Midterm practice IGCSE Combined Science Physics Review

What is the difference between speed and velocity?

• Speed is the magnitude of velocity without direction.

• Speed is the rate of change of position with respect to time

• Velocity is the magnitude of speed without direction

• Speed and velocity are the same thing

A force of 20 N is applied to an object, and it moves a distance of 5 m. Calculate the work done.

• 100 J

• 25 J

• 50 J

• 75 J

Explain the process of conduction in thermal energy transfer.

• Conduction occurs through electromagnetic waves

• Conduction in thermal energy transfer occurs through direct contact between particles of a substance, leading to the transfer of kinetic energy and equalization of temperature.

• Conduction involves the transfer of mass between particles

• Conduction only occurs in gases

What is the unit of power?

• watt (W)

• ohm (Ω)

• ampere (A)

• volt (V)

Which equation describes Force?

• F = mv

• F = 2ma

• F = ma

• F = m/a

Calculate the kinetic energy of an object with a mass of 5 kg and a velocity of 10 m/s.

• 50 J

• 250 J

• 100 J

• 150 J

How does radiation transfer thermal energy?

• Radiation transfers thermal energy through conduction

• Radiation transfers thermal energy through mechanical waves

• Radiation transfers thermal energy through convection

• Radiation transfers thermal energy through electromagnetic waves.

Define the term 'convection' in the context of thermal energy transfer.

• Transfer of heat through the conversion of thermal energy into kinetic energy.

• Transfer of heat through the movement of solids due to differences in density and temperature.

• Transfer of heat through the movement of fluids due to differences in density and temperature.

• Transfer of heat through the emission of electromagnetic waves.

A force of 30 N is applied to an object, and it accelerates at 5 m/s^2. Calculate the mass of the object.

• 3 kg

• 8 kg

• 6 kg

• 10 kg

Explain the relationship between work and energy.

• Work is the transfer of energy, and energy is the capacity to do work.

• Work is the absence of energy

• Energy and work have no relationship

• Energy is the same as work