Dairy

Step 1: Understanding the Concept:
This question requires the identification of the animal species to which the Jamunapari breed belongs. This is a common type of question in agriculture and animal husbandry exams.
Step 2: Detailed Explanation:
The Jamunapari (also known as Jamnapari) is a well-known breed of domestic goat.
It originated in the Indian subcontinent, specifically in the Etawah district of Uttar Pradesh.
It is prized for both its milk production and meat, and it's one of the largest goat breeds.
It is easily recognizable by its large, drooping ears and prominent Roman nose.
Step 3: Final Answer:
The Jamunapari is a breed of goat.

Step 1: Understanding the Concept:
The question asks to identify the hormone responsible for the milk ejection reflex (also known as milk let-down) and its gland of secretion. This is a fundamental concept in lactation physiology.
Step 2: Detailed Explanation:
Let's examine the options:
(A) Somatotropin: Also known as Growth Hormone (GH), it is secreted by the anterior pituitary gland and is primarily involved in growth and metabolism. While it plays a role in maintaining lactation (galactopoiesis), it does not cause milk let-down.
(B) Parathyroid: This refers to the parathyroid hormone (PTH), which is secreted by the parathyroid glands. Its main function is to regulate calcium and phosphate levels in the blood. It is not involved in milk ejection.
(C) Adrenals: The adrenal glands secrete hormones like adrenaline and cortisol. These are stress hormones and can actually inhibit the milk let-down reflex.
(D) Oxytocin: This hormone is produced in the hypothalamus and stored and released from the posterior pituitary gland. Stimuli like suckling or the sight/sound of the calf trigger its release. Oxytocin acts on the myoepithelial cells surrounding the alveoli in the mammary gland, causing them to contract and eject the milk into the ducts. This process is called the milk let-down reflex.
Step 3: Final Answer:
Oxytocin is the hormone secreted from the posterior pituitary gland that is essential for the ejection of milk.

Step 1: Understanding the Concept:
This is a matching question that tests knowledge of the native tracts or origins of different Indian buffalo breeds.
Step 2: Detailed Explanation:
Let's match each breed from List-I with its origin from List-II:
A. Murrah: This is a high-yield dairy breed originating from the Rohtak, Hisar, and Jind districts of Haryana. So, A matches with IV.
B. Jaffarbadi: This is a heavy breed native to the Gir forest region of the Kathiawar area in Gujarat. So, B matches with III.
C. Mehsana: This breed originated in the Mehsana district of Gujarat and surrounding areas. So, C matches with II.
D. Surti: This breed is found in the Kaira, Anand, and Vadodara districts of Gujarat, which corresponds to the south-western part of Gujarat. So, D matches with I.
The correct combination is A-IV, B-III, C-II, D-I.
Step 3: Final Answer:
Looking at the options, the combination A-IV, B-III, C-II, D-I corresponds to option (D).

Step 1: Understanding the Concept:
The question asks to identify the agency that sets legally binding regulations for food processing, such as the specific time-temperature requirements for pasteurization in a dairy plant.
Step 2: Detailed Explanation:
(A) FDA (Food and Drug Administration): This is a national regulatory agency in the United States. It has the legal authority to create and enforce regulations to ensure food safety. Its Pasteurized Milk Ordinance (PMO) is a key document that prescribes the exact levels of treatment (pasteurization, etc.) for dairy products. Similar national agencies exist in other countries (e.g., FSSAI in India, CFIA in Canada). This is the correct type of agency.
(B) IDF (International Dairy Federation): The IDF is a non-governmental, non-profit international organization that provides a forum for the dairy sector to reach consensus on scientific and technical matters. It develops standards and guidelines but does not have legal enforcement power.
(C) EPA (Environmental Protection Agency): This agency's role is to protect human health and the environment. It would regulate a dairy plant's waste disposal and emissions, not the food processing standards for the milk itself.
(D) WHO (World Health Organization): WHO, along with the FAO, establishes international food standards through the Codex Alimentarius Commission. These are recommendations and a basis for national laws, but WHO itself does not directly regulate individual plants in a country.
A national regulatory body like the FDA is the one that "prescribes" legally mandated treatment levels.
Step 3: Final Answer:
The FDA is an example of a regulatory agency that prescribes the level of treatment needed for a dairy plant.

