GreenHallAcademy
TestSession~2019-20 TotalMarks:30
Name:
Class:1styear
Date:31-December-2019
Test:Physics
Chapter:1(Measurements)
TimeAllowed:1hour
MultipleChoiceQuestions(MCQ's).
Q1.Encircleortickthecorrectanswer. (1×8=8)
(i).Whichofthefollowingisleastmultiple?
(a)pico (b)femto (c)nano (d)atto
(ii).Thesolidanglesubtendedatthecentrebyasphereis:
(a)2π (b)4π (c)6π (d)8π
(iii).SIunitofintensityoflightis:
(a)ampere (b)mole (c)candela (d)joule
(iv).Significantfiguresin0.0010are:
(a)1 (b)2 (c)3 (d)4
(v).1tera= (a)10
15 (b)10
18 (c)10
12 (d)10
-12
(vi).Whichisacorrectrecordforthediameterofwirewhenmeasuredbyascrewguageofleastcount0.001cm?
(a)2.3cm (b)2.31cm (c)2.312cm (d)2.3124cm
(vii).Astudentaddedthreefigures72.1,3.32and0.003.Thecorrectanswerregardingtherulesoftheaddition
ofthesignificatfigureswillbe:
(a)75.423 (b)75.42 (c)75.4 (d)75
(viii).Theratioof1femtometerto1nanometeris:
(a)10⁻⁶ (b)10⁶ (c)10⁻⁷ (d)10⁸
Q2.WriteShortanswerstoanysix(6)questions. (2×6=12)
(i).Givethedefinitionofunitofsolidangle.
(ii).Whatarethecharacteristicsofanidealstandard?
(iii).Definebasequantitiesandderivedquantities.
(iv).Differentiatebetweenrandomandsystematicerror.
(v).Nameseveralrepetitivephenomenonoccurringinnaturewhichcouldserveasreasonabletimestandards.
(vi).Whatarebaseunits?Nameallofthem.
(vii).ShowthattheEinstein'sequationE=mc²isdimensionallycorrect.
(viii).Whatarethemainfrontiersoffundamentalsciences?
Note:AttemptanyTwo(2)longquestions. (5×2=10)
Q3.Suppose,wearetoldthattheaccelerationofaparticlemovinginacircleofradiusrwithuniform
speedvisproportionaltosomepowerofr,sayr
n
,andsomepowerofv,sayv
m
,determinethe
powersofrandv?
Q4.Thespeedvofsoundwavesthroughamediummaybeassumedtodependon
(a)thedensityρofthemediumand(b)itsmodulusofelasticityEwhichistheratioofstressto
strain.Deducebythemethodofdimensions,theformulaforthespeedofsound.
Q5.Whataresignificantfigures?Writesomerulestoidentifysignificantfigures.
