Q1. Assertion (A): Transformer is useful for stepping up or 70. Which one of the following types of waves are used in a stepping down voltages. night vision apparatus?
Correct Answer: (c)
Dry cleaning is a cleaning process for clothing and
UPSC 2008
Q2. Light of longer wavelength are scattered much more (d) A is false but R is true than the light of shorter wavelength. E 6 Topicwise Solved Papers 69. Assertion (A): Radio waves bend in a magnetic field. D. Electricity and Magnetism Reason (R): Radio waves are electromagnetic in nature.
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2007
Q3. Which of the following types is used by computed (c) Weak nuclear force causes radioactivity tomography employed for visualisation of the internal (d) Strong nuclear force holds protons and neutrons inside structure of human body?
Correct Answer: (d)
Shell gas contains methane, according to first more effectively than oxygen and also stays bound to the statement, it contains propane and butane which is wrong. haemoglobin for far longer than oxygen does. The effect is The source of shell gas is available in India. So the statement that the blood is starved of oxygen, which then affects the (2) is also wrong. rest of the body.
UPSC 2006
Q4. What is the approximate mean velocity with which the earth moves round the sun in its orbit?
Correct Answer: (d)
Amalgam is an alloy consisting of mercury and any magnesium ions in soil which increases soil alkalinity. other element.Iron being exceptional in nature not form
UPSC 2006
Q5. In which one among the following is the speed of sound Codes : maximum?
Correct Answer: (d)
Ethylene glycol solutions are marketed as 'permanent processing aids, and corrosion inhibitors. As cleaning aids, anti-freeze', and is used as anti-freeze agent for the soluble silicates provide alkalinity and promote soil automobile engine in cold countries where temperature is suspension. Sodium sulphate is simply a filler in detergent below zero degree centigrade. powder, in much the same way as fillers are used in many OH medical tablets, it doesn't play any active role as such. HO
UPSC 2006
Q6. A geo-stationary satellite is at an approximate height poles of 10,000 km. (b) Ozone layer around the Earth reflects them back to 2. FM transmission of music is of very good quality outer space because the atmospheric or man made noises which (c) Moisture in the upper layers of atmosphere prevents are generally frequency variations can do little harm. them from reaching the surface of the Earth Wh
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2005
Q7. Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?
Correct Answer: (c)
Coke is added in blast furnance along with iron ore in
UPSC 2004
Q8. A car is running on a road at a uniform speed of 60 km/h. axle is reduced The net resultant force on the car is :
Correct Answer: (a)
Fluorine is the most reactive among all halogens. in collisions with sodium atoms. Sodium also need not be However the reactivity decreases from F to I (from top to 2 2 pressurized since its boiling point is higher than the reactor's bottom of group) may be attributed to operating temperature. A disadvantage of sodium is its (1) Low dissociation enthalpies chemical reactivity, which requires special precautions to (2) High electron affinities prevent and suppress fires. If sodium comes into cont
UPSC 2004
Q9. A weightless rubber balloon is filled with 200 cc of water. Its strip is heated, then it will appear as weight in water is equal to :
Correct Answer: (a)
Potassium bromide is used in photography as a 2 to slow down the speed of neutrons. restrainer in black and white developer formulas. Gun powder, also called black powder, is a mixture of sulphur, B. Inorganic Chemistry charcoal, and potassium nitrate. Gun powder can be made by just using potassium nitrate and charcoal (or alternatively
UPSC 2003
Q10. the big trees that we see around would not have grown (a) remains horizontal on the Earth (b) is inclined to the horizontal with smaller depth at the Which of the statements given above are correct? rear end (a) 1, 2 and 3 only (b) 1, 3 and 4 only (c) is inclined to the horizontal with larger depth at the (c) 2 and 4 only (d) 1, 2, 3 and 4 rear end 35. Ball bearings are used in bicycles, cars, etc
Correct Answer: (b)
Nuclear fission is a perfect example of chain reaction. in radiation therapy for treatment of cancer. In case of nuclear fission a heavy atomic nucleus (such as
UPSC 2003
Q11. Terrestrial heating 2. Reflection of light statements, one labeled as the Assertion (A) and the other as 3. Refraction of light 4. Diffraction of light Reason (R). You have to answer these items using the code given Due to which of these phenomena is a mirage formed ? below. (a) 1 and 2 (b) 2, 3 and 4 56. Assertion (A) : In a motion picture, usually 24 frames are (c) 1 and 3 (d) 4 only projected e
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2003
Q12. Which one of the following statements is not correct? (a) Both A and R are true and R is the correct explanation of A
Correct Answer: (a)
Fuel value can be expressed in terms of calorific value less sticky and has superior mechanical properties. of fuel. The calorific value of a fuel is the amount of heat
UPSC 2002
Q13. Radial tyres 20. Assertion (A) : With the increase of temperature, the 2. Streamlined body viscosity of glycerine increases. 3. Multipoint fuel injection Reason (R) : Rise of temperature increases kinetic energy 4. Catalytic converter with exhaust of molecules.
