Odisha LTR Teacher Recruitment Mock Test
Full Mock Test covering Odisha GK, History, Arithmetic, Reasoning, Computer Literacy & Science.
OSSC LTR Teacher Recruitment — Mock Test 01
Total Questions: 100 | Total Marks: 100 | Negative Marking: 0.25 Mark
Tap "Show Answer & Explanation" under each question to verify your answers instantly.
1. Who was the legendary builder-architect credited with fixing the crowning stone (Dadhinauti) of the Konark Sun Temple?
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Correct Answer: B) Dharmapada
Explanation: According to legend, 12-year-old Dharmapada, son of head mason Bisu Maharana, completed the temple's structural placement before sacrificing himself to preserve the lives of the 1,200 craftsmen.
2. In which year was the historic Battle of Buxar fought, which eventually led to the British acquisition of the Diwani rights including parts of Bengal, Bihar, and Odisha?
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Correct Answer: C) 1764
Explanation: The Battle of Buxar was fought on 22 October 1764, culminating in the Treaty of Allahabad (1765) granting the British East India Company Diwani revenue collection rights.
3. Which national park/wildlife sanctuary in Odisha is internationally famed as the world’s largest mass nesting rookery (Arribada) for Olive Ridley sea turtles?
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Correct Answer: A) Gahirmatha Marine Sanctuary
Explanation: Gahirmatha Marine Sanctuary in Kendrapara district is the largest mass nesting site (Arribada) in the world for vulnerable Olive Ridley turtles.
4. Who was the first Chief Justice of the Orissa High Court when it was established in 1948?
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Correct Answer: B) Justice Bira Kishore Ray
Explanation: Justice Bira Kishore Ray served as the inaugural Chief Justice of the Orissa High Court starting July 26, 1948.
5. Which article of the Constitution of India empowers the President to grant pardons, reprieves, respites, or remissions of punishment?
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Correct Answer: B) Article 72
Explanation: Article 72 gives the President pardoning power for court-martial sentences, offenses against union laws, and death penalties.
6. The famous 'Bara Bati Fort' at Cuttack was initially constructed in the 13th century by which Ganga ruler?
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Correct Answer: A) Anangabhima Deva III
Explanation: King Anangabhima Deva III built the Barabati fort on the banks of the Mahanadi river in Cuttack around 1229 CE.
7. The Panchayati Raj System in Odisha was granted three-tier statutory status following which Constitutional Amendment?
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Correct Answer: C) 73rd Amendment
Explanation: The 73rd Constitutional Amendment Act, 1992 constitutionalized the three-tier Panchayati Raj institutions (Gram Panchayat, Panchayat Samiti, and Zilla Parishad).
8. What is the length of the Odisha coastline along the Bay of Bengal?
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Correct Answer: B) Approximately 485 km
Explanation: Odisha has a coastline extending roughly 480 to 485 kilometers spanning six coastal districts.
9. Who was known as 'Kabi Samrata' in the history of classical Odia literature?
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Correct Answer: A) Upendra Bhanja
Explanation: Upendra Bhanja was conferred the title 'Kabi Samrata' (Emperor of Poets) for his poetic masterpieces like Baidehisa Bilasa and Labanyabati.
10. Which tier of the judiciary in India has original jurisdiction over inter-state water disputes?
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Correct Answer: B) Inter-State Tribunals set up under Article 262
Explanation: Article 262 permits Parliament to enact laws (such as the Inter-State River Water Disputes Act 1956) providing tribunals that bar the jurisdiction of civil courts.
11. In which district of Odisha is the famous iron ore producing region 'Joda-Barbil' located?
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Correct Answer: B) Keonjhar (Kendujhar)
Explanation: The Joda-Barbil belt in Keonjhar is one of the richest iron ore and manganese mining belts in India.
12. Which dynasty constructed the renowned Lingaraj Temple in Bhubaneswar?
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Correct Answer: B) Somavamshi (Keshari) Dynasty
Explanation: Lingaraj Temple was commissioned by King Yayati I (Yayati Keshari) and completed by Lalatendu Keshari of the Somavamshi dynasty in the 11th century.
