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WorksheetsMechanical Tools and Measurement — Grade 10 Worksheet Extract
Total questions: 40
Worksheet time: 20mins
When removing a very tight wheel nut, a regular ring spanner cannot do the job. Which tool is most effective to use?
Impact driver
Impact wrench
Open-end wrench
Combination pliers
File
When tightening cylinder head bolts, technicians use a torque wrench. Why is using other tools considered inappropriate?
It takes longer
Torque is not precise
It feels uncomfortable
It wastes energy
It is hard to install
While measuring a piston rod using a vernier caliper, the readings vary. What is the most likely cause?
The tool is too new
Holding pressure is too strong
The piston is too heavy
The scale is unclear
The piston surface is smooth
A micrometer is used to measure brake lining thickness. Why is a micrometer more accurate than a vernier caliper?
It is more expensive
It has more vernier scales
It has finer resolution (0.01 mm)
It is lighter
It measures faster
If a dial indicator shows the needle moving up and down as a shaft is rotated, what does this phenomenon indicate?
Cold shaft
Shaft too thick
Shaft is off-center/run-out
New shaft
Rusty shaft
Measuring an engine cylinder diameter is typically done with a dial bore gauge because...
It is cheaper
It can reach the narrow cylinder bore
It produces numbers automatically
It needs no adjustment
It is faster than a ruler
In using an electric drill, what is the biggest risk if the rotation speed is too high?
Battery drains quickly
Drill bit becomes dull and hot
Cable breaks easily
The drill becomes lighter
It adds noise
When checking valve clearance, a reading error with a feeler gauge can occur if...
The valve is cold
The feeler gauge is too thick
It is pulled too hard
The valve is already clean
The rocker arm is smooth
A student measures the outer diameter of a bearing with a vernier caliper and gets inconsistent repeated results. What should be checked?
Bearing color
Holding pressure on the caliper jaws
Bearing brand
Hand temperature
Table height
Using an air impact wrench on a small bolt can cause...
More stable rotation
The bolt loosens easily
The bolt breaks due to excessive torque
Higher precision
Quieter sound
A dial indicator is mounted on a magnetic stand. If the stand does not grip strongly enough, what is the impact?
The needle stays still
Measurement is unstable
The machine stops
The shaft becomes smooth
While cutting a pipe with a hand grinder, a student sees excessive sparks. This most likely indicates…
The speed is too low
The grinding wheel is dull
The electrical voltage is low
The pipe is too thick
The pipe is wet
A micrometer must be calibrated with a standard bar. The purpose is…
To make it lighter
To reduce friction
To ensure measurement accuracy
To save time
To speed up thimble rotation
Errors when reading a vernier caliper usually occur because…
The zero scale is slippery
Misreading the vernier lines
The handle is loose
The material is too hard
The tool is too short
A student measures a cylinder and obtains a high ovality value. What is the most appropriate technical action?
Clean the cylinder
Measure again
Perform boring
Replace only the piston
Heat the engine
A torque wrench is used to tighten a cylinder head because…
The bolts are long
The machine is modern
Specific and uniform torque is required
It is more comfortable
It saves time
If a micrometer is dropped, what is the most correct action?
Use it as usual
Just clean it
Recalibrate before use
Oil it
Replace the ratchet
A dial bore gauge requires an accompanying tool, namely…
Feeler gauge
Vernier caliper
Micrometer used as the diameter reference
Impact screwdriver
Torque wrench
If a vernier caliper is hard to slide, the best solution is…
Tap it lightly
Clean it and apply a thin lubricant
Soak it in water
Cut the jammed part
Shake it forcefully
A power drill is used to loosen a brake disc bolt, but the bolt does not move. What is the safest step?
Increase pressure until the bolt breaks
Drill the bolt head
Switch to an impact wrench
Hit the bolt
Pour water on it
When measuring brake pad thickness, a technician chooses an outside micrometer because…
It has small jaws
Its ratchet provides constant pressure
It is cheaper
It has a brighter color
It does not require lubricant
Measurement error with a dial indicator occurs if…
The needle is large
The probe is not perpendicular to the surface
The scale numbers are small
The base is too light
A hand grinder should not be pressed too hard because…
the motor will accelerate
the grinding wheel immediately breaks
rotation drops and heat increases
dust decreases
sound disappears
After measuring a piston’s diameter with a caliper, a student immediately records the value without any cross‑check. What is the risk?
time becomes shorter
the value can be wrong because several points were not measured
it becomes more precise
it saves energy
the tool becomes cold
Why should a dial bore gauge be moved slightly left and right when searching for the minimum reading?
to add numbers
to reduce friction
to find the true diameter at the tightest point
to work faster
so the needle moves farther
While using a torque wrench, the torque reading is off because the student holds the handle end too close to the center. Why is this wrong?
it reduces effective force
it increases friction
it makes the tool hot
the weight is too small
it tightens faster
Using cutting pliers to cut hard steel wire causes…
a neater result
the pliers to break or become dull
less time needed
the wire to become soft
tension to disappear
A micrometer must not be used on a rotating object because…
the tool’s weight
it can damage the spindle and the workpiece
the scale moves quickly
it is not long enough
it is dirty
A digital vernier caliper beeps an error while in use. What is the first action?
hit it
replace the battery
submerge it in water
increase the voltage
cut the cable
A dial indicator functions well if…
it is rotated quickly
the probe touches the surface without excessive pressure
it is shaken strongly
it is pressed maximally
it is mounted tilted
Why should power tools not be used in wet areas?
they can become clogged
electric shock can occur
the drill becomes heavier
the sound is louder
the drill bit becomes dull
A student uses a caliper to measure the internal diameter of a cylinder. The result is inaccurate because…
the caliper jaws cannot properly contact the walls
the caliper is too new
the scale is large
the caliper is light in weight
the scale color is dim
A dial bore gauge shows that a cylinder is not perfectly round. What is the impact on the engine?
the engine becomes cooler
compression leaks and power decreases
fuel consumption decreases
the sound becomes quieter
A micrometer is used with the ratchet stop technique. What is the purpose of using the ratchet stop?
To speed up measurement
To equalize measurement pressure
To increase spindle length
To reduce noise
To clean the workpiece
A vernier caliper should be stored with the jaws fully closed to prevent what?
Battery leakage
Jaws bending or exposure to dust
Color fading
Numbers changing
Weight increasing
A student operates a hand grinder using only one hand. What is the greatest risk in this situation?
Reduced sparks
Tool remains stable
Loss of control of the tool
Lower rotation speed
A cooler grinding wheel
A micrometer does not read zero when fully closed. What does this indicate?
A new scale was installed
The instrument requires recalibration
The measuring faces are perfectly clean
The ratchet operates smoothly
The temperature is stable
When a dial indicator is used to check gear clearance, a large reading indicates what condition?
The gear is still new
Backlash is large and needs adjustment
The gear is lightweight
The gear is too thick
The gear material is soft
A vernier caliper must be read with the eye aligned with the scale because this helps to do what?
Make the light brighter
Avoid parallax error
Make the scale look larger
Read faster
Prevent fatigue
To measure cylinder wall wear accurately, which tool combination is the most appropriate?
Feeler gauge and caliper
Screwdriver and micrometer
Dial bore gauge and micrometer
Pliers and vernier caliper
Vernier caliper only
