Grade 9 Science 4th Quarter Review

Which of the following best describes the horizontal motion of a projectile?

• It follows a curved path.

• It remains constant throughout its trajectory.

• It accelerates continuously.

• It is influenced by gravity.

Which of the following factors affects the time of flight of a projectile?

• Initial velocity

• Mass of the projectile

• Angle of projection

• Height of release

What is the shape of the trajectory followed by a projectile in the absence of air resistance?

• Parabolic

• Circular

• Elliptical

• Linear

What is the relationship between the angle of release and the height of a projectile?

• The height is directly proportional to the angle of release.

• The height is inversely proportional to the angle of release.

• The height is not affected by the angle of release.

• The height is determined solely by the initial velocity

Answer explanation

What is the relationship between the angle of release and the range of a projectile?

• The range is directly proportional to the angle of release.

• The range is inversely proportional to the angle of release.

• The range will vary depending on angle of release

• The range is determined solely by the initial velocity

Answer explanation

Which is a necessary condition for the total momentum of a system to be conserved.

• An object must be at rest.

• Kinetic energy must not change.

• No external force is present.

• Only the force of gravity acts on the system.

What is an essential component of a model that demonstrates the conversion of heat into work?

• A heat source

• A mechanical device

• A temperature gradient

• A closed system

Which component of a heat engine is responsible for converting the mechanical work into useful output, such as electrical energy?

• Heat exchanger

• Combustion chamber

• Turbine or piston

• Condenser

What is the primary source of electrical energy in most power plants?

• Wind

• Water

• Solar

• Fossil fuels

What is the purpose of a transformer in an electrical power system?

• To generate electrical energy

• To transmit electrical energy

• To convert electrical energy into mechanical energy

• To step up or step down voltage for efficient transmission and distribution