General knowledge MCQ – Change your future

641. Which of these is a biodegradable polymer?

Correct Answer: Correct answer is: (D) All of the above.

Exam Relevance: MCAT, GRE Chemistry, Undergraduate Chemistry Exams

Difficulty: Moderate

Concept notes: Biodegradable polymers are materials that can be broken down by biological processes into natural substances. PLA (Polylactic Acid), PCL (Polycaprolactone), and PGA (Polyglycolic Acid) are all examples of biodegradable polymers used in various applications, including medical implants and packaging.

Common Mistakes: Students may mistakenly believe that only one of these polymers is biodegradable, or they may not be familiar with all three.

Explanations: PLA, PCL, and PGA are all biodegradable polymers. PLA is derived from renewable resources like corn starch and sugarcane, and it degrades into lactic acid. PCL is a synthetic polymer that degrades into caprolactone monomers. PGA is a synthetic polymer that degrades into glycolic acid. All three are used in biomedical applications due to their biodegradable properties.

Option Analysis:

Option A: PLA is a biodegradable polymer.
Option B: PCL is a biodegradable polymer.
Option C: PGA is a biodegradable polymer.
Option D: All of the above are biodegradable polymers.

Mnemonic: PLA, PCL, PGA: All degrade, so D is key.

642. What alphabet is used for Russian? [SSC CPO Examination-2016]

Correct Answer: Correct answer is: (C) Cyrillic.

Exam Relevance: SSC CPO, UPSC, Bank PO, CLAT

Difficulty: Easy

Concept notes: The Cyrillic alphabet is used for writing Russian.

Common Mistakes: Students may confuse the Cyrillic alphabet with other alphabets like Arabic, Greek, or Hebrew, which are used for different languages.

Explanations: The Cyrillic alphabet is the writing system used for the Russian language. It was developed in the First Bulgarian Empire during the 9th century and is derived from the Greek alphabet. The Cyrillic alphabet is distinct from other alphabets such as Arabic, Greek, and Hebrew, which are used for different languages.

Option Analysis:

Option A: Arabic is used for writing Arabic and some other languages, not Russian.
Option B: Greek is used for writing Greek and some other languages, not Russian.
Option C: Cyrillic is the correct alphabet used for writing Russian.
Option D: Hebrew is used for writing Hebrew and some other languages, not Russian.

Mnemonic: Cyrillic for Russian, like Cyrillic for Czar.

643. A lunar eclipse only happens during a ..... moon. [Indian Defence Accounts Service (IDAS) Examination-2014]

Correct Answer: Correct answer is: (D) Full.

Exam Relevance: Indian Defence Accounts Service (IDAS), UPSC, Civil Services

Difficulty: Easy

Concept notes: A lunar eclipse occurs when the Earth is positioned between the Sun and the Moon, casting a shadow on the Moon.

Common Mistakes: Students may confuse lunar eclipses with solar eclipses, which occur during a new moon.

Explanations: A lunar eclipse can only happen during a full moon because the Moon must be on the opposite side of the Earth from the Sun to be fully illuminated and fall into the Earth's shadow.

Option Analysis:

Option A: A new moon occurs when the Moon is between the Earth and the Sun, making it impossible for a lunar eclipse to occur.
Option B: A crescent moon is a phase where only a portion of the Moon is illuminated, not a full moon, so a lunar eclipse cannot occur.
Option C: A gibbous moon is a phase where more than half but not all of the Moon is illuminated, not a full moon, so a lunar eclipse cannot occur.
Option D: A full moon is when the entire face of the Moon is illuminated, and this is the only phase where a lunar eclipse can occur.

Mnemonic: Remember: "Full Moon, Full Shadow."

644. The function of hemoglobin is [Maharashtra Department Excise Examination-1992]

Correct Answer: Correct answer is: (D) Transportation of oxygen.

