Measurements and Units Practice Questions
NECO (Nigeria) · NECO Physics · 131 free MCQs with instant results and detailed explanations.
131
Total
35
Easy
72
Medium
24
Hard
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Sample Questions from Measurements and Units
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Q1
Easy
Which of the following is a derived unit in physics?
A.
Newton
B.
Meter
C.
Second
D.
Kilogram
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Correct Answer: A
A Newton is a derived unit of force, which is defined as the force required to accelerate a 1-kilogram mass by 1 meter per second squared.
Q2
Easy
If a measurement is said to have an uncertainty of ยฑ0.5 cm, what does this imply?
A.
The true measurement is between the measured value minus 0.5 cm and the measured value plus 0.5 cm.
B.
The measurement is exactly 0.5 cm.
C.
The measurement is guaranteed to be accurate only to 0.5 cm.
D.
The uncertainty will decrease with more measurements.
Show Answer & Explanation
Correct Answer: A
An uncertainty of ยฑ0.5 cm indicates that the true value lies within a range of the measured value, specifically from the measured value minus 0.5 cm to plus 0.5 cm.
Q3
Easy
If a ruler measures 15 cm, how many meters is this equivalent to?
A.
0.15 m
B.
1.5 m
C.
15 m
D.
0.0015 m
Show Answer & Explanation
Correct Answer: A
To convert centimeters to meters, divide by 100. Therefore, 15 cm is equal to 15/100 = 0.15 m.
Q4
Medium
A student measures the length of a table and finds it to be 1.5 meters. If he wishes to convert this length into centimeters, what will be the correct measurement?
A.
150 cm
B.
15 cm
C.
1.5 cm
D.
0.15 cm
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Correct Answer: A
To convert meters to centimeters, multiply the length in meters by 100, since 1 meter is equal to 100 centimeters. Therefore, 1.5 meters ร 100 = 150 centimeters.
Q5
Medium
If the mass of an object is 2000 grams, what is its mass in kilograms?
A.
2 kg
B.
20 kg
C.
200 kg
D.
0.2 kg
Show Answer & Explanation
Correct Answer: A
To convert grams to kilograms, divide the mass in grams by 1000, as 1 kg equals 1000 grams. Therefore, 2000 grams รท 1000 = 2 kilograms.
Q6
Medium
Which of the following tools is best used for measuring liquid volume accurately?
A.
Ruler
B.
Graduated cylinder
C.
Balance scale
D.
Thermometer
Show Answer & Explanation
Correct Answer: B
A graduated cylinder is specifically designed to measure the volume of liquids accurately, as it has marked measurements along its length.
Q7
Medium
What is the SI unit of measure for temperature?
A.
Celsius
B.
Fahrenheit
C.
Kelvin
D.
Joule
Show Answer & Explanation
Correct Answer: C
The SI unit for measuring temperature is Kelvin. While Celsius is commonly used, Kelvin is the standard unit in scientific contexts.
Q8
Hard
A scientist measures the length of a metal rod and records it as 1.25 m. If the uncertainty in the measurement is ยฑ0.02 m, what is the percentage uncertainty in the measurement?
A.
1.6%
B.
2.4%
C.
0.04%
D.
0.16%
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Correct Answer: A
Percentage uncertainty is calculated as (absolute uncertainty / measured value) ร 100%. Here, it is (0.02 m / 1.25 m) ร 100% = 1.6%.
Q9
Hard
A metal rod expands by 0.5 cm when heated from 20ยฐC to 80ยฐC. If the initial length of the rod is 2 m, what is the coefficient of linear expansion of the metal?
A.
1.25 x 10^-5 /ยฐC
B.
2.5 x 10^-5 /ยฐC
C.
5.0 x 10^-5 /ยฐC
D.
7.5 x 10^-5 /ยฐC
Show Answer & Explanation
Correct Answer: B
The coefficient of linear expansion is calculated using the formula ฮฑ = ฮL / (L0 * ฮT). Here, ฮL = 0.5 cm = 0.005 m, L0 = 2 m, and ฮT = 80ยฐC - 20ยฐC = 60ยฐC. Thus, ฮฑ = 0.005 / (2 * 60) = 2.5 x 10^-5 /ยฐC.
Q10
Hard
A cylinder has a height of 10 cm and a radius of 3 cm. Calculate its volume in cubic centimeters. Which of the following is the correct calculation for the volume?
A.
90ฯ cmยณ
B.
30ฯ cmยณ
C.
100ฯ cmยณ
D.
60ฯ cmยณ
Show Answer & Explanation
Correct Answer: A
The volume V of a cylinder is calculated using the formula V = ฯrยฒh. Here, r = 3 cm and h = 10 cm, so V = ฯ(3ยฒ)(10) = 90ฯ cmยณ.
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Measurements and Units โ NECO (Nigeria) NECO Physics Practice Questions Online
This page contains 131 practice MCQs for the chapter Measurements and Units in NECO (Nigeria) NECO Physics. The questions are organized by difficulty โ 35 easy, 72 medium, 24 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.