AIEEE Exam

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:

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AIEEE Other Question

Two wires are kept tight between the same pair
of supports. The tensions in the wires are in the
ratio 2 : 1. The radii are in the ratio 3 : 1 and the
densities are in the ratio 1 : 2. The ratio of their
fundamental frequencies are -
(A) 1/2 (B) 2/3
(C) 3/4 (D) 4/9
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