REVISION TEST-GRADE 8(PHYSICS)

Army tank tracks are useful for travelling through the mud because..

• they decrease the force the vehicle exerts on the ground
• they increase the force the vehicle exerts on the ground
• they decrease the pressure the vehicle exerts on the ground
• they increase the pressure the vehicle exerts on the ground

During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is___________

• force of gravity

• electrostatic force.

• force of friction.

• magnetic force

A camel can walk in deserts more easily as compared to horse donkey and others because its

• Feet are smaller

• Weight is lesser

• Feet are broader

• Heavier body

Watch the green man. Which force(s) are acting in this situation?

• Frictional Force only.

• Gravitational Force only.

• Muscular Force only.

• Muscular and Gravitational Force.

You and your friend are playing tug of war. Your friend pulls with a force of 55 N to the right. You pull with a force of 65 N to the left. What is the net force on the rope?

• 20 N left

• 20 N right

• 10 N left

• 10 N right

__________________________ is the number of times a sound wave vibrates in a given time.

• intensity
• frequency
• vibration
• amplitude

Dan was sitting outside playing his new drum when his dog knocked some sand on it.  Afterwards, each time Dan thumped the drum, he noticed the sand on top of the drum bounced.  Which of the following is the best explanation for why this happened?  

• Sand moves easily on drums.
  
• Dan was thumping the drum too hard.
• Vibrations moved from the drum to the sand.
• Vibrations moved from the sand to the drum.

Tags

NGSS.MS-PS4-2

Sound waves are what kind of wave?

• Longitudinal
• Transverse
• Surface
• Electromagnetic

Tags

NGSS.MS-PS4-1

What happens when you increase the amplitude of a sound?

• it makes the sound louder
• it makes the sound travel faster
• it increases the wavelength of the sound
• it increases the frequency of the sound

Tags

NGSS.MS-PS4-1

What part is #3?

• Pinna

• Ear Canal

• Ear Drum

• Oval Window