Step 1: Understanding the Concept:
The question asks to identify a specific traditional Indian dairy dessert based on a description of its composition and texture. The key features are: concentrated, sweetened, and contains layers of clotted cream (malai).
Step 2: Detailed Explanation:
(A) Paneer: An unsweetened, acid-coagulated fresh cheese. It does not contain layers of cream.
(B) Rabri: This is the correct answer. Rabri is made by simmering whole milk on low heat for a long period to concentrate it. As the milk heats, a layer of cream (malai) forms on the surface. This layer is skimmed off and set aside. The process is repeated until the milk is significantly reduced. Finally, the reduced milk is sweetened and the collected layers of cream are added back, giving it a characteristic layered, lumpy texture.
(C) Channa: The unsweetened, acid-coagulated milk solid base used for Bengali sweets.
(D) Gulabjamun: Deep-fried balls of Khoa soaked in sugar syrup.
Step 3: Final Answer:
The product that matches the description of a concentrated, sweetened milk with layers of clotted cream is Rabri.

Step 1: Understanding the Concept:
The question asks for the common regional name for sweetened dahi (Indian yogurt).
Step 2: Detailed Explanation:
(A) Misti dahi: This is the correct term. Originating from Bengal, "Misti" means sweet and "Doi" (or Dahi) means curd/yogurt. It is a traditional sweetened yogurt made by fermenting sweetened, often slightly concentrated, milk. It has a characteristic pinkish-brown color due to the caramelization of sugar.
(B) Blue dahi: This is not a recognized term for a dairy product.
(C) Rasmalai: This is a dessert made from chhana (acid-coagulated cheese) patties soaked in sweetened, thickened milk (rabri). It is not a type of dahi.
(D) Kheer: This is a type of milk pudding, usually containing rice, vermicelli, or tapioca. It is not a fermented product.
Step 3: Final Answer:
Sweetened Dahi is famously known as Misti dahi.

Step 1: Understanding the Concept:
The question asks for the full form of the acronym HACCP, which is a globally recognized, systematic food safety management system.
Step 2: Detailed Explanation:
HACCP is a system that identifies, evaluates, and controls hazards that are significant for food safety. The system is built on seven principles, and its name describes the first two core ideas:
HA - Hazard Analysis: First, you analyze the entire production process to identify any potential biological, chemical, or physical hazards.
CCP - Critical Control Point: Then, you identify the specific points in the process where control can be applied to prevent, eliminate, or reduce a food safety hazard to an acceptable level. These are the "Critical Control Points."
Therefore, the correct full form is Hazard Analysis and Critical Control Point.
The other options contain errors: (B) has the words "Control Critical" inverted, (C) incorrectly specifies only "Chemical" hazards, and (D) incorrectly uses the word "Analyst".
Step 3: Final Answer:
HACCP stands for HAZARD ANALYSIS AND CRITICAL CONTROL POINT.

Step 1: Understanding the Concept:
The question asks about the specific body established by the Food Safety and Standards Authority of India (FSSAI) to coordinate with the Codex Alimentarius Commission (CAC). The CAC is the international body that sets food standards.
Step 2: Detailed Explanation:
Each member country of the Codex Alimentarius Commission is required to establish a single point of contact to facilitate communication and coordinate all Codex-related activities within the country. This designated body is officially known as the National Codex Contact Point (NCCP).
In India, the FSSAI has been designated as the NCCP. The NCCP is responsible for:
Receiving and circulating all Codex documents and notifications.
Coordinating with various ministries, industry associations, and consumer groups to formulate India's stance on various Codex standards.
Representing India in Codex meetings.
The other options, such as the Export Inspection Council and Agencies, are primarily concerned with the quality control and inspection of products for export, which is a different mandate from coordinating international food standard activities.
Step 3: Final Answer:
The body constituted by FSSAI to liaise with the CAC is the National Codex Contact Point.

