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
Explain why The blood pressure in humans is greater at the feet than at the brain
A 50 kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter 1.0 cm. What is the pressure exerted by the heel on the horizontal floor?
The pressure on a surface increases with an increase in the thrust on the surface.
A man exerts same pressure on the ground whether he is standing or he is lying.
Pressure is the thrust acting on a surface of ........... area.
Define the term ‘pressure’ and state its unit.
A gum bottle rests on its base. If it is placed upside down, how does the thrust change?
How much thrust will be required to exert a pressure of 20,000 Pa on an area of 1 cm2.
A boy weighing 60 kgf stands on platform of dimensions 2.5 cm x 0.5 cm. What pressure in pascal does he exert?
Multiple Choice Question.
A hydraulic lift is designed to lift heavy objects of maximum mass 2000 kg. The area of cross-section of piston carrying the load is 2.25 × 10-2 m2. What is the maximum pressure the smaller piston would have to bear?
An air bubble of radius 0.2 mm is situated just below the water surface. Calculate the gauge pressure. Surface tension of water = 7.2 × 10−2 N/m.
Consider the statement given below and choose the correct option.
Assertion: Broad straps are used in bags.
Reason: Broad straps last for long.
Give reasons why:
a single nail pricking the body is painful when compared to lying on a bed of nails.
Give reasons why:
cutting edges of knives and axes are sharpened.
Give reasons why:
heavy trucks are fitted with 6 to 8 wheels
Intermolecular forces are stronger in ______.
The pressure in mines is ______ than the sea level.
The shape and size of the solids do not easily change.
Upthrust = weight of the fluid displaced – apparent weight of the object.
Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is ρi = 0.917 g cm–3?
