NYGH Lower Sec Science Multiple Choice Questions on Electricity Answers

1 Sc!ence Name: …………………… ( ) Class: ……………… Date: …… / …… / …… Multiple-Choice Questions on Electricity – Answers 1. A student measures the potential difference across a device and the current in the device. Which calculation gives the resistance of the device? A current + potential difference B current  potential difference C potential difference  current D potential difference  current 2. The diagram shows three ammeters. Which ammeters show the same value of current? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 3. The diagram shows part of an electric circuit. What is the reading on the ammeter? A 6.0 A B 3.0 A C 1.5 A D 0.75 A

2 4. Two identical resistors are connected to a 15 V cell as shown in the circuit below. Which of the following correctly describes the readings on the ammeters A1 and A2 when switch K is closed? A A2 has the same reading as A1. B A2 has half the reading as A1. C A2 has double the reading of A1. D A1 has a zero reading while A2 has a non-zero reading. 5. The following diagrams show two lamps, a switch and a battery connected in a circuit. Which one of the circuits is not equivalent to the other three circuits? Answer = C A B C D

3 6. A voltmeter and an ammeter are used to measure the resistance of a resistor. Which diagram shows the voltmeter and the ammeter correctly connected? Answer = B 7. The diagram shows three identical resistors, three ammeters and a battery, connected in a circuit. What is the order of the magnitudes of the readings on the ammeters from smallest to largest? A ammeter 1 < ammeter 2 < ammeter 3 B ammeter 1 < ammeter 3 < ammeter 2 C ammeter 2 < ammeter 3 < ammeter 1 D ammeter 3 < ammeter 2 < ammeter 1 8. A lamp is connected across one cell, then across two cells. The potential difference (p.d.) across the lamp and the current in it are measured in each case. The results are shown. number of cells p.d. / V current / A 1 2.8 0.25 2 5.4 0.4 What is the change in the resistance of the lamp when the number of cells is increased from one to two? A It decreases by 0.015 . B It increases by 1.5 . C It increases by 2.3 . D It increases by 17 .

4 9. The diagram shows a cell connected to three resistors, R1, R2 and R3. A student connects an ammeter first in position 1, then in position 2, 3 and 4 in turn. In which position(s) does the ammeter show the current in R1? A 1, 2 and 4 B 1 and 2 only C 3 only D 4 only 10. A student sets up a circuit which she calls circuit 1. She records the value of the current I1, and calculates the resistance R1 of the circuit. She then connects an identical resistor in parallel with the original resistor. She calls this circuit 2. She records current I2 and calculates the total resistance R2 of this circuit. Which row correctly compares the two currents and the two resistances in the circuits? A I2 is gr