13. Which Article of the Indian Constitution prohibits discrimination on grounds of religion, race, caste, sex, or place of birth?
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Correct Answer: B) Article 15
Explanation: Article 15 specifically prohibits discrimination against any citizen on grounds of religion, race, caste, sex, or birthplace.
14. The famous hot sulfur spring 'Atri' is located in which district of Odisha?
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Correct Answer: C) Khordha
Explanation: Atri hot sulfur spring is situated near Baghamari in the Khordha district, noted for its constant 57°C medicinal waters.
15. Who started the historic Odia weekly newspaper 'The Samaj' in 1919?
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Correct Answer: A) Utkalamani Pandit Gopabandhu Das
Explanation: Gopabandhu Das founded 'The Samaj' from Satyabadi in Puri district on October 4, 1919.
16. The Council of Ministers in a State is collectively responsible to which institution?
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Correct Answer: B) The Legislative Assembly (Vidhan Sabha)
Explanation: Under Article 164(2) of the Indian Constitution, the State Council of Ministers is collectively responsible to the Legislative Assembly.
17. Which tribe of Odisha is particularly identified with the sacred Dongria Kondh settlement in the Niyamgiri hills?
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Correct Answer: A) Dongria Kondh
Explanation: The Dongria Kondh are a Particularly Vulnerable Tribal Group (PVTG) who revere the Niyamgiri hill ranges across Rayagada and Kalahandi.
18. Who wrote the famous patriotic poem 'Bande Utkala Janani', the official state anthem of Odisha?
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Correct Answer: C) Kantakabi Laxmikanta Mohapatra
Explanation: Kantakabi Laxmikanta Mohapatra composed 'Bande Utkala Janani' in 1912, which was officially adopted as the Odisha State Anthem in 2020.
19. Which dam in Odisha is built across the Ib river tributary system in Sundargarh district?
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Correct Answer: A) Mandira Dam
Explanation: Mandira Dam is built across the Sankh River near Rourkela in Sundargarh to supply water to the Rourkela Steel Plant.
20. Under which Article of the Constitution can Parliament admit or establish new States?
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Correct Answer: B) Article 2
Explanation: Article 2 empowers Parliament to admit into the Union, or establish, new States on terms and conditions it thinks fit.
21. The famous peasant uprising 'Prajamandal Andolan' in the feudatory princely state of Dhenkanal (1938) witnessed the supreme sacrifice of 12-year-old martyr:
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Correct Answer: A) Baji Rout
Explanation: Baji Rout, India’s youngest freedom martyr, was shot dead by British police at Nilakanthapur ghat in Dhenkanal when he refused to ferry them across the Brahmani river.
22. Who among the following appoints the Chairman and members of the Odisha Public Service Commission (OPSC)?
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Correct Answer: B) Governor of Odisha
Explanation: Under Article 316, the Governor appoints the Chairman and members of a State PSC, though they can only be removed by the President of India.
23. Which district of Odisha has the highest forest cover in terms of total geographical area?
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Correct Answer: A) Kandhamal
Explanation: In terms of forest area as a percentage of total geographical area, Kandhamal ranks first with over 65% forest canopy.
24. In the Indian Constitution, the concept of 'Single Citizenship' is borrowed from which country?
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Correct Answer: C) United Kingdom (Britain)
Explanation: India adopted single unified citizenship across the union from the British constitutional model.
25. The tribal rebellion led by Veer Surendra Sai was primarily centered in which region of Odisha?
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Correct Answer: B) Sambalpur
Explanation: Veer Surendra Sai led an armed resistance from 1827 to 1862 against British encroachment and the doctrine of lapse in Sambalpur.
26. What is the retirement age for judges of the High Court in India?
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Correct Answer: B) 62 years
Explanation: High Court judges retire at 62 years, while Supreme Court judges retire at 65 years.
27. The National Aluminium Company Limited (NALCO) operates its massive bauxite mine at which hill in Odisha?
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Correct Answer: A) Panchpatmali (Koraput)
Explanation: NALCO’s opencast bauxite mine is situated on the Panchpatmali plateau in Koraput district.
