Physics for IGCSE & O level - Measurements And Units (Section 4)
1
Which of the following is a unit for measuring pressure?
Answer
(A)
Pascal
2
Which of the following is not a unit of time?
Answer
(D)
Kilogram
3
Which unit is generally used for time?
Answer
(C)
Seconds
4
What units are generally used for the area?
Answer
(C)
cm²
5
What does the prefix 'deci-' represent?
Answer
(B)
1/10
6
What is the SI unit for amount of substance?
Answer
(A)
mole
7
How to calculate the volume of a regular object?
Answer
(A)
Length x Width x Height
8
What will happen if some water is tipped into petrol?
Answer
(C)
The water will sink to the bottom of the petrol.
9
How many base units does the SI system have?
Answer
(C)
7
10
What is the name of the unit for electrical resistance?
Answer
(C)
Ohm
11
What does the prefix 'kilo' represent?
Answer
(B)
1000
12
What is the primary function of the prefix 'centi-'?
Answer
(D)
To divide by 100
13
Which of the following is a correct unit conversion?
Answer
(A)
1 cm = 10 mm
14
When measuring the volume of a solid, what must be considered?
Answer
A
C
15
Which of these statements best describes how to measure the mass using a beam balance?
Answer
(A)
Weigh the object in one pan then add standard masses to the other pan until the beam balances.
16
What is the purpose of scientific notation?
Answer
(B)
To simplify very large or very small numbers.
17
Which instrument would you use to accurately measure the volume of an irregular object?
Answer
(C)
Graduated cylinder and water
18
What unit is used to measure mass in the context of the beam balance?
Answer
(A)
Kilograms (kg)
19
What is the name of the process used to estimate the volume of an irregular solid?
Answer
(B)
Displacement
20
What does the term 'zero error' mean in the context of measurement?
Answer
(A)
An error caused by not setting a measuring instrument to zero.
21
Which of the following is a property of matter?
Answer
(B)
Mass
22
What is the correct unit for measuring the volume of a cube with sides of 1 meter?
Answer
(C)
1 cubic meter
23
What instrument is shown that measures mass?
Answer
(B)
Balance
24
In the formula for density (density = mass/volume), what is the relationship between density and volume if mass remains constant?
Answer
(B)
Density and volume are inversely proportional.
25
What is the formula for calculating density?
Answer
(A)
mass/volume
26
If the air in the balloon has a volume of 0.008 m³ and the density is 1.3 kg/m³ when cold, what would you need to calculate to find the mass of the air when cold?
Answer
(A)
Multiply volume by density.
27
What is the name of the SI unit for luminous intensity?
Answer
(A)
Candela
28
Which unit would be the most appropriate to measure the thickness of a sheet of paper?
Answer
(A)
Millimeter
29
If an object floats in water, what can you conclude about its density compared to water?
Answer
(A)
It is less dense than water.
30
Which of the following is used to check the density of a liquid?
Answer
(B)
Hydrometer
31
Which of the following is NOT a step in the displacement method?
Answer
(D)
Measure the weight of the object when submerged.
32
Which of the following prefixes signifies a value of 1000?
Answer
(C)
Kilo
33
What is the formula for calculating density?
Answer
(C)
Mass / Volume
34
What is the symbol for density?
Answer
(C)
ρ
35
Which quantity is calculated by multiplying length and width?
Answer
(C)
Area
36
What is the approximate average density of the Earth?
Answer
(B)
9520 kg/m³
37
What is the correct way to write 0.000025 in scientific notation?
Answer
(B)
2.5 x 10^-5
38
How can the volume of an irregular solid be measured?
Answer
(B)
By using a displacement method.
39
How many milligrams are in a gram?
Answer
(C)
1000
40
What is the correct formula relating mass, density, and volume?
Answer
A
B
C
41
What is the mass of an object that has a density of 4 g/cm³ and a volume of 5 cm³?
Answer
(C)
20 g
42
Which of these are prefixes related to power of 10?
Answer
A
B
C
D
43
What is the relationship between a second, a millisecond, and a microsecond?
Answer
(A)
1 second = 1000 milliseconds; 1 millisecond = 1000 microseconds
44
Which of the following is an example of a unit for speed?
Answer
(B)
m/s
45
What unit is commonly used to measure the speed of a car?
Answer
(C)
Miles per hour
46
If an equation is correctly balanced and you have units of meters and seconds, what can the units of your answer represent?
Answer
(C)
Speed
47
Which of the following is an example of a derived unit?
Answer
(C)
Square Meter
48
What can be said about Earth's core?
Answer
(B)
It is probably mainly iron.
49
How can you make units bigger or smaller?
Answer
(C)
By using prefixes
50
What is the base unit of luminous intensity in the SI system?
