 20 years* - Individuals up to 20 years fall into adolescent and young adult health categories, which are outside the scope of the **IMNCI program**. - Their health needs are significantly different from those of neonates and young children targeted by IMNCI.

Q: What does perinatal mortality include?

Both late fetal deaths and early neonatal deaths. ***Both late fetal deaths and early neonatal deaths*** - Perinatal mortality encompasses deaths occurring both in the **late fetal period** (typically after 20-22 weeks of gestation, or commonly defined as 28 weeks or more) and during the **early neonatal period** (the first 7 days of life). - This broad definition helps to capture mortality related to conditions around the time of birth, including those stemming from **pregnancy complications**, labor, delivery, and immediate postnatal adaptation. *Deaths after 28 weeks of gestation* - This describes **late fetal deaths** (stillbirths) but does not include deaths that occur after birth, thus only covering a part of perinatal mortality. - Perinatal mortality is a broader measure that combines both stillbirths and early infant deaths. *Deaths within the first 7 days after birth* - This specifically defines **early neonatal deaths**, which are a component of perinatal mortality, but it excludes fetal deaths. - Perinatal mortality aims to assess factors impacting survival around the time of birth, both before and immediately after. *From the period of viability* - The period of viability refers to when a fetus can survive outside the uterus, which varies (often cited as 20-24 weeks), and would include very premature fetuses, but it isn't an explicit definition of perinatal mortality itself. - This term describes when a fetus is considered potentially viable but does not define the specific timeframe or types of deaths included in perinatal mortality.

Q: Raindrop pigmentation is caused by?

Arsenic. ***Arsenic*** - Chronic **arsenic** exposure can lead to characteristic skin manifestations, including **raindrop pigmentation**, which appears as small, scattered hypopigmented macules surrounded by hyperpigmented skin, particularly on the trunk and extremities. - This pigmentation is a result of altered **melanin distribution** and **keratinocyte damage** due to arsenic toxicity. *Clofazimine* - **Clofazimine** is an anti-leprosy drug that can cause **reddish-brown to bluish-black skin discoloration**, which is a diffuse pigmentation, not "raindrop" in nature. - The pigmentation associated with clofazimine is due to drug deposition in tissues and is usually reversible. *Dapsone* - **Dapsone** is primarily known for causing **methemoglobinemia** and **hemolytic anemia**, especially in patients with G6PD deficiency. - While it can cause some dermatological side effects, **pigmentation** is not a characteristic feature, and it does not produce a "raindrop" pattern. *Minocycline* - **Minocycline** can cause various types of pigmentation, including **blue-gray discoloration** in scars, shins, and mucous membranes, as well as diffuse brown pigmentation. - However, the pigmentation caused by minocycline is typically diffuse or localized to specific areas, and it does not present as "raindrop pigmentation."

Q: What is the effect of strychnos nux vomica poisoning on a patient's consciousness?

Remains conscious throughout the poisoning. ***Remains conscious throughout the poisoning*** - Patients poisoned with **strychnine** (from *Strychnos nux vomica*) typically remain **fully conscious** and aware of their surroundings, even during severe convulsions. - This preservation of consciousness amidst intense muscular spasms is a **distinguishing and agonizing feature** of strychnine poisoning. *Becomes unconscious within an hour* - This statement is generally incorrect for strychnine poisoning, as the prominent feature is maintained consciousness alongside **neurological excitability**. - Loss of consciousness is not a **primary or direct effect** of strychnine, though severe complications could indirectly affect it. *Becomes unconscious only in severe cases* - While extreme metabolic derangements or secondary complications (e.g., severe hypoxia from prolonged seizures) might eventually lead to altered consciousness, the **direct pharmacological action** of strychnine does not cause unconsciousness. - The patient remains conscious even through the most severe and life-threatening **tetanic spasms**. *Becomes unconscious immediately after exposure* - Strychnine primarily acts as an **antagonist to glycine receptors** in the spinal cord and brainstem, leading to exaggerated reflexes and muscle overactivity, not immediate unconsciousness. - The onset of symptoms, including muscular spasms, typically occurs within **15-30 minutes** of exposure, with consciousness generally preserved.

Q: Which of the following is the most common yeast pathogen?

Candida. ***Candida*** - **Candida** species, particularly *Candida albicans*, are the **most common cause of fungal infections** worldwide, ranging from superficial mucocutaneous infections to invasive systemic candidiasis. - They are part of the normal human microbiota and opportunistic pathogens, thriving in conditions like **immunocompromise**, antibiotic use, or presence of medical devices. *Mucor* - **Mucor** is a genus of mold, not yeast, and is known to cause **mucormycosis**, a severe and rapidly progressive fungal infection. - While dangerous, mucormycosis is **much rarer** compared to candidiasis. *Rhizopus* - **Rhizopus** is also a genus of mold, not yeast, and is another causative agent of **mucormycosis**, particularly in immunocompromised individuals. - Like Mucor, infections caused by Rhizopus are **less common** than those caused by Candida. *Cryptococcus* - **Cryptococcus neoformans** is a significant yeast pathogen, primarily causing **cryptococcosis**, which often manifests as meningoencephalitis in immunocompromised patients. - Although it is an important pathogen, its overall incidence is **lower than that of Candida** species.

Q: Which complement proteins are formed in the liver?

