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Physics for IGCSE & O level - Measurements And Units (Section 3)

1
What does the prefix 'kilo-' represent?
Answer
(B)
1000
2
Which of the following is a correct unit for density?
Answer
A
B
3
Which of the following can be used to measure time?
Answer
B
C
4
Which of the following does a beam balance primarily compare?
Answer
(B)
Weight
5
Which of the following best describes the relationship between the density of a substance and whether it floats or sinks?
Answer
(C)
If less dense, it floats.
6
Which of the following is correct about the force of gravity on the Moon compared to Earth?
Answer
(A)
It is about one-sixth of its value on Earth.
7
What is the average density of Jupiter?
Answer
(A)
1300 kg/m³
8
What is a nanosecond?
Answer
(C)
10⁻⁹ second
9
How many centimeters are in 1 meter?
Answer
(B)
100
10
What is speed?
Answer
(A)
distance / time
11
In the experiment with the crown, what does the water displacement method help determine?
Answer
(B)
The volume of the crown.
12
What is the formula for density?
Answer
(A)
mass / volume
13
What does the density of a substance determine?
Answer
(A)
Whether it will sink or float.
14
What does a reading of 1.05 on a hydrometer indicate?
Answer
(B)
The density of the liquid is 1050 kg/m³
15
If a material is less dense than a liquid, what will happen?
Answer
(B)
It will float.
16
In the context of the text, what does the average density of a planet tell us?
Answer
(C)
The planet's internal structure.
17
What is the formula for calculating the volume of a cylinder?
Answer
(B)
πr²h
18
What is needed to calculate the density of an object?
Answer
(C)
Mass and Volume
19
If you want to measure the volume of a small, irregularly shaped solid, what method would you use?
Answer
(C)
Use the displacement method with water.
20
What is a common example of a derived unit?
Answer
(C)
Square meter (m²)
21
What is the formula for speed?
Answer
(A)
distance/time
22
What units would be used to express the density of a substance?
Answer
(A)
kg/m³
23
What units of measure are typically used for volume?
Answer
A
B
C
24
What is the name of the system of units used by scientists worldwide?
Answer
(C)
SI units
25
If a liquid has a density of 1.05, what is its density in kg/m³?
Answer
(B)
1050 kg/m³
26
What is the primary unit of length in the SI system?
Answer
(B)
Meter
27
What does the SI base unit for temperature measure?
Answer
(C)
Kelvin
28
What is the role of significant figures in a measurement?
Answer
(B)
To indicate the precision of the measurement.
29
Which of the following is a base unit?
Answer
(C)
Time
30
What can cause a hot air balloon to rise upwards?
Answer
(D)
The air inside being hotter than the air outside.
31
Which two quantities are used to determine the volume of an object?
Answer
(B)
Length, width, and height
32
If a solid has a mass of 100g and a volume of 50 cm³, what is its density?
Answer
(B)
2 g/cm³
33
Which of the following is a unit of force?
Answer
(B)
Newton
34
Which of these instruments would be used to measure the temperature?
Answer
(B)
Thermometer
35
Which is the most appropriate SI unit to express the length of a book?
Answer
(B)
Meter
36
What does the prefix 'mega-' represent?
Answer
(B)
1,000,000
37
Which instruments can measure time intervals?
Answer
A
C
38
What does the prefix 'nano-' represent?
Answer
(C)
10^-9
39
What do significant figures indicate?
Answer
A
C
40
Which of these is NOT a base unit in the SI system?
Answer
(D)
Liter
41
What is the formula for calculating average speed?
Answer
(A)
Distance/Time
42
What is the volume of a rectangular box with a length of 5 cm, a width of 2 cm, and a height of 3 cm?
Answer
(C)
30 cm³
43
What instrument is used to find the density of a liquid?
Answer
(B)
Hydrometer
44
If an object's density is less than the density of a liquid, what will happen?
Answer
(B)
The object will float.
45
Which measurement is considered the base unit of time in the SI system?
Answer
(C)
Second
46
Which is an example of a unit of density?
Answer
(A)
g/cm³
47
If an object has a density of 2 g/cm³ and a volume of 10 cm³, what is its mass?
Answer
(C)
20 g
48
What is the relationship between mass, density, and volume?
Answer
(A)
Mass = Density x Volume
49
What does the prefix 'micro-' represent?
Answer
(D)
0.000001
50
How many base units are there in the SI system?
Answer
(C)
7