Q3271. In India’s Universal Immunisation Programme, the rotavirus vaccine is administered via which route?
RAS Prelims MCQ Practice
9,654 RAS Prelims practice MCQs with the correct answer and a clear explanation for each. Filter by subject and chapter.
Practice questions based on the RPSC RAS Prelims syllabus. They follow the exam pattern but are not past-paper questions.
Showing 3271–3280 of 9654 questions
Browse by subject
Q3272. Typhoid fever is primarily transmitted through:
Explanation
Typhoid fever is caused by the bacterium Salmonella typhi and is primarily transmitted through the fecal-oral route. This occurs when a person consumes food or water that has been contaminated by the waste of an infected individual or a chronic carrier of the bacteria. Maintaining high standards of personal hygiene, sanitation, and water safety is critical for preventing the spread of this serious bacterial infection.
Q3273. The Mantoux test (Tuberculin skin test) is used as a screening tool for:
Explanation
The Mantoux test is a diagnostic tool used to determine if a person has been infected with Mycobacterium tuberculosis. It involves injecting a small amount of tuberculin purified protein derivative into the skin of the forearm. A healthcare professional then examines the site after forty-eight to seventy-two hours; a characteristic swelling or induration indicates a positive reaction, suggesting that the person’s immune system has recognized the bacteria.
Q3274. The classical symptom of malaria involving cold, hot, and sweating stages corresponds to the:
Explanation
The classical fever paroxysms of malaria, which include stages of intense cold, high fever, and profuse sweating, are caused by the periodic rupture of infected red blood cells. When these cells burst, they release thousands of merozoites and various metabolic waste products into the bloodstream. This synchronous release triggers the body’s inflammatory response, leading to the characteristic cycles of fever that are typical of the malarial infection.
Q3275. Match List I with List II and select the correct answer:
| Immune System Component | Role |
|---|---|
| A. Skin | i. Long-term specific immunity |
| B. Lysozyme in tears | ii. Physical barrier |
| C. T-cells | iii. Cell-mediated immunity |
| D. Memory B-cells | iv. Chemical barrier |
Explanation
The skin serves as the primary physical barrier of the innate immune system. Lysozymes found in tears act as a chemical barrier by destroying the cell walls of certain bacteria. T-cells are central to cell-mediated immunity, directly attacking infected cells. Memory B-cells provide long-term specific immunity by remembering past infections and producing antibodies quickly upon re-exposure to the same pathogen.
Q3276. Atherosclerosis, a major cause of coronary artery disease, is characterized by:
Explanation
Atherosclerosis is a condition where the arteries become narrowed and hardened due to the buildup of fatty deposits called plaques. These plaques consist of cholesterol, fatty substances, cellular waste products, and calcium. Over time, this buildup restricts the flow of oxygen-rich blood to the heart and other parts of the body, which can lead to serious cardiovascular problems such as heart attacks and strokes.
Q3277. Before the enactment of the Food Safety and Standards Act, 2006, food adulteration in India was primarily regulated under the:
Explanation
The Prevention of Food Adulteration Act of 1954 was the primary legislation in India governing food safety for several decades. It set various standards for food purity and provided the legal framework for detecting and punishing food adulteration. In 2006, this act and several other food-related orders were consolidated into the more comprehensive Food Safety and Standards Act to create a single, unified regulatory authority.
Q3278. Read the following statements and select the correct option:
Assertion (A): Sickle cell trait provides a survival advantage against severe malaria.
Reason (R): The abnormal haemoglobin in sickle cell trait makes the red blood cells less hospitable for the malaria parasite to multiply.
Assertion (A): Sickle cell trait provides a survival advantage against severe malaria.
Reason (R): The abnormal haemoglobin in sickle cell trait makes the red blood cells less hospitable for the malaria parasite to multiply.
Explanation
Individuals with the sickle cell trait have a survival advantage in regions where malaria is endemic. The sickle cell mutation causes some red blood cells to take on an abnormal shape, which makes it difficult for the Plasmodium parasite to survive and multiply within them. This natural selection has resulted in a higher prevalence of the sickle cell gene in populations historically exposed to severe forms of malaria.
Q3279. The primary function of the large intestine in the human digestive system is to:
Explanation
The large intestine is the final section of the human digestive tract. Its primary function is to absorb water, salts, and certain vitamins from the indigestible food matter that remains after the small intestine has absorbed most nutrients. This process converts the liquid waste into solid stool, which is then stored before excretion. Maintaining proper hydration is essential for the efficient functioning of the large intestine.
Q3280. Which of the following components of the immune system releases histamine during an allergic reaction?
Explanation
Mast cells are a type of white blood cell that plays a central role in allergic reactions and the body’s inflammatory response. When these cells encounter an allergen to which they have been sensitized, they release various chemicals, most notably histamine. Histamine causes common allergy symptoms such as swelling, itching, and redness by increasing the permeability of blood vessels and stimulating nerve endings in the affected tissue.Answer key for these questions
| Q | Correct answer |
|---|---|
| 3271 | (c) Oral drops |
| 3272 | (a) Contaminated food and water |
| 3273 | (d) Tuberculosis infection |
| 3274 | (b) Rupture of red cells releasing merozoites |
| 3275 | (a) A-ii, B-iv, C-iii, D-i |
| 3276 | (d) Deposition of fatty plaques in the arterial walls |
| 3277 | (a) Prevention of Food Adulteration Act, 1954 |
| 3278 | (a) Both A and R are true and R is the correct explanation of A. |
| 3279 | (d) Absorbing water and electrolytes from waste matter |
| 3280 | (b) Mast cells |
Frequently asked questions
How many RAS Prelims practice MCQs are there on RAS Prelims?
This page has 9654 practice MCQs on the RAS Prelims syllabus. Each has the correct answer, and most have an explanation.
How should I practise MCQs for RAS Prelims?
Attempt each question first, then open the answer and read the explanation. Practise one chapter at a time, note the facts you got wrong and revise them. Repeat the chapter after a few days.
Are these actual RAS Prelims past-paper questions?
No. These are practice questions written for the RAS Prelims syllabus. They follow the pattern the exam uses: factual questions, statement-based questions, match-the-list and assertion-reason.