Monthly quiz, october 2023, G7

The summation of kinetic energy and potential energy is ..................................

• Electric energy

• Magnetic energy

• Dynamic energy

• Mechnical energy

In the opposite figure, If the mechanical energy of the ball of 0.250 kg weight is 5J

Calculate the height of the girl from the ground.

• 5 m

• 10 m

• 15 m

• 20 m

If you increased the object speed to double, and decreased its mass to the half

Its kinetic energy ....................................

• Remains constant

• Doubled

• Uncreases 4 times

• Decreased to half

A 5 kg mass object was falled vertically from height 7 m

So, its kinetic energy at height of 3 m is ............................ Joule.

• 15

• 20

• 25

• 30

The kinetic energy is inversly proportion with ....................................

• Potential energy

• Mechanical energy

• The speed

• No correct answer

The mechnical energy changed into electric energy in ........................................

• Motor

• Electric fan

• Television

• Dynamo

When a moving pendolium passes at its rest position, its .................................. energy is the minimum

• Moving

• Potential

• Kinetic

• Speed

Plants can produce their food by photosynthesis process which converts the solar energy into ............................. stored in glucose.

• Kinetic energy

• Electric energy

• Thermal energy

• Chemical energy

In the simple electric cell, the (+ve) pole is .....................

• Zinc

• Copper

• Plastic

• Glass

The chemical energy stored in the fuel, chenges into ................................... energy in the car engine.

• Mechnical

• Potential

• Thermal (heat)

• Electric