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Answer Keys Senior & Junior Investigator Paper 12 b
51. A problem in mathematics is given to three students A, B, and (C) If the probability of A solving the problem is 1/2 and B not solving it is 1/4. The whole probability of the problem being solved is 63/64. What is the probability of solving it?
(A) 44958
(B) 45145
(C) 23377
(D) 45139
Answer: “45139”
Important Answer Keys Senior & Junior Investigator
52. Which of the following is a table with all possible values of a random variable and its corresponding probabilities?
(A) Probability Density Function
(B) Probability Mass Function
(C) Probability Distribution
(D) Cumulative distribution function
Answer: “Probability Distribution”
53. Find the Expectation of a Hypergeometric Distribution such that the probability that a 4-trial hypergeometric experiment results in exactly 2 successes, when the population consists of 16 items.
(A) 44986
(B) 45139
(C) 45017
(D) 44958
Answer: “44958”
54. What is the probability of a sure event? (A) 1 (B) 0 (C) 45017 (D) 44958
Answer: “1”
55. If P(C) = 5/13, P(D) = 7/13, and P(C∩D) = 3/13, evaluate P(C|D).
(A) 45109
(B) 45049
(C) 45110
(D) 45108
Answer: “45110”
56. Consider Jack draws 3 cards from a pack of 52 cards. What is the probability of geƫng no kings?
(A) 0.8726
(B) 0.7862
(C) 0.8762
(D) 0.7826
Answer: “0.8762”
57. Which of the following cannot be the value of probability?
(A) 44958
(B) 0
(C) -1
(D) 1
Answer: “1”
58. Which test is used to check the adequacy of an index number?
(A) The Ɵme reversal test
(B) The factor reversal test
(C) The link relative test
(D) The weighted average test
Answer: “The factor reversal test”
59. What is base shiŌing in index number construction?
(A) Adjusting the base year to a more recent year
(B) Changing the weighting scheme of the index
(C) Combining two different index numbers
(D) Adding a new component to the index
Answer: “Adjusting the base year to a more recent year”
— UPSC – Previous year questions MCQ Quiz (@UPSC_Pyq_quiz) September 24, 2025
60. What is splicing in index number construction?
(A) Combining two different index numbers at a specific point in time
(B) Removing outliers from the data
(C) Adjusting the weights of the index components
(D) Deflating the index to account for inflation
Answer: “Combining two different index numbers at a specific point in time”
61. Synonym of ANALOGY
(A) Difference
(B) Comparison
(C) Addition
(D) Deletion
Answer: “Comparison”
62. Synonym of ALLURE
(A) Extol
(B) Excite
(C) Entice
(D) Elicit
Answer: “Entice”
63. Synonym of VOCIFEROUS
(A) violent
(B) loud
(C) Secret
(D) true
Answer: “loud”
64. Synonym of FICTIONAL
(A) genuine
(B) authentic
(C) fanciful
(D) real
Answer: “fanciful”
65. Synonym of STUPEFY
(A) lie
(B) make dull
(C) talk nonsense
(D) overread
Answer: “make dull”
66. Antonyms of BENEVOLENCE
(A) contempt
(B) malevolence
(C) hatred
(D) Derision
Answer: “malevolence”
67. Antonyms of KNACK
(A) dullness
(B) balance
(C) talent
(D) dexterity
Answer: “dullness”
68. Antonyms of CELIBATE
(A) profligate
(B) reprobate
(C) extravagant
(D) prodigal
Answer: “reprobate”
69. Antonyms of DITHER
(A) cry
(B) refer
(C) decide
(D) defer
Answer: “decide”
70. Choose the correct meaning of an idiom/ phrase – To talk through one’s hat :
(A) To speak fluently
(B) To talk nonsense
(C) To talk wisdom
(D) To speak at random
Answer: “To talk nonsense”
71. Choose the correct meaning of an idiom/ phrase – To snap one’s fingers :
(A) To speak abruptly
(B) To accept immediately
(C) To grasp eagerly
(D) To become contemptuous of
Answer: “To become contemptuous of”
72. Choose the correct spelling of the given word
(A) Forefiet
(B) Forefeit
(C) Forfeit
(D) Forfiet
Answer: “Forfeit”
73. Choose the correct spelling of the given word
(A) Comemorate
(B) Commemmorate
(C) Momemmorate
(D) Commemorate
Answer: “Commemorate”
