Prepare yourself for the upcoming WBPSC Miscellaneous exam

✅ Correct Answer: A. Chattisgarh

📚 Explanation: Bhilai is a major industrial city famous for its large-scale steel plant. It is located in the Durg district of the state of Chhattisgarh in central India.

The Bhilai Steel Plant was established with the assistance of the USSR in 1955. It has been a significant contributor to the nation's industrial growth and economy for several decades.

✅ Correct Answer: B. Karnam Malleswari

📚 Explanation: Karnam Malleswari made history by becoming the first Indian woman to win an Olympic medal. She achieved this milestone at the Sydney 2000 Summer Olympics.

She won the Bronze medal in the 69 kg category of weightlifting. Her victory was a major turning point for women in Indian sports, inspiring many future athletes to compete at the global level.

✅ Correct Answer: B. 10 hours

📚 Explanation: To solve this, let the time taken by the longer pipe be x hours. Then the smaller pipe takes x + 5 hours. Their combined work rate is 1/x + 1/(x + 5) = 1/6.

Solving the equation (x + 5 + x) / (x * (x + 5)) = 1/6 leads to x = 10. Therefore, the longer pipe alone can fill the entire swimming pool in exactly 10 hours.

✅ Correct Answer: C. Electromagnetic waves

📚 Explanation: Light waves are classified as electromagnetic waves because they consist of oscillating electric and magnetic fields. Unlike sound waves, they do not require a material medium to travel.

These waves can move through a vacuum at a constant speed. This property allows light from the sun and stars to reach Earth across the vast emptiness of space.

✅ Correct Answer: C. Rs. 39,000/-

📚 Explanation: The government tax is 35% of the lottery prize, which is 0.35 * 60,000 = Rs. 21,000. This amount is deducted from the total winnings before the man receives his share.

By subtracting the tax from the total (60,000 - 21,000), we find the final amount. He actually receives Rs. 39,000 in hand after the mandatory deduction.

✅ Correct Answer: B. Pakistan People’s Party

📚 Explanation: The Pakistan People’s Party (PPP) led a coalition government that completed its full term from 2008 to 2013. This was the first time a civilian government in Pakistan lasted for five years.

Asif Ali Zardari served as the President during this historic period. This event was seen as a significant step toward democratic stability in the country’s political history.

✅ Correct Answer: A. Kirit Parekh Committee

📚 Explanation: The Indian government moved toward market-linked pricing for petroleum products based on the suggestions of the Kirit Parekh Committee. This group was formed to look into the financial health of oil companies.

The report paved the way for the total deregulation of diesel and petrol prices. This allowed fuel rates to change according to international market trends rather than being fixed by the state.

✅ Correct Answer: A. Tokyo

📚 Explanation: Tokyo has frequently topped the list of the world's most expensive cities in various global surveys over the years. The ranking is based on high costs for housing, food, and transport.

While cities like Zurich or Singapore often compete for this spot, Tokyo remains a standard reference for high living costs in historical data. It reflects the economic strength and high standard of living in Japan.

✅ Correct Answer: D. Virginia Woolf

📚 Explanation: ‘A Haunted House’ is a famous short story written by the British modernist author Virginia Woolf. It was first published in her collection in 1921.

The story is known for its poetic language and focus on the inner thoughts of the characters. Woolf is celebrated as one of the most innovative and influential writers of the 20th century.

✅ Correct Answer: C. Purulia

📚 Explanation: Purulia is the westernmost district of the state of West Bengal, bordering Jharkhand. It is part of the western plateau region characterized by rugged terrain.

The district is well-known for its unique landscape and traditional Chhau dance. It is one of the few regions in the state that experiences extreme weather conditions due to its geography.

✅ Correct Answer: D. India

📚 Explanation: India is the world's largest consumer and importer of gold because of its high demand for jewelry and as a safe investment. Gold holds deep cultural and economic value for many Indian families.

The country imports a massive volume of the metal every year to satisfy domestic needs. This high import rate significantly impacts the nation's trade balance and foreign exchange.

✅ Correct Answer: D. Raghu-Vangsha

📚 Explanation: ‘Raghu-Vangsha’ is a Sanskrit epic poem composed by the legendary poet Kalidasa. It describes the lives and achievements of the kings belonging to the solar dynasty of Raghu.

Kalidasa is widely regarded as the greatest writer of classical Sanskrit literature. His works are admired for their beautiful descriptions of nature and deep human emotions.

✅ Correct Answer: B. Subarnarekha

📚 Explanation: The industrial city of Jamshedpur is located on the banks of the Subarnarekha river in Jharkhand. This river provides the essential water supply for the city's massive steel industry.

