4Thanks subhomoy & anirudh
u're right
1 ---> x
2 ---->√
3 ----> √
4 ----> √ (or assume qs to be wrong)
[159]
The water equivalent of a copper calorimeter is 4.5g. If specific heat of copper is .09 cal /g/°c, then:-
(1) Mass of the calorimeter is .5 kg
(2) Thermal capacity of the colorimeter is 4.5 cal /° C
(3) The heat required to raise the temperature of the calorimeter by 8° C will be 36 cal.
(4) Heat required to melt 15 gm of ice placed in the colorimeter will be 1200 cal
CHOSE THE CORRECT OPTION FROM BELOW
(A) 1 is correct (B) 2,3 only are correct
(C) 2,3,4 are correct (D) 3,4 only are correct
-
UP 0 DOWN 0 0 33
33 Answers
4Thermal cap is same as heat cap
If u r still not convinced leave it & plzz post the right ans with proper units !!!!
492 and 3 are surely correct....so atleast option b is correct...
now if we can assume initial temperature to be 0°C then option c
else option b
449avinav this is to clarify ue doubt...
no 2 option is correct...coz thermal capacity is not specific heat capacity it is the temp reqd to raise the temp the temp of any body of any mass by 1°C .... irrespective of mass....so thermal capacity of similar materials of diff masses is different...
thermal capacity=specific heat capacity*mass of body=heat capacity..[1]
4Ya subhomoy u're right
but heat capacity = thermal capacity
specific heat capacity ≠thermal capacity
[127]
49@UTTARA....in #15 u were asking for some calculations...bt wat calculations???[3]
1I DON'T THINK THERE IS WRITTEN THAT HEAT CAPACITY IS SAME AS THERMAL CAPACITY......ISN'T IT?
1if what u defined thermal capcity as then it is easy cALCULATION
T.CP.=MS=4.5G*1CAL/C-G=4.5CAL/C
[1]
49exactly the mumerical value of thermal capacity in cal g-1 °C-1 equals water equivalent in g...[1][1]
1Yes the correct answer is option C,although i made mistake in this one by putting B thinking calorimeter will absorb heat,forgetiing that there wasnt any temp change[2].
btw,this one is also from the full tests mailed from fiitjee, uttara?
and have u got the next 4 that were to be sent to us on receiving photocopy of IITJEE form?
1CALCULATE IT IF THERE IS SOME ANGLE THEN ADD COS FUNCTION AT NUMERATOR Q = THE ANGLE Q THETA
4It's same as heat capacity / thermal capacity
Didn't u read the link[3]
1@UTTARA........
THERMAL MASS......LOLZZZZZZZZ[3]
QUESTION IS TALKING OF THERMAL CAPACITY!!!
4c this
http://en.wikipedia.org/wiki/Thermal_mass
So 2 is √
But i want the calculation part
1SOURCE:::::::http://composite.about.com/library/glossary/t/bldef-t5508.htm
Thermal Capacity
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Definition: The quantity of heat necessary to produce a unit change of temperature in a unit mass of a substance. In SI, the unit is to the joule per kilogram kelvin (J/kg-K).
Definition Copyright ©1989 CRC Press LLC. All rights reserved.
4Let's make it this way
1 ---> x
2 ---->(I dint understand how it is true [7])
3 ----> √
4 ----> Qs wrong
1NO WAY WE CAN'T ASSUME ANYTHING LIKE OUR OWN WILL LOLLLLLLLL!!!![3][3]
1hey jamesbond .
nothing given we should be safely be able to assume that it is at O