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2002
Q14. Assertion (A) : An iron ball floats on mercury but gets have to answer these item using the code given below. immersed in water. Reason (R) : The specific gravity of iron is more than that of 16. Assertion (A) : A man standing on a completely frictionless mercury.
Correct Answer: (c)
A hydrogen vehicle is an alternative fuel vehicle that cooking soda, bicarbonate of soda. uses hydrogen as its onboard fuel for motive power. The Caustic soda or sodium hydroxide is an essential ingredient hydrogen vehicle use hydrogen fuel cell for generation of in an array of industrial applications. In addition, consumers motive power. These fuel cell in which hydrogen serve as a use caustic soda when using cleaners, such as oven and fuel and oxygen as an oxidant emits exhaust of water. drain
UPSC 2002
Q15. A solid cube gets completely immersed in water when a 0.2 (d) A is false but R is true kg mass is placed on it. If the mass is removed, the cube is 17. The mass of a body on earth is 100 kg (acceleration due to 2 cm above the water level. What is the length of each side gravity, ge = 10 m/s2. If acceleration due to gravity on the moon of the cube?
Correct Answer: (a)
Heavy water (H O) and solid graphite is generally used
UPSC 2001
Q16. Which of the following distance-time graph (x-t) represents 2h 2h one-dimensional uniform motion?
Correct Answer: (d)
Crookes glass is a type of glass that contains cerium industrial copper salts, used in insecticides, germicides, and and other rare earths and has a high absorption of ultraviolet hair dyes and in the processing of leather and textiles. radiation used in sunglasses. Magnesium sulphate is a chemical compound containing
UPSC 2001
Q17. Assertion (A) : A piece of copper and a piece of glass are (a) pitch, loudness and quality heated to the same temperature. When touched, thereafter, (b) pitch and loudness the copper piece appears hotter than the glass piece. Reason (R) : The density of copper is more than that of (c) quality only glass.
Correct Answer: (c)
Aqueous solution of copper sulphate is acidic in nature amalgam with mercury. That's why mercury is stored in because copper sulphate on dissolving with water, following vessels made up of iron. Small quantities of an iron amalgam chemical reaction takes place have, however, been formed by immersing sodium amalgam CuSO (s) + 2H O ¾¾®Cu(OH) (l) + H SO (aq) (containing 1 percent sodium) in a clear, saturated solution 4 2 2 2 4 Now as we can see in above chemical equation the sulphuric of ferrous s
UPSC 2001
Q18. Assertion (A) : The boiling point of water decreases as the 47. Assertion (A) : A diamond sparkles more than a glass altitude increases. imitation cut to the same shape. Reason (R) : The atmospheric pressure increases with Reason (R) : The refractive index of diamond is less than altitude.