Step 1: Understanding the Concept:
The question asks to identify the common types of plastic polymers used for packaging in the dairy industry. Different dairy products have different packaging requirements (e.g., rigid vs. flexible, heat resistance).
Step 2: Detailed Explanation:
Let's analyze the use of each material:
A. Polythene (PE): This is the general chemical name for a family of polymers that includes LDPE and HDPE. Since both are widely used, the general term is also correct.
B. LDPE (Low-Density Polyethylene): This polymer is known for its flexibility and excellent heat-sealing properties. It is the primary material used for making flexible milk pouches (milk bags).
C. HDPE (High-Density Polyethylene): This polymer is more rigid and robust than LDPE. It is used extensively for blow-molding rigid containers like milk jugs and bottles.
D. Polypropylene (PP): This polymer is known for its good barrier properties and higher melting point compared to polyethylene. It is widely used for manufacturing tubs for butter and margarine, and cups for yogurt and dahi, as it can withstand hot-filling processes.
All four listed materials are very common and frequently used in various applications within the dairy packaging industry.
Step 3: Final Answer:
Since Polythene (PE), LDPE, HDPE, and Polypropylene (PP) are all frequently used, the correct option includes all of them.

Step 1: Understanding the Concept:
This question requires matching traditional Indian dairy products with the fundamental principle of their manufacturing process.
Step 2: Detailed Explanation:
Let's match each product from List I to its process in List II:
A. Khoa: This is a heat-desiccated milk product. It is made by vigorously boiling and stirring milk in a large, shallow open pan until most of the water evaporates and it reaches a semi-solid, dough-like consistency. This matches with I.
B. Dahi: This is the Indian equivalent of yogurt. It is produced by the fermentation of milk using lactic acid bacteria, which convert lactose into lactic acid, causing the milk to form a gel. This matches with II.
C. Paneer: This is a type of fresh, unripened cheese. It is made by adding an acid (like citric acid or lemon juice) to hot milk, which causes the casein to coagulate. The resulting curd is then separated from the whey by draining. This matches with IV.
D. Peda: This is a popular Indian sweet. Its primary base is Khoa, to which sugar is added and mixed until a smooth paste is formed, which is then shaped. Therefore, the principle is that it is a sweetened Khoa product. This matches with III.
The correct set of matches is A-I, B-II, C-IV, D-III.
Step 3: Final Answer:
Based on the matching, the correct option is (C).

Step 1: Understanding the Concept:
The question asks to identify the activities that are part of the initial milk collection and reception operation at a dairy plant or collection center. This stage is focused on receiving raw milk from farmers or tankers.
Step 2: Detailed Explanation:
The typical workflow at a milk reception dock is as follows:
A. Unloading and Grading: When a milk can or tanker arrives, it is unloaded. An operator then grades the milk, usually by sensory evaluation (smell, appearance) to check for any obvious defects before it is pooled with other milk.
B. Sampling: A representative sample is taken from the consignment. This sample is used for quality control tests (like fat, SNF, acidity, platform tests) which are linked to payment and quality assessment.
C. Weighing: The milk is then poured into a weigh bowl or passed through a flow meter to accurately determine the quantity of milk received. This is essential for record-keeping and payment.
D. Packaging: This is a step in milk processing, not collection. Packaging occurs much later in the process, after the milk has been chilled, clarified, pasteurized, homogenized, etc.
Therefore, unloading/grading, sampling, and weighing are the core activities of the milk collection operation.
Step 3: Final Answer:
The correct components of the milk collection operation are A, B, and C.

Step 1: Understanding the Concept:
The question asks to identify the valid quality control tests performed on butter. Butter quality is assessed based on hygiene, potential for spoilage, and cleanliness.
Step 2: Detailed Explanation:
Let's evaluate each test:
A. Coliform count: This is a standard indicator of post-pasteurization contamination and poor sanitation during the manufacturing and packaging process. A low coliform count is essential. This is a valid test.
B. Lipolytic count: This refers to the enumeration of lipolytic microorganisms (bacteria that produce fat-splitting lipase enzymes). The presence of these organisms is highly undesirable as they can cause hydrolytic rancidity, a major flavor defect in butter. This is a valid test.
C. Yeast and mold count: Yeasts and molds are common contaminants that can grow on the surface of butter, causing discoloration and off-flavors. Their count is a critical indicator of sanitation and the keeping quality of the butter. This is a valid test.
D. Sediment test: This test determines the amount of insoluble extraneous matter (dirt, etc.) in the butter, which reflects the cleanliness of the cream and the manufacturing environment. This is a valid physical quality test.
All four tests are standard procedures used to assess the microbiological and physical quality of butter.
Step 3: Final Answer:
All the listed tests (Coliform count, Lipolytic count, Yeast and mold count, and Sediment test) are used for assessing the quality of butter.

