Directions: Choose the best answer for each and write CAPITAL LETTER of your answer in your paper.
1. The process of separating white light into bands of colors using a prism is known as ___.
A.Refraction
B. dispersion C. reflection
D. diffraction
2. When light passes through a prism, why does violet bend the most while red bend the least?
A.because violet and red have the same wavelength
B.because violet and red have the shortest wavelength
C. because violet has the longest wavelength and red has the shortest
D. because violet has the shortest and red has the shortest longest
3. What color of light has the most energy?
A. red
B. blue
C. violet
D. orange
4. What color of light has the longest wavelength?
A. red
B. violet
C. orange
D. blue
5. What is the quantity that tells how hot or cold an object is with respect to some standard?
A. mass
B. heat
C. pressure
D. temperature
6. When the temperature of an object increases, the average kinetic energy of the molecules __.
A. increases
B. decreases
C. remains the same
D. becomes colder
7. What causes an ice to melt?
A. the change in weather
B. the presence of hot water
C. the absorption of the heat from its surrounding
D. the release of heat to the cooler surrounding
8. Which of the following is transfer of (thermal) energy between object or places due to temperature differences?
A Heat
B. Kinetic
C. Temperature
D. Internal
9. What happens to the current as the voltage increases
A. Current decreases as the voltage increases
B. Current increases as the voltage increases
C. Current remains the same as the voltage increases
D. Both A & B
10. What is the relationship between current, voltage and resistance in a circuit?
A. The current is directly proportional to the voltage and inversely proportional to the
resistance of the circuit
B. The current is inversely proportional to the voltage and directly proportional to the
resistance of the circuit
C. The current is directly proportional to the voltage and resistance of the circuit
D. The current is inversely proportional to the voltage and resistance of the circuit
11. What will be the current through the resistance of 150 Ω if the applied voltage across the resistance is 117V?
A. 780 A
B. 78.0 A
C. 0.780 A
D. 7.80 A
12. A voltmeter connected across a resistance reads 220 V. An ammeter connected in series with the resistance reads 2.60 A. What is the value of the resistance?
A. 846 Ω
B. 8046 Ω
C. 84.6 Ω
D. 8.46 Ω
13. Which of these statements DOES NOT describe series connection?
A. There is several path through which electron can flow.
B. If one bulb is busted the remaining bulb will not work.
C. The total current is the same as the current in individual loads.
D. the total voltage is equal to the sum of the voltage drops across each load.
14. Referring to the diagram on the left, what will happen to lamps A and B if lamp C burns out?
A. Bulb B burns out but Bulb A does not.
B. Bulbs A and B are not affected and still light up.
C. Bulbs A and B also burn out so they do not light up.
D. Bulbs A and B do not burn out but they do not light up.
15. What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added?
A. increases
B. decreases
C. remains the same
D. cannot be predicted
16. Two bulbs are connected and plugged to the outlet as shown in the figure. Both bulbs have the same..
A. current
B. voltage
C. resistance
D. voltage and current
17. Why is it necessary to use circuit breakers?
A. to prevent overloading
C. to ensure safety connection
B. to protect against excessive resistance
D. to prevent user contact with dangerous voltage
18. Why is earthing or grounding important?
A. to protect people from electric flow
B. to protect the equipment from excessive curre
C. to protect buildings from earthquakent
D. to protect electrical devices against excessive voltage
19. Which of the following activities DOES NOT ensure safe use of electricity?
A. replacing old wirings
B. plugging too many appliances to an outlet
C. purchasing appliances with double insulation
D. connecting the ground wire of a washing machine to the ground.
20. Which of the following is the purpose of double insulation?
A. to protect people from electric flow
B. to protect buildings from earthquake
C. to protect the equipment from excessive current
D. to protect the user from electrical shock by preventing external casing to become
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