AIEEE Exam

A student takes 50gm wax (specific heat = 0.6
kcal/kgºC ) and heats it till it boils. The graph
between temperature and time is as follows. Heat
supplied to the wax per minute and boiling point
are respectively
(A) 500 cal, 50ºC (B) 1000 cal, 100ºC
(C) 1500 cal, 200ºC (D) 3000 cal, 200ºC

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AIEEE Other Question

A wall consists of alternating blocks with a
length d and coefficients of thermal conductivity
K1 and K2. The cross sectional areas of the
blocks are the same. Then equivalent thermal
conductivity, of wall is:
Three physics faculty members sit in three
different cars at a railroad crossing. Three trains
go by at different (constant) speeds, each
emitting the same sound. Each faculty member
uses a cell phone to record the sound of
different train. On the next day, during a faculty
meeting, they plot the frequency as a function of
time on a computer, resulting in the plots shown
in the figure. Which of the three trains had the
highest speed

A) the one represented by the solid line
(B) the one represented by the dashed line
(C) the one represented by the dotted line
(D) impossible to tell