Step 1: Understanding the Concept:
The question asks for the direct source of the contamination found *in* mastitic milk. Mastitis is an infection of the mammary gland (udder).
Step 2: Detailed Explanation:
While external factors can transmit the disease, the question is about the source of the contaminants (bacteria, somatic cells) within the milk itself.
(A) Interior of udder: Mastitis is an infection within the udder tissue. The bacteria multiply inside the udder, and the cow's body responds by sending a large number of white blood cells (somatic cells) to the site. Both the pathogenic bacteria and the high number of somatic cells are shed directly into the milk as it is formed and stored. Therefore, the infected interior of the udder is the direct source of the contamination that defines mastitic milk.
(B) The milker, (C) Utensils, (D) Flies: These are all potential vectors or routes of transmission that can introduce mastitis-causing pathogens to the cow's teat end, leading to an infection. However, they are not the source of the contamination within the milk that has already been drawn from an infected cow.
Step 3: Final Answer:
The direct source of the high bacterial and somatic cell counts that contaminate mastitic milk is the infected interior of the udder itself.

Step 1: Understanding the Concept:
This question tests the knowledge of the regional origins of traditional Indian dairy products. Basundi is a sweetened, condensed milk dish.
Step 2: Detailed Explanation:
Basundi is a dessert made by simmering milk on low heat until it is reduced by about half, and then sweetened with sugar and flavored with cardamom and nuts.
It is extremely popular in the western Indian states of Gujarat and Maharashtra.
It is also very common in the southern Indian states of Karnataka, Andhra Pradesh, Telangana, and Tamil Nadu.
Rajasthan and Haryana are known for products like Ghevar and Rabri, but Basundi is less prominent.
Bengal and Odisha are famous for sweets made from Chhana (coagulated milk protein), such as Rasgulla and Sandesh. A similar product to Basundi here is called Rabri.
Based on this, the option that contains the most prominent regions for Basundi is (C).
Step 3: Final Answer:
Basundi is a popular product in several western and southern states, including Andhra Pradesh, Gujarat, and Karnataka.

Step 1: Understanding the Concept:
The question asks to identify the product from the list that does not use casein or its derivatives (caseinates) as an ingredient. Casein is the main protein in milk, known for its functional properties like emulsification, water binding, and nutritional value.
Step 2: Detailed Explanation:
(A) Ice cream: Sodium caseinate is sometimes used as a stabilizer and emulsifier in ice cream to improve its body and texture.
(B) Coffee whiteners: Sodium caseinate is a key ingredient in most non-dairy coffee whiteners. It encapsulates the fat droplets, providing excellent whitening power and preventing oil separation.
(C) Imitation milk: In imitation or filled milk, where milk fat is replaced by vegetable fat, caseinates are often used as the protein source and to emulsify the fat.
(D) Whevit: The name "Whevit" is derived from "Whey". It is a brand name for a whey-based beverage. The protein source in such a product is whey protein, not casein. Adding casein would be contrary to the product's concept.
Step 3: Final Answer:
Whevit is a whey-based product and therefore does not use edible casein as an ingredient.

Step 1: Understanding the Concept:
The question asks to identify the correct and essential practices for the care of a newborn calf to ensure its health and survival.
Step 2: Detailed Explanation:
Let's evaluate each statement:
A. Removing mucous: This is a critical first step. Clearing the airways (nose and mouth) of mucous and fetal membranes allows the calf to start breathing properly immediately after birth. This statement is correct.
B. Navel care: The navel cord is a potential entry point for infections. Applying an antiseptic like tincture of iodine helps to disinfect and dry the navel, preventing infections like navel ill (omphalitis). This statement is a correct and standard practice.
C. Standing and suckling: A healthy calf should exhibit the instinct to stand and search for the udder to suckle soon after birth, typically within an hour. This indicates good vigor and health. This statement is correct.
D. Colostrum feeding: Colostrum (first milk) is rich in antibodies (immunoglobulins) that provide passive immunity to the calf, protecting it from diseases. The calf's ability to absorb these antibodies is highest in the first few hours of life. It is crucial for the calf to receive colostrum for the first 2-3 days (48-72 hours). This statement is correct.
Since all four statements describe essential and correct practices for newborn calf care, all of them should be included.
Step 3: Final Answer:
All statements A, B, C, and D are correct practices. Therefore, option (C) is the correct choice.