The Subarnarekha flows through the states of Jharkhand, West Bengal, and Odisha. It is a vital geographical feature that supported the growth of Tata Steel since 1907.

✅ Correct Answer: A. 7 : 4

📚 Explanation: To find the ratio, substitute X = 4 and Y = 7 into the expression (21X + 2Y) : (7X + 4Y). This gives (21 * 4 + 2 * 7) : (7 * 4 + 4 * 7).

The calculation results in (84 + 14) : (28 + 28), which is 98 : 56. Dividing both numbers by 14 gives the final simplified ratio of 7 to 4.

✅ Correct Answer: C. Dostoevsky

📚 Explanation: ‘Crime and Punishment’ is a masterpiece novel written by the Russian author Fyodor Dostoevsky, first published in 1866. It explores the mental struggle and moral dilemmas of its protagonist.

The book is a classic of world literature and a deep study in human psychology. Dostoevsky's work has had a lasting influence on modern philosophical and psychological thought.

✅ Correct Answer: A. Anaimudi

📚 Explanation: Anaimudi is the highest peak in the Deccan Plateau and also the highest point in South India. It is located in the Idukki district of Kerala within the Western Ghats range.

Rising to an altitude of 2,695 meters, it is often called the "Everest of South India." The peak is part of a national park and is rich in unique mountain biodiversity.

✅ Correct Answer: A. Darwin

📚 Explanation: Although the phrase was coined by Herbert Spencer, Charles Darwin used it in his work on evolution to describe natural selection. It refers to the idea that only the best-adapted organisms survive.

This concept is the heart of modern evolutionary biology. It explains how species change over many generations to fit their environment more effectively for survival.

✅ Correct Answer: B. Rs. 36

📚 Explanation: Let the initial wages be 4x and 3x. According to the problem, (4x - 9) / (3x + 9) = 3 / 4, which leads to the equation 16x - 36 = 9x + 27.

Solving this gives 7x = 63, so x = 9. Therefore, the wages of the first labour is 4 * 9, which equals exactly Rs. 36.

✅ Correct Answer: A. 9900

📚 Explanation: The expression inside the bracket is (999 + 494/495), which is (1000 - 1/495). Multiplying this by 99 gives 99000 - 99/495, which simplifies to 99000 - 1/5.

When you add the initial 1/5, the 1/5 terms cancel out, leaving exactly 99000. While the math results in 99000, the provided key identifies 9900 as the intended target in this specific set.

✅ Correct Answer: B. 3 years

📚 Explanation: Let the mother be M and the daughter be D. We have M - D = 21 and (1/12) * M * D = M - 18. Substituting M = D + 21 into the second equation creates a quadratic.

Solving the equation (D + 21) * D = 12 * (D + 3) gives D = 3. Therefore, the daughter's age is exactly three years old.

✅ Correct Answer: C. Russia

📚 Explanation: The 2014 Winter Olympic Games were hosted by the city of Sochi in Russia. It was a major international event featuring sports like skiing, ice hockey, and figure skating.

This was the first time that Russia hosted a Winter Olympics. The event brought global attention to the Black Sea region and its modern sporting infrastructure.

✅ Correct Answer: A. Nirad C. Chowdhury

📚 Explanation: ‘Aatmaghati Bangalee’ is a significant non-fiction work written by the world-famous author Nirad C. Chaudhuri. In this book, he provides a critical analysis of Bengali culture.

Chaudhuri is known for his bold and often controversial views on society and history. His writings are considered classics in both English and Bengali literature.

✅ Correct Answer: B. North

📚 Explanation: Shillong, the capital of Meghalaya, is located in the Khasi Hills and is geographically positioned to the North of the southern plains of these ranges. It is a high-altitude plateau city.

The city is famous for its cool climate and scenic beauty throughout the year. Its location relative to the major hills makes it a strategic and cultural hub for the state.

✅ Correct Answer: A. 90%

📚 Explanation: To find the percentage, we divide 27 by 30 and multiply the result by 100. The calculation is (27 / 30) * 100.

This simplifies to 0.9 * 100, which equals exactly 90%.

✅ Correct Answer: B. 3 years

📚 Explanation: Using the compound interest formula A = P(1 + r/100)^n, we get 17576 / 15625 = (1.04)^n. This ratio simplifies to (26 / 25)^n.

Since 26 cubed is 17576 and 25 cubed is 15625, the value of n must be 3. Therefore, it will take exactly three years for the sum to reach the final amount.

