Advertisements
Advertisements
प्रश्न
Pressure is a scalar quantity because ______.
- it is the ratio of force to area and both force and area are vectors.
- it is the ratio of the magnitude of the force to area.
- it is the ratio of the component of the force normal to the area.
- it does not depend on the size of the area chosen.
Advertisements
उत्तर
b and c
Explanation:
Pressure is defined as the ratio of the magnitude of component of the force normal to the area and the area under consideration.
i.e, P = F/A
Pressure is a scalar quantity. Pressure acts normal on a surface and it is always compressive in nature, therefore, only its magnitude is required for its complete description.
APPEARS IN
संबंधित प्रश्न
A large He balloon of volume 1425 m3 is used to lift a payload of 400 kg. Assume that the balloon maintains constant radius as it rises. How high does it rise? [Take y0= 8000 m and `rho_"He"`= 0.18 kg m–3].
For a given thrust, pressure is more on a surface of large j area.
The pressure on a surface increases with an increase in the thrust on the surface.
The unit of pressure is .........
Pressure is reduced if .................... increases.
When does a man exert more pressure on the floor: while standing or while walking?
A gum bottle rests on its base. If it is placed upside down, how does the thrust change?
The base of a container measures 15 cm × 20 cm. It is placed on a table top. If the weight of the container is 60 N, what is the pressure exerted by the container on the table top?
A boy weighing 60 kgf stands on platform of dimensions 2.5 cm x 0.5 cm. What pressure in pascal does he exert?
Consider the statement given below and choose the correct option.
Assertion: Sharp knives are used to cut the vegetables.
Reason: Sharp edges exert more pressure.
A drinking straw works on the existence of ______.
A water tank has four taps fixed at points A, B, C, D as shown in the following figure. The water will flow out at the same pressure from taps at
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
Pressure is directly proportional to the area of contact.
What is thrust?
Why dams are made stronger and thicker at the bottom than at the top?
Give reasons why:
a single nail pricking the body is painful when compared to lying on a bed of nails.
All flowing substances, both liquids, and gases are called ______.
Hot air is ______ dense than ordinary air.
The shape and size of the solids do not easily change.
