Properties Of Matter Test

Result

Properties Of Matter Test - 1

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Question 1
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A light rod of length 2 m is suspended from the ceiling horizontally by means of two vertical wires of equal length tied to its end. One of the wires is made of steel and is of cross-section 0.1 cm². The other wire is of brass of cross-section 0.2 cm². A weight is suspended from a certain point of the rod such that equal stresses are produced in both the wires. Which of the following is correct?

A
The ratio of tensions in the steel and brass wires is 0.5

B
The load is suspended at a distance of 130/3 cm from the steel wire

C
Both (a) and (b) are correct

D
Neither (a) nor (b) is correct
Question 2
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What change in surface energy will be noted when a drop of radius R splits up into 1000 droplets, each of radius ‘r’ surface tension is T.

A
4πR²T

B
7πR²T

C
16πR²

D
36πR²T
Question 3
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Two spherical soap bubbles coalesce. If V is the consequent change in volume of the contained air, S is the total change in surface are and is the surface tension of soap solution, then

A
P₀V + 4Sσ = 0

B
3P₀V + 4Sσ = 0

C
4P₀V + 3σS = 0

D
P₀V - σS = 0