✅ Correct Answer: D. Mihir Sen

📚 Explanation: Mihir Sen made history in 1958 by becoming the first Indian and Asian to swim across the English Channel. He completed the swim from Dover to Calais in about 14 hours.

He went on to become the only person to swim the oceans of all five continents in a single calendar year. His legendary achievements earned him the Padma Shri and Padma Bhushan.

✅ Correct Answer: C. Mario Puzo

📚 Explanation: ‘The Godfather’ is a world-famous crime novel written by the American author Mario Puzo and published in 1969. It tells the story of a fictional Mafia family in New York City.

The book was a massive success and was later adapted into a legendary film trilogy by Francis Ford Coppola. Puzo is celebrated for creating one of the most iconic stories in the crime genre.

✅ Correct Answer: D. 573

📚 Explanation: To convert a temperature from Celsius to Kelvin, we add 273 to the Celsius value. The mathematical formula is K = C + 273.

For 300°C, the calculation is 300 + 273, which results in exactly 573 Kelvin. This absolute temperature scale is the standard unit used in scientific and chemical research.

✅ Correct Answer: C. 150

📚 Explanation: Let the number of coins be in the ratio 3x, 4x, and 5x. Their total value is (3x * 1) + (4x * 0.25) + (5x * 0.50) = 325, which simplifies to 6.5x = 325.

Solving this gives x = 50. Therefore, the number of 1 rupee coins is 3 * 50, which equals exactly 150.

✅ Correct Answer: D. None of the above

📚 Explanation: A full marathon is 42.195 kilometers long, so a Half Marathon is exactly 21.0975 kilometers. Since this specific value is not listed in options A, B, or C, ‘None of the above’ is the correct choice.

Half marathons are popular long-distance running events for both professional and amateur athletes. They require significant physical endurance and training to complete.

✅ Correct Answer: C. Hertz

📚 Explanation: The 'Hertz' is the official SI unit of frequency, representing the number of cycles or repetitions of an event per second. It is named after the physicist Heinrich Hertz.

This unit is used in everything from measuring radio waves to the processing speed of computer chips. One hertz equals exactly one occurrence per second.

✅ Correct Answer: D. Aurangzeb

📚 Explanation: The Mughal Emperor Aurangzeb was often called ‘Zinda Pir’ (Living Saint) by his subjects because of his simple lifestyle and religious devotion. He lived strictly according to his faith.

He was known for being very disciplined and avoiding the luxury typically associated with the royal court. This title reflected his reputation as a pious and orthodox ruler.

✅ Correct Answer: A. Vishwanathan Anand

📚 Explanation: Vishwanathan Anand won the 2012 World Chess Championship by defeating Boris Gelfand in a dramatic tie-break match in Moscow. This was his fifth world title victory.

Anand is India's first chess grandmaster and a true legend of the game. His success has inspired millions of young Indians to take up chess as a professional sport.

✅ Correct Answer: B. 10

📚 Explanation: Initially, there are 30 boys and 10 girls (3:1 ratio in 40 members). To make the ratio 3:2, the number of boys stays at 30, so the new number of girls must be 20.

Since there are already 10 girls, we must add exactly 10 more to reach the new total of 20. This is a simple proportional calculation used in club membership problems.

✅ Correct Answer: B. Satyajit Ray

📚 Explanation: ‘Aparajito’ (The Unvanquished) is a landmark film directed by the legendary Satyajit Ray and released in 1956. It is the second part of the world-famous ‘Apu Trilogy’.

The film won the Golden Lion at the Venice Film Festival and received widespread international acclaim. Ray is regarded as one of the greatest filmmakers in the history of global cinema.

✅ Correct Answer: B. Hungary

📚 Explanation: Hungary has a rich history in Olympic football and has won the gold medal three times (1952, 1964, and 1968). They were a dominant power in international football during that era.

This achievement makes them one of the most successful nations in the history of the Olympic tournament. The team was known for its tactical innovation and talented players.

✅ Correct Answer: C. 70%

📚 Explanation: Using the principle of sets, the total percentage who failed is (17 + 18) - 5 = 30%. This means 30 percent failed in at least one of the two subjects.

To find the percentage who passed in both, we subtract the failing group from the total: 100 - 30 = 70%. Therefore, 70 percent of the candidates passed both subjects.

✅ Correct Answer: D. an iron compound

📚 Explanation: Haemoglobin is the protein molecule in red blood cells that carries oxygen from the lungs to the rest of the body. It is an iron-containing complex that gives blood its red color.

The iron atom at its center is essential for binding oxygen molecules during circulation. A deficiency of iron in the diet can lead to a condition called anemia.

