Measurements and Units Practice Questions
WAEC (West Africa) · WAEC Physics · 134 free MCQs with instant results and detailed explanations.
134
Total
39
Easy
74
Medium
21
Hard
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Sample Questions from Measurements and Units
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Q1
Easy
If 1 meter is equivalent to 100 centimeters, how many centimeters are in 5 meters?
A.
300 cm
B.
400 cm
C.
500 cm
D.
600 cm
Show Answer & Explanation
Correct Answer: C
To convert meters to centimeters, you multiply by 100. Therefore, 5 meters equals 5 x 100 = 500 centimeters.
Q2
Easy
Which of the following is a derived unit in the SI system?
A.
Kilogram
B.
Meter
C.
Liter
D.
Newton
Show Answer & Explanation
Correct Answer: D
The Newton is a derived unit as it is defined in terms of base units: 1 Newton is equal to 1 kgยทm/sยฒ, combining mass and acceleration.
Q3
Easy
Which of the following is the SI unit of length?
A.
Meter
B.
Centimeter
C.
Kilometer
D.
Millimeter
Show Answer & Explanation
Correct Answer: A
The SI unit of length is the meter, which is the standard unit used in scientific measurements. The other options are derived units based on the meter.
Q4
Medium
A rectangular block of wood has dimensions 10 cm, 5 cm, and 2 cm. What is the volume of the block in cubic centimeters?
A.
100 cmยณ
B.
90 cmยณ
C.
80 cmยณ
D.
70 cmยณ
Show Answer & Explanation
Correct Answer: A
Volume is calculated by multiplying the length, width, and height. Here, 10 cm ร 5 cm ร 2 cm = 100 cmยณ.
Q5
Medium
Which of the following represents the correct SI unit for measuring pressure?
A.
Pascal (Pa)
B.
Newton (N)
C.
Joule (J)
D.
Watt (W)
Show Answer & Explanation
Correct Answer: A
Pressure is defined as force per unit area, and the SI unit for pressure is the Pascal (Pa), which is equivalent to one Newton per square meter.
Q6
Medium
What is the appropriate instrument for measuring liquid volume in the laboratory?
A.
Thermometer
B.
Graduated cylinder
C.
Barometer
D.
Calorimeter
Show Answer & Explanation
Correct Answer: B
A graduated cylinder is specifically designed to accurately measure the volume of liquids using markings for precise readings.
Q7
Medium
What is the SI unit for measuring electric current?
A.
Volt
B.
Ohm
C.
Ampere
D.
Watt
Show Answer & Explanation
Correct Answer: C
The Ampere is the SI unit that measures electric current, defined as one coulomb per second. It is a fundamental unit in the International System of Units (SI).
Q8
Hard
A cylindrical metal rod has a length of 2.0 m and a diameter of 0.05 m. If the rod is heated, its length increases by 0.004 m. What is the linear expansion coefficient of the metal?
A.
2.0 x 10^-5 /ยฐC
B.
1.0 x 10^-4 /ยฐC
C.
3.0 x 10^-5 /ยฐC
D.
4.0 x 10^-5 /ยฐC
Show Answer & Explanation
Correct Answer: B
The linear expansion coefficient (ฮฑ) is calculated using the formula: ฮฑ = ฮL / (L0 * ฮT). Here, ฮL = 0.004 m, L0 = 2.0 m. Assuming a temperature change (ฮT) of 100ยฐC, ฮฑ = 0.004 / (2.0 * 100) = 1.0 x 10^-4 /ยฐC.
Q9
Hard
If a car travels at a speed of 72 km/h, how far will it travel in 2 hours? Convert your final answer into meters.
A.
4000 m
B.
5000 m
C.
6000 m
D.
8000 m
Show Answer & Explanation
Correct Answer: D
To find the distance traveled, use the formula: Distance = Speed ร Time. First, convert 72 km/h to m/s: 72 km/h = 72 * (1000 m / 3600 s) = 20 m/s. Now, Distance = 20 m/s * 7200 s = 8000 m.
Q10
Hard
A cylindrical container has a radius of 5 cm and a height of 10 cm. What is the volume of the container in cubic centimeters? (Use ฯ = 3.14)
A.
250 cmยณ
B.
300 cmยณ
C.
314 cmยณ
D.
785 cmยณ
Show Answer & Explanation
Correct Answer: D
The volume of a cylinder is given by the formula V = ฯrยฒh. Substituting r = 5 cm and h = 10 cm, V = 3.14 * (5ยฒ) * 10 = 785 cmยณ, making option D the correct answer.
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Measurements and Units โ WAEC (West Africa) WAEC Physics Practice Questions Online
This page contains 134 practice MCQs for the chapter Measurements and Units in WAEC (West Africa) WAEC Physics. The questions are organized by difficulty โ 39 easy, 74 medium, 21 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.