Step 1: Understanding the Concept:
The question asks to identify the major problems or challenges faced by the dairy and livestock sector in India. This requires an understanding of the current state of the industry.
Step 2: Detailed Explanation:
Let's analyze each statement:
A. Deficient animal health care service: This is a well-known challenge. Access to veterinary services, diagnostics, and quality medicines is limited, especially in rural areas, leading to high mortality and morbidity rates in livestock.
B. Insufficient trained manpower: There is a shortage of skilled professionals, including veterinarians, extension workers, and dairy technicians, which hampers the adoption of modern scientific practices in farming.
C. Government policies and lack of resources: While many policies exist, their implementation can be weak due to a lack of resources, infrastructure, and effective delivery mechanisms. This is a significant challenge.
D. Increased adoption level and more skilled persons are available: This statement describes a positive trend or a solution, not a challenge. It claims that adoption and skills are increasing, which is the opposite of a problem.
Therefore, statements A, B, and C correctly identify major challenges, while D is an incorrect statement in the context of challenges.
Step 3: Final Answer:
The major challenges are A, B, and C. The correct option is (B).

Step 1: Understanding the Concept:
The question asks for the typical sugar concentration in Shrikhand, a traditional Indian dessert. Shrikhand is made from strained dahi (curd), known as Chakka, to which a large amount of sugar is added.
Step 2: Detailed Explanation:
Shrikhand is characterized by its thick, creamy consistency and high sweetness. The ratio of Chakka to sugar is a key factor in its final composition. Typically, sugar is added at a rate of 80 to 100 parts per 100 parts of Chakka.
The final product composition is usually targeted to have a total solids content of around 58-60%. According to FSSAI (Food Safety and Standards Authority of India) regulations, the total sugar (as sucrose) in Shrikhand should not exceed 72.5% on a dry matter basis (i.e., as a percentage of total solids).
Let's calculate the sugar percentage based on this regulation for a product with 58% total solids:
This calculation shows that 42% is a very common and legally compliant sugar level for Shrikhand. While 40% is also a common value, 42% aligns perfectly with the standard calculation based on food regulations.
Step 3: Final Answer:
The sugar percentage of Shrikhand is generally around 40-45%, with 42% being a very typical and standard value.

Step 1: Understanding the Concept:
The question asks to identify a dairy byproduct based on its composition: fat, denatured protein, burnt lactose, and minerals. This composition results from a high-heat manufacturing process.
Step 2: Detailed Explanation:
Let's analyze the manufacturing process and resulting composition:
Ghee-residue: Ghee is produced by clarifying butter or cream at high temperatures (typically above 110°C) to remove water and milk solids-not-fat (MSNF). The solid particles that settle out and are filtered off constitute the ghee-residue. This residue consists of proteins that have been denatured by the high heat, lactose that has caramelized or "burnt" (causing the characteristic brown color), entrapped fat, and minerals. This perfectly matches the description in the question.
Condensed whey/Whey paste: These products are made by concentrating whey. While they contain protein, lactose, and minerals, the lactose is not typically "burnt" as the processing temperatures are lower than in ghee making.
Step 3: Final Answer:
Ghee-residue is the nutritious food byproduct that contains fat, denatured protein, burnt lactose, and minerals resulting from the high-temperature clarification of butterfat.

Step 1: Understanding the Concept:
This question pertains to food laws and regulations, specifically the maximum permitted level of additives (stabilizers and emulsifiers) in ice cream. These ingredients are used in small quantities to control the texture, melting properties, and shelf life of the product.
Step 2: Detailed Explanation:
Food safety authorities, such as the FSSAI (Food Safety and Standards Authority of India), set legal limits on the use of food additives to ensure consumer safety and product quality.
For ice cream, these regulations specify that the total concentration of permitted stabilizers and emulsifiers, when used alone or in combination, must not exceed a certain percentage of the final product's weight.
The established legal limit in India and many other regions is 0.5%. Using amounts higher than this can lead to undesirable gummy textures and is not permitted.
Step 3: Final Answer:
According to food regulations, the total amount of stabilizers and emulsifiers in ice cream should not exceed 0.5 percent by weight.