Correct Answer: (b)
The electron affinity of a molecule or atom is the because of its extreme reactive nature. In open air it reacts energy change when an electron is added to the neutral violently and burns vigorously to form sodium oxide . atom to form a negative ion. This property can only be
UPSC 2001
Q19. When water is heated from 0°C to l0°C. Its volume:
Correct Answer: (a)
The oxidation number characterises the oxidation state Calcium is the basic element of naturally occuring marble. of an element in a compound. It is a full number, positive or Sand is formed by Silicon and Aluminium is the basic element negative, which indicates the amount of electron loss or of naturally occuring Ruby. gain by this element in the given compound, with respect to
UPSC 2001
Q20. A flute of smaller length produces waves of lower DIRECTION (Q. 59): The following item consist of two statements, frequency. one labeled as the Assertion (A) and the other as Reason (R). You 2. Sound travels in rocks in the form of longitudinal elastic have to answer this item using the code given below. waves only. 59. Assertion (A) : A stick is dipped in water in a slanting Which of the stateme
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2001
Q21. Assertion (A) : A jet aircraft moving at Mach Number equal (d) A is false but R is true to 1 travels faster at an altitude of 15 km than while moving 60. When light waves pass from air to glass, the variables at Mach Number equal to 1 near the sea level. affected are:
Correct Answer: (b)
Formic acid is stronger than acetic acid due to its 4 methane produces less carbon dioxide for each unit of heat chemical composition. Formic acid is an organic acid. E 28 Topicwise Solved Papers released. In many cities, methane is piped into homes for D. Environmental Chemistry domestic heating and cooking purposes. Methane in the form of compressed natural gas is used as a vehicle fuel.
UPSC 2001
Q22. Supply hot water to residential buildings. (c) reduces current in the circuit 2. Supply water for minor irrigation projects. (d) chokes low frequency current 3. Provide street lighting. 83. Two wires have their lengths, diameters and resistivities all 4. Electrify a cluster of villages and small towns. in the ratio of 1 : 2. If the resistance of the thinner wire is 10 (a) 1, 2, 3 and 4 are correct
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2001
Q23. Match the names of outstanding Indian scientists given in (d) carbon dioxide with ethane List I with area of their specialized work given in List II and 12. In an atom, the order of filling up of the orbitals is governed select the correct answer by using the codes given below by
Correct Answer: (c)
Raja Ramanna India's Most Eminent Nuclear Physicist,
UPSC 2001
Q24. Space research (a) 3 months (b) 4 months 5. Agricultural science (c) 8 months (d) 12 months Codes : 14. Which one of the following is NOT radioactive?
Correct Answer: (b)
Nuclear fission is a perfect example of chain reaction. in radiation therapy for treatment of cancer. In case of nuclear fission a heavy atomic nucleus (such as
UPSC 2000
Q25. If magenta and yellow coloured circles intersect, the 58. When a CD (compact disc used in audio and video systems) intersected area will have red colour. is seen in sunlight, rainbow like colours are seen. This can 2. If cyan and magenta coloured circles intersect, the be explained on the basis of the phenomenon of :
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2000
Q26. Assertion (A) : In our houses, the current in A.C. electricity 92. For reproducing sound, a CD (Compact Disc) audio player line changes direction 60 times per second. uses a :
Correct Answer: (d)
America used Dioxin which is defoliants to clear the Methane is used in industrial chemical processes for the forests of Vietnam, so that is could kill the Vietnamese guerilla production of hydrogen, methanol, acetic acid, and acetic hiding in the forest. But the Dioxin had many after effects anhydride, also used as a fuel in factories. like cancers, miscarriage, and birth defects in after years.
UPSC 2000
Q27. Which one of the following does a TV remote control unit explanation of A use to operate a TV set?
