19)c
for perfectly elastic body e=0 hence y is infinte
but for perfectly inelastic body y=0
MORE ADDED1.A beaker containing water is balanced on a pan of a common balance.A solid of specific gravity 1 and mass 5 g is tied to the arm of the balance and immersed in the water of the beaker.The scale pan with the beaker:
a)goes up
b)goes down
c)remains unchanged
d)none
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75 Answers
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19.Youngs modulus for perfectly inelastic body:
a)finite b)1 c)0 d)∞
ans given 0,but me gettin ∞ plz verify
10.A satellite is orbiting close to a planet.its time period depends only on:
a)density of planet b)mass of planet c)radius of planet d)mass of satelliteans A[7]
106>C=O includes ketonic as well as aldehydic grp so. (c) is most accurate
1@manmay
in that case glucose has -CHO AND -OH groups....so (c) is also wrong
1but wat abt the case of fructose that doesn't have CHO, it has >C=O and -OH
so in general case carbohydrate have >C=O and -OH group, hence (c) is correct
39Specific gravity 1 implies the solid's density is 1 x density of water = 1000 kg/m3
Mass = 5 x 10-3 kg
Volume = Mass/Density = 10005 x 10-3
= 200 x 103 = 2 x 105 m3
Forgot the concept of a common balance. haha..
13Me adding a Qn too... EEE09,
8)The two functional groups present in a typical carbohydrate are :
(a) – OH and – COOH (b) – CHO and – COOH
(c) > C = O and – OH (d) – OH and – CHO
Ans's given only (c)... both (c) & (d) are rite but...?
13Anand,
I know u know all this, but do read it
wht u are saying as "Decrease in Vapour Pressur" is actually u mean this---
ΔVP = VP(when only hexane) - VP(after adding ethanol to initial)
Agreed, ki V Pr. mein decrease aayegaa....but DEviation is on a different note.
MAtlab agar v hav a sol.n of hexane n ethanol, whtever be their resp. quantities,,,,
We expect a ..
Net VP = Σ(moleFrac)*(resp Absolute VP)
But v dont get tht,
Experimental VP > Net expected VP => +ve Deviation.
This is deviation matlab....v can't say tht since Ethanol has reduced Hexane's VP frm its Absolute VP means it is -ve Deviation.... We can't use the term "-ve Deviation" in this context.
13Oh yeah, i was thinking smthing wierd fr Q1... thnx there anand :)
Q7) 1st thing... No chance off association, so no -ve deviation.
Ideal sol.n tab hota hai jab there are milte-julte sol.n(s)... like C2H5Cl & C2H5Br; or a bit close Mol. wt.(s)
So, it has to be +ve Deviation.
(I know there was an absurd sort of option 4, where they say C2H5OH will have -ve & hexane +ve deviation; smthing like tht, but deviation is not 2b defined fr a single entity, it is a concept fr a mixture of volatile solutions.)
17.a binary liq soln is prep by mixin n-heptane and ethanol.now is there any way to find out whether the soln wil be ideal or+ve deviation or -ve deviation wil b shown by it?q of this type came in aieee 2009
1let weight of particle w,tension in thread be T,buoyant be B
T+B=w -----> B=w-T........but B=w----->T=0
for water in beaker N(initial)[without solid]=W
N(final)=B+W=B+w-T=w clearly W>w so N(inital)>N(final) so pan shud move up.
hence A is correct!
1and ya Alumono thermite one was easy confused it with another reacn[3]
1Ya thanks avik regarding smelting q[1]
but the answer given by saket reagrding question 1 is right.
its a)goes up.saket,plz explain ur logic me too thought it was c.