Physical World and Measurement Practice Questions
HSC/SSC (Bangladesh) · HSC Physics · 145 free MCQs with instant results and detailed explanations.
145
Total
40
Easy
82
Medium
23
Hard
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Sample Questions from Physical World and Measurement
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
If a measurement is accurate but not precise, what does it imply?
A.
The measurement is close to the true value.
B.
The measurements are all very close to each other.
C.
There is a systematic error present.
D.
The measurement is consistently wrong.
Show Answer & Explanation
Correct Answer: A
Accuracy refers to how close a measured value is to the actual (true) value. Being accurate but not precise means the measurement is close to the true value, but the values may vary widely.
Q2
Easy
A ruler shows a length of 15.75 cm. What is this measurement in meters?
A.
0.1575 m
B.
1.575 m
C.
0.01575 m
D.
0.175 m
Show Answer & Explanation
Correct Answer: A
To convert centimeters to meters, divide by 100. Thus, 15.75 cm equals 15.75 / 100 = 0.1575 m.
Q3
Easy
Which of the following is a fundamental quantity in physics?
A.
Length
B.
Area
C.
Volume
D.
Density
Show Answer & Explanation
Correct Answer: A
Length is a fundamental quantity as it is one of the basic dimensions used to measure physical phenomena. Area, volume, and density are derived quantities.
Q4
Medium
What is the SI unit of measurement for the intensity of sound?
A.
Decibel
B.
Watt
C.
Joule
D.
Pascal
Show Answer & Explanation
Correct Answer: A
Decibel is the correct unit for measuring sound intensity, as it quantifies sound levels in a logarithmic scale. Other options do not specifically measure sound intensity.
Q5
Medium
Which of the following represents the absolute zero temperature?
A.
-273.15 ยฐC
B.
0 ยฐC
C.
0 K
D.
100 ยฐC
Show Answer & Explanation
Correct Answer: A
Absolute zero is defined as 0 Kelvin, which is equivalent to -273.15 ยฐC. This is the lowest possible temperature where molecular motion ceases.
Q6
Medium
What quantity is defined as the rate of change of momentum?
A.
Force
B.
Work
C.
Energy
D.
Power
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Correct Answer: A
Force is defined as the rate of change of momentum according to Newton's second law (F = dp/dt). The other options do not relate to momentum directly.
Q7
Medium
Which of the following is the correct relationship for converting between meters and centimeters?
A.
1 meter = 100 centimeters
B.
1 meter = 10 centimeters
C.
1 meter = 1000 centimeters
D.
1 meter = 0.1 centimeters
Show Answer & Explanation
Correct Answer: A
The correct conversion factor is that 1 meter equals 100 centimeters, establishing a fundamental metric relationship.
Q8
Hard
A measuring instrument is calibrated such that it shows a reading of 100 cm when the actual length is 98 cm. What is the percentage error in the measurement?
A.
2.04%
B.
1.96%
C.
2.00%
D.
1.98%
Show Answer & Explanation
Correct Answer: A
The percentage error is calculated as (Measured Value - True Value) / True Value * 100. Here, (100 cm - 98 cm) / 98 cm * 100 = 2.04%. Thus, option A is correct.
Q9
Hard
In a specific experiment, a physicist uses a ruler that has a least count of 0.1 cm. If the length of an object is recorded as 12.7 cm, what can be inferred about the precision of the measurement?
A.
The measurement is accurate to the nearest 0.1 cm.
B.
The measurement can be trusted beyond 0.1 cm accuracy.
C.
The measurement is only accurate to the nearest cm.
D.
The precision cannot be determined without more data.
Show Answer & Explanation
Correct Answer: A
The least count of 0.1 cm indicates that the measurement is precise to that value. Therefore, the answer is A because it reflects the correct precision of the measurement.
Q10
Hard
In an experiment, the time period of a pendulum is found to change with the length of the pendulum according to the formula T = 2ฯโ(L/g). If T is measured as 2 seconds and g is taken as 9.8 m/sยฒ, what is the length of the pendulum?
A.
1.01 m
B.
0.81 m
C.
0.64 m
D.
0.45 m
Show Answer & Explanation
Correct Answer: B
Using the formula T = 2ฯโ(L/g), rearranging gives L = (Tยฒg)/(4ฯยฒ). Plugging in T = 2 seconds and g = 9.8 m/sยฒ, we find L = (2ยฒ ร 9.8)/(4ฯยฒ) = 0.81 m.
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Physical World and Measurement โ HSC/SSC (Bangladesh) HSC Physics Practice Questions Online
This page contains 145 practice MCQs for the chapter Physical World and Measurement in HSC/SSC (Bangladesh) HSC Physics. The questions are organized by difficulty โ 40 easy, 82 medium, 23 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.