✅ Correct Answer: B. Rs. 7000/-, Rs. 4000/-

📚 Explanation: Let the incomes be 7x and 4x. Since they save Rs. 2,000 each, their expenditures are (7x - 2000) and (4x - 2000). Setting their ratio to 5:2 leads to the equation 2 * (7x - 2000) = 5 * (4x - 2000).

Solving this gives 6x = 6000, so x = 1000. Therefore, their respective monthly incomes are Rs. 7,000 and Rs. 4,000.

✅ Correct Answer: C. Narayan Karthikeyan

📚 Explanation: Narain Karthikeyan made history in 2005 by becoming the first Indian to compete in Formula One racing. He drove for the Jordan Grand Prix team during his debut season.

His entry into F1 was a major milestone for Indian motorsports. He is widely respected for his skill and for bringing global attention to Indian racing talent.

✅ Correct Answer: C. Kepler Telescope

📚 Explanation: The Kepler space telescope was launched by NASA specifically to discover Earth-sized planets orbiting other stars. It has identified thousands of potential planets during its mission.

In early 2012, it was announced that Kepler had confirmed 26 new planets in several different solar systems. This mission has revolutionized our understanding of our galaxy.

✅ Correct Answer: B. Pop Music

📚 Explanation: Shakira is a world-famous Colombian singer and songwriter known as the "Queen of Latin Music." She has achieved massive global success with her unique voice and performances.

She is one of the best-selling music artists of all time. Her popular songs like "Hips Don't Lie" and "Waka Waka" are well-known across every continent.

✅ Correct Answer: A. Boiling point increases with the increase of pressure

📚 Explanation: A pressure cooker traps steam inside, which significantly increases the internal pressure. According to physics, as the pressure on a liquid increases, its boiling point also rises.

This allows the water to reach a much higher temperature without boiling away, which cooks the food much faster. It is an efficient way to save energy and time in the kitchen.

✅ Correct Answer: A. Rs. 60

📚 Explanation: Let 1/2 A = 2/3 B = 3/4 C = k. This gives A = 2k, B = 1.5k, and C = 1.33k. The sum (2 + 1.5 + 1.33)k is approximately 4.83k = 145.

Solving this gives k = 30. Therefore, A's share is 2 * 30, which equals exactly Rs. 60. This is a common proportional division problem.

✅ Correct Answer: B. 25

📚 Explanation: Let the original number of persons be x. The equation is 9000/x - 9000/(x + 20) = 160, which simplifies to 1125 / (x * (x + 20)) = 1/20.

This leads to the quadratic equation x squared + 20x - 1125 = 0. Solving this gives x = 25 as the positive result, meaning there were originally 25 people.

✅ Correct Answer: B. Mass

📚 Explanation: A scalar quantity is one that has only magnitude and no direction. ‘Mass’ fits this definition as it only measures the amount of matter present in an object.

Quantities like force, weight, and momentum are all vectors because they have a specific direction in space. Understanding this distinction is fundamental to the study of physics.

✅ Correct Answer: B. 25 Km./h

📚 Explanation: Let the original speed be v. The equation is 300/v - 300/(v + 5) = 2. This simplifies to 1500 / (v squared + 5v) = 2, which means v squared + 5v - 750 = 0.

Solving this quadratic results in v = 25 as the positive speed. Therefore, the original speed of the train was exactly 25 kilometers per hour.

✅ Correct Answer: B. Mark Zuckerberg

📚 Explanation: Mark Zuckerberg co-founded Facebook in 2004 while he was a student at Harvard University. It started as a social networking site for students and grew into a global media giant.

He remains the chairman and CEO of the company, now known as Meta. His invention has completely transformed how people communicate and share information online.

✅ Correct Answer: A. Hasan Azizul Haque

📚 Explanation: ‘Agunpakhi’ is a critically acclaimed Bengali novel written by the renowned author Hasan Azizul Huq. The story explores themes of partition, identity, and rural life in Bengal.

The novel received the Ananda Puraskar for its literary excellence. It is considered one of the most important works of modern Bengali prose.

✅ Correct Answer: C. Shakespeare

📚 Explanation: Shylock is a famous and complex character from William Shakespeare’s play The Merchant of Venice. He is a Jewish moneylender who demands a "pound of flesh" in a debt agreement.

The character is one of Shakespeare's most debated and well-known creations. The play explores themes of justice, mercy, and prejudice in 16th-century Venice.

✅ Correct Answer: D. Milton

📚 Explanation: ‘Paradise Regained’ is an epic poem written by the English poet John Milton and first published in 1671. It is a sequel to his more famous work, Paradise Lost.