Correct Answer: (a)
Ultraviolet radiation inactivates / kills harmful micro oxygen or the material burnt under controlled atmosphere organisms in water only. of oxygen. It is an alternative to incineration. The gas
UPSC 2000
Q28. It will enable us to understand as to why elementary (c) Pulse Code Modulation particles have mass. (d) Time Division Multiplexing E 8 Topicwise Solved Papers 2. It will enable us in the near future to develop the 104. A ‘black hole’ is a body in space which does not allow any technology of transferring matter from one point to radiation to come out. This property is due to its:
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 2000
Q29. Assertion (A) : Large cold storage plants use ammonia as (a) no chain reaction takes place in nuclear reactor while refrigerant while domestic refrigerators use chlorofluoro- in the atomic bomb there is a chain reaction carbons. (b) the chain reaction in nuclear reactor is controlled Reason (R) : Ammonia can be liquefied at ambient (c) the chain reaction in nuclear reactor is not controlled temper
Correct Answer: (a)
Ammonia is used as a large scale refrigerant because it that of uranium) disintegrates into two nearby equal has highest refrigerating capacity per pound of any fragments with release of large amount of energy when large refrigerant and a number of other excellent thermal properties number of nuclei are brought closer together. In such a case that make it popular for a number of refrigeration applications the neutrons released, when one nucleus splits, strikes in spite of its being toxic, explos
UPSC 2000
Q30. Most of the explosions in mines occur due to the mixing of (b) an atom of helium
Correct Answer: (c)
Mixing of methane with air is the cause of most mining neutrons. explosions. Total number of nucleons = Number of protons +
UPSC 1999
Q31. A hunter aims his gun at a point between the eyebrows of a t t monkey sitting on a branch of a tree. Just as he fires, the x x monkey jumps down. The bullet will :
Correct Answer: (c)
As it is given that half life of given substance is 4 if we have today achieved the status of a 'developed months. country' in nuclear science and technology, it is in large The amount of substance left after 4 months = 1/2 measure a consequence of Dr. Ramanna's ideals, policies The amount of substance left after 8 months = 1/4 and efforts. Therefore the amount of substance decay in 8 months = (1 M. S. Swaminathan is an Indian agriculture scientist. He is – 1/4) = 3/4 known as the 'Father of the
UPSC 1999
Q32. For which one of the following is capillarity not the reason?
Correct Answer: (d)
Zirconium is non-radioactive substance as the Udipi Ramachandra Rao is a space scientist and former substance which have atomic number above 80 shows chairman of the Indian Space Research Organisation. Prof radioactivity. The rest three Astatine, Francium and Tritium Rao's experiments on a number of Pioneer and Explorer are radioactive in nature. There are five naturally occurring spacecrafts, led to a complete understanding of the solar isotopes of Zirconium: Zirconium-90, Zirconium-91, cosmic
UPSC 1999
Q33. Strips of two metals A and B are firmly jointed together as (a) The body has no acceleration (b) The body has a radial acceleration w2r directed toward shown in the figure.
Correct Answer: (b)
Anodizing or anodising in British English, is an easily in hard water. electrolytic passivation process used to increase the
UPSC 1999
Q34. Four wires of same material and of dimensions as under are (d) stretched by a load of same magnitude separately. Which 38. Low temperatures (cryogenics) find application in :
Correct Answer: (c)
Sodium metal is generally kept inside kerosene oil
UPSC 1999
Q35. In an air-conditioner, heat is extracted from the room (a) diamond to glass (b) water to glass air at the evaporator coils and is rejected out at the (c) air to water (d) air to glass condenser coils. 53. Match List I (Quantity) with List II (Units) and select the Which of these statements is/are correct? correct answer using the codes given below the lists:
Correct Answer: (c)
Yellow cakes generally denotes various compounds can be produced in predictable quantity and high activity of uranium like uranium oxides. by bombarding cobalt with neutrons. This is commonly used
UPSC 1998
Q36. A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s2. What will be its velocity after 2 seconds?
