1.
What is the formula for calculating pressure?
Correct Answer
A. Force divided by area
Explanation
The formula for calculating pressure is force divided by area. Pressure is defined as the force applied per unit area, so dividing the force by the area gives us the pressure. This formula is derived from the basic definition of pressure and is widely used in physics and engineering to calculate pressure in various situations.
2.
Which of the following is not an example of a fluid?
Correct Answer
E. Clay
Explanation
Clay is not an example of a fluid because fluids are substances that can flow and take the shape of their containers. Clay, on the other hand, is a solid material that is not capable of flowing or taking the shape of its container like liquids do. Therefore, clay does not exhibit the properties of a fluid.
3.
As you climb higher up a mountain, air pressure would:
Correct Answer
B. Decrease
Explanation
As you climb higher up a mountain, the air pressure decreases. This is because the higher you go, the less air there is above you, resulting in fewer air molecules exerting pressure on you. The decrease in air pressure can also lead to a decrease in oxygen levels, making it harder to breathe at higher altitudes.
4.
An increase in the depth of water creates what kind of change in water pressure?
Correct Answer
B. Increase
Explanation
When the depth of water increases, it exerts more weight or force on the water below it. This increased weight results in an increase in the pressure exerted by the water. Therefore, an increase in the depth of water creates an increase in water pressure.
5.
One pascal is equal to:
Correct Answer
B. 1 Newton of force per square meter
Explanation
The correct answer is 1 Newton of force per square meter. Pascal is the SI unit of pressure, defined as one newton of force per square meter. It is named after the French mathematician, physicist, and philosopher Blaise Pascal, who made important contributions to the study of fluids and pressure. This unit is commonly used in scientific and engineering contexts to measure and quantify pressure.
6.
Which of the following is not an example of a hydraulic system?
Correct Answer
D. Computer
Explanation
A hydraulic system uses fluid to transmit power and operate machinery. The brakes of a car, ladder of a fire truck, and car jack are all examples of hydraulic systems as they use fluid to generate force and perform their intended functions. However, a computer does not operate on hydraulic principles. It relies on electronic components and does not utilize fluid power to function. Therefore, a computer is not an example of a hydraulic system.
7.
What force makes you feel lighter in the water?
Correct Answer
C. Buoyant force
Explanation
The buoyant force is the force that makes you feel lighter in the water. When an object is submerged in a fluid, such as water, it displaces a certain amount of fluid. According to Archimedes' principle, the buoyant force acting on the object is equal to the weight of the fluid displaced. This upward force counteracts the force of gravity, making you feel lighter in the water. Therefore, the correct answer is buoyant force.
8.
The amount of matter in an object is called:
Correct Answer
C. Mass
Explanation
Mass refers to the amount of matter in an object. It is a fundamental property of matter and is measured in units such as kilograms or pounds. Volume, on the other hand, refers to the amount of space occupied by an object. Area is the measure of the size of a surface, while length refers to the measurement of the distance between two points. Therefore, out of the given options, mass is the correct term for the amount of matter in an object.
9.
The amount of space an object takes up is called:
Correct Answer
A. Volume
Explanation
Volume is the correct answer because it refers to the amount of space that an object occupies. It is a measure of the three-dimensional space that an object occupies and is commonly measured in cubic units such as cubic meters or cubic centimeters. Area refers to the amount of space occupied by a two-dimensional object, mass refers to the amount of matter in an object, and length refers to the measurement of the size or distance of an object in one dimension.
10.
What is the formula for density?
Correct Answer
C. Mass divided by volume
Explanation
The formula for density is mass divided by volume. Density is a measure of how much mass is contained within a given volume. By dividing the mass of an object by its volume, we can determine how tightly packed the particles are within the object.
11.
Which of the following is the Archimedes principle?
Correct Answer
B. The buoyant force of an object is equal to the weight of the fluid displaced by an object.
Explanation
The Archimedes principle states that the buoyant force exerted on an object immersed in a fluid is equal to the weight of the fluid displaced by the object. This means that when an object is placed in a fluid, it will experience an upward force that is equal to the weight of the fluid that is pushed aside or displaced by the object. This principle helps explain why objects float or sink in fluids, and it is the basis for understanding the concept of buoyancy.
12.
In order for an object to float in a container of water its density must be:
Correct Answer
B. Less than 1 gram per cubic centimeter
Explanation
An object will float in water if its density is less than 1 gram per cubic centimeter. This is because the density of water is 1 gram per cubic centimeter, so if the object is less dense than water, it will displace an amount of water that weighs more than the object itself, causing it to float.
13.
In order for an object to sink in a container of water, its density must be:
Correct Answer
A. Greater than 1 gram per cubic centimeter
Explanation
An object will sink in water if its density is greater than 1 gram per cubic centimeter. This is because the density of water is 1 gram per cubic centimeter, so an object with a higher density will be heavier than the water it displaces and will sink. Conversely, if the object's density is less than 1 gram per cubic centimeter, it will be lighter than the water and will float. If the object's density is exactly 1 gram per cubic centimeter, it will be neutrally buoyant and will neither sink nor float.
14.
If an object has a mass of 50g and a volume of 10 cubic centimetres, what would be its density?
Correct Answer
A. 5 g/cc
Explanation
The density of an object is calculated by dividing its mass by its volume. In this case, the object has a mass of 50g and a volume of 10 cubic centimeters. By dividing 50g by 10 cubic centimeters, we get a density of 5 g/cc.
15.
If an object has a mass of 4 grams and a volume of 8 cubic centimetres, what would be its density?
Correct Answer
B. .5 g/cc
Explanation
The density of an object is calculated by dividing its mass by its volume. In this case, the mass of the object is 4 grams and the volume is 8 cubic centimeters. Therefore, the density would be 4 grams divided by 8 cubic centimeters, which equals 0.5 grams per cubic centimeter.
16.
If an object has a density of .04 g/cc and it is put in a container of water, what would happen to it? (hint: Water has a density of 1 g/cc)
Correct Answer
B. It would float
Explanation
The object would float because its density is lower than that of water. When an object is placed in a fluid, it will float if its density is less than that of the fluid. In this case, the object's density is 0.04 g/cc, which is much lower than the density of water (1 g/cc). Therefore, the object would experience an upward buoyant force that is greater than its own weight, causing it to float.
17.
If an object has a density of 14g/cc and it is put in a container of water, what would happen to it? (hint: Water has a density of 1g/cc)
Correct Answer
A. It would sink
Explanation
An object with a density of 14g/cc is denser than water, which has a density of 1g/cc. According to Archimedes' principle, an object will sink if its density is greater than that of the fluid it is placed in. Therefore, the object would sink when placed in water.