28. Who presided over the historic All India Congress Committee session in Bombay when the 'Quit India' Resolution was passed on August 8, 1942?
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Correct Answer: B) Maulana Abul Kalam Azad
Explanation: Maulana Abul Kalam Azad was Congress President during the momentous August 1942 session at Gowalia Tank Maidan.
29. The famous terracotta craft of Subarnapur and Barapali is traditionally practiced in which geographical area of Western Odisha?
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Correct Answer: A) Sonepur & Bargarh
Explanation: Subarnapur (Sonepur) and Barapali in Bargarh are centers for roof-tile terracotta and clay art figurines.
30. Which constitutional organ in India audits the receipts and expenditure of the Union and State governments?
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Correct Answer: C) Comptroller and Auditor General (CAG)
Explanation: Article 148–151 empowers the CAG to audit all public expenditure of both Central and State entities.
31. What is the greatest four-digit number that is completely divisible by 15, 20, and 25?
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Correct Answer: C) 9900
Explanation: LCM of 15, 20, 25 = 300. Largest 4-digit number = 9999. Dividing 9999 by 300 gives remainder 99. 9999 - 99 = 9900.
32. If A's salary is 25% more than B's salary, then by what percentage is B's salary less than A's salary?
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Correct Answer: A) 20%
Explanation: Formula: [r / (100 + r)] × 100 = [25 / 125] × 100 = 1/5 × 100 = 20%.
33. A shopkeeper sells an article for ₹840 at a gain of 12%. What was its cost price?
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Correct Answer: B) ₹750
Explanation: CP = SP / (1 + Profit%) = 840 / 1.12 = ₹750.
34. In what time will ₹4000 amount to ₹5200 at 6% simple interest per annum?
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Correct Answer: C) 5 years
Explanation: SI = 5200 - 4000 = ₹1200. Time = (SI × 100) / (P × R) = (1200 × 100) / (4000 × 6) = 120000 / 24000 = 5 years.
35. Find the mean proportional between 9 and 25.
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Correct Answer: B) 15
Explanation: Mean proportional = √(a × b) = √(9 × 25) = 3 × 5 = 15.
36. Pipe X can fill a tank in 8 hours and Pipe Y can empty it in 12 hours. If both pipes are opened together, how long will it take to fill the tank?
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Correct Answer: B) 24 hours
Explanation: Net rate per hour = 1/8 - 1/12 = (3 - 2)/24 = 1/24. Time required = 24 hours.
37. The average weight of 8 persons increases by 2.5 kg when a new person replaces someone weighing 65 kg. What is the weight of the new person?
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Correct Answer: C) 85 kg
Explanation: Weight of new person = Replaced weight + (Total count × increase) = 65 + (8 × 2.5) = 65 + 20 = 85 kg.
38. A car covers a distance of 180 km in 3 hours. If its speed is decreased by 15 km/h, what time will it take to cover the same distance?
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Correct Answer: B) 4 hours
Explanation: Original speed = 180 / 3 = 60 km/h. New speed = 60 - 15 = 45 km/h. New time = 180 / 45 = 4 hours.
39. Two numbers are in the ratio 3:4. If their LCM is 180, what is the sum of the two numbers?
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Correct Answer: C) 105
Explanation: Let numbers be 3x and 4x. LCM = 12x = 180 ⇒ x = 15. The numbers are 45 and 60. Sum = 45 + 60 = 105.
40. A rectangular lawn 40 m by 30 m has a walking path 2 m wide running inside around its border. Find the area of the path.
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Correct Answer: A) 264 m²
Explanation: Total area = 40 × 30 = 1200 m². Inner dimensions = (40 - 4) = 36 m and (30 - 4) = 26 m. Inner area = 36 × 26 = 936 m². Path area = 1200 - 936 = 264 m².
41. If 12 men or 18 women can construct a wall in 14 days, in how many days can 8 men and 16 women construct the same wall?
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Correct Answer: B) 9 days
Explanation: 12 men = 18 women ⇒ 1 man = 1.5 women. 8 men + 16 women = (8 × 1.5) + 16 = 28 women. Days = (18 × 14) / 28 = 9 days.