Exam Relevance: NEET, AIIMS, GATE, GRE

Difficulty: Easy

Concept notes: Hemoglobin is a protein in red blood cells that binds to oxygen and transports it throughout the body.

Common Mistakes: Students may confuse the function of hemoglobin with other roles of blood components, such as the role of white blood cells in fighting infections.

Explanations: Hemoglobin is a crucial protein found in red blood cells. Its primary function is to bind to oxygen in the lungs and transport it to tissues throughout the body. This process is essential for cellular respiration and energy production. The other options are incorrect because utilization of energy is not a function of hemoglobin, prevention of anemia is a consequence of having sufficient hemoglobin, and destruction of bacteria is a function of white blood cells, not hemoglobin.

Option Analysis:

Option A: Utilization of energy is not a function of hemoglobin.
Option B: Prevention of anemia is a consequence of having sufficient hemoglobin, not its function.
Option C: Destruction of bacteria is a function of white blood cells, not hemoglobin.
Option D: Transportation of oxygen is the correct function of hemoglobin.

Mnemonic: Hemoglobin: "H" for "Hauling" oxygen.

645. FISHES HAVE SPECIAL RESPIRATORY ORGAN CALLED [Delhi Andaman and Nicobar Islands Police Service (DANIPS) Examination-2021]

Correct Answer: Correct answer is: (C) GILLS.

Exam Relevance: Delhi Andaman and Nicobar Islands Police Service (DANIPS), Civil Services, State Police Services

Difficulty: Easy

Concept notes: Fish have specialized respiratory organs called gills that allow them to extract oxygen from water.

Common Mistakes: Students may confuse gills with lungs, which are used by terrestrial animals for breathing air.

Explanations: Fish extract oxygen from water using gills, which are specialized organs designed to facilitate gas exchange in an aquatic environment. Gills are highly efficient at extracting dissolved oxygen from water, making them essential for the survival of fish.

Option Analysis:

Option A: Fins are appendages used for movement and stability, not for respiration.
Option B: Lungs are respiratory organs used by terrestrial animals to breathe air, not by fish.
Option C: Gills are the specialized respiratory organs in fish that extract oxygen from water.
Option D: This option is incorrect as gills are the correct respiratory organs for fish.

Mnemonic: Gills for Gills, not Lungs for Land.

646. Charminar in Hyderabad was constructed in commemoration of elimination of which disease? [DRDO Examination-1994]

Correct Answer: Correct answer is: (B) Plague.

Exam Relevance: DRDO Examination, UPSC, SSC, Civil Services

Difficulty: Moderate

Concept notes: The Charminar, a monument located in Hyderabad, India, was constructed by Muhammad Quli Qutb Shah in 1591. It was built to commemorate the end of a devastating plague that had affected the region.

Common Mistakes: Students may confuse the historical context of the Charminar with other significant events or diseases, such as polio or cancer, which are more contemporary issues.

Explanations: Muhammad Quli Qutb Shah, the fifth ruler of the Qutb Shahi dynasty, built the Charminar to mark the end of a plague that had ravaged the city of Hyderabad. The monument symbolizes the relief and gratitude of the people after the plague was eradicated.

Option Analysis:

Option A: Polio is a disease that has been eradicated in many parts of the world, but it was not the reason for the construction of the Charminar.
Option B: Plague is the correct answer as it was the disease that affected Hyderabad during the time of the Charminar's construction.
Option C: Cancer is a modern disease and was not a significant issue during the time of the Charminar's construction.
Option D: Leprosy, while a historical disease, was not the reason for the construction of the Charminar.

647. What happened after India was freed and split up? [Jharkhand PSC Examination-2022]

Correct Answer: Correct answer is: (C) Violence broke out between the two groups of people.

Exam Relevance: UPSC, SSC, Jharkhand PSC

Difficulty: Moderate

Concept notes: The partition of India in 1947 led to significant communal violence between Hindus and Muslims.

Common Mistakes: Students may mistakenly believe that the partition was peaceful or that the British returned to maintain order.