Step 1: Understanding the Concept:
The question describes a critical safety component of a High-Temperature Short-Time (HTST) pasteurizer system. This component ensures that only milk that has been heated to the correct temperature proceeds for cooling and packaging.
Step 2: Detailed Explanation:
In an HTST system, milk flows continuously. A temperature sensor is placed at the end of the holding tube. This sensor is connected to a special three-way valve.
Flow Diversion Valve (FDV): This is the correct name for the valve. If the sensor detects that the milk temperature is at or above the legal minimum (e.g., 72°C), the FDV stays in the "forward flow" position, allowing the milk to continue to the cooling section. If the temperature drops below the set point, the FDV automatically switches to the "diverted flow" position, sending the under-processed milk back to the raw milk balance tank to be re-pasteurized. This is a fail-safe mechanism.
Q and F valve: Q and F are terms related to the kinetics of chemical reactions/microbial death with temperature, not types of valves.
Flow dispersion valve: This is not a standard term for the safety valve in a pasteurizer.
Step 3: Final Answer:
The safety valve that diverts under-pasteurized milk back for reprocessing is called the Flow Diversion Valve (FDV).

Step 1: Understanding the Concept:
The question asks to identify the correct commercial applications of lactose, which is the sugar extracted from milk whey.
Step 2: Detailed Explanation:
Let's analyze each statement:
A. In infant food: This is a major use. Cow's milk has less lactose than human milk. So, lactose is added to infant formula based on cow's milk to adjust the carbohydrate level to be closer to that of human breast milk. This statement is correct.
B. In caramel or fudges: Lactose has low solubility and crystallizes into small crystals, which contributes to the texture of some confections. It also participates in the Maillard browning reaction, contributing to color and flavor in baked goods and caramel. This statement is correct.
C. In solid pharmaceutical preparations...: Lactose is widely used as an excipient (an inert filler or binder) in the pharmaceutical industry to manufacture tablets and capsules due to its inertness, good compressibility, and low cost. This statement is correct.
D. In manufacturing whey proteins: This statement is incorrect. Whey proteins are manufactured from whey, which is a solution of lactose, whey proteins, and minerals. To produce whey protein concentrate (WPC) or isolate (WPI), lactose is removed from the whey using processes like ultrafiltration. Lactose is a co-product of whey protein manufacturing, not an ingredient used in it.
Step 3: Final Answer:
The correct commercial uses of lactose are in infant food, confectionery, and pharmaceuticals. Therefore, statements A, B, and C are correct.

Step 1: Understanding the Concept:
The question asks to classify Kalakand, a traditional Indian dairy sweet, based on its preparation method.
Step 2: Detailed Explanation:
Kalakand is made by continuously stirring and boiling milk until it thickens and reduces. During this process, a small amount of an acidulant (like citric acid or alum) is often added to cause partial coagulation, which gives Kalakand its characteristic grainy texture. Sugar is added towards the end of the process. The final product is a semi-solid, sweetened, granular mass.
Let's analyze the options:
(A) Fermented product: No fermentation or starter culture is used. Incorrect.
(B) Acid coagulated product: While some acid is used, the primary process is intense heat concentration (like making Khoa). Products like Paneer or Chhana are purely acid-coagulated without this intense heat desiccation. So, this is an incomplete description.
(C) Sweetened heat coagulated product: This is the most accurate description. The product is defined by extensive heating (heat coagulation/desiccation), the addition of sugar (sweetened), and the resulting coagulated texture.
(D) Dried milk product: Kalakand is a moist, semi-solid product, not a dried powder. Incorrect.
Step 3: Final Answer:
Kalakand is best described as a sweetened heat coagulated product.