42. The perimeter of a semi-circle is 72 cm. Find its diameter (Take π = 22/7):
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Correct Answer: C) 28 cm
Explanation: Perimeter = πr + 2r = r(22/7 + 2) = r(36/7) = 72 ⇒ r = (72 × 7)/36 = 14 cm. Diameter = 2r = 28 cm.
43. If a sum of ₹16000 yields compound interest of ₹2522 in 9 months compounded quarterly, what is the annual interest rate?
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Correct Answer: C) 20%
Explanation: Amount = 16000 + 2522 = ₹18522. Time = 9 months = 3 quarters. 18522/16000 = (1 + r/400)³ ⇒ 9261/8000 = (21/20)³. Quarterly rate = 1/20 = 5%. Annual rate = 5% × 4 = 20%.
44. What is the simplified value of: (0.04)⁻¹·⁵?
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Correct Answer: B) 125
Explanation: 0.04 = 4/100 = 1/25 = (1/5)². (5⁻²)⁻¹·⁵ = 5³ = 125.
45. A person travels 1/3 of his journey at 20 km/h, 1/3 at 30 km/h, and the remaining 1/3 at 60 km/h. What is his average speed for the entire trip?
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Correct Answer: A) 30 km/h
Explanation: Harmonic mean of equal segments: 3 / (1/20 + 1/30 + 1/60) = 3 / [(3 + 2 + 1)/60] = 3 / (6/60) = 3 / (1/10) = 30 km/h.
46. By selling 33 meters of cloth, a merchant gains the cost price of 11 meters. His gain percentage is:
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Correct Answer: B) 33.33%
Explanation: Profit = CP of 11 m. Total CP = CP of 33 m. Profit % = (11 / 33) × 100 = 33.33%.
47. The volume of a cylinder is 448π cm³ and its height is 7 cm. Find its curved surface area.
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Correct Answer: A) 112π cm²
Explanation: Volume = πr²h = 448π ⇒ r²(7) = 448 ⇒ r² = 64 ⇒ r = 8 cm. CSA = 2πrh = 2 × π × 8 × 7 = 112π cm².
48. What is the units digit in the product: (7⁹⁵ - 3⁵⁸)?
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Correct Answer: B) 4
Explanation: 95 mod 4 = 3 ⇒ 7³ has unit digit 3. 58 mod 4 = 2 ⇒ 3² has unit digit 9. Unit digit = (13 - 9) = 4.
49. The ratio of milk and water in a 40-liter mixture is 3:1. How much water must be added to make the ratio 2:1?
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Correct Answer: B) 5 liters
Explanation: Initial: Milk = 30 L, Water = 10 L. Let x liters of water be added: 30 / (10 + x) = 2/1 ⇒ 20 + 2x = 30 ⇒ 2x = 10 ⇒ x = 5 liters.
50. If a sum invested at simple interest amounts to ₹750 in 3 years and ₹850 in 5 years, find the original sum.
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Correct Answer: B) ₹600
Explanation: SI for 2 years = 850 - 750 = ₹100 ⇒ SI for 1 year = ₹50. SI for 3 years = 50 × 3 = ₹150. Principal = 750 - 150 = ₹600.
51. If 'A + B' means A is the brother of B, 'A - B' means A is the sister of B, and 'A × B' means A is the father of B, what does 'P × Q - R' signify?
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Correct Answer: B) P is the father of R
Explanation: P × Q means P is the father of Q. Q - R means Q is the sister of R. Therefore, P is the father of both Q and R.
52. In a code language, CERTAIN is coded as XVIGZRM. How is REQUIRED coded in that system?
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Correct Answer: A) IVJFRIVW
Explanation: Opposite alphabet letter substitution (sum of letter places = 27): R(18)↔I(9), E(5)↔V(22), Q(17)↔J(10), U(21)↔F(6), I(9)↔R(18), R(18)↔I(9), E(5)↔V(22), D(4)↔W(23).
