NEW
Font size
WorksheetsCh 8 Making Use of Electricity Exercise 3
Total questions: 17
Worksheet time: 34mins
Which of the following are insulators?
(1) Chalk
(2) Pencil lead
(3) Rubber tubing
(4) Aluminium foil
(1) and (3) only
(1) and (4) only
(1), (2) and (3) only
(1), (2), (3) and (4)
Free electrons of a metal
collide with each other.
move around the nuclei of atoms.
do not carry charges.
move freely within the metal.
Which of the following statements about the current in a closed circuit is correct?
Free electrons flow from the positive pole of the electric cell towards the negative pole.
Free electrons flow from the negative pole of the electric cell towards the positive pole.
Atoms flow from the positive pole of the electric cell towards the negative pole.
Atoms flow from the negative pole of the electric cell towards the positive pole.
Which of the following statements about ammeter is/are correct?
(1) The larger the reading, the larger the electric current.
(2) Negative terminal should be connected to negative poles of electric cells.
(3) It measures the amount of energy supplied to the free electrons by the cell.
(1) only
(2) only
(1) and (2) only
(1), (2) and (3)
Which of the following instruments is used to measure current?
A
B
C
D
Which of the following does NOT make use of the heating effect of electric current?
television
toaster
kettle
heater
If we want to measure the voltage across the resistor, how should we connect the voltmeter?
(1) only
(2) only
(1) and (3) only
(2) and (3) only
The two voltmeters in the circuit below are identical. The voltage of the electric cell is 1.5 V. Which of the following statements about the circuit is correct?
If voltmeter Q is disconnected, the reading of voltmeter P will become zero.
The reading of voltmeter P is larger than the reading of voltmeter Q.
The reading of voltmeter P is smaller than the reading of voltmeter Q.
Voltmeters P and Q show the same readings.
Thomas designs a circuit as shown. Suppose the two light bulbs are identical and they are in series circuit with nichrome wire I and nichrome wire II respectively. In which of the following conditions will light bulb 1 be brighter than light bulb 2?
(1) Nichrome wire I is longer than nichrome wire 2.
(2) Nichrome wire I is thicker than nichrome wire 2.
(3) Nichrome wire I is replaced by a copper wire.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
The following diagram shows a sliding rheostat connected to two electric cells and a light bulb. At which position of the sliding contact is the resistance of the sliding rheostat the greatest?
A
B
C
D
Which of the following statements about a series circuit connected to different light bulbs must be correct?
(1) Currents flowing through different light bulbs in the circuit are the same.
(2) Voltages across different light bulbs in the circuit are the same.
(3) The brightness of different light bulbs is the same.
(1) only
(2) only
(1) and (2) only
(1), (2) and (3)
Six identical light bulbs are connected in the circuit as shown.
Arrange the light bulbs in descending order of the brightness.
Z > X, Y > P, Q, R
P > Q, X > R, Y, Z
P, X, Z > Q, Y > R
R, Y, Z > Q, X > P
Which of the following statements about a live wire is correct?
The colour of a live wire is blue.
A live wire carries the voltage.
An electrical appliance without a live wire can still function normally.
A live wire provides a return path for the electric current.
In which of the following cases will the current stop flowing in a circuit?
(1) The rheostat is at its maximum resistance.
(2) The fuse melts and breaks.
(3) The switch is opened.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
What is the function of the following device?
Its resistance can be adjusted so as to control the current that flows through an electrical appliance.
It is a device to save energy.
It is used to open or close a circuit.
It is a safety device that breaks the circuit when the current is too large.
Which of the following is an improper action of using electricity?
Turn on the electric heater in bathroom when bathing.
Replace damage wires with new wires.
Touch switches with dry hands.
Use a fuse with a fuse rating slightly higher than the current in the circuit.
Which of the following combinations is INCORRECR?
Physical quantity: Electric current
Unit: Ampere (A) :
Physical quantity: Electrical energy
Unit: Watt (W) :
Physical quantity: Voltage
Unit: Volt (V) :
Physical quantity: Resistance
Unit: Ohm (W) :
