Science & Technology

923 questions asked in UPSC Prelims.

2007 · Q14 Science & TechnologyMaterials & Engineeringmoderate

Consider the following statements: 1. The series of international paper sizes is based on A0 size whose area is 0.5 m² (approx). 2. The area of A4 size paper is 1⁄8th of the A0 size paper. 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

2007 · Q16 Science & TechnologyEnergy & Environmentmoderate

Recently, the European Union and six other countries including India signed the International Thermonuclear Experimental Reactor (ITER) Project. Which one of the following was NOT a signatory to it?

(a)Canada
(b)China
(c)Japan
(d)USA

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Official answer(a) Canada

2007 · Q22 Science & TechnologyScience & Technology Historyeasy

What is the broad area in which the Nobel Prize winners for the year 2006 in Physiology or Medicine worked to get the prize?

(a)Prevention of weakening due to ageing
(b)Flow of genetic information
(c)Immunology and disease resistance
(d)Adult stem-cell research

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Official answer(b) Flow of genetic information

2007 · Q24 Science & TechnologySpace Technology & Astronomymoderate

Consider the following statements: 1. In the year 2006, India successfully tested a full-fledged cryogenic stage in rocketry. 2. After USA, Russia and China, India is the only country to have acquired the capability for use of cryogenic stage in rocketry. 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

2007 · Q103 Science & TechnologyChemistryeasy

Which one of the following is another name of RDX?

(a)Cyanohydrin
(b)Dextran
(c)Cyclohexane
(d)Cyclonite

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Official answer(d) Cyclonite

2007 · Q104 Science & TechnologyElectrical Conductivity of Non-metalsmoderate

Which one of the following non-metals is NOT a poor conductor of electricity?

(a)Sulphur
(b)Selenium
(c)Bromide
(d)Phosphorus

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Official answer(b) Selenium

2007 · Q105 Science & TechnologyHealth & Diseaseseasy

Robert Webster is known for his work associated with which one of the following?

(a)Cardiology
(b)Influenza virus
(c)HIV/AIDS
(d)Alzheimer

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Official answer(b) Influenza virus

2007 · Q106 Science & TechnologyPhysicsmoderate

Consider the following statements : 1. If magenta and yellow coloured circles intersect, the intersected area will have red colour. 2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour. 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

2007 · Q107 Science & TechnologyPhysicsmoderate

Consider the following statements: 1. A flute of smaller length gives waves of lower frequency. 2. Sound travels in rocks in the form of longitudinal elastic waves only. 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

2007 · Q108 Science & TechnologyPhysicsmoderate

Four wires of the same material and of the dimensions given below are stretched by equal loads separately. Which one of them will be elongated the maximum?

(a)Wire of 1 m length and 2 mm diameter
(b)Wire of 2 m length and 2 mm diameter
(c)Wire of 3 m length and 1.5 mm diameter
(d)Wire of 1 m length and 1 mm diameter

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Official answer(c) Wire of 3 m length and 1.5 mm diameter

2007 · Q109 Science & TechnologyBiologyeasy

Which one of the following parts of the pitcher plant becomes modified into a pitcher?

(a)Stem
(b)Leaf
(c)Stipule
(d)Petiole

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Official answer(b) Leaf

2007 · Q110 Science & TechnologyPhysicsmoderate

Assertion (A): A jet aircraft moving at Mach number equal to 1 travels faster at an altitude of 15 km than while moving at Mach number equal to 1 near sea level. Reason (R): The velocity of sound depends on the temperature of the surrounding medium.

(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are 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

2007 · Q111 Science & TechnologyBiologyeasy

In the human body, to which structure is the appendix attached?

(a)The large intestine
(b)The small intestine
(c)The gall-bladder
(d)The stomach

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Official answer(a) The large intestine

2007 · Q112 Science & TechnologyMaterials & Engineeringmoderate

Which one of the following types of glass can cut off ultraviolet rays?

(a)Soda glass
(b)Pyrex glass
(c)Jena glass
(d)Crookes glass

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Official answer(d) Crookes glass

2007 · Q113 Science & TechnologyBiologyeasy

In the human body which one of the following hormones regulates blood calcium and phosphate?

(a)Glucagon
(b)Growth hormone
(c)Parathyroid hormone
(d)Thyroxin

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Official answer(c) Parathyroid hormone

2007 · Q114 Science & TechnologyBiologyeasy

How do most insects respire?

(a)Through skin
(b)Through gills
(c)By lungs
(d)By tracheal system

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Official answer(d) By tracheal system

2007 · Q115 Science & TechnologyBiologyeasy

Which one of the following parts of the human brain is the regulating centre for swallowing and vomiting?

(a)Cerebellum
(b)Cerebrum
(c)Medulla oblongata
(d)Pons

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Official answer(c) Medulla oblongata

2007 · Q116 Science & TechnologyBiologymoderate

Production of which one of the following is a function of the liver?

(a)Lipase
(b)Urea
(c)Mucus
(d)Hydrochloric acid

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Official answer(b) Urea

2007 · Q117 Science & TechnologyBiologyeasy

Which of the following is not a digestive enzyme in the human system?

(a)Trypsin
(b)Gastrin
(c)Ptyalin
(d)Pepsin

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Official answer(b) Gastrin

2007 · Q118 Science & TechnologyBiologyeasy

Which of the following light types of light are strongly absorbed by plants:

(a)Violet and Orange
(b)Blue and Red
(c)Indigo and Yellow
(d)Yellow and Violet

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Official answer(b) Blue and Red

2007 · Q119 Science & TechnologyBiologyeasy

In human beings, normally in which one of the following parts does the sperm fertilize the ovum?

(a)Cervix
(b)Fallopian Tube
(c)Lower Part of Uterus
(d)Upper Part of Uterus

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Official answer(b) Fallopian Tube

2007 · Q120 Science & TechnologyPhysicsmoderate

Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first?

(a)Vessel B
(b)All the vessels A, B and C will be emptied simultaneously
(c)Vessel A
(d)Vessel C

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Official answer(d) Vessel C

2007 · Q121 Science & TechnologyChemistryeasy

Which one of the following is called Philosopher’s wool?

(a)Zinc Bromide
(b)Zinc Nitrate
(c)Zinc Oxide
(d)Zinc Chloride

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Official answer(c) Zinc Oxide

2007 · Q122 Science & TechnologyChemistryeasy

Which one of the following does not contain silver?

(a)Horn Silver
(b)German Silver
(c)Ruby Silver
(d)Lunar Caustic

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Official answer(b) German Silver

2007 · Q123 Science & TechnologyHealth & Diseaseseasy

Which of the following types is used by computed tomography employed for visualization of the internal structure of human body?

(a)X-Ray
(b)South waves
(c)Magnetic resonance
(d)Radioisotopes

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Official answer(a) X-Ray