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1 : Which of the following pairs of quantities may be measured in the same unit?
A
:
Hate and temperature
B
:
Temperature and area
C
:
Heat and work
D
:
Length and work
2 : Express 0.0000840 in scientific notation:
A
:
8.40*10-3
B
:
840*10-6
C
:
8.40*10-4
D
:
84.0*10-5
3 : In SI unit of pressure is expressed in:
A
:
Newton per metre
B
:
Newton per metre square
C
:
Joule
D
:
Pascal
4 : Which symbol is used for kilogram in SI units?
A
:
K
B
:
k
C
:
Kgm
D
:
kg
5 : In SI unit prefix nano means:
A
:
10-9
B
:
10-8
C
:
10-11
D
:
10-12
6 : 65°C is equivalent to:
A
:
208K
B
:
338K
C
:
403K
D
:
300K
7 : But prefix is used for 10-12?
A
:
Mega
B
:
Pico
C
:
Giga
D
:
Tessa
8 : In which unit we usually measured the energy present in the food?
A
:
Kilojoules
B
:
Megajoules
C
:
Calorie
D
:
Joule
9 : What does a mole represent?
A
:
Number
B
:
Mass
C
:
Volume
D
:
Length
10 : Miss you not a volume should really be used in chemistry?
A
:
Millilitre
B
:
Litre
C
:
Cubic centimeter
D
:
Cubic metre
11 : Why is standardization important in science?
A
:
To confuse scientists
B
:
To share ideas properly
C
:
To increase units
D
:
To avoid SI units
12 : What problem arises with different units?
A
:
Easy communication
B
:
Confusion and time waste
C
:
Fewer conversions
D
:
Simplified data sharing
13 : What are SI units?
A
:
Country-specific units
B
:
Standard global units
C
:
Imperial units
D
:
Non-base 10 units
14 : What is the advantage of SI units being base 10?
A
:
Harder to learn
B
:
Easier to use
C
:
Less precise
D
:
Complicates communication
15 : What are SI units?
A
:
Units used only in one country
B
:
Standard units adopted worldwide
C
:
A system based on imperial units
D
:
A system that avoids base 10
16 : To change SI units by factors of ten smaller or bigger units they use:
A
:
Prefixes
B
:
Symbols
C
:
Abbreviation
D
:
Ratio
17 : A measuring cylinder is used to measure:
A
:
mass
B
:
area
C
:
volume
D
:
level of liquid
18 : Amount of a substance in terms of numbers is measured in:
A
:
gram
B
:
kilogram
C
:
newton
D
:
mole
19 : What is the derived unit of volume?
A
:
m³
B
:
kg/m³
C
:
m²
D
:
N
20 : What is the SI unit of length?
A
:
kg
B
:
m
C
:
s
D
:
mol
21 : Can a measurement be precise but not accurate?
A
:
Yes
B
:
No
C
:
Only if random errors occur
D
:
Only if systematic errors occur
22 : Which one of the following unit is not derived unit?
A
:
Pascal
B
:
Kilogram
C
:
newton
D
:
watt
23 : 1 micro (μ) =
A
:
10^-3
B
:
10^-6
C
:
10^-9
D
:
10^-12
24 : What is a systematic error?
A
:
Unpredictable changes
B
:
Constant error in measurements
C
:
Random variations
D
:
Environmental factors
25 : What is accuracy?
A
:
Closeness of measurements to each other
B
:
Closeness to the true value
C
:
Random variations
D
:
Instrument limitation
26 : How does systematic error affect measurements?
A
:
Increases precision
B
:
Reduces accuracy
C
:
Increases randomness
D
:
Reduces skill
27 : In SI, the unit of mass is:
A
:
kilogram
B
:
centimeter
C
:
kelvin
D
:
millimeter
28 : What is an error in measurement?
A
:
Exact value
B
:
Difference between measured and actual value
C
:
Precision of instrument
D
:
Skill of the student
29 : In the measuring instruments, the degree of conformity and closeness to the true value is known as:
A
:
precision
B
:
accuracy
C
:
Sensitivity
D
:
Compatibility
30 : What is a random error?
A
:
Predictable changes
B
:
Constant error in measurements
C
:
Unpredictable variations
D
:
Instrument calibration
31 : The property of a measuring instrument to give the output very close to the actual value is termed as:
A
:
Sensitivity
B
:
accuracy
C
:
Precision
D
:
Repeatability
32 : The number of base units in SI are:
A
:
3
B
:
6
C
:
7
D
:
9
33 : What is the definition of a mole?
A
:
6.022 x 10^23 particles
B
:
1000 cm³ of water
C
:
9,192,631,770 cycles
D
:
273 of triple point of water
34 : The base quantity is:
A
:
mass
B
:
volume
C
:
torque
D
:
momentum
Chapter 12 : Empirical Data Collection and Analysis
Chemistry 9th MCQs || Ilam Ghar
Chemistry 9th
