MEDELLIN NATIONAL HIGH SCHOOL
Poblacion, Medellin, Cebu
Diagnostic Test in SCIENCE 8
1st Quarter
Name: __________________________________________ Section: _________________________
I. MULTIPLE CHOICE. Read the questions carefully. Circle the letter of your answer.
1. How long will an object remain at rest, according to Newton's First Law of Motion?
a. It can’t rest
c. Until an unbalanced force occurs
b. Until noon
d. As long as there are unbalanced forces acting on it.
2. Why is it harder to push a van filled with bowling balls than it is to push van filled with basketballs?
a. The mass of the car is greater than the mass of the basketball.
b. The mass of the bowling balls is greater than the mass of the basketballs.
c. The van with the basketballs is bigger than the van with the bowling balls.
d. It should be equally as hard to push the two vans.
For question 3-6 which of Newton’s Three Laws of Motion do the following statements satisfy?
a. Newton’s First Law
c. Newton’s Third Law
b. Newton’s Second
d. All of the above
3. If you have a hockey puck sliding along a table, it will eventually come to a stop.
4. Imagine a ball moving in a straight line directly toward when another ball collides with it. The moving ball
exerts a force on the ball at rest. This causes the ball at rest to accelerate. However, the ball at rest also
exerts the same magnitude of force (in the opposite direction) of the moving ball. This will cause the moving
ball to decelerate or even move in another direction.
5. Which law states the need to wear seatbelts?
6. The blood in your head rushes to your feet when riding an elevator is descending & abruptly stops.
7-9. Refer to the following situations:
I.
Open the valve of a water hose.
II.
Two boys pull on a cart on opposite ends but it does not move.
III.
Give a plastic ball a slight push along a smooth floor. It rolls with uniform speed.
IV.
If you switch off the engine of a moving car, it will continue to move for some time before it finally
comes to stop.
7. Which situation(s) is/are described by Newton’s first law?
a. I only
b. II only
d. IV only
e. II and III
c. III only
f. III and IV
8. Which situation(s) is/are described by Newton’s second law?
a. I only
b. II only
d. IV only
e. II and III
c. III only
f. III and IV
9. Which situation(s) is/are described by Newton’s third law?
a. I only
b. II only
d. IV only
e. II and III
c. III only
f. III and IV
10. Power is defined as the _______ is done.
a. amount of work which
b. direction at which work
c. angle at which work
d. the rate at which work
11. Which of the following is a measure of velocity?
a. 30s
b. 30 South
c. 30 m/s
12. If a person walked at 2 m/s for 12 s he/she would travel a distance of ________.
a. 24 m
b. 6 m
c. 4 m
answers
13. How long would it take to travel 50 km traveling at a speed of 10 km/hr?
a. 3 hours
b. 1 hour
c. 5 hours
14. The SI unit for speed is the ________.
a. in./hour
b. m/s
answers
c. cm/min.
d. 30 m/s, South
d. none of the
d. 50 hours
d. none of the
15. ______________ describes how fast something is going, whereas, __________ describes how fast something
is going and in a certain direction.
a. speed, velocity
b. rate, speed
c. rate, velocity
d. speed,
acceleration
16. The speed of sound depends on the arrangement of the molecules of the medium where it is to be
transmitted. What is the arrangement of the medium molecules so that it will travel faster?
a. A closely packed
b. farther apart
c. randomly align
d. farthest apart
17. Wave consists of vibrations which _____________ energy from one place to another without actually
propagating the particles.
A. reflected
b. transfer
c. refracts
d. vibrates
18. The red wavelengths of light are the _____ wavelengths and the violet wavelengths of light are the _____
wavelengths.
a. Longer, shorter
b. harder, softer
c. deep, shallow
d. light,
heavy
19. Violet light refracts more than red light because_____________.
a. it has higher frequency and lower wavelength
c. it has lower frequency and higher wavelength
b. it has higher frequency and higher wavelength
d. it has lower frequency and lower wavelength
20. In which situation is work done?
A. a weightlifter holding a barbell
C. a vendor carrying a basket of goods
B. a gardener pushing a lawnmower
D. a security guard standing in front of a building
For items 21-25, write KE if kinetic energy is present, PE if potential energy and BOTH if both kinetic energy and
potential energy is present.
21.
22.
23.
24.
25.
A boy pulling his slingshot’s rubber back and getting ready to release his pebble
A rock at the edge of a cliff
Glass of milk
Moving a skateboard
A bowling ball rolling toward bowling pins.
II. MODIFIED TRUE OR FALSE: If the statement is correct, write the word TRUE and if it is false, change the
underlined word or words to make the statement true.
_________________1. Ultrasonic sounds are the loudest sounds that you can hear.
_________________2. The loudness of a sound is synonymous to its pitch.
_________________3. Refraction is the bending of light as it passes through an obstruction such as a small
slit.
_________________4. The human ear can only hear sounds between 20 hertz and 20, 000 hertz.
_________________5. Tyndall scattering is the cause why the sky is blue.
_________________6. The distance that light can travel in a year is called light-year.
_________________7. The energy that is stored in fuel and food is called kinetic energy.
_________________8. Transparent objects reflect or absorb light waves and colors.
_________________9. The unit used for intensity is the hertz.
_________________10. Pitch describes how high or low a sound is.
“Go confidently in the direction of your dreams. Live the life you have imagined.”
PREPARED BY:
JEWEL JUNE E. BOJOS, RN, LPT
Science 8 Teacher