Step 1: Understanding the Concept:
This question addresses the effect of single-stage homogenization on the physical properties of milk, specifically its viscosity, and the mechanism behind this effect.
Step 2: Detailed Explanation:
Analysis of Assertion (A): Homogenization is a process that breaks down large fat globules into much smaller ones. In a single-stage homogenizer, milk is forced at high pressure through a narrow valve. This breaks the fat globules, but the newly created fat surface area is vast, and there isn't enough natural membrane material (proteins, phospholipids) to cover it all immediately. As a result, the small, unprotected fat globules tend to stick together, forming large clumps or clusters. These clusters interfere with the flow of the liquid, causing a significant increase in viscosity. Thus, Assertion (A) is true.
Analysis of Reason (R): This statement describes the mechanism of cluster formation. The newly formed fat globules share the available protein membranes, leading to the formation of clusters where the individual globules are linked by these shared membranes. The fat inside each globule remains separate. This is an accurate description of the "fat clumping" phenomenon in single-stage homogenization. Thus, Reason (R) is true.
Relationship between (A) and (R): The formation of the fat globule clusters as described in (R) is the direct physical reason for the increase in viscosity stated in (A). Therefore, (R) is the correct explanation for (A).
Step 3: Final Answer:
Both Assertion (A) and Reason (R) are correct, and (R) correctly explains (A). (Note: This is why two-stage homogenizers are used; the second, lower-pressure stage breaks up these clusters).

Step 1: Understanding the Concept:
The question asks to identify which of the listed chemicals is not used as a sterilizing or sanitizing agent for equipment in the dairy industry. Sanitizers are chemical agents that reduce the number of microorganisms to a safe level.
Step 2: Detailed Explanation:
(A) Chlorine: Chlorine-based compounds (e.g., sodium hypochlorite) are widely used, effective, and inexpensive sanitizers in the dairy industry.
(B) Quaternary ammonium compounds (QACs): QACs are another major class of sanitizers used for food contact surfaces. They are effective and leave a residual antimicrobial film.
(C) Hydrogen peroxide: A solution of hydrogen peroxide, often combined with heat, is a powerful sterilizing agent, famously used for sterilizing the packaging material in aseptic packaging systems (e.g., Tetra Pak).
(D) Sulphuric acid: This is a highly corrosive and dangerous strong mineral acid. It is not used for sanitizing or sterilizing food processing equipment because it would severely damage the stainless steel surfaces and pose an extreme safety hazard. It is used in labs (e.g., for the Gerber fat test) and for industrial purposes like pH control of wastewater, but not for sanitation.
Step 3: Final Answer:
Sulphuric acid is not used as a sterilizing agent in the dairy industry.

Step 1: Understanding the Concept:
A clarifier is a piece of dairy processing equipment that uses centrifugal force to clean raw milk before further processing.
Step 2: Detailed Explanation:
A clarifier is a centrifuge specifically designed to remove solid impurities from milk. When milk is spun at high speed, the components separate based on their density.
(A) Removal of dense foreign matter...: Solid particles like dirt, dust, straw, as well as biological material like somatic cells (leucocytes) and bacterial clumps, are denser than the milk serum. The centrifugal force throws these particles to the outer wall of the centrifuge bowl, where they collect as a sludge. This is the primary function of a clarifier.
(B) & (C) Separation/Removal of fat: This is the function of a cream separator, which is a different type of centrifuge designed with discs to efficiently separate the less dense fat (cream) from the denser skim milk. A clarifier is not designed for this.
(D) Recovery of whey protein solids: This is typically done using membrane filtration techniques like ultrafiltration, not clarification.
Step 3: Final Answer:
The main function of a clarifier is to clean milk by removing denser impurities such as dirt and cellular debris.

Step 1: Understanding the Concept:
The question asks for the primary function of a triple-effect evaporator in the dairy industry. An evaporator is a piece of equipment designed to remove water from a liquid.
Step 2: Detailed Explanation:
An evaporator works by boiling a liquid to turn water into vapor, which is then removed, leaving a more concentrated liquid behind. In the dairy industry, this process is known as "condensing" or "concentration".
A "multiple-effect" evaporator (like a double or triple-effect) is a system of multiple evaporators (called effects) linked together to improve energy efficiency. The water vapor produced in the first effect is used as the heating source for the second effect, and so on.
This technology is used to produce condensed milk, evaporated milk, and to pre-concentrate milk before making milk powder.
The other options are incorrect:
(A) Separation of milk (fat from skim milk) is done by a cream separator (centrifuge).
(C) Whey separation from cheese curd is done by draining.
(D) Fermentation of milk is a biochemical process used to make products like yogurt and is done in fermentation tanks.
Step 3: Final Answer:
A triple-effect evaporator is used for the energy-efficient condensing (concentration) of milk by removing water.