Hydroelectric energy is generated from .........
waterfalls and dams
biofuel and fossil fuel
All the following are found deeply under earth's surface except ......
green plant
coal
When objects crash with each other, then .......transfers between them.
energy
Distance
Coal is a type of fuel, which is used in all the following purposes except ...........
operating TV
warming houses
Kinetic energy doesn't affect by the ..........
Mass
color
The big truck needs .... Engine.
small
Big
Curiosity rover is designed to explore .........
Mars planet
The Moon
To keep playing with the toy car, we have to .............. the batteries.
heat
replace
When the car stops suddenly, the passengers move .........
backward
Forward
When a piece of coal is burnt, .......... Energy is produced.
Potential
thermal
When you turn on a light bulb, the electrical energy travels through .......... until reaching the bulb.
plastic
wires
In a battery of a toy car ........... energy changes into electrical energy.
chemical
sound
Both hair dryer and electric water kettle produce ...........energy.
light
When you use the hand ball, the ....energy changed into sound energy.
kinetic
electrical
Electric wires are made of .............
wood
copper
.......... is considered as the main resource of energy on Earth's surface.
Natural gas
The sun
The car needs ........... to move.
fuel
water
The produced ...... energy doesn't help the blender do its job.
When the car fuel completely runs out, then the car's ...... becomes zero.
speed