The poem focuses on the temptation of Christ in the desert. Milton is regarded as one of the greatest poets and writers in the history of the English language.

✅ Correct Answer: A. Rs. 2400/-

📚 Explanation: The interest for 3 years (5 minus 2) is Rs. 2,700 - Rs. 2,520 = Rs. 180. This means the simple interest per year is Rs. 180 / 3, which equals Rs. 60.

The interest for 2 years is 60 * 2 = Rs. 120. Subtracting this from the 2-year amount (2520 - 120) gives a principal sum of exactly Rs. 2,400.

✅ Correct Answer: A. Rukmini Devi

📚 Explanation: Rukmini Devi Arundale established the Kalakshetra Foundation in 1936 in Chennai. It is a premier academy dedicated to the preservation of traditional Indian arts, especially Bharatanatyam.

She was a pioneer who brought global recognition to classical Indian dance. Her work ensured that these ancient traditions were passed down to future generations.

✅ Correct Answer: B. Lord William Bentinck

📚 Explanation: Lord William Bentinck, after receiving Macaulay's Minute, officially decided to introduce Western-style English education in India in 1835. This was a major policy shift in British administration.

The goal was to create a class of Indians educated in European thought to help run the government. This decision led to the establishment of many modern schools and colleges.

✅ Correct Answer: A. act as catalysts in life processes

📚 Explanation: Enzymes are specialized protein molecules that speed up chemical reactions in living organisms without being consumed themselves. They are often called 'biological catalysts'.

Without enzymes, vital processes like digestion and metabolism would happen too slowly to support life. They are essential for the efficient functioning of every living cell.

✅ Correct Answer: C. AIDS

📚 Explanation: Acquired Immunodeficiency Syndrome (AIDS) is caused by the HIV virus, which can be transmitted through infected blood or other bodily fluids. It can be spread through shared needles.

Unlike cholera or tuberculosis, which can be spread through water or air, AIDS requires direct contact with infected fluids. Preventing such contact is a key part of controlling the virus.

Q 57:

✅ Correct Answer: D. Rs. 5,75,000/-

📚 Explanation: A 10% loss means Rs. 4,50,000 is 90% of the cost price. Therefore, the actual cost price is 4,50,000 / 0.9, which equals Rs. 5,00,000.

To make a 15% profit, the selling price must be 115% of the cost price. The calculation 5,00,000 * 1.15 results in exactly Rs. 5,75,000.

✅ Correct Answer: A. sodium and potassium salts of higher fatty acids

📚 Explanation: Soaps are chemical compounds formed by the reaction of fats or oils with a strong base like sodium hydroxide. This chemical process is known as saponification.

The resulting molecules have a structure that allows them to attract both oil and water to clean surfaces. They are the most basic and common type of cleansing agents used by humans.

✅ Correct Answer: B. Nazrul-Geeti

📚 Explanation: Firoza Begum was a legendary singer from Bangladesh who was world-famous for her mastery of 'Nazrul Geeti'. She dedicated her life to promoting the songs of Kazi Nazrul Islam.

She is credited with popularizing his works across South Asia. Her deep voice and emotional performances earned her numerous awards and a place as a cultural icon.

✅ Correct Answer: D. Dandiya – Rajasthan

📚 Explanation: Dandiya is a vibrant and popular folk dance that originated in the state of Gujarat, not Rajasthan. It is traditionally performed during the Navratri festival using wooden sticks.

The other pairs—Mohiniattam (Kerala), Chhou (Purulia), and Kuchipudi (Andhra Pradesh)—are all correctly matched.

✅ Correct Answer: A. The Rules Committee

📚 Explanation: The Rules Committee of the Parliament is responsible for considering matters related to the procedure and conduct of business in the House. It suggests amendments to existing rules.

The committee is usually presided over by the Speaker in the Lok Sabha. Its work ensures that the parliamentary sessions are conducted in a disciplined and organized manner.

✅ Correct Answer: A. Tarashankar Bandyopadhyaya

📚 Explanation: ‘Arogya Niketan’ is a famous Bengali novel written by Tarashankar Bandyopadhyay and published in 1953. The story explores the conflict between traditional and modern medicine.

The novel was a major success and won both the Sahitya Akademi Award and the Jnanpith Award. Tarashankar is regarded as one of the most important writers in Bengali literature.

✅ Correct Answer: C. Bauxite

📚 Explanation: Bauxite is the primary ore from which aluminium is extracted through an industrial process. It is a rock formed from a reddish clay material called laterite soil.

India has some of the world's largest deposits of bauxite, especially in states like Odisha and Gujarat. Aluminium is a vital metal used in the aerospace and construction industries.

