1. ;!"i,
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'TIme:3 hrs
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Session Ending Examination 2}t3.t4
: i,:lr i ti.,: '; ,
r Fhy5ics
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Class-Xl
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fvlM.70
i':tt"ri'il ili!
itt1,,y':.,;1", ltt
(c)
(d)',
(e) .!i . I.
['1'
.2.
,6.
percentage,:,error in,the 4o/o
the
and
:? rf
respectively. What. is the

2. value of X calculated
off the result?
o1 the,,basic gf aboyq: relation is 2.7,.63, !o whatlvalue,Ehould round
'9,-
*7. State and Prove work-energy theorem.
8.
9.
10:
11.
13. what is limiting friction? state the laws of limiting friction. o.Rn" t1.,"
; li l,r: ii,. i. . r''
qf 5m/s
sink at
t2.
14.
15.
byildi4g end
,
Which, ig,, of
crew,and
'i..

3. 16.
L7.
18.
20.
the ceiling:by, ,,,.rn, of thin,wiie.r CalcutatF,.Ihe hei'dht to.which, block rises' Also
estimatetheamountofheatprodqcedintheblock..,
Define esgape velocity. Derive an expresbion for the escape velocity of an object from
-;:!:, "......t .. .".'-, I , ....- ..-. .,: . : ...:
the'surface of earth. Does it depend on the location from where it is projected?-.:--:a::-:-.'--.:..._-._i-.,,.,:-i,,:].,,,
Define,.surface,terl,sjp-1,1.,,D-,eriye, an,.qxprp.sq[on,.-for t.[g gxcess ,p-ressur-e insidei lhe liquid. .....r.,-,, .i...,. .,.rlr .
:
,.^. ., i ...'--
r;: oR
, --What.ig
glgstlc gotenlllf engrgy?,-DS.r"iyg,en;,,9xp,1e9sign,fg["thg.etastic potentiq! energy.:.: :;:: -. r,,l'r r:,: i:. . : ,i,,,:. ..1'"
j., ;',:; i.
stole{ in stretched string. l-i::,r , r .,'lt "':r :lr I
19r.lt-:,Whatr ipi an isothernnal proces5.?, Derive
, ,,.,,i isoth,.errrma!,pr:oc-€gs,1 .,
,i, i,,.,,,,,.,..1,
l
an expression for the wor:k done during an
2L,
22.
23.
Write the Newtonrs formula for the speqd of sound in air. What was wrong with this
formula? What correction was made by Laplace in this formula?.-_-,
Explain Doppler's effegt in sound. Obtain an expression for the apparent frequency of
:,F.eqnd-.(!) ry,'hren,,,l,oVt.9 is moving tgwards statiglqry gUr",1r9-1ry nifgr,p velocity. (ii)
S.3yita ryaE:poUring:hot_te.a in a.thic(lwilled glass.tumb!b1, The glags tumbler. cracked.
: -, - -.-__':
Savita asked her sister Promila about it, who was the science student. Savita was
"satisfie..dbyhersister1sexplanation..li'-'i --- - --''r':-''--'-1."
: .-
(i) What explanation was given by promila?
.
(ii),,.,r,,.:r.,Whe!!ffi
1,n1,bv,gh9rng,l gxffiion?
24.
(iii) What are the values shown bv Pr:omila?
(a),, : What,is,F,r:ojectile? A'proiegtile is fired with a velocity u making an angle 0 with
....horizo4tal.Showthatitstrajectoryisparabota.',.',.

4. f'.:
Maximum' vertical' heieht (iii)
25.
iB.-
,rM*
i1"';.l
,(b)
:.:l iriil
State'the perpendicular and parallel axis theorem on moment of inertia. The moment of
."
inertia bf disc of mass M and radius R about any of its diametei is MR' /4, find the
,
moment of inertia of disc (il,Ab9ut it axis (ii)'About tl,re
1*ir'i,o,ll"t 1o ltte
disc
1nd
: ' " " ..,'
pu,iingthroughapointonitsedge..(iii)About'thetangeritinits.plane
.t
.-:r'-'..,,.
26. (a) State and prove Bernoulli's theorem. (b)ln a test experiment on a model .aero
i plrn" in a wind tunnel, the flow speed on the upper and lower surfaces of the
OR
.:
OR
. : .-
i'
^ ;
is 2.5m2; DensitY of air is 1;3 Kg/m'. :r 1:_ | i.
(a) . What is,Ven!.q{meterf :Describq it{,sworki.ngr&"find the required exPression;r r,"'
(b) , The cylin"tr:icaittube of u qn1.f pump has a,cross-seciien of 8cm1, one en1-ot
w!.rich. has 40 fine hofes,,gach of diameter L 0mm; tt the'liquld tlow inside the
tube is 1,5mfminute, w6r, ,r tf',e lpaeilaf'eiection of:tiquid"thr*gh the holes?l