Correct Answer: (a)
Aufbau principle states that 'in the ground state of the Number of neutrons atom, the orbitals are filled in order of their increasing = 2 + 2 = 4 energies, starting with the orbital of lowest energy.' The Total number of nucleons = Mass number of an word aufbau is German word which means building up. element The increasing order of energy and hence that of filling of Thus mass number of alpha particle is 4 which is equal to orbitals is as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, mol
UPSC 1998
Q37. A fuse is used in mains electric supply as a safety device. [2011 - II] Which one of the following statements about the fuse is (a) Perpendicular to the direction S. correct?
Correct Answer: (c)
Cause of blast in a mine in generally mixture of methane temperature, electrical conductivity, dissolved oxygen, and air. CH in the main gas exerted from a mine, when it biochemical oxygen demand, chemical oxygen demand, 4 comes in contact with air, explosions take place. NH+ and NO– ion contents etc.
UPSC 1998
Q38. Consider the following phenomena: [2013 - I] (d) It must have very high resistance 1. Size of the sun at dusk. DIRECTION (Q. 79): The following item consists of two statements, 2. Colour of the sun at dawn one labeled as the Assertion (A) and the other as Reason (R). You 3. Moon being visible at dawn have to answer this item using the code given below. 4. Twinkle of stars in the sky 79. Assertion
Correct Answer: (b)
Compressed natural gas (CNG) is made by compressing Structure of ethylene glycol natural gas which is composed of methane (CH ), it also 4
UPSC 1998
Q39. One astronomical unit is the average distance between: DIRECTION (Q. 84 ): The following item consists of two statements,
Correct Answer: (b)
Carbon Monoxide pollution occurs primarily from would make H-CNG more expensive than CNG. So, #4 is emissions produced by fossil fuel powered engines. The wrong. By elimination we are left with answer B: only 2 and 3. incomplete reaction of air with fuel produces the colourless,
UPSC 1998
Q40. Which one of the following elements is essential for the 15. Match List I with List II and select the correct answer using construction of nuclear reactors?
Correct Answer: (c)
Zirconium purified metal is primarily used by the nuclear industry to form the outer layer of fuel rods in nuclear reactors.
UPSC 1998
Q41. Quark (a) barium allows X-rays to pass through the stomach on D. Integral spin 4. Photon account of its transparency to X-rays. E 18 Topicwise Solved Papers Codes: 28. Match List I with List II and select the correct answer using (a) A-2; B-3; C-1; D-4 (b) A-3; B-2; C-4; D-1 the codes given below the lists:
Correct Answer: (c)
Yellow cakes generally denotes various compounds can be produced in predictable quantity and high activity of uranium like uranium oxides. by bombarding cobalt with neutrons. This is commonly used
UPSC 1998
Q42. Sodium hydroxide 1. Ionic compounds are insoluble in alcohol. C. Baking soda 3. Magnesium sulphate 2. Ionic compounds in the solid state are good conductor D. Caustic soda 4. Copper sulphate of electricity. Codes: Which of these statements is/are correct? (a) A-3; B-4; C-2; D-1 (b) A-4; B-3; C-2; D-1 (a) Only 1 (b) Only 2 (c) A-3; B-4; C-1; D-2 (d) A-4; B-3; C-1; D-2 (c) Both 1 and 2 (d) Neither 1
Correct Answer: (a)
The charges used in the means like torch light and show up very well on ordinary X-ray pictures. However, if electric shaver etc. you drink a white liquid that contains a chemical called Nickel and cadmium are used as electrode in batteries. Nickel barium sulphate, the outline of the upper parts of the gut hydroxide as a positive and cadmium hydroxide is used as (oesophagus, stomach and small intestines) shows up clearly negative electrode in these batteries. The following chemical on X-ray pict
UPSC 1998
Q43. Bakery (a) Liquid sodium is employed as a coolant in nuclear D. Monopotassium 4. Gun powder reactors. tartarate (b) Calcium carbonate is an ingredient of tooth paste. Codes : (c) Bordeaux mixture consists of sodium sulphate and lime. (a) A-2; B-4; C-1; D-3 (b) A-2; B-3; C-1; D-4 (d) Zinc amalgams are used as a dental filling. (c) A-4; B-2; C-3; D-1 (d) A-4; B-2; C-1; D-3 19. Which one of the follo
Correct Answer: (c)
Yellow cakes generally denotes various compounds can be produced in predictable quantity and high activity of uranium like uranium oxides. by bombarding cobalt with neutrons. This is commonly used
UPSC 1998
Q44. Which one of the following metals does not form amalgam?
