Short Answer Questions Chapter 1 Physics

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    SHORT ANSWER QUESTIONS

    Q1: What is the diference between base quantities and derivedquantities? Give three examples in each case.Ans:

    Base Quantities Derived QuantitiesBase quantities are thequantities n the basis ! whichall ther quantities areexpressed."xamples:#en$th% mass% time% electriccurrent% temperature% intensit&! li$ht and amunt ! substance.

    Derived quantities are thequantities which are expressedin terms ! Base quantities."xamples:'lume% speed% !rce% wr(%ener$&% pwer and char$e.

    Q): *ic( ut the base units !rm the !llwin$:+ule% ,ewtn% (ill$ramme% hert-% mle% ampere% metre% elvin%culmb and watt.Ans: il$ram% mle% ampere% metre and elvin are the base units.Q/: 0ind the base quantities invlved in each ! the !llwin$derived quantities:a2 speed b2 vlumec2 !rce d2 wr(Ans: a2 3peed:Derived !rm 4len$th and time5b2 'lume:

    Derived !rm 4len$th5c2 0rce:Derived !rm 4il$ram% len$th and time5d2 Wr(:Derived !rm 46ass% len$th and time5

    Q7: "stimate &ur a$e in secnds.Ans: 6& a$e in thirteen &ears. 8ts value in secnds is1/ &ears 9 1/ x /; x )7 x < 9 3ecnds.

    Q;: What rle 38 units have pla&ed in the develpment ! science?Ans: 38 units have pla&ed a ver& imprtant rle in the develpment

    ! science. 38 units are ver& help!ul t exchan$e scienti=c andtechnical in!rmatin at the internatinal level.

    Q: What is meant b& 'ernier >nstant?Ans: #east >unt ! 'ernier >alipers is called 'ernier >nstant.

    Q@: What d &u understand b& the -er errr ! a measurin$instrument?

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    Ans: When -er ! mveable 3cale des nt cincide with mainscale% then instrument has 4er "rrr5.

    Q: Wh& is the crrectin ! er "rrr necessar& in a measurin$instrument?Ans: >rrectin ! er "rrr is necessar& in measurin$ instrumentt btain an extreme crrect value.

    QC: What is a stpwatch? What is the least cunt ! a mechanicalstpwatch &u have used in the labratries?Ans: 3tpwatch is a device which is used t measure a time interval! an event. 6echanical stpwatches have least cunt upt

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    kilo-103 k

    mega- 106 M

    giga-109 G

    Q1/. Ew can we rund the number?Ans. F rund f whle numbers: 0ind the place value &u want theHrundin$ di$itH2 and l( t the di$it Iust t the ri$ht ! it. 8! thatdi$it is less than ;% d nt chan$e the Hrundin$ di$itH but chan$eall di$its t the ri$ht ! the Hrundin$ di$itH t -er.Q17. 8denti!& the base quantit& in the !llwin$:

    i2 3peed ii2 Area iii2 0rce iv2DistanceAns. Distance is the base quantit&.Q1;. 8denti!& the !llwin$ as base r derived quantit&:

    Densit&% !rce% mass% speed% time% len$th% temperature and vlume.Ans.

    Base Quantities Derived Quantities6ass% time% len$th% temperature Densit&% speed% vlume

    Q1. Fhe 3un is ne hundred and =!t& millin (ilmeters awa& !rm

    the "arth. Write this:

    a2 as an rdinar& whle number.Ans. 3un is nearl& 17C%;C@%@

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    b2 3crew $au$e

    Ans. 'ernier >alipers have a precisin !