## Physical Quantities, Units and Measurement

## Physical Quantities, Units and Measurement (O Level)

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Question 1 |

A vernier caliper is precise to ___ ?

1mm | |

0.1mm | |

0.01mm | |

0.001mm |

Question 2 |

A micrometer screw gauge is precise to ___ ?

0.1mm | |

0.01mm | |

0.005mm | |

0.05mm |

Question 5 |

0.3 mm | |

0.03 mm | |

-0.3 mm | |

-0.03 mm |

Question 5 Explanation:

The Vernier Caliper is precise to 0.1 mm.
When the error reads a positive number, it is known as a positive error.

Question 6 |

This is the final reading on a vernier caliper with a zero error of -0.3 mm. What is the actual measurement?

9.99 cm | |

9.72 cm | |

10.05 cm | |

10.32 cm |

Question 6 Explanation:

Formula for measurements with zero error: Final reading - Zero error = Actual reading.
Final reading is 10.02 cm or 100.2 mm.
Since Zero error is -0.3 mm,
Final reading = 100.2 mm - (-0.3 mm) = 100.5 mm or 10.05 cm.

Question 7 |

0.3 mm | |

-0.3 mm | |

0.7 mm | |

-0.7 mm |

Question 7 Explanation:

Since the vernier scale is behind the main scale, zero error is negative.
When zero error is negative, you have to read from the back of the vernier scale, getting a zero error of -0.7 mm instead of -0.3 mm.

Question 9 |

0.048 mm | |

0.48 mm | |

-0.2 mm | |

-0.02 mm |

Question 9 Explanation:

The screw has been closed past the 0 cm mark. Hence, the zero error is negative. Since it has gone past the 0 cm mark by 0.02 mm, zero error is -0.02 mm.

Question 11 |

9.48 cm | |

9.48 mm | |

9.98 cm | |

9.98 mm |

Question 11 Explanation:

The 9.50 mm mark has been crossed. You need to add 0.48 mm to 9.50 mm to get the answer 9.98 mm.

Question 12 |

A micrometer with a -0.03 mm zero error is used to get this final reading below. What is the actual measurement?

2.41 mm | |

2.35 mm | |

2.91 mm | |

2.85 mm |

Question 12 Explanation:

Formula for measurements with zero error: Final reading - Zero error = Actual reading.
Final reading is 2.88 mm.
Since Zero error is -0.03 mm,
Final reading = 2.88 - (-0.03 ) = 2.91 mm

Question 13 |

A car travels 8 km southwards, followed by 6 km southwards. What is the magnitude of its distance and displacement?

Distance: 14 km
Displacement: 14 km | |

Distance: 14 km
Displacement: 10 km | |

Distance: 10 km
Displacement: 14 km | |

Distance: 10 km
Displacement: 10 km |

Question 14 |

A car travels 8 km southwards, followed by 6 km northwards. What is the magnitude of its distance and displacement?

Distance: 14 km
Displacement: 14 km | |

Distance: 14 km
Displacement: 10 km | |

Distance: 14 km
Displacement: 2 km | |

Distance: 10 km
Displacement: 14 km |

Question 15 |

A car travels 8 km southwards, followed by 6 km eastwards. What is the magnitude of its distance and displacement?

Distance: 14 km
Displacement: 14 km | |

Distance: 14 km
Displacement: 10 km | |

Distance: 10 km
Displacement: 14 km | |

Distance: 10 km
Displacement: 10 km |

Question 16 |

A car travels 8 km southwards, followed by 6 km eastwards. What is its southward displacement?

14 km | |

10 km | |

8 km | |

2 km |

Question 16 Explanation:

The only direction to consider is south, as the question asks. Travelling East or West do not change the southward displacement. Only travelling North or South do.

Question 17 |

A car travels 8 km to the west, 6 km to the north, 8 km to the east and 6 km to the south. What is its displacement?

0 km | |

6 km | |

14 km | |

28 km |

Question 17 Explanation:

The car starts and ends at the same point. The straight line distance between the start and end point is 0 km.

Question 18 |

The dimensions of a small book is measured as 73.2 mm, 37.2 mm, 2.37 mm. What measuring tool could have been used to obtain these readings?

Measuring tape | |

Micrometer Screw Gauge | |

Vernier Caliper | |

Meter Rule |

Question 18 Explanation:

Only a Vernier Caliper has the precision of 0.1 mm.

Question 19 |

23 m/s = _____ km/h

82.8 | |

1.38 | |

828 | |

\[6.39 \times {10^{ - 6}}\] |

Question 19 Explanation:

23 m/s
= 0.023 km/s
= (0.023 x 60) km/min
= [(0.023 x 60) x 60] km/h
= 82 km/h

Question 20 |

A car travels 8 km southwards, followed by 6 km eastwards. What is the magnitude of its distance and displacement?

Distance: 14 km
Displacement: 14 km | |

Distance: 14 km
Displacement: 10 km | |

Distance: 10 km
Displacement: 14 km | |

Distance: 10 km
Displacement: 10 km |

Question 21 |

Which of the following is equivalent to the units of force?

$kgm{s^{ - 1}}$ | |

$kgm{s^{ - 2}}$ | |

$kgm{s^2}$ | |

$kgms$ |

Question 21 Explanation:

$\begin{array}{l}
F = ma\\
N = kg(m{s^{ - 2}})
\end{array}$

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