Correct Answer: (d)
Amalgam is an alloy consisting of mercury and any magnesium ions in soil which increases soil alkalinity. other element.Iron being exceptional in nature not form
UPSC 1997
Q45. The tendency of a liquid drop to contract and occupy minimum area is due to :
Correct Answer: (c)
Raja Ramanna India's Most Eminent Nuclear Physicist,
UPSC 1997
Q46. Which one of the following is a vector quantity?
Correct Answer: (c)
Zirconium purified metal is primarily used by the nuclear industry to form the outer layer of fuel rods in nuclear reactors.
UPSC 1997
Q47. A girl is swinging on a swing in sitting position. When the girl stands up, the period of swing will :
Correct Answer: (c)
Barium is given in adequate amount to patients before are detected by a light - sensitive cathode. X-ray examination. The gut (gastrointestinal tract) does not
UPSC 1997
Q48. The working principle of a washing machine is :
Correct Answer: (a)
Ammonia is used as a large scale refrigerant because it that of uranium) disintegrates into two nearby equal has highest refrigerating capacity per pound of any fragments with release of large amount of energy when large refrigerant and a number of other excellent thermal properties number of nuclei are brought closer together. In such a case that make it popular for a number of refrigeration applications the neutrons released, when one nucleus splits, strikes in spite of its being toxic, explos
UPSC 1997
Q49. A smooth plane inclined at an angle Q with the horizontal as shown in the given figure. A body starts from rest and slides down on the inclined surface. The time taken by the body to reach the bottom is:
Correct Answer: (c)
Mixing of methane with air is the cause of most mining neutrons. explosions. Total number of nucleons = Number of protons +
UPSC 1997
Q50. Which one of the following is paramagnetic in nature? 1 2 mirrors kept perpendicular to each other. S is the direction
Correct Answer: (c)
Bisphenol A, commonly abbreviated as BPA, is an carboxyhaemoglobin. Hydrogen fuel as such causes no organic compound with two phenol functional groups. pollution because on combustion with oxygen it forms water Bisphenol A is used primarily to make plastics which is used that's why it is also called future fuel. in making food packaging material.It is a key monomer in
UPSC 1997
Q51. The most reactive among the halogens is
Correct Answer: (a)
Fluorine is the most reactive among all halogens. in collisions with sodium atoms. Sodium also need not be However the reactivity decreases from F to I (from top to 2 2 pressurized since its boiling point is higher than the reactor's bottom of group) may be attributed to operating temperature. A disadvantage of sodium is its (1) Low dissociation enthalpies chemical reactivity, which requires special precautions to (2) High electron affinities prevent and suppress fires. If sodium comes into cont
UPSC 1996
Q52. A simple machine helps a person in doing:
Correct Answer: (b)
Each alpha particle contains two protons and two
UPSC 1996
Q53. A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be :
Correct Answer: (c)
Yellow cakes generally denotes various compounds can be produced in predictable quantity and high activity of uranium like uranium oxides. by bombarding cobalt with neutrons. This is commonly used
UPSC 1996
Q54. The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph:
Correct Answer: (b)
Nuclear fission is a perfect example of chain reaction. in radiation therapy for treatment of cancer. In case of nuclear fission a heavy atomic nucleus (such as
UPSC 1996
Q55. When a mirror is rotated by an angle q, the reflected ray will 1. Steam at 100°C and boiling water at 100°C contain same rotate by :
Correct Answer: (b)
German silver has a color resembling silver, but is an it. Polycarbonate panels are used for covering advertising alloy of primarily copper, nickel and zinc. Chlorargyrite is posters, construction of office buildings for sound proofing the mineral form of silver chloride (AgCl). It is also known and polycarbonate is also used for making bullet proof jackets. as horn silver. Proustite is a sulfosalt mineral consisting of
UPSC 1996
Q56. Consider the figure given below and answer the item that (b) Both A and R are true but R is not a correct explanation of A follows: P (c) A is true but R is false 2 (d) A is false but R is true 76. Domestic electrical wiring is basically a :
Correct Answer: (c)
