Which one of the following is used as an explosive ?
- (a)Phosphorus trichloride
- (b)Mercuric oxide
- (c)Graphite
- (d)Nitroglycerine
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Official answer(d) Nitroglycerine
Science & Technology
923 questions asked in UPSC Prelims.
Consider the following : 1. Camphor 2. Chicory 3. Vanilla Which of the above is/are plant product(s) ?
- (a)1 and 2 only
- (b)3 only
- (c)1 and 3 only
- (d)1, 2 and 3
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Official answer(d) 1, 2 and 3
In the context of Indian wild life, the flying fox is a
- (a)Bat
- (b)Kite
- (c)Stork
- (d)Vulture
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Official answer(a) Bat
A person has 4 coins each of different denomination. What is the number of different sums of money the person can form (using one or more coins at a time)?
- (a)16
- (b)15
- (c)12
- (d)11
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Official answer(b) 15
How many numbers lie between 300 and 500 in which 4 comes only one time?
- (a)99
- (b)100
- (c)110
- (d)120
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Official answer(a) 99
How many letters of the English alphabet (capitals) appear same when looked at in a mirror?
- (a)9
- (b)10
- (c)11
- (d)12
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Official answer(c) 11
How many three-digit numbers can be generated from 1, 2, 3, 4, 5, 6, 7, 8, 9 such that the digits are in ascending order?
- (a)80
- (b)81
- (c)83
- (d)84
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Official answer(d) 84
There are four persons A, B, C, D; and A has some coins. A gave half of the coins to B and 4 more besides. B gave half of the coins to C and 4 more besides. C gave half of the coins to D and 4 more besides. Both B and D end up with same number of coins. How many coins did A have originally?
- (a)96
- (b)84
- (c)72
- (d)64
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Official answer(c) 72
While adding the first few continuous natural numbers, a candidate missed one of the numbers and wrote the answer as 177. What was the number missed?
- (a)11
- (b)12
- (c)13
- (d)14
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Official answer(c) 13
Four metal rods of lengths 78 cm, 104 cm, 117 cm and 169 cm are to be cut into parts of equal length. Each part must be as long as possible. What is the maximum number of pieces that can be cut?
- (a)27
- (b)36
- (c)43
- (d)480
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Official answer(b) 36
In an examination, there are three subjects A, B and C. A student has to pass in each subject. 20% students failed in A, 22% students failed in B and 16% failed in C. The total number of students passing the whole examination lies between
- (a)42% and 84%
- (b)42% and 78%
- (c)58% and 78%
- (d)58% and 84%
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Official answer(b) 42% and 78%
There is a family of 6 persons A, B, C, D, E and F. There are two married couples in the family. The family members are lawyer, teacher, salesman, engineer, accountant and doctor. D, the salesman is married to the lady teacher. The doctor is married to the lawyer. F, the accountant is the son of B and brother of E. C, the lawyer is the daughter-in-law of A. E is the unmarried engineer. A is the grandmother of F. How is E related to F?
- (a)Brother
- (b)Sister
- (c)Father
- (d)Cannot be established (cannot be determined)
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Official answer(d) Cannot be established (cannot be determined)
How many times are an hour hand and a minute hand of a clock at right angles during their motion from 1.00 p.m. to 10.00 p.m.?
- (a)9
- (b)10
- (c)18
- (d)20
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Official answer(c) 18
There are 240 balls and n number of boxes B1, B2, B3, … , Bn. The balls are to be placed in the boxes such that B1 should contain 4 balls more than B2, B2 should contain 4 balls more than B3, and so on. Which one of the following cannot be the possible value of n?
- (a)4
- (b)5
- (c)6
- (d)7
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Official answer(d) 7
In a carrom board game competition, m boys and n girls (m > n > 1) of a school participate in which every student has to play exactly one game with every other student. Out of the total games played, it was found that in 221 games one player was a boy and the other player was a girl. Consider the following statements : 1. The total number of students that participated in the competition is 30. 2. The number of games in which both players were girls is 78. Which of the statements given above is/are correct ?
- (a)1 only
- (b)2 only
- (c)Both 1 and 2
- (d)Neither 1 nor 2
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Official answer(c) Both 1 and 2
There are three cans A, B and C. The capacities of A, B and C are 6 litres, 10 litres and 16 litres respectively. The can C contains 16 litres of milk. The milk has to be divided in them using these three cans only. Consider the following statements : 1. It is possible to have 6 litres of milk each in can A and can B. 2. It is possible to have 8 litres of milk each in can B and can C. Which of the statements given above is/are correct ?
- (a)1 only
- (b)2 only
- (c)Both 1 and 2
- (d)Neither 1 nor 2
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Official answer(c) Both 1 and 2
Which one among the following has the highest energy ?
- (a)Blue light
- (b)Green light
- (c)Red light
- (d)Yellow light
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Official answer(a) Blue light
India has recently landed its Moon Impact Probe on the Moon. Among the following countries, which one landed such probe on the Moon earlier ?
- (a)Australia
- (b)Canada
- (c)China
- (d)Japan
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Official answer(d) Japan
In the context of Indian defence, consider the following statements : 1. The Shourya missile flies with a speed of more than 8 Mach. 2. The range of Shourya missile is more than 1600 km. Which of the statements given above is/are correct ?
- (a)1 only
- (b)2 only
- (c)Both 1 and 2
- (d)Neither 1 nor 2
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Official answer(d) Neither 1 nor 2
WiMAX is related to which one of the following ?
- (a)Biotechnology
- (b)Space technology
- (c)Missile technology
- (d)Communication technology
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Official answer(d) Communication technology
For outstanding contribution to which one of the following fields is Shanti Swarup Bhatnagar Prize given ?
- (a)Literature
- (b)Performing Arts
- (c)Science
- (d)Social Service
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Official answer(c) Science
In making the saffron spice, which one of the following parts of the plant is used ?
- (a)Leaf
- (b)Petal
- (c)Sepal
- (d)Stigma
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Official answer(d) Stigma
In the year 2008, which one of the following conducted a complex scientific experiment in which sub-atomic particles were accelerated to nearly the speed of light ?
- (a)European Space Agency
- (b)European Organization for Nuclear Research
- (c)International Atomic Energy Agency
- (d)National Aeronautics and Space Administration
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Official answer(b) European Organization for Nuclear Research
With reference to the evolution of living organisms, which one of the following sequences is correct?
- (a)Octopus – Dolphin – Shark
- (b)Pangolin – Tortoise – Hawk
- (c)Salamander – Python – Kangaroo
- (d)Frog – Crab – Prawn
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Official answer(c) Salamander – Python – Kangaroo
In the series AABABCABCDABCDE... which letter occupies the 100th position?
- (a)H
- (b)I
- (c)J
- (d)K
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Official answer(b) I