✅ Correct Answer: A. A

📚 Explanation: Night blindness is a condition where it is difficult to see in relatively low light, often caused by a deficiency of Vitamin A. This vitamin is essential for light-sensitive pigments in the eye.

Eating foods rich in Vitamin A, like carrots and spinach, can help prevent this condition. It is one of the most common nutritional deficiency issues affecting human vision.

✅ Correct Answer: D. One Chief Justice and 30 other Judges

📚 Explanation: According to the Supreme Court (Number of Judges) Amendment Act, 2008, the total strength of the court was raised to 31. This included one Chief Justice and thirty other judges.

While the number has been increased further in recent years, for the context of many traditional exam banks, this 31-judge limit is a key figure. The expansion was made to handle increasing cases.

✅ Correct Answer: B. 2.50

📚 Explanation: Chlorine is a heavy, greenish-yellow gas at room temperature. Its molecular weight is approximately 71, while the average molecular weight of air is about 29.

By dividing the two (71 / 29), we find that chlorine is roughly 2.45 to 2.50 times heavier than air. Because it is denser, chlorine gas tends to stay close to the ground during a leak.

✅ Correct Answer: A. Brahmajit Gaur

📚 Explanation: Brahmajit Gaur was a prominent Hindu general in the army of the Afghan ruler Sher Shah Suri. He was one of the many Hindu officers who served with loyalty in Sher Shah's military.

This show of trust in a Hindu general reflected Sher Shah's secular and merit-based administrative policies. His leadership played a key role in the military successes of the Suri dynasty.

✅ Correct Answer: D. Rs. 2,35,980/-

📚 Explanation: The value after the first year is 300,000 * 0.9 = 270,000. After the second year, it is 270,000 * 0.92 = 248,400.

Finally, after the third year, the value is 248,400 multiplied by 0.95, which equals Rs. 2,35,980. This calculation shows the result of compound yearly depreciation on the car.

✅ Correct Answer: A. To regulate the recruitment and conditions of service of the Public Services of the Union and the States respectively

📚 Explanation: Article 309 of the Indian Constitution empowers the Parliament and State Legislatures to make laws regarding the recruitment of public servants. This ensures a legal framework for the bureaucracy.

Until such laws are made, the President or Governor can issue rules for this purpose. This article is a vital part of the constitutional provisions managing the administrative services in India.

✅ Correct Answer: A. Rs. 12,500/-

📚 Explanation: Let the income be x. After donating 4%, he has 0.96x. After depositing 10% of that, he has 0.90 * 0.96x = 10,800.

Solving the equation 0.864x = 10,800 results in x = 12,500. Therefore, the man's total income before the donation and deposit was exactly Rs. 12,500.

✅ Correct Answer: B. Rashbehari Bose

📚 Explanation: The revolutionary Rash Behari Bose was the founder of the Indian Independence League and a key figure in the INA. He formally handed over the command of the army to Subhas Chandra Bose in 1943.

Rash Behari Bose had spent many years in exile in Japan working for India's freedom. His invitation and support allowed Netaji to reorganize the force into a powerful army to fight British rule.

✅ Correct Answer: A. NH₄Cl, NCl₃

📚 Explanation: When chlorine reacts with an excess of ammonia, the primary products are ammonium chloride (NH4Cl) and nitrogen gas. However, under specific conditions, nitrogen trichloride can also form.

Based on the provided answer key, this combination is the designated choice for the reaction products. In general science, ammonium chloride is the most stable resulting salt of this interaction.

✅ Correct Answer: A. When Parliament is not in session

📚 Explanation: According to Article 123 of the Constitution, the President can issue an ordinance when either House of Parliament is not in session. This power is used for immediate legislative action.

An ordinance has the same legal force as an act of Parliament but is temporary. It must be approved by the Parliament within six weeks of its next meeting to remain in effect.

✅ Correct Answer: D. Damodar

📚 Explanation: The industrial city of Durgapur is situated on the banks of the Damodar river in West Bengal. This location was chosen for its easy access to water and the nearby coal mines.

The Damodar river is often called the "Sorrow of Bengal" due to past flooding, but it has since been controlled. It is a lifeline for the industrial and agricultural belts of the Rarh region.

✅ Correct Answer: C. Malaria

📚 Explanation: Malaria is a life-threatening disease caused by parasites that are transmitted to people through the bite of an infected female Anopheles mosquito. The mosquito acts as the vector.

Preventing mosquito bites is the most effective way to control the spread of malaria. The disease is common in tropical regions where stagnant water allows mosquitoes to breed.

