Physics Quiz

A 5 kg object is moving with a velocity of 10 m/s. What is its kinetic energy?

• 50 J

• 100 J

• 250 J

• 500 J

A car accelerates uniformly from rest to 20 m/s in 4 seconds. What is its acceleration?

• 4 m/s²

• 5 m/s²

• 6 m/s²

• 10 m/s²

Which Newton's law explains why passengers lurch forward when a moving bus suddenly stops?

• First Law

• Second Law

• Third Law

• None of the above

A 10 N force is applied to a 2 kg object. What is the object's acceleration?

• 2 m/s²

• 5 m/s²

• 10 m/s²

• 20 m/s²

A ball is thrown straight up with an initial velocity of 20 m/s. What is the velocity of the ball at its highest point?

• 20 m/s

• 9.8 m/s

• 0 m/s

• -9.8 m/s

What is the speed of sound in air at room temperature (25°C)?

• 343 m/s

• 300 m/s

• 280 m/s

• 400 m/s

Which property of a sound wave determines its pitch?

• Amplitude

• Wavelength

• Frequency

• Speed

What type of wave is a sound wave in air?

• Transverse

• Longitudinal

• Electromagnetic

• Standing wave

Which phenomenon explains the change in pitch of a moving siren?

• Reflection

• Doppler Effect

• Refraction

• Diffraction

In musical instruments, what determines the fundamental frequency of a vibrating string?

• String length

• String tension

• String mass per unit length

• All of the above