The addition of silicates to synthetic detergents has value. Calorific value of charcoal, natural gas and gasoline are proved very beneficial. Silicates soften water by the (29,600; 43,000; 47,300 kJ/kg) respectively. Natural gas majorly formation of precipitates that can be easily rinsed away. consists of methane. Soluble silicates contribute to detergents as cleaning aids,
UPSC 1996
Q57. The voltage is usually 12 V. (a) 1 only 2. Electrolyte used is hydrochloric acid. (b) 2 and 3 3. Electrodes are lead and copper. 4. Capacity is expressed in ampere-hour. (c) 1 and 3 Which of the above statements are correct? (d) None of the above produces the thunder (a) 1 and 2 (b) 2 and 3 (c) 3 and 4 (d) 1 and 4 5337_DBE Physics E 7 82. Fluorescent tubes are fitted with a choke. The choke coil :
Correct Answer: (c)
Scintillation counter (scintillometer) : An instrument Zirconium's major use is as cladding for nuclear reactors. It is which measures gamma radiation. It is also used in airborne ideal for this use, as it has a limited ability to capture neutrons, and ground radiometre surveys. This instrument utilizes strength at elevated temperatures, considerable corrosion the flash of light emitted when the atoms of a suitable ' resistance, and satisfactory neutron damage resistance. phosphor' are energized
UPSC 1996
Q58. The alpha particle carries two positive charge. Its mass is (c) A is true but R is false very nearly equal to that of
Correct Answer: (b)
Each alpha particle contains two protons and two
UPSC 1996
Q59. Which one of the following elements is alloyed with iron to (a) Both A and R are true and R is the correct explanation of A produce steel which can resist high temperatures and also (b) Both A and R are true but R is not the correct explanation of A have high hardness and abrasion resistance?
Correct Answer: (b)
Steel is an alloy of iron and carbon. On mixing with one is spinning right and other to the left. carbon its strength and toughness got increased.
UPSC 1996
Q60. Match List-I (Naturally occurring substances) with List-II 26. Which one of the following is not an essential micronutrient (Elements) and select the correct answer using the codes for plants?
Correct Answer: (d)
Diamonds is the polymorph of the element carbon.
UPSC 1995
Q61. Who among the following anticipated Newton by declaring 9. A boy standing at the point O in the given diagram throws that all things gravitate to the earth?
Correct Answer: (a)
The charges used in the means like torch light and show up very well on ordinary X-ray pictures. However, if electric shaver etc. you drink a white liquid that contains a chemical called Nickel and cadmium are used as electrode in batteries. Nickel barium sulphate, the outline of the upper parts of the gut hydroxide as a positive and cadmium hydroxide is used as (oesophagus, stomach and small intestines) shows up clearly negative electrode in these batteries. The following chemical on X-ray pict
UPSC 1995
Q62. Optical fibre works on the principle of :
Correct Answer: (b)
Solder is a fusible metal alloy with a melting point or steel production. Developed countries like Japan, USA melting range of 90 to 450 degree Celsius (190 to 840 °F), have taken lead in making fertilisers using steel-making used in a process called soldering where it is melted to join slag, says 2018’s article in Financial Express So, #2 is metallic surfaces. It is especially useful in electronics and correct. plumbing. Solder is an alloy of lead and tin. • Steel Slag is used in road metal and
UPSC 1995
Q63. A hollow sphere of radius R, a hollow cube of side R and a 49. Suppose a rocketship is receding from the earth at a speed thin circular plate of radius R, made up of the same material, of 2/10 th the velocity of light. A light in the rocketship are all heated to 20°C above room temperature. When left to appears blue to the passengers on the ship. What colour cool in the room, which of them will re
Correct Answer: (a)
Synthetic detergents are sodium salt of long chain thiosulphate (Na S O ). sulphonic acid or alkyl hydrogen sulphate. Hardness in 2 2 3
UPSC 1995
Q64. An air bubble in water will act like a :
Correct Answer: (c)
Philosopher's wool is a oxide of zinc a white powder outside layer of the glass, but the layered polycarbonate used as a pigment, cosmetics, glass, inks and in zinc glass material is able to absorb the bullet's energy and stop ointment.
