Science & Technology

923 questions asked in UPSC Prelims.

2008 · Q104 Science & TechnologyScience & Technology Institutionseasy

Which of the following pairs are correctly matched? Institute — Location 1. National Centre for Cell Science : Mysore 2. Centre for DNA Fingerprinting and Diagnostics : Hyderabad 3. National Brain Research Centre : Gurgaon Select the correct answer using the code given below:

(a)1, 2 and 3
(b)1 and 2 only
(c)2 and 3 only
(d)1 and 3 only

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Official answer(c) 2 and 3 only

2008 · Q105 Science & TechnologyEnergy & Environmenteasy

With which one of the following is BRIT (Government of India) engaged?

(a)Railway Wagons
(b)Information Technology
(c)Isotope Technology
(d)Road Transport

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Official answer(c) Isotope Technology

2008 · Q106 Science & TechnologyNumber systems / Roman numeralseasy

Which one of the following is the correct sequence in respect of the Roman numerals—C, D, L and M?

(a)C > D > L > M
(b)M > L > D > C
(c)M > D > C > L
(d)L > C > D > M

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Official answer(c) M > D > C > L

2008 · Q107 Science & TechnologyScience & Technology Historymoderate

Who among the following scientists shared the Nobel Prize in Physics with his son?

(a)Max Planck
(b)Albert Einstein
(c)William Henry Bragg
(d)Enrico Fermi

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Official answer(c) William Henry Bragg

2008 · Q110 Science & TechnologySpace Technology & Astronomymoderate

Consider the following statements in respect of a jet engine and a rocket: 1. A jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space. 2. A rocket carries its own supply of oxygen in the gas form, and fuel. 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

2008 · Q111 Science & TechnologyPhysicseasy

Which one of the following laser types is used in a laser printer?

(a)Dye laser
(b)Gas laser
(c)Semiconductor laser
(d)Excimer laser

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Official answer(c) Semiconductor laser

2008 · Q112 Science & TechnologyPhysicsmoderate

Consider the following statements: 1. A widely used musical scale called diatonic scale has seven frequencies. 2. The frequency of the note Sa (स) is 256 Hz and that of Ni (नी) is 512 Hz. 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(a) 1 only

2008 · Q113 Science & TechnologyMaterials & Engineeringeasy

What are Rubies and Sapphires chemically known as?

(a)Silicon dioxide
(b)Aluminium oxide
(c)Lead tetroxide
(d)Boron nitride

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Official answer(b) Aluminium oxide

2008 · Q114 Science & TechnologyChemistryeasy

Which one of the following is also called Stranger Gas?

(a)Argon
(b)Neon
(c)Xenon
(d)Nitrous oxide

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Official answer(c) Xenon

2008 · Q115 Science & TechnologyHealth & Diseaseseasy

Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?

(a)Hydrogen and oxygen
(b)Oxygen and acetylene
(c)Methane and air
(d)Carbon dioxide and methane

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Official answer(c) Methane and air

2008 · Q116 Science & TechnologyChemistryeasy

Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

(a)Lithium and mercury
(b)Lithium and osmium
(c)Aluminium and osmium
(d)Aluminium and mercury

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Official answer(b) Lithium and osmium

2008 · Q121 Science & TechnologyScience & Technology Historyeasy

Which of the following pairs is/are correctly matched? 1. Francis Collins — Mapping human genome 2. Sergey Brin : Google Search Engine 3. Jimmy Wales — Wikipedia Select the correct answer using the code given below:

(a)1 and 2 only
(b)2 and 3 only
(c)3 only
(d)1, 2 and 3

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Official answer(d) 1, 2 and 3

2008 · Q126 Science & TechnologyPhysicseasy

How can the height of a person who is six feet tall be expressed (approximately) in nanometres?

(a)183 × 10⁶ nanometres
(b)234 × 10⁶ nanometres
(c)183 × 10⁷ nanometres
(d)234 × 10⁷ nanometres

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Official answer(c) 183 × 10⁷ nanometres

2008 · Q127 Science & TechnologyPhysicsmoderate

A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?

(a)It will be greater than R
(b)It will be less than R
(c)It will be equal to R
(d)It shall depend on the material of the road

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Official answer(c) It will be equal to R

2008 · Q130 Science & TechnologyDefence Technologyeasy

In the context of the Indian defence, what is ‘Dhruv’?

(a)Aircraft-carrying warship
(b)Missile-carrying submarine
(c)Advanced light helicopter
(d)Intercontinental ballistic missile

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Official answer(c) Advanced light helicopter

2008 · Q132 Science & TechnologyBiologymoderate

Assertion (A): In human body, liver has an important role in fat digestion. Reason (R): Liver produces two important fat-digesting enzymes.

(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

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Official answer(c) A is true but R is false

2008 · Q133 Science & TechnologyPhysicseasy

Assertion (A): In the visible spectrum of light, red light is more energetic than green light. Reason (R): The wavelength of red light is more than that of green light.

(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

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Official answer(d) A is false but R is true

2008 · Q134 Science & TechnologyPhysicsmoderate

Assertion (A): Radio waves bend in a magnetic field. Reason (R): Radio waves are electromagnetic in nature.

(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

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Official answer(d) A is false but R is true

2008 · Q136 Science & TechnologyBiologyeasy

Among the following, which one lays eggs and does not produce young ones directly?

(a)Echidna
(b)Kangaroo
(c)Porcupine
(d)Whale

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Official answer(a) Echidna

2008 · Q143 Science & TechnologyScience & Technology Historyeasy

Nobel Prize–winning scientist James D. Watson is known for his work in which area?

(a)Metallurgy
(b)Meteorology
(c)Environmental protection
(d)Genetics

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Official answer(d) Genetics

2008 · Q147 Science & TechnologyQuantitative Aptitudemoderate

In how many different ways can all of 5 identical balls be placed in the cells shown above such that each row contains at least 1 ball?

(a)64
(b)81
(c)84
(d)108

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Official answer(d) 108

2008 · Q148 Science & TechnologyQuantitative Aptitudeeasy

There are 6 different letters and 6 correspondingly addressed envelopes. If the letters are randomly put in the envelopes, what is the probability that exactly 5 letters go into the correctly addressed envelopes?

(a)Zero
(b)1/6
(c)1/2
(d)5/6

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Official answer(a) Zero

2008 · Q149 Science & TechnologyQuantitative Aptitudemoderate

There are two identical red, two identical black and two identical white balls. In how many different ways can the balls be placed in the cells (each cell to contain one ball) shown above such that balls of the same colour do not occupy any two consecutive cells?

(a)15
(b)18
(c)24
(d)30

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Official answer(c) 24

2008 · Q150 Science & TechnologyLogical Reasoning & Puzzlesmoderate

How many different triangles are there in the figure shown above?

(a)28
(b)24
(c)20
(d)16

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Official answer(a) 28

2007 · Q2 Science & TechnologyComputer & Information Technologyeasy

Who among the following is considered as the inventor of the World Wide Web (WWW)?

(a)Edward Kasner
(b)Bill Gates
(c)Tim Berners-Lee
(d)Vinod Bham

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Official answer(c) Tim Berners-Lee