Round 3

What is pressure in a fluid?

• The total force that a fluid exerts on an object submerged in it.

• The force per unit area exerted by a fluid at a point.

• The difference in height between two points in a fluid.

• none

Which of the following statements about heat and temperature is correct?

• Temperature is the transfer of thermal energy between two objects with different temperatures.

• Heat is a measure of the level of thermal energy in an object.

• Temperature and heat are the same physical quantity.

• Temperature is a measure of the average kinetic energy of particles in an object, while heat is the transfer of thermal energy between two objects with different temperatures.

Acceleration is defined as the change in:

• Pressure of an object.

• Mass of an object.

• Velocity of an object.

• Velocity of an object per unit of time.

Which of the following options is a unit of energy in the International System?

• Newton

• Watt

• Kelvin

• Joule

Which of the following statements is correct about gravitational force?

• The gravitational force between two objects is directly proportional to the mass of both objects.

• The gravitational force between two objects is inversely proportional to the distance between them.

• Gravitational force only acts on objects at the surface of the Earth.

• The gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Which of the following options is a form of heat transfer that does not require a material medium?

• Conduction

• Convection

• Radiation

• neither option seems correct

What property of a fluid is related to its resistance to flow?

• Viscosity

• Density

• Pressure

• neither option seems correct

What is the acceleration of an object in free fall near the surface of the Earth?

• 0 m/s²

• 9.8 m/s² upwards

• 9.8 m/s² downwards

• 9.8 m/s² to all directions

Which of the following statements is correct about mass and weight?

• Mass is a measure of the amount of matter in an object, while weight is a measure of the gravitational force on that object.

• Mass and weight are the same physical quantity.

• Mass is a measure of the gravitational force on an object, while weight is a measure of the amount of matter in that object.

• neither option is correct

Which of the following options is a unit of measure for velocity?

• Newton

• Meter

• Second

• Meter per second