Explanations: After India's independence and partition in 1947, the division of the subcontinent into India and Pakistan led to widespread communal violence. This violence was primarily between Hindus and Muslims, resulting in mass migrations and significant loss of life. The partition was not peaceful, and the British did not return to manage the situation.

Option Analysis:

Option A: This is incorrect as the partition was not peaceful and did not result in a harmonious separation of Hindus and Muslims.
Option B: This is incorrect as Gandhi did not move to Pakistan; he remained in India and worked towards communal harmony.
Option C: This is correct as violence did break out between Hindus and Muslims following the partition.
Option D: This is incorrect as the British did not return to India after the partition.

Mnemonic: Partition, Violence, 1947

648. PSLV is also known as ..... [Jharkhand Postal Circle Examination-2001]

Correct Answer: Correct answer is: (A) Horsepower of India.

Exam Relevance: UPSC, SSC, Banking Exams, Railway Exams

Difficulty: Easy

Concept notes: PSLV, or Polar Satellite Launch Vehicle, is often referred to as the "Horsepower of India" due to its reliability and frequent use in launching satellites.

Common Mistakes: Students might confuse PSLV with other launch vehicles or not be familiar with the nickname.

Explanations: PSLV is known as the "Horsepower of India" because of its consistent success rate and frequent use in launching satellites. This nickname reflects its reliability and importance in India's space program.

Option Analysis:

Option A: Correct. PSLV is often referred to as the "Horsepower of India."
Option B: Incorrect. "Strength of India" is not a common nickname for PSLV.
Option C: Incorrect. Only Option A is correct.
Option D: Incorrect. Option A is correct.

649. Which is the 4th prime number? [Assam PSC Examination-1988]

Correct Answer: Correct answer is: (C) 7.

Exam Relevance: SSC, UPSC, GRE, GMAT

Difficulty: Very Easy

Concept notes: The sequence of prime numbers starts with 2, 3, 5, 7, 11, and so on. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Common Mistakes: Students may confuse the sequence of prime numbers or mistakenly include non-prime numbers in the sequence.

Explanations: The first prime number is 2, the second is 3, the third is 5, and the fourth is 7. Therefore, the 4th prime number is 7.

Option Analysis:

Option A: 5 is the third prime number, not the fourth.
Option B: 4 is not a prime number as it is divisible by 2.
Option C: 7 is the fourth prime number.
Option D: 11 is the fifth prime number, not the fourth.

Mnemonic: Prime sequence: 2, 3, 5, 7, 11, "235711" (like a secret code).

650. Who was the founder of Jainism? [SSC Stenographer Examination-2012]

Correct Answer: Correct answer is: (D) Mahavira.

Exam Relevance: SSC, UPSC, Civil Services, Bank PO

Difficulty: Easy

Concept notes: Mahavira is recognized as the founder of Jainism, a religion that emphasizes non-violence and the path to liberation through self-discipline and non-attachment.

Common Mistakes: Students may confuse Mahavira with other religious figures such as Buddha or Guru Nanak Dev ji, who are associated with Buddhism and Sikhism, respectively.

Explanations: Mahavira, also known as Vardhamana, is the 24th and last Tirthankara (spiritual teacher) in Jainism. He lived in the 6th century BCE and is credited with reforming and consolidating the teachings of Jainism. The other options are incorrect as they are associated with different religions: Buddha with Buddhism, Abraham with Abrahamic religions, and Guru Nanak Dev ji with Sikhism.

Option Analysis:

Option A: Buddha is the founder of Buddhism, not Jainism.
Option B: Abraham is a significant figure in Abrahamic religions, not Jainism.
Option C: Guru Nanak Dev ji is the founder of Sikhism, not Jainism.
Option D: Mahavira is the correct founder of Jainism.

Mnemonic: Mnemonic: "M for Mahavira, M for Mahatma, M for Monasticism."

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General knowledge MCQ - Set 65

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