8
MCQ (Multiple Correct Answer)
A wooden block with a coin placed on its top, floats in water as shown in figure.
The distance $l$ and $h$ are shown in the figure. After sometime, the coin falls into the water. Then,
A
$l$ decreases
B
$h$ decreases
C
$l$ increases
D
$h$ increases
9
MCQ (Multiple Correct Answer)
With increase in temperature, the viscosity of
A
gases decreases
B
liquids increases
C
gases increases
D
liquids decreases
10
MCQ (Multiple Correct Answer)
Streamline flow is more likely for liquids with
A
high density
B
high viscosity
C
low density
D
low viscosity
11
Subjective
Is viscosity a vector?
Explanation
Viscosity is a property of liquid it does not have any direction, hence it is a scalar quantity.
12
Subjective
Is surface tension a vector?
Explanation
No, surface tension is a scalar quantity.
Surface tension $=\frac{\text { Work done }}{\text { Surface area }}$, where work done and surface area both are scalar quantities.