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Physics for IGCSE & O level - Measurements And Units (Section 5)

1
What is the unit of electric power?
Answer
(D)
Watt
2
What does the text mention about the volume of a rectangular block?
Answer
(B)
volume = length x width x height
3
What does the prefix 'centi-' represent in relation to a base unit?
Answer
(C)
1/100
4
Which of the following prefixes represents 10^-6?
Answer
(B)
Micro
5
If a car travels 100 km in 2 hours, what is its average speed?
Answer
(A)
50 km/h
6
What is the SI unit of electric current?
Answer
(A)
Ampere
7
What does the revision checklist suggest is a core level concept?
Answer
(D)
Using the equation linking density, mass, and volume
8
What is the purpose of using a measuring cylinder?
Answer
(C)
To measure volume
9
If an object's mass is 20 kg and its volume is 10 m³, what is its density?
Answer
(B)
0.5 kg/m³
10
Which of the following are used for measuring the time?
Answer
B
C
11
Which measurement scale would be used for the mass of an object?
Answer
(C)
Balance
12
Which of the following units can be combined?
Answer
A
B
C
D
13
What is the primary purpose of a stopwatch?
Answer
(C)
To measure time intervals
14
What is the relationship between density and whether an object floats or sinks in a liquid?
Answer
(C)
If an object is denser than the liquid, it will sink.
15
What is the formula for finding the speed of an object?
Answer
(B)
distance / time
16
What is an example of a non-SI unit?
Answer
(D)
Liter
17
In scientific notation, how many significant figures does 3.20 x 10^3 have?
Answer
(C)
3
18
What is the relationship between mass and weight?
Answer
(C)
Weight is affected by gravity; mass is not.
19
In the context of measuring liquids, what is the measuring cylinder's primary function in relation to density?
Answer
(B)
To measure the volume of the liquid.
20
Which property is found by dividing mass by volume?
Answer
(C)
Density
21
Which substance listed below is the least dense?
Answer
(B)
Kerosene
22
Which prefix is used to denote one-thousandth?
Answer
(C)
Milli
23
In the context of measurements, what does 'accuracy' refer to?
Answer
(B)
How close a measurement is to the true or accepted value.
24
What information is necessary to calculate density?
Answer
(B)
Mass and volume
25
What is the formula to calculate area?
Answer
(B)
Length x Width
26
Which instrument is most appropriate for measuring the length of a table?
Answer
(C)
A ruler or measuring tape
27
The device used to measure the mass of an object by balancing it with known masses is called a:
Answer
(B)
Beam balance
28
What does the abbreviation 'SI' stand for?
Answer
(B)
System International
29
Which of the following is an example of a derived quantity?
Answer
(C)
Force
30
What is the SI unit for measuring the quantity of an object?
Answer
(B)
Mole
31
What is the base unit for time in the SI system?
Answer
(C)
Second
32
In the example of the balloon, how does heating the air affect it?
Answer
(B)
It expands and the density decreases.
33
Which of the following instruments can be used to measure volume?
Answer
A
C
34
Which instrument is used for measuring density?
Answer
(B)
Balance
35
What is the definition of 'matter'?
Answer
(B)
Anything that takes up space and has mass
36
Which of the following is a way to express speed?
Answer
(A)
Meters per second
37
What units would be suitable for measuring the area of a field?
Answer
(D)
Square meters
38
What is the standard measurement for the density of a liquid (or specific gravity)?
Answer
(B)
kg/m³
39
If 1 cm³ of mercury has a mass of 13.6 g, and 1 cm³ of water has a mass of 1 g, which statement is true?
Answer
(B)
1 cm³ of water has a smaller mass than 1 cm³ of mercury
40
What is the unit of measure for angles, used in this unit?
Answer
(C)
Degree
41
If the density of an object is 5 g/cm³, would it sink or float in water (density of water = 1 g/cm³)?
Answer
(A)
Sink
42
What is the relationship between a liter and a milliliter?
Answer
(C)
1 L = 1000 mL
43
Which of the following statements is the most accurate, based on the given context?
Answer
(C)
Ice is less dense than water, and therefore icebergs float.
44
Which of the following are SI units?
Answer
A
B
C
45
Which of the following are examples of base units in the SI system?
Answer
A
B
C
46
What type of instrument is mostly suitable for measuring mass?
Answer
(C)
A balance
47
Which substance has the greatest density below?
Answer
(C)
Mercury
48
Which is the simplest way of finding the mass of something?
Answer
(B)
Using a beam balance
49
What is a method for measuring the volume of a solid object?
Answer
(B)
By using a ruler and measuring its dimensions.
50
What is the density of water?
Answer
(A)
1.0 g/cm³