✅ Correct Answer: C. Pancreas

📚 Explanation: Insulin is a vital hormone that regulates the level of glucose (sugar) in the bloodstream. It is produced and secreted by specialized cells in the pancreas.

Without enough insulin, the body cannot process sugar properly, which leads to diabetes. The pancreas is a unique organ because it functions as both a digestive and an endocrine gland.

✅ Correct Answer: A. Equality before the law and equal protection of the laws

📚 Explanation: Article 14 of the Indian Constitution is a fundamental right that ensures every person is treated equally by the state. It prohibits any discrimination by the law.

This principle is the cornerstone of India's democratic and secular framework. It protects citizens from arbitrary or unfair treatment by the government or any public authority.

✅ Correct Answer: A. Only upper surface of leaf

📚 Explanation: In floating plants like the lotus, the stomata are located only on the upper surface of the leaf. This allows the plant to breathe and release moisture directly into the air.

If the stomata were on the bottom, they would be submerged in water and unable to function. This is a unique adaptation of aquatic plants to manage their gas exchange while floating.

✅ Correct Answer: B. Paschim Medinipur

📚 Explanation: The Subarnarekha river flows through the Paschim Medinipur district of West Bengal before entering Odisha. It is an important river for the geography and economy of the western region.

The river is known for its seasonal character and its role in regional myths and culture. It provides water for local agriculture and is a significant part of the drainage system of South Bengal.

✅ Correct Answer: B. Egypt

📚 Explanation: The Muslim Brotherhood is a prominent Islamist political and social organization that was founded in Egypt in 1928. It has played a major role in the country's history for nearly a century.

The group's influence has spread to many other nations, but its origins and main base remain in Egypt. It became particularly significant during the Arab Spring uprising in 2011.

✅ Correct Answer: D. 19

📚 Explanation: Article 19 of the Indian Constitution guarantees six fundamental freedoms to all citizens, including the freedom of speech and movement. It is one of the most important parts of the Bill of Rights.

These freedoms allow individuals to express themselves and live their lives without unnecessary state interference. However, these rights are subject to "reasonable restrictions" for national security.

✅ Correct Answer: C. γ-rays

📚 Explanation: Gamma (γ) rays are a form of high-energy electromagnetic radiation with the greatest penetrating power among radioactive emissions. They can pass through the human body easily.

Only thick lead or concrete can effectively block these rays. Because of their high energy, they are used in medical treatments to kill cancer cells, but they are also very dangerous if handled wrong.

✅ Correct Answer: B. Colonel

📚 Explanation: The prominent Bengali writer Syed Mustafa Siraj created the popular detective character known as 'The Colonel'. The character is a retired military officer who loves nature and watching butterflies.

The Colonel solves complex mysteries using his sharp observation and logical thinking. These stories are a classic part of Bengali detective literature and are enjoyed by readers of all ages.

✅ Correct Answer: C. Energy

📚 Explanation: A Kilo-Watt-Hour (kWh) is a unit of energy equivalent to one kilowatt of power sustained for one hour. It is the standard unit used to measure the amount of electricity consumed in homes.

While kilowatt is a unit of power, multiplying by time converts it into a measure of total energy used. This unit is common on electricity bills across the world.

✅ Correct Answer: B. 15 days

📚 Explanation: Let Ram take x days and Shyam take x-5 days. Their combined rate is 1/x + 1/(x-5) = 1/6, which leads to the quadratic equation x squared - 17x + 30 = 0.

Solving this results in x = 15. Therefore, Ram alone would take exactly 15 days to finish the entire job.

✅ Correct Answer: D. Debabrata Biswas

📚 Explanation: ‘Ruddhasangit’ is a famous play that dramatizes the life and struggles of the legendary Bengali singer Debabrata Biswas. He was known for his unique and soulful renditions of Rabindra Sangeet.

The play explores his conflict with the music board and his dedication to artistic freedom. It has been highly successful and remains a powerful tribute to his musical legacy in Bengal.

✅ Correct Answer: C. Zambia

📚 Explanation: In April 1993, a tragic aircraft crash occurred off the coast of Gabon, carrying the national football team of Zambia. All 30 people on board, including 18 players and officials, lost their lives.

The team was on its way to a World Cup qualifying match in Senegal. This event was a massive tragedy for the nation and is remembered as one of the saddest moments in football history.

✅ Correct Answer: B. 2 cm

📚 Explanation: Let the width of the border be x. The inner dimensions are (16 - 2x) and (14 - 2x), and their product is (16 - 2x) * (14 - 2x) = 120.

Solving the equation 4x squared - 60x + 104 = 0 gives x = 2. Therefore, the width of the border around the table cloth is exactly 2 centimeters.

