Read and answer the following question. Encircle the correct answer.
1. Which of the following has a slanting or sloping surface?
a. screw
(b.) wedge
c. pulleyd, inclined plane
2. Which of the following simple machine is a wedge?
a. hammer
b. needle C. crowbar
d. seesaw
3. Mother used a spoon to open a can of biscuit. How was the spoon used?
a. as a screw b. as a lever
c. as an inclined plane
d. as a w!
4. A ship will unload big crates at the pier. Which of these machine will the men use?
a. lever b. wheel and axle c. fixed pulley
d. block and tackle
5. Which of these is an inclined plane?
a. hammer b. fishing rod
C, slide
d. wheelbarrow
6. What form of energy does the food provide the human body?
a, mechanical b. electrical
c. chemical d. nuclear
7. What form of energy is produced when the strings of a guitar are plucked?
a. mechanical
b. radiant c, electrical d. sound
B. Why do bits of paper adhere to a comb that was rubbed with a flannel board? Becau
a. comb after rubbing acquires a charge b. comb has a chemical energy
c. bits of paper are sticky
d. bits of paper are lighter than the
What form of energy does a running motor produce?
a. chemical
b. electrical
c. mechanical
0. Why can the sun give off tremendous amount of solar energy? Because
a. it contains millions of non-living, unreacting atoms
b. energy is release when the sun's atoms combine/split
c. nuclear energy is locked up when atoms split
d. rays of the sun continue to glow
1. How is chemical energy stored in food used by the human body. It is used
a. for growth
b. for fattening
c. for growth and development
d. for increasing body weight onl
. When you open a warm bottle of carbonated drink, you'll notice that there are bul
des the formation of these bubbles indicates?
a. some form of energy has been formed b. some form of energy has bee
c. some form of energy has been released d. some form of energy has bee
Chemical energy in matter becomes useful when
a. it is changed to other forms of energy b. it is produced
c. it is always indicated by bubbles
d. it is lost
Which device uses chemical energy in portable radios to produce sound?​