Pressure And Properties of Matter - SS1 Physics Past Questions and Answers - page 1
Which of the following statements best defines pressure?
The force exerted per unit area
The distance travelled by an object
The rate at which an object moves
The amount of matter in an object
Which of the following factors affects the pressure exerted by a given force?
The size of the object
The colour of the object
The temperature of the object
The area over which the force is applied
Which of the following units is commonly used to measure pressure?
Newtons
Joules
Pascals
Kilograms
Which of the following is an example of an application of pressure?
Inflating a balloon
Mixing two chemicals
Turning on a light switch
Writing with a pen
What happens to the pressure in a fluid as the depth increases?
The pressure decreases
The pressure remains constant
The pressure increases
The pressure fluctuates
Explain what pressure is and how it is defined. Provide examples of everyday situations where pressure is encountered.
Pressure is defined as the force exerted per unit area. It measures how much force is distributed over a given area. For example, when you press your hand against a table, the force you apply is spread out over the surface area of your hand, resulting in pressure. Similarly, when you inflate a balloon, the air inside exerts pressure on the walls of the balloon.
Discuss the relationship between pressure and depth in a fluid. How does pressure change with increasing depth?
In a fluid, pressure increases with increasing depth. This is because the weight of the fluid above exerts a force on the lower layers, resulting in increased pressure. The deeper you go underwater, the greater the pressure you experience due to the weight of the water above you. This is why divers may feel pressure on their ears as they descend to greater depths.
Describe the unit commonly used to measure pressure and provide its definition. How is it related to other units of measurement?
The unit commonly used to measure pressure is the Pascal (Pa). One Pascal is equal to one Newton per square meter (N/m²). It represents the amount of force exerted over a given area. Pascal is related to other units of measurement, such as Newton (unit of force) and the square meter (unit of area), through the definition of pressure as force per unit area.
Pascal's principle states that:
Pressure in a fluid decreases with depth
Pressure in a fluid is directly proportional to its density
Pressure applied to a fluid is transmitted equally in all directions
Pressure in a fluid increases with temperature
According to Pascal's principle, an increase in pressure applied to a confined fluid will result in:
An increase in the fluid's volume
A decrease in the fluid's density
A decrease in the fluid's pressure
An increase in pressure at all points in the fluid