74. Choose the correct alternative form – If you are really not feeling well. you ………. a doctor.
(A) should beƩer see
(B) may Sec
(C) had better see
(D) would rather see
Answer: “had better see”
75. Choose the correct alternative form – If only I………. his address, I would most certainly have told you.
(A) know
(B) knew
(C) had known
(D) off
Answer: “had known”
PASSAGE
It is sad that in country after country, progress should become synonymous with an assault on nature. We who are a part of nature and dependent on her for every need, speak constantly about ‘exploiting’ nature. When the highest mountain in the world was climbed in 1953, Jawaharlal Nehru objected to the phrase conquest of Everest’ which he thought was arrogant. Is it surprising that this lack of consideration and the constant need to prove one’s superiority should be projected on to our treatment of our fellowmen? I remember Edward Thompson, a British writer and a good friend of India, once telling Mr. Gandhi that wildlife was fast disappearing.
Remarked Mr. Gandhi: ‘It is decreasing in the jungles but it is increasing in the towns’ On the one hand the rich look askance at our continuing poverty; on the other they warn us against their own methods. We do not wish to impoverish the environment any further and yet we cannot forget the grim poverty of large numbers of people. Are not poverty and need the great polluters? For instance, unless we are in a position to provide employment and purchasing power for the daily necessities of the tribal people and those who live in and around our jungles, we cannot prevent them from combing the forest for food and livelihood, from poaching and from despoiling the vegetation.
76. At the beginning of the passage, the writer expresses her opinion that in many countries progress is synonymous with
(A) development.
(B) utmost care for nature.
(C) a balanced treatment of nature.
(D) utmost cruelty to nature.
Answer: “utmost care for nature”
Important Answer Keys Senior & Junior Investigator Paper
77. In the passage the term ‘exploitng’ nature suggests
(A) regreƞul Ness.
(B) sarcasm.
(C) destructive urge of man.
(D) greed of man.
Answer: “sarcasm”
78. Nehru objected to the phrase ‘conquest of Everest’ since
(A) it carries a war-like connotation.
(B) it sounds pompous and boasƞul.
(C) it depicts Everest as a vicƟm.
(D) Everest is unconquerable.
Answer: “it sounds pompous and boasƞul”
Important Answer Keys Senior & Junior Investigator Paper
79. Gandhi’s statement ‘It is decreasing in the jungles but it is increasing in the towns.!’
(A) Refers to wild animals’ decrease in the jungle.
(B) Refers to flora and fauna
(C) Refers to man’s selfishness.
(D) Is a saƟrical comparison of man’s callousness to the animals.
Answer: “Refers to man’s selfishness”
80. The writer is of opinion that tribal people can be prevented from combing forest for food
(A) to provide employment
(B) to increase purchasing power
(C) by deterring them from poaching and despoiling vegetation
(D) to provide employment and purchasing power for daily necessities
Answer: “to provide employment and purchasing power for daily necessities”
Important Answer Keys Senior & Junior Investigator Paper
81. The principal copper deposits of India lie in which of the following places?
(A) Hazaribagh and Singbhum of Bihar
(B) Khetri and Daribo areas of Rajasthan
(C) Anantapur in Andhra Pradesh
(D) Siwaliks in Uttar Pradesh and in Karnataka
Answer: “Hazaribagh and Singbhum of Bihar”
82. Which of the following are true regarding Jhum cultivation in India? I.It is largely practiced in Assam II.It is referred to as ‘slash and burn’ technique III.In it, the fertility is exhausted in a few years
(A) I, II and III (B) II and III (C) I and II (D) I and III Answer: “I, II and III” 83. The Yarlung Zangbo River, in India, is known as
(A) Ganga
(B) Indus
(C) Brahmaputra
(D) Mahanadi
Answer: “Brahmaputra”
Important Answer Keys Senior & Junior Investigator Paper
84. The Salal Project is on the river
(A) Chenab
(B) Jhelum
(C) Ravi
(D) Sutlej
Answer: “Chenab”
85. The only zone in the country that produces gold is also rich in iron is
(A) North-eastern zone
(B) North-western zone
(C) Southern zone
(D) South-eastern zone
Answer: “Southern zone”
