PPE Revision quiz part one

If the total amount of energy is 5000J, the wasted energy is 3000J. What is value of efficiency?

• 0.6

• 1.67

• 0.4

• 2.5

If the total amount of energy is 5000J, the wasted energy is 3000J. What is useful energy?

• 3000J

• 5000J

• 8000J

• 2000J

Conservation of energy tells us the total energy in a closed system is...

• changing all the times

• constant

• increased

• decreased

This is a wave. Please label the number of y.

(a)  

This is a ...

• transverse wave

• longitudinal wave

This is a ...

• transverse wave

• longitudinal wave

Which one is longitudinal wave?

• water wave

• sound wave

• The wave along the guitar string.

• light

If the frequency of a sound wave is 200Hz and the wavelength of this wave is 1.5 m, what is the value of wave speed?

(a)  

Please select the correct name for label a and label b.

• a is red

  b is violet

• b is violet

  a is red

Fill the name of labels a and b.

• a is smaller.

  b is higher

• a is longer

  b is lower

• a is smaller

  b is lower

• a is longer

  b is higher.