WorksheetsUAS Bahasa Inggris Teknik PTB C Th 2025
Total questions: 40
Worksheet time: 20mins
What is the main purpose of the Specific Gravity and Water Absorption Test?
To measure concrete strength
To determine specific gravity
To test soil shear strength
To check bitumen hardness
Why must aggregates be soaked before testing? (on Specific Gravity and Water Absorption Test)
To clean surface dirt only
To ensure complete saturation
To increase weight artificially
To speed up weighing
In the weighing procedure, what condition represents saturated surface-dry (SSD) state? (on Specific Gravity and Water Absorption Test)
Wet and dripping aggregates
Oven-dried aggregates
Aggregates with no visible moisture
Submerged aggregates
Why is specific gravity calculated using weights in air, water, and SSD conditions?(on Specific Gravity and Water Absorption Test)
To measure color changes
To account for both volume displacement
To test temperature only
To compact the sample
Which procedural step is most critical for accurate porosity determination, and why?(on Specific Gravity and Water Absorption Test)
Oven-drying, as it prevents underestimation of voids
SSD weighing, because inaccurate SSD leads to flawed absorption ratios
Soaking duration, as short soaking ignores pore filling
Submersion time, as it affects only density
What is the primary purpose of the Concrete Mixing Machine?
To test aggregate abrasion
To produce homogeneous concrete
To measure soil limits
To level ground points
What is the correct mixing sequence for laboratory concrete?(on Concrete Mixing Machine and Compaction Tools)
Water first, then cement
Aggregates first, then cement, water
Cement first, then aggregates
Water and aggregates only
When should mixing timing begin for homogeneity? (on Concrete Mixing Machine and Compaction Tools)
From adding water
After all materials are introduced into the mixer
During compaction
Before safety checks
What safety risk arises from improper machine operation sequence? (on Concrete Mixing Machine and Compaction Tools)
Only electrical overload
Chemical burns from cement
Over-compaction only
Reduced mixing time
Which safety modification enhances operation beyond standard procedures? (on Concrete Mixing Machine and Compaction Tools)
Operating without protective gear
Verifying emergency stop functionality
Mixing without lid for ventilation
Skipping material proportion checks
What does the Los Angeles Abrasion Machine primarily test?
Soil cohesion
Toughness and abrasion resistance
Bitumen penetration
Level elevations
Why are steel balls added to the machine drum? (on Los Angeles Abrasion Machine)
To increase weight only
To simulate abrasive action
To balance rotation
To measure temperature
What does weight loss after rotation represent? (on Los Angeles Abrasion Machine)
Moisture content
Degree of aggregate degradation
Steel ball wear
Drum efficiency
Why is the rotation speed standardized at 30-33 rpm? (on Los Angeles Abrasion Machine)
To minimize energy use
To replicate realistic road surface
To shorten test duration
To avoid overheating only
Reducing revolutions below standard would affect results how? (on Los Angeles Abrasion Machine)
Overestimate abrasion resistance
Underestimate toughness
No impact on aggregates
Increase porosity alone
What is the purpose of the AIV (Aggregate Impact Value) Test?
To mix concrete
To evaluate resistance of aggregates to sudden impact or shock
To test shear strength
To measure penetration
Why is the sample sieved to specific sizes before testing? (on Aggregate Impact Value Test)
To remove fines only
To ensure uniform particle size
To add water
To compact loosely
What does material passing 2.36 mm sieve after impact indicate? (on Aggregate Impact Value Test)
Strong aggregates
Extent of aggregate breakage
Sample compaction
Hammer condition
Why is the sample compacted in three layers? (on Aggregate Impact Value Test)
Overestimates impact resistance
Underestimates due to reduced shock energy
Affects fines only
No procedural effect
Lowering hammer drop height below standard impacts AIV (Aggregate Impact Value Test) how?
Overestimates impact resistance
Underestimates due to reduced shock energy
Affects fines only
No procedural effect
What parameters does the Direct Shear Test determine?
Liquid and plastic limits
Cohesion and angle of friction of soil
Aggregate specific gravity
Bitumen consistency
Why is shearing rate adjusted based on soil type? (on Direct Shear Test)
To speed up testing
To allow drainage in sands
To reduce box friction
To increase normal load
What does peak shear stress variation with normal stress represent? (on Direct Shear Test)
Soil color
Friction angle
Sample height
Water content only
Why prepare soil at natural moisture content? (on Direct Shear Test)
To dry faster
To replicate in-situ stress-strain
To boost cohesion
To minimize shear rate
(HOTs - Evaluating) Ignoring normal stress variation invalidates which parameter most? (on Direct Shear Test)
A. Shearing rate
B. Cohesion
C. Box dimensions
D. Sample saturation
What does the Atterberg Limits Test determine?
Aggregate abrasion
Liquid limit and plasticity index of soil
Concrete homogeneity
Level readings
How is Plasticity Index (PI) conceptually defined? (on Atterberg Limits Test, LL=liquid limit, PL = Plastic Limit)
LL + PL
Difference between LL and PL
LL divided by PL
Average of limits
What does groove closure in liquid limit test measure? (on Atterberg Limits Test, LL=liquid limit, PL = Plastic Limit)
Soil color
Transition from liquid to plastic
Drying rate
Compaction effort
Why standardize groove depth to 2 mm width at base? (on Atterberg Limits Test)
To ensure consistency and accuracy in test results
To make the test easier to perform
To reduce the amount of soil required
To speed up the testing process
High PI indicates what soil behavior issue for construction? (on Atterberg Limits Test)
High stability
Excessive compressibility
Low plasticity ideal for roads
Suitable for all foundations
What is the purpose of Automatic Level and Leveling Staff?
To mix bitumen
To determine elevation
To test impact value
To shear soil
What does a back sight reading conceptually provide (on Automatic Level and Leveling Staff)?
Ground elevation directly
Height of instrument
Fore sight distance
Staff tilt
How is elevation change determined from sights (on Automatic Level and Leveling Staff)?
Back sight minus fore sight
Fore sight plus back sight
Average of readings
Instrument height only
Why rotate level 90° during setup? (on Automatic Level and Leveling Staff)
To measure horizontal distance
To check circular level bubble
To read staff quicker
To profile vertically
Excessive fore sight distance causes what error in profile leveling? (on Automatic Level and Leveling Staff)
Improved precision
Elevation inaccuracy
Back sight compensation
Negligible effect
What is the purpose of Bitumen Penetration Test?
To test soil friction
To determine hardness
To compact concrete
To level staff
Why is test temperature strictly controlled (in Bitumen Penetration Test)?
To harden needle
Because penetration varies
To reduce load
To speed reading
What does needle penetration depth under load represent? (in Automatic Level and Leveling Staff)
Temperature change
Bitumen softness
Surface tension
Time duration
Why apply 100 g load for 5 seconds in Automatic Level and Leveling Staff?
To minimize time
To standardize penetration
To cool sample
To measure width
Penetration exceeding specification indicates what bitumen issue?
Too hard for cold climates
Excessive softness
Ideal hardness
Meets all grades