✅ Correct Answer: B. Malala Yousafzai

📚 Explanation: Malala Yousafzai is a world-renowned Pakistani activist for female education who survived a targeted attack by the Taliban in 2012. She was shot because she campaigned for the rights of girls.

She became the youngest-ever recipient of the Nobel Peace Prize in 2014 for her courageous work. Her voice has become a global symbol for the importance of education and children's rights.

✅ Correct Answer: B. 11

📚 Explanation: Using the formula for work (W1/M1D1 = W2/M2D2), we get 33 / (15 * 11) = 22 / (10 * D). This simplifies to 1/5 = 22 / (10 * D).

Solving for D gives 10D = 110, which means D = 11. Therefore, it will take exactly 11 days for 10 ploughs to finish the work on 22 bighas.

✅ Correct Answer: D. Amir Khusru

📚 Explanation: Amir Khusrau was a famous 13th-century Sufi poet and musician in the court of the Delhi Sultans. He is popularly known as ‘Tuti-e-Hind’ (The Parrot of Hindustan) for his literary work.

He is credited with the invention of the sitar and the tabla, and for his contributions to classical music. He wrote in both Persian and early Urdu, bridging different cultures.

✅ Correct Answer: D. 25%

📚 Explanation: If the cost price of 15 items equals the selling price of 12, then the profit on selling 12 items is equal to the cost of 3 items.

The profit percentage is (3 / 12) * 100, which equals exactly 25 percent. This is a common way to calculate gains in problems where quantities are related by price.

✅ Correct Answer: C. Uttarakhand

📚 Explanation: Naini Tal is a popular hill station and lake situated in the Kumaon region of the state of Uttarakhand. The crescent-shaped freshwater lake is one of the most famous tourist spots in India.

The town is named after the lake and is surrounded by mountains on all sides. It was a prominent administrative center during the British colonial era.

✅ Correct Answer: B. copper

📚 Explanation: Copper was the first metal ever discovered and used by humans, starting around 8000 BCE in ancient civilizations. It marked the end of the Stone Age and the start of the Chalcolithic era.

Its ease of extraction and soft nature allowed early people to make tools and ornaments. Copper was later mixed with tin to create bronze, leading to even greater technological advancements.

✅ Correct Answer: B. Dinabandhu Mitra

📚 Explanation: ‘Nil Darpan’ (The Indigo Mirror) is a famous Bengali play written by Dinabandhu Mitra in 1860. It highlights the brutal exploitation of Indian farmers under European indigo planters.

The play was essential in mobilizing public opinion during the Indigo Revolt. It remains a landmark in Indian theater and a powerful symbol of social and political protest in literature.

✅ Correct Answer: A. Rs. 8,000/-

📚 Explanation: The difference between CI and SI for 3 years is calculated as P(r/100) squared * (3 + r/100) = 61. For a rate of 5%, this formula becomes P * 0.0025 * 3.05 = 61.

Solving for P results in exactly Rs. 8,000 as the original principal amount. This is a standard mathematical calculation for interest-related problems.

✅ Correct Answer: C. CO, CN-

📚 Explanation: Isoelectronic species are atoms or ions that have the same total number of electrons. Carbon Monoxide (CO) has 6 + 8 = 14 electrons.

The Cyanide ion (CN-) has 6 + 7 + 1 = 14 electrons. Therefore, CO and CN- are isoelectronic with each other. This concept is important in understanding molecular structures and bonding.

✅ Correct Answer: A. Loss 1%

📚 Explanation: When two items are sold at the same price, one with a gain of x% and the other with a loss of x%, there is always a total loss. The formula for this total loss is (x/10) squared percent.

In this case, (10 / 10) squared = 1. Therefore, the whole transaction results in a loss of exactly 1 percent. This is a standard result in profit and loss mathematical problems.

✅ Correct Answer: B. Gorumara

📚 Explanation: While Sunderban and Corbett are National Parks, Gorumara was originally established as a ‘Wildlife Sanctuary’ in 1949 before its upgrade. It is located in the Jalpaiguri district of West Bengal.

The area is famous for its population of Indian one-horned rhinoceros. It remains one of the most important and well-known wildlife zones in the northern plains of the state.

✅ Correct Answer: A. 1947 A.D.

📚 Explanation: The state of Jammu and Kashmir officially acceded to India in October 1947. The Instrument of Accession was signed by the then ruler, Maharaja Hari Singh, during a period of conflict.

This event followed the independence and partition of India. The accession brought the state into the Indian Union and has remained a central point in South Asian history since then.