53. What is the missing number in the series: 3, 8, 18, 38, 78, ?
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Correct Answer: C) 158
Explanation: Rule: (n × 2) + 2. (3×2)+2=8; (8×2)+2=18; (18×2)+2=38; (38×2)+2=78; (78×2)+2 = 156 + 2 = 158.
54. Select the related word: Ophthalmic : Eye :: Orthopedic : ?
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Correct Answer: C) Bones
Explanation: Ophthalmology deals with eyes; orthopedics deals with bones and musculoskeletal systems.
55. A man walks 10 km South, turns left and walks 12 km, then turns left again and walks 10 km. How far is he from his initial point?
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Correct Answer: B) 12 km
Explanation: Moving 10 km South and 10 km North cancels vertical travel, leaving him 12 km East of his origin.
56. Statements: All mangoes are golden. All golden fruits are sweet.
Conclusions: I. All mangoes are sweet. II. All sweet things are mangoes.
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Correct Answer: A) Only conclusion I follows
Explanation: Mangoes are a subset of sweet fruits. The reverse is an illicit conversion that cannot be verified universally.
57. Which of the following words will appear third when arranged in alphabetical order (as in a dictionary)?
1. Candid 2. Candidate 3. Candle 4. Canine
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Correct Answer: C) Candle
Explanation: Alphabetical order: 1. Candid → 2. Candidate → 3. Candle → 4. Canine.
58. What will be the reflex angle between the hands of a clock at 4:40?
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Correct Answer: B) 260°
Explanation: Angle = |30H - 11/2 M| = |30(4) - (11/2)(40)| = |120 - 220| = 100°. Reflex angle = 360° - 100° = 260°.
59. Find the odd one out from the options:
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Correct Answer: D) 144
Explanation: 27 (3³), 64 (4³), and 125 (5³) are perfect cubes. 144 is a square (12²), but not a whole-number cube.
60. In a queue, Priya is 11th from the front and Swati is 16th from the back. If they interchange places, Priya becomes 21st from the front. How many persons are in the queue?
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Correct Answer: B) 36
Explanation: Total = Priya’s new position + Swati’s original position - 1 = 21 + 16 - 1 = 36.
61. If January 1, 2024 was a Monday, what day of the week was December 31, 2024 (2024 being a leap year)?
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Correct Answer: B) Tuesday
Explanation: A leap year has 366 days (52 weeks + 2 odd days). If it starts on Monday, the 366th day is the next day of the week, which is Tuesday.
62. Complete the letter pattern: ab_ba_b_ba_b
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Correct Answer: A) baab
Explanation: Repeating quad pattern 'abba | abba | abba'. Missing slots filled with 'b, a, a, b'.
63. Which of the following Venn diagrams best depicts the relationship between: Doctors, Surgeons, Teachers?
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Correct Answer: A) All Surgeons are Doctors, with Teachers overlapping both
Explanation: All surgeons belong inside the doctor classification, while some doctors/surgeons can also be professors/teachers.
64. If RED is coded as 27 and BLUE is coded as 40, what is the code for GREEN?
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Correct Answer: B) 49
Explanation: Sum of alphabet places: G(7) + R(18) + E(5) + E(5) + N(14) = 49.
65. Introducing a man, Anita said, "His wife is the only daughter of my father." How is the man related to Anita?
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Correct Answer: B) Husband
Explanation: "The only daughter of my father" refers to Anita herself. Hence, his wife is Anita, meaning the man is her husband.
66. Find the next term in the alphanumeric series: C2E, F5H, I8K, ?
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Correct Answer: A) L11N
Explanation: First letter: C(+3)→F(+3)→I(+3)→L. Number: 2(+3)→5(+3)→8(+3)→11. Last letter: E(+3)→H(+3)→K(+3)→N. Term = L11N.
67. How many quadrilaterals (rectangles/squares) can be counted in a standard 2 × 2 grid?
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Correct Answer: C) 9
Explanation: Formula: [n(n+1)/2] × [m(m+1)/2] = [2(3)/2] × [2(3)/2] = 3 × 3 = 9.
