1. Which of the following is NOT useful to reduce friction?
A. ball bearing B. rough surface C. oil D. Wheels
2. Why does sandpaper have lots of friction?
A. It can be slippery. B. It has rough surface
C. It can tear very easily D. It has smooth surface
3. Which of the following demonstrate the usefulness of friction?
A. Friction helps the machines to do the work.
B. Friction helps us to walk on the ground.
C. Friction can cause accidents.
D. Friction can cause burnings.
4. What pulls the object to the ground?
A. Speed B. Gravity C. motion D. friction
5. A feather and a pebble released simultaneously from the same height do not reach the ground at the same time. Which of the following is the MOST possible cause?
A. friction B. force of gravity C. air resistance D. force of attraction
6. What causes the motion of car to slow down as it is moving up the slpe of mountain?
A. The gravity of the earth that pulls the car down the slope.
B. The force of the car that increases as it goes up the slope
C. The mass of the car the increases as it moves up a mountain.
D. The frictional force between the road and the wheels of the car that decreases as it moves up a mountain.
7. Which of the following statement is true about mass gravity?
A. The lesser the mass of the object, the lesser the gravity too.
B. The greater the mass of the object, the lesser the pull of gravity
C. The lesser the mass of the object, the greater the pull of gravity
D. The greater the mass of the object, the greater the pull of gravity
8. What is sound? it is a form of energy produced by ____.
A. conduction B. radiation C. convection D. vibration
9. Which of the following activities shows that sound is produced?
A. Reading silently B. tapping the table
C. sitting on a chair D. Standing by the window
10. What energy useful to people?
A. It produces a lot of noise for people to enjoy.
B. It brightens the entire world for people to see.
C. It gives color to the earth for people to appreciate.
D. It helps people in communicating and learning things
11. What energy makes us see everything around us?
A. solar B. light B. electrical D. chemical
12. Some forms of energy have changed into other forms. The changed from one form into another is called ___.
A. Heat energy B. Light energy
C. Sound Energy D. Energy Transformation
13. Why is transformation of energy important?
A. It is useful in playing.
B. It is a waste of energy.
C. It can help people in many ways.
D. It produces bad effect to people.
14. Which of the following simple machine is used to cut hard objects?
A. axe B. knife C. nail cutter D. scissors
15. How do you take good care of a simple machines at home?
A. Use them all the time to avoid getting tarnishing.
B. Keep sharp objects in a place away from children.
C. Place them near to anyone so that they can be seen easily.
D. Allow them to get wet in the rain or running water for faster cleaning