Soal PPG IPA dan Pembahasannya

What tools/materials/media should you use in teaching to achieve the competency of presenting experimental results about energy transformation, including photosynthesis?

• original specimen

• photosynthesis video

• charts and images

• game media on photosynthesis

• interactive multimedia on photosynthesis

Which statements show evidence that the photosynthesis reaction meets the law of conservation of mass?

• the type and number of atoms before and after photosynthesis are the same

• the type of elements, molecules/compounds, or ions before and after photosynthesis are the same

• during the dry season, photosynthesis will not occur because plants do not get enough water

• photosynthesis requires sunlight, so it only occurs during the day

• the number of oxygen molecules produced is the same as the number of carbon dioxide molecules needed

Which statement is true about the energy transformation that occurs during photosynthesis?

• Light energy is converted into chemical energy

• Chemical energy is converted into heat energy

• Kinetic energy is converted into chemical energy

• Mechanical energy is converted into chemical energy

• Chemical energy and heat energy are converted into chemical energy

Which event transforms gravitational potential energy into kinetic energy?

• A mango is thrown upwards

• A stone rolls down a hill

• A ball is kicked and soars

• A coconut on a tree branch

• A bird flaps its wings in the air

When the palms of your hands are rubbed together, what type of energy transformation occurs?

• kinetic to sound

• potential to heat

• kinetic to heat

• potential to heat

• potential to kinetic

A falling object from height h, after t seconds is at height ½ h. At height ½ h, what is true?

• Ek = zero and Ep = maximum

• Ek = maximum and Ep = zero

• Ek is not zero and Ep = zero

• Ek is not zero and Ep is not zero

• Ek = maximum and Ep = maximum

A table tennis ball with a mass of 10 g is pushed off the table surface so that its speed when it leaves the edge of the table is 2 m/s. What is the mechanical energy of the table tennis ball when its height from the ground is 1 m?

• 0.02 J

• 0.10 J

• 0.12 J

• 0.22 J

• 0.24 J

A papaya falls from a height of 5 m above the ground. If the mass of the papaya is 2 kg and g = 10 ms-2, what is the potential energy possessed by the papaya?

• 42 joule

• 64 joule

• 100 joule

• 120 joule

• 150 joule

A ball is thrown vertically upwards. The kinetic energy of the ball will be zero when it is at which position?

• almost near the ground

• reaching the highest point

• moving upwards

• moving downwards

• when thrown

Which of the following is not an alternative energy source?

• bioethanol

• solar energy

• castor seeds

• food

• petroleum