UPSC 1995
Q65. The efforts to detect the existence of Higgs boson particle 89. The technique used to transmit audio signals in television have become frequent news in the recent past. What is/are broadcasts is :
Correct Answer: (d)
Monosodium Glutamate (MSG) is a flavor enhancer
UPSC 1995
Q66. Locating groundwater resources (a) as the comet rotates around the sun, the lighter mass 3. Mineral exploration of the comet is pushed away due to the centrifugal 4. Telecommunications force alone 5. Traffic studies (b) as the comet rotates, the lighter mass of the comet is Select the correct answer using the code given below. attracted by some stars situated in the direction of its tail (a) 1, 2
Correct Answer: (a)
The charges used in the means like torch light and show up very well on ordinary X-ray pictures. However, if electric shaver etc. you drink a white liquid that contains a chemical called Nickel and cadmium are used as electrode in batteries. Nickel barium sulphate, the outline of the upper parts of the gut hydroxide as a positive and cadmium hydroxide is used as (oesophagus, stomach and small intestines) shows up clearly negative electrode in these batteries. The following chemical on X-ray pict
UPSC 1995
Q67. Which one of the following pairs of materials serves as in the pictures. electrodes in chargeable batteries commonly used in devices 9. Cobalt-60 is commonly used in radiation therapy because it such as torchlights, electric shavers etc.
Correct Answer: (a)
The charges used in the means like torch light and show up very well on ordinary X-ray pictures. However, if electric shaver etc. you drink a white liquid that contains a chemical called Nickel and cadmium are used as electrode in batteries. Nickel barium sulphate, the outline of the upper parts of the gut hydroxide as a positive and cadmium hydroxide is used as (oesophagus, stomach and small intestines) shows up clearly negative electrode in these batteries. The following chemical on X-ray pict
UPSC 1995
Q68. ‘Yellow cake’, an item of smuggling across border is
Correct Answer: (c)
Yellow cakes generally denotes various compounds can be produced in predictable quantity and high activity of uranium like uranium oxides. by bombarding cobalt with neutrons. This is commonly used
UPSC 1995
Q69. Which one of the following is a mixed fertilizer?
Correct Answer: (d)
Fertilizers are those compounds which provide without charcoal), but without the sulphur (or coal), the essential primary nutrients (nitrogen, phosphorus and powder is not as strong. potassium) required for healthy growth of plants and crops. Potassium sulfate is primarily used as a fertilizer. Nitrogeneous fertilizer provide nitrogen, phosphatic fertilizer Mono potassium tartrate is used in bakery by combination provide phosphorus whereas potassh fertilizer provide with baking soda it results i
UPSC 1995
Q70. The chemical used as a ‘fixer’ in photography is
Correct Answer: (b)
Sodium thiosulphate is used in photography as a fixer. antimatter counterpart of the electron. The positron has an It removes Ag from negative by dissolving unexposed silver electric charge of +1e, a spin of ½, and the same mass as an bromide resulting into formation of complex. electron. In physics, a photon is an elementary particle. Spin of a AgBr+2Na S O ¾¾®Na [Ag(S O ) ]+NaBr 2 2 3 3 2 3 2 photon can be –1 or +1. In a classical view we can say that