Electrical Energy Past Questions: Integrated Science WASSCE Questions by Topic

Integrated Science WASSCE Past Questions: ELECTRICAL ENERGY Objective Questions (2016-2019)

These are electrical energy past questions. These past questions would enable candidates to practice questions specifically on electrical energy after studying the topic.

I) Questions that occur multiple times means they were repeated over the period under consideration

II) Candidates are expected to spend 50 seconds on each objective question. Candidates are therefore required to spend between 8-9minutes on these 10 questions. Start work now!!

1. Which of the following measures are taken to conserve energy
I. Switching off electrical appliances when not in use
II. Closing all windows and doors when using an air conditioner
III. Ironing cloths in bulk
IV. Allowing hot food to cool before putting it in the refrigerator
A. I and II only
B. III and IV only
C. I, II and III only
D. I, II, III and IV

2. Which of the following statements about a step-down transformer is/are correct? It has
I. More turns in the secondary coil than in the primary coil
II. Less coil in the secondary coil than in the primary coil
III. Higher voltage in the primary coil than in the secondary coil
A. I only
B. II only
C. I and III only
D. II and III only

3. The S.I unit for potential difference is
A. Ampere
B. Ohms
C. Volts
D. Watts

4. An electrical bulb is rated 20W. This means that when it is in use, the
A. energy required to light it during outage is 20J
B. amount of energy consumed every second is 20J
C. work done in a day is 20J
D. amount of energy consumed every hour is 20J

An electrical kettle rated 2kW is operated by 240V mains for 20 minutes.
Use this information to answer questions 5 and 6.

5. Determine the current drawn from the mains
A. 0.1A
B. 1.2A
C. 4.2A
D. 8.3A

6. Calculate the resistance of the elements of the kettle
A. 8ohms
B. 29ohms
C. 240ohms
D. 248ohms

7. An electrical circuit consist of a 2V cell connected to a 5ohms resistor. Determine the amount of current through the resistor when the circuit is closed.
A. 0.4A
B. 1.0A
C. 2.5A
D. 4.0A

8. The power rating of an electric machine is 100W. This machine
A. can do 100J of work in 1 minute
B. uses electric energy of 100J in 1 hour
C. uses electric energy of 100J in 1 second
D. can get heated after working for 100 seconds

9. The purpose of earthling in an electric circuit is to
A. Regulate the voltage
B. Protect the appliances
C. Protect the human being
D. Stabilize the current

10. The following materials are conductors of electricity except
A. Blood
B. Copper
C. Mica
D. Water

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Answers
1. D
2. D
3. C
4. B
5. D

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6. B
7. A
8. C
9. C
10. C

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