TNPSC Group I Exam-Previous Year Question Paper-Subject wise Analysed Questions-Science-Part 12

TNPSC Group I Exam-Previous Year Question Paper-Subject wise Analysed Questions-Science-Part 12

276.    A telescope and a microscope differ in that

 A)    both are different instruments                              

B)     telescope had eyepiece with larger focal lengths than the objective

C)    telescope has objective of large focal lengths and eyepiece of smaller Focal lengths

D)    none of these

Answer: (B)

277.    The centre of the Newton’s rings pattern is dark since,

            A)        the light undergoes a phase change p                           

B)        the glass plate and the plano - convex lens  are in

            contact with each other at the centre

C)        the light undergoes a phase change 2p

                                                                       p
D)        the light undergoes a phase change   2

Answer: (A)

279.    The apparatus used in submarines to give a clear view of the objects

on the surface of the ocean or ground known as

            A)        Periscope                     B)        Sextant

C)        Stereoscope                D)        Telescope

Answer: (A)

280.    Which metal is commonly used for making an electromagnet?

            A)        Copper                   B)        Iron

C)        Nickel                      D)        Cobalt

Answer: (B)

281.    Kilowatt-hour is a unit of

            A)        Energy                                   B)        Power

C)        Electric charge                     D)        Current

Answer: (A)

282.    Choke is used to

            A)        reduce the current in AC circuit

B)        reduce the current in DC circuit

C)        convert AC to DC

D)        convert DC to AC

Answer: (A)

283.    Piezo -electric effect is exhibited by

            A)        diamond               B)        quartz

C)        carbon                  D)        iron

Answer: (B)

284.    Isotopes have

            A)        the same atomic mass

B)        the dame atomic number

C)        the same proportion in different elements

D)        difference in mass

Answer: (B)

285.    Lunar caustic is

            A)        Sodium hydroxide

B)        potassium hydroxide

C)        Silver nitrate

D)        Sodium nitrate

Answer: (C)

286.    Which of the following is true?

            A)        A mineral cannot be an ore

B)        All minerals are ore

C)        All ores cannot be minerals

D)        all ores are minerals

Answer: (D)

287.    The colourless gas with the smell of rotten fish is

            A)        H₂S                             B)        PH₃

C)        C₂H₄                           D)        C₂H₂

Answer: (A)

288.    The fungicide Bordeaux mixture consists of

            A)        Borax and copper sulphate

B)        Borax and calcium hydroxide

C)        Boric acid and calcium hydroxide

D)        copper sulphate and calcium hydroxide

Answer: (D)

289.    The substance used in the manufacture of high voltage insulators is

            A)        Natural rubber            B)        Silicones

C)        Silicon carbide           D)        Synthetic rubber

Answer: (B)

290.    Tobacco is preserved form drying out in

            A)        Glycerol                                 B)        Glycol

C)        Ethanol                                  D)        Acetone

Answer: (A)

291.    The normal boiling point a liquid is the temperature at which

            A)        the vapour pressure of the liquid is zero

B)        the vapour pressure of the liquid is standard pressure

C)        the density of the liquid is unity

D)        the vapour pressure of the liquid is equal to the atmospheric pressure

Answer: (D)

292.    The shining particles seen in the path of beam from a projector

            in cinema halls is due to

            A)        shining particles emanating from projector

B)        scattering of light by dust particles in the path of the light

C)        Brownian movement of the dust

D)        electrical properties of dust particles

Answer: (C)

293.    Consider the following statements:

            I.          Amalgams are alloys containing Hg

            II.         Amalgams are always in liquid state

            III.        Amalgams are highly coloured alloys

            IV.       Amalgams are alloys which resist corrosion

            Of the statements:

            A)        I alone is correct

B)        I and II are correct

C)        I, II and III are correct

D)        All are correct

Answer: (A)

294.    What happens to the equivalent conductance of an electrolyte on dilution?

            A)        Decreases                             B)        Increases

C)        Remains constant

D)        May increase or decrease depending on the electrolyte

Answer: (D)

295.    Match List I with List II correctly and select your answer using the

codes given below:

                        List I                               List II

            a)         Antipyretics                 1.  Iodoform

b)         Antimalarial                  2.  Pencillin

            c)         Antibiotic                       3.  Lower the temperature

d)         Antiseptic                     4.  Chloroquine

Codes:

                        a          b          c          d

            A)        1          4          2          3

            B)        3          4          2          1

            C)        2          4          3          1

            D)        3          1          2          4

Answer: (A)

296.    Cotton fibre is made up of

            A)        protein                            B)        cellulose

C)        minerals                         D)        lignin

Answer: (B)

297.    Protein metabolism is carries out by

            A)        Vitamin A                    B)        Vitamin B₁

C)        Vitamin B₂                  D)        Vitamin D

Answer: (C)

298.    The first insecticide produced in India is

            A)        DDT                              B)        BHC

C)        Parathion                     D)        Chloral

Answer: (A)

299.    An ecosystem consists of

            A)        a living community and its environment

            B)        all the plants and animals of an area

C)        carnivores and herbivores of an area

D)        producers, consumers and decomposers in a particular locality

Answer: (D)

300.    Sexual reproduction is absent in which of the group of fungi mentioned

             below?

            A)        Deuteromycetes                   B)        Basidiomycetes

C)        Phycomycetes                     D)        Ascomycetes

Answer: (A)