68. Which term does not fit into the series: 5, 10, 17, 26, 37, 51, 65?
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Correct Answer: C) 51
Explanation: Series follows (n² + 1): 2²+1=5, 3²+1=10, 4²+1=17, 5²+1=26, 6²+1=37, 7²+1=50 (given 51, which is incorrect), 8²+1=65.
69. Statement: "Join our teacher preparation course to secure top percentile in the LTR exam."
Assumptions: I. Aspirants seek high percentiles. II. Coaching institutes offer systematic guidance.
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Correct Answer: C) Both I and II are implicit
Explanation: Any promotional educational banner presumes candidate aspiration and effective instructional value.
70. A sheet of paper is folded and punched as shown in standard tests. When unfolded, the symmetrical punch holes will mirror across which axes?
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Correct Answer: C) Both fold lines acting as mirror lines
Explanation: Every fold in paper-folding problems behaves as a line of symmetry upon unfolding.
71. Which hardware unit acts as the primary synchronization coordinator, directing data flow across computer buses?
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Correct Answer: A) Control Unit (CU)
Explanation: The Control Unit fetches, decodes, and sequences micro-instructions that manage all components of the CPU.
72. In a web address like https://www.ossc.gov.in, which portion denotes the top-level domain (TLD)?
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Correct Answer: C) .in
Explanation: '.in' is the country-code Top-Level Domain (ccTLD) for India.
73. Which memory technology is built into modern microprocessors to bridge the speed differential between CPU and RAM?
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Correct Answer: B) Cache Memory
Explanation: High-speed SRAM-based cache memory (L1, L2, L3) accelerates access to recurring instructions.
74. In Microsoft Excel, what shortcut key activates absolute cell referencing (locking rows/columns with dollar signs)?
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Correct Answer: B) F4
Explanation: Pressing F4 cycles cell references through relative (A1), absolute ($A$1), and mixed modes ($A1, A$1).
75. What type of cyber attack inundates a server with fraudulent traffic packets to render it inaccessible to legitimate users?
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Correct Answer: B) Denial of Service (DoS)
Explanation: DoS (and Distributed DoS) overwhelms system buffers with network queries, exhausting bandwidth or processing capability.
76. What is the default file extension of modern Word documents (Word 2007 onwards)?
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Correct Answer: B) .docx
Explanation: Modern Office documents are XML-based compressed archives using extensions ending with 'x' (.docx, .xlsx, .pptx).
77. What is the binary representation of the decimal number 13?
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Correct Answer: A) 1101
Explanation: 13 = 8 + 4 + 0 + 1 = (1101)₂.
78. Which network protocol automatically assigns dynamic IP addresses and configuration parameters to client devices on a local area network?
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Correct Answer: B) DHCP
Explanation: Dynamic Host Configuration Protocol (DHCP) automatically assigns IP addresses from a predefined subnet pool.
79. How many gigabytes (GB) are equivalent to 1 Terabyte (TB) in standard binary computing (2⁴⁰ bytes)?
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Correct Answer: B) 1024 GB
Explanation: 1 TB = 1024 GB = 1024 × 1024 MB in binary measurement standards.
80. Which software program acts as an intermediary bridge between computer hardware and user application software?
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Correct Answer: A) Operating System
Explanation: An operating system provides hardware abstraction, file management, process scheduling, and user interface controls.
81. In MS PowerPoint, what key combination is used to duplicate a selected slide?
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Correct Answer: B) Ctrl + D
Explanation: Ctrl + D duplicates the active slide or object; Ctrl + M inserts a new blank slide.
82. What is the primary function of the Domain Name System (DNS)?
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Correct Answer: B) Translate human-readable domain names to numerical IP addresses
Explanation: DNS acts as the phonebook of the internet, mapping URLs like 'google.com' into IP addresses like '142.250.190.46'.
83. Which of the following is considered an open-source operating system?
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Correct Answer: C) Ubuntu Linux
Explanation: Ubuntu Linux is freely distributable and governed by open-source licensing, unlike proprietary systems.
84. In cybersecurity, what term describes secretly installed software that records every keystroke made by an unsuspecting user?