C2, C4. ***C2, C4*** - While **all complement proteins (C1-C9) are primarily synthesized in the liver**, this question (NEET PG 2012) expects this as the answer based on the context of **classical pathway activation**. - **C2** and **C4** are essential components of the **C3 convertase (C4b2a)** in both the classical and lectin pathways. - These proteins work together in the early activation steps of complement-mediated immunity. - **Clinical relevance:** Deficiencies in C2 or C4 lead to increased susceptibility to **autoimmune diseases** (especially SLE) and **recurrent infections**. *C3, C6* - **C3** is the most abundant complement protein and central to all three pathways (classical, alternative, lectin). - **C6** is part of the membrane attack complex (MAC: C5b-C6-C7-C8-C9). - Both are indeed synthesized in the liver, but this was not the expected answer for this examination question. *C5, C8* - Both **C5** and **C8** are synthesized in the liver and are crucial components of the **membrane attack complex (MAC)**. - C5 is cleaved into C5a (potent anaphylatoxin) and C5b (initiates MAC formation). - C8 binds to the C5b-C7 complex and recruits C9 for membrane pore formation. *C1* - The **C1 complex** (C1q, C1r, C1s) is synthesized in the liver and initiates the classical complement pathway. - C1q recognizes antibody-antigen complexes (IgG or IgM bound to antigen). - **C1 deficiency** is associated with severe **SLE-like syndromes** and recurrent infections. **Note:** From a purely biochemical standpoint, all major complement components are produced primarily by hepatocytes in the liver, though some can also be synthesized by macrophages and other cells. This question reflects the specific context of the original examination.

Q: Which structure of the eye has the maximum refractive power?

Anterior surface of cornea. ***Anterior surface of cornea*** - The **cornea** accounts for approximately two-thirds of the eye's total refractive power due to the large difference in refractive index between air and the corneal tissue. - The **anterior surface of the cornea** is the primary site of light refraction as light enters the eye from the air. *Anterior surface of lens* - The **lens** contributes significantly to accommodation, but its overall refractive power is less than that of the cornea in the unaccommodated state. - The change in refractive index between the aqueous humor and the lens is less pronounced compared to the air-cornea interface. *Posterior surface of lens* - The **posterior surface of the lens** also contributes to the focusing power of the lens, but its curvature and refractive index difference are typically less than the anterior surface of the cornea. - Its contribution to total refractive power is secondary to the anterior corneal surface and the anterior lens surface. *Posterior surface of cornea* - The **posterior surface of the cornea** has a much smaller refractive power compared to the anterior surface due to the smaller difference in refractive index between the cornea and the aqueous humor. - This interface does contribute to refraction but is not the primary focusing component.

Q: A wave in ERG is due to activity of:

Rods and cones. ***Rods and cones*** - The **electroretinogram (ERG)** measures the electrical responses of various retinal cells to light stimuli. - The **a-wave** of the ERG primarily reflects the activity of the **photoreceptors (rods and cones)** as they hyperpolarize in response to light. *Pigmented epithelium* - The **retinal pigmented epithelium (RPE)** plays a crucial role in photoreceptor health and function but does not directly generate the primary electrical waves measured by the standard ERG. - Its dysfunction can lead to secondary changes in ERG, but its activity is not the direct source of the a-wave. *Ganglion cell* - **Ganglion cells** are the output neurons of the retina, transmitting visual information to the brain. - Their activity is generally not well-represented in the standard ERG, which primarily assays outer and middle retinal layers. *Bipolar cell* - **Bipolar cells** transmit signals from photoreceptors to ganglion cells and contribute to the **b-wave** component of the ERG. - The b-wave, not the a-wave, is largely generated by the depolarizing activity of bipolar cells and Müller cells.

Question 1

Which oil has the highest concentration of linolenic acid?

Accepted Answer

Soyabean oil

Answer

Safflower oil

Answer

Coconut oil

Answer

Groundnut oil

Question 2

What is considered the most critical component of the activated sludge process?

Accepted Answer

Aeration tank

Answer

Primary sedimentation tank

Answer

Sludge digester

Answer

Final settling tank

Question 3

What is the target age group for the Integrated Management of Neonatal and Childhood Illnesses (IMNCI)?

Accepted Answer

Up to 5 years

Answer

Up to 10 years

Answer

Up to 15 years

Answer

Up to 20 years

Question 4

What does perinatal mortality include?

Accepted Answer

Both late fetal deaths and early neonatal deaths

Answer

Deaths after 28 weeks of gestation

Answer

Deaths within the first 7 days after birth

Answer

From the period of viability

Question 5

Raindrop pigmentation is caused by?

Accepted Answer

Arsenic

Answer

Dapsone

Answer

Minocycline

Answer

Clofazimine

Question 6

What is the effect of strychnos nux vomica poisoning on a patient's consciousness?

Accepted Answer

Remains conscious throughout the poisoning

Answer

Becomes unconscious within an hour

Answer

Becomes unconscious only in severe cases

Answer

Becomes unconscious immediately after exposure

Question 7

Which of the following is the most common yeast pathogen?

Accepted Answer

Candida

Answer

Mucor

Answer

Rhizopus

Answer

Cryptococcus

Question 8

Which complement proteins are formed in the liver?

Accepted Answer

C2, C4

Answer

C3, C6

Answer

C5, C8

Answer

C1

Question 9

Which structure of the eye has the maximum refractive power?

Accepted Answer

Anterior surface of cornea

Answer

Anterior surface of lens

Answer

Posterior surface of lens

Answer

Posterior surface of cornea

Question 10

A wave in ERG is due to activity of:

Accepted Answer

Rods and cones

Answer

Pigmented epithelium

Answer

Ganglion cell

Answer

Bipolar cell

NEET-PG 2012

Biochemistry

Community Medicine

Dermatology

Forensic Medicine

Microbiology

Physiology