Which of the following factors does not affect the rate of evaporation of a liquid?
temperature
volume
wind
surface area
Correct answer is B
The rate of evaporation depends on temperature, presence of wind, the humidity of the surrounding, and the surface area of the liquid exposed to the atmosphere. It doesn't depend on the mass of the liquid. The larger the surface area, the more would be the rate of evaporation.
Formation of hydrogen bubbles at the copper plate of a primary cell is called?
polarization
back e.m.f.
electrolysis
local action.
Correct answer is A
Polarization:The hydrogen bubbles which are clinging over the surface of copper electrode anode becomes a thin film of hydrogen over the copper electrode.
This hydrogen film increases the internal resistance and reduces the emf of the cell and hence the cell soon becomes inactive. This effect is known as polarization
Which of the following quantities is not an example of force?
Mass
Tension
Weight
Friction
Correct answer is A
Mass is a measure of how much matter is in an object.
In the diagram, MN//PO, < PMN = 112o, < PNO = 129oo and < MPN = yo. Find the value of y
51o
54o
56o
68o
Correct answer is B
In \(\bigtriangleup\) NPO + PNO + PNO + < NOP = 180o(sum of interior angles of a \(\bigtriangleup\) )
i.e. NPO + 129 + 37 = 180
< NOP = 180 - (129 + 37) = 14o
< MNP = < NOP = 14o (alt. < s)
In \(\bigtriangleup\) MPN
< PMN + < MNP + y = 180(sum of interior angles of a \(\bigtriangleup\))
i.e. 112 + 14 + y = 180o
y = 180 - (112 + 14) = 180 - 126 = 54o
11.1
10.5
10.3
9.9
Correct answer is A
No explanation has been provided for this answer.
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