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Correct Answer: B) Keylogger
Explanation: Keyloggers intercept keyboard inputs to capture passwords, banking logins, and sensitive messages.
85. In relational database schema design, what uniquely identifies every record in a table without duplicates?
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Correct Answer: B) Primary Key
Explanation: A Primary Key enforces entity integrity by guaranteeing that column values are unique and non-null.
86. What is the shortcut key used to lock a Windows personal computer immediately?
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Correct Answer: A) Windows Key + L
Explanation: Win + L locks the desktop workstation instantly, returning to the login lock screen.
87. Which communication technology is used in contactless payment credit cards and transit passes over distances of less than 4 cm?
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Correct Answer: B) Near Field Communication (NFC)
Explanation: NFC operates at 13.56 MHz for short-range electromagnetic inductive coupling.
88. In spreadsheet software, what does the formula =COUNTA(A1:A10) calculate?
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Correct Answer: B) Counts non-empty cells (numbers, text, logical values)
Explanation: COUNTA tallies any cell that is not blank, whereas COUNT strictly tallies numerical entries.
89. Which optical storage medium offers the highest commercial single-layer data capacity?
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Correct Answer: C) Blu-ray Disc (BD)
Explanation: Standard single-layer Blu-ray discs hold 25 GB of data using a 405 nm blue-violet laser, compared to 4.7 GB for DVDs.
90. What port standard has become the universal industry connector for charging, high-speed data transmission, and video output on modern laptops and smartphones?
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Correct Answer: C) USB Type-C
Explanation: USB-C is the 24-pin reversible standard that supports USB4, DisplayPort video, and USB Power Delivery.
91. Which organelle is universally referred to as the 'Powerhouse of the Cell' due to its role in cellular ATP synthesis?
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Correct Answer: B) Mitochondria
Explanation: Mitochondria generate adenosine triphosphate (ATP) through oxidative phosphorylation and the Krebs cycle.
92. What is the chemical formula of common baking soda used in cooking and baking?
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Correct Answer: B) NaHCO₃
Explanation: Sodium hydrogen carbonate (NaHCO₃) is baking soda. Washing soda is Na₂CO₃·10H₂O.
93. Which metal remains in liquid state at standard room temperature (25°C)?
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Correct Answer: B) Mercury (Hg)
Explanation: Mercury is the only pure metal that is liquid at standard room conditions. (Bromine is also liquid, but is a non-metal).
94. Sound waves cannot travel through which of the following mediums?
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Correct Answer: C) Vacuum
Explanation: Sound is a mechanical longitudinal wave that requires a material medium to propagate; it cannot cross a vacuum.
95. Deficiency of which hormone in the human bloodstream causes Diabetes Mellitus?
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Correct Answer: C) Insulin
Explanation: Insulin, produced by the beta cells of the Islets of Langerhans in the pancreas, lowers blood glucose levels.
96. What optical phenomenon is primarily responsible for the formation of a natural rainbow in the sky after rain?
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Correct Answer: B) Dispersion, refraction, and internal reflection
Explanation: Water droplets act as prisms that refract, disperse white light into spectral wavelengths, and internally reflect it back to the observer.
97. What is the SI unit of magnetic field strength (magnetic flux density)?
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Correct Answer: B) Tesla
Explanation: Magnetic flux density is measured in Teslas (T). Magnetic flux is measured in Webers (Wb).
98. Which gas is released as the primary fuel byproduct of anaerobic digestion in a biogas (gobar gas) plant?
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Correct Answer: A) Methane (CH₄)
Explanation: Biogas typically consists of 55–75% methane (CH₄) and 25–45% carbon dioxide.
99. Which part of the human eye contains light-sensitive photoreceptor cells known as rods and cones?
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Correct Answer: C) Retina
Explanation: The retina lines the back of the eye and holds rods (responsible for dim light vision) and cones (responsible for color vision).
100. Which international environmental treaty was formulated in Japan in 1997 with legally binding commitments to reduce greenhouse gas emissions?
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Correct Answer: B) Kyoto Protocol
Explanation: The Kyoto Protocol was adopted in 1997 under the UNFCCC framework to limit greenhouse gas emissions.