Important Answer Keys Senior & Junior Investigator Paper
86. Which one Bank is not one of the three Banks that will be merged to form the third largest Bank in India?
(A) Punjab NaƟonal Bank
(B) Bank of Baroda
(C) Indian Bank
(D) Dena Bank
Answer: “Indian Bank”
Important Answer Keys Senior & Junior Investigator Paper
87. The 2019 Pravasi Bharthiya Divas will be held on which city
(A) Varanasi
(B) New Delhi
(C) Ahmedabad
(D) Surat
Answer: “Varanasi”
88. What is the name of the India’s longest suspension bridge built in Leh by Indian Army?
(A) Gagan Bridge
(B) Maitri Bridge
(C) Mahatma Bridge
(D) Sardar Bridge
Answer: “Maitri Bridge”
89. Which country launched the world’s first nation wise 5G mobile network?
(A) Japan
(B) Malaysia
(C) South Korea
(D) China
Answer: “South Korea”
Important Answer Keys Senior & Junior Investigator Paper
90. Which famous singer is awarded with Bharat Ratna award in the year 2019?
(A) Manna Dey
(B) Bhupen Hazarika
(C) Asha Bhosle
(D) Lata Mangeshkar
Answer: “Bhupen Hazarika”
91. What comes next? January,February,April,July,November,April,?????
(A) December
(B) March
(C) October
(D) February
Answer: “October”
92. In the following questions, a series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. AGMSY,CIOUA,EKQWC,?,IOUAG,KQWCI
(A) GMSYE
(B) FMSYE
(C) GNSYD
(D) FMYES
Answer: “GMSYE”
93. Select the related word/letters/numbers from the given alternatives: 4 : 20 : : 8 : ?
(A) 74
(B) 70
(C) 72
(D) 78
Answer: “72”
94. M is son of P, Q is the grand-daughter of O, who is the husband of P. How is M related to O?
(A) Son
(B) Daughter
(C) Mother
(D) Father
Answer: “Son”
Important Answer Keys Senior & Junior Investigator Paper
95. If “A” means “subtraction”, “B” means “division”, “C” means “addition” and “D” means “multiplication”, then 305 B 5 A 28 C 43 D 12 = ____
(A)
569
(B)
549
(C)
560
(D)
530
Answer: “549”
96.
Select the related word/number from the given alternatives:
CLOSE : DNRWJ : : OPEN : __
(A)
PRHR
(B)
PRJQ
(C)
RPJB
(D)
RZWR
Answer: “PRHR”
Important Answer Keys Senior & Junior Investigator Paper
97.
Select the word which can be formed from the word IMMEDIATELY.
(A)
DIALECT
(B)
LIMITED
(C)
DIAMETER
(D)
DICTATE
Answer: “LIMITED”
Important Answer Keys Senior & Junior Investigator Paper
98.
Introducing a girl, Ankit says, “She is the sister of the son of my mother’s
sister”. How is the girl related to Ankit?
(A)
Niece
(B)
Daughter
(C)
Sister
(D)
Cousin
Answer: “Cousin”
99.
It was Sunday on jan 2, 2006, what was the day of the week Jan 1, 2010 ?
(A)
Sunday
(B)
Thursday
(C)
Friday
(D)
Saturday
Answer: “Thursday”
100.
Neha walks 30m towards south, then turning to her right she walks 30m, then
turning to her let, she walks 20m, again she turns to her let and walks 30m.
How far is she from her initial position?
(A)
20 mtr
(B)
30 mtr
(C)
50 mtr
(D)
60 mtr
Answer: “50 mtr”
Important Answer Keys Senior & Junior Investigator Paper
Important Answer Keys Senior & Junior Investigator Paper
