Q7 of 24 Page 73

Pressure is a scalar quantity because

During calculation of pressure, only the component of force that is normal to the surface is taken into consideration. It is defined as the ratio of magnitude of force normal to the magnitude of the area of the surface.

Hence,


Hence, pressure is a scalar quantity as it is a ratio of two scalars.

More from this chapter

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1

A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plot shown in Fig. 10.1, indicate the one that represents the velocity (v) of the pebble as a function of time (t).

 6

For a surface molecule

 8

A wooden block with a coin placed on its top, floats in water as shown in Fig.10.3. The distance l and h are shown in the figure. After some time, the coin falls into the water. Then

A. l decreases.


B. h decreases.


C. l increases.


D. h increase.



 9

With increase in temperature, the viscosity of

A. gases decrease.


B. liquids increase.


C. gases increase.


D. liquids decrease.