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SLA Officer Cadet Exam study materials
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SLA Officer Cadet Exam practice questions

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Question 1English Language and Verbal Reasoning

In a ship's log entry, choose the option that correctly completes the sentence: 'The duty officer reported that the cargo ___ been secured before departure.'

  1. has
  2. have
  3. had Correct answer.
  4. having

Explanation

The reporting verb 'reported' is in the past, so the earlier action of securing the cargo needs the past perfect 'had been secured'. 'Have' and 'has' would place the securing at the same time or later than the report, which breaks the sequence of events.

Question 2English Language and Verbal Reasoning

A cadet writes: 'The vessel's manifest, along with the crew list, ___ submitted to the port authority.' Which verb form completes the sentence correctly?

  1. are
  2. was Correct answer.
  3. have been
  4. were

Explanation

The subject is 'manifest', which is singular; the phrase 'along with the crew list' is parenthetical and does not change the number of the subject. A singular subject takes the singular past verb 'was'.

Question 3English Language and Verbal Reasoning

Which word is the best synonym for 'meticulous' as used in a performance report: 'The cadet kept meticulous records of every watch'?

  1. Careless
  2. Scrupulous Correct answer.
  3. Rapid
  4. Casual

Explanation

'Meticulous' describes someone who shows great attention to detail, and 'scrupulous' carries the same sense of careful exactness. The other options describe the opposite quality or an unrelated one.

Question 4English Language and Verbal Reasoning

In the sentence 'The bosun, who had served twenty years at sea, trained the new cadets,' what grammatical role does the clause 'who had served twenty years at sea' play?

  1. It is a restrictive clause identifying which bosun is meant.
  2. It is a non-restrictive clause adding extra information about the bosun. Correct answer.
  3. It is a noun clause acting as the object of 'trained'.
  4. It is an adverbial clause of time modifying 'trained'.

Explanation

The clause is set off by commas and begins with 'who', so it adds supplementary information about an already identified person. A restrictive clause would not be comma-separated because it would be essential to identify the noun.

Question 5English Language and Verbal Reasoning

Choose the option that correctly completes this radio message: 'All stations, this is Harbour Control. A vessel ___ the fairway; keep clear.'

  1. obstructs
  2. is obstructing Correct answer.
  3. has obstruct
  4. obstruct

Explanation

The message describes an action happening at the moment of speaking, so the present continuous 'is obstructing' is required. The simple present forms describe habitual actions, and 'has obstruct' is grammatically incomplete.

Question 6English Language and Verbal Reasoning

Which option gives the correct spelling for a document that lists a ship's cargo and is commonly required by customs?

  1. Manifast
  2. Manefest
  3. Manifest Correct answer.
  4. Manifist

Explanation

The correct spelling is 'manifest', a noun meaning a detailed list of a ship's cargo. The other spellings use incorrect vowel patterns that do not match the standard English word.

Question 7English Language and Verbal Reasoning

Select the word that best completes the sentence: 'The cadet's report was ___; it contained several unverified claims about the collision.'

  1. concise
  2. dubious Correct answer.
  3. reliable
  4. exemplary

Explanation

The second clause states that the report contained unverified claims, so the missing adjective must express doubt. 'Dubious' means questionable or not to be trusted, which fits the context.

Question 8English Language and Verbal Reasoning

Identify the part of speech of the underlined word in this order entry: 'Secure all hatches before the storm arrives.' Here, 'Secure' functions as which part of speech?

  1. Noun
  2. Adjective
  3. Adverb
  4. Verb Correct answer.

Explanation

In this imperative sentence, 'Secure' is the command word telling someone to make fast the hatches, so it acts as a verb. It is not describing a noun or naming a thing.

Question 9English Language and Verbal Reasoning

A cadet's incident report reads: 'The mooring line parted, the vessel drifted from the berth.' What is the structural problem with this sentence?

  1. It uses a subordinating conjunction incorrectly.
  2. It contains a comma splice joining two independent clauses. Correct answer.
  3. It lacks a subject in the second clause.
  4. It is a sentence fragment with no main verb.

Explanation

Both 'The mooring line parted' and 'the vessel drifted from the berth' are independent clauses, and a comma alone cannot join them. The fix is a semicolon, a full stop, or a coordinating conjunction such as 'and'.

Question 10English Language and Verbal Reasoning

Which sentence uses the semicolon correctly in a navigational instruction?

  1. The buoy was unlit; and the approach was hazardous.
  2. The buoy was unlit; the approach, was hazardous.
  3. The buoy was unlit, therefore; the approach was hazardous.
  4. The buoy was unlit; therefore, the approach was hazardous. Correct answer.

Explanation

A semicolon may join two independent clauses, and the conjunctive adverb 'therefore' is correctly followed by a comma. This produces a properly punctuated compound sentence.

Question 11English Language and Verbal Reasoning

Read the passage: 'Although the forecast predicted calm seas, the watch officer ordered lifejackets worn. Squalls can develop within minutes in this region, and the crew had been caught unprepared the previous month.' Why did the watch officer order lifejackets?

  1. Because local squalls can arise suddenly and the crew had previously been unprepared. Correct answer.
  2. Because the forecast had warned of severe storms.
  3. Because the lifejackets had passed their inspection date.
  4. Because the crew refused to wear them voluntarily.

Explanation

The passage states the forecast predicted calm seas, so the officer's caution rests on the rapid onset of squalls and the crew's earlier lack of readiness. The correct option combines both stated reasons.

Question 12English Language and Verbal Reasoning

Choose the option that best restates the meaning of: 'The master insisted that the defect be logged before the vessel sailed.'

  1. The master logged the defect himself before departure.
  2. The master denied that any defect needed recording.
  3. The master insisted on logging the defect only after sailing.
  4. The master required the defect to be recorded prior to departure. Correct answer.

Explanation

The original uses the subjunctive 'be logged' to express a requirement, and 'before the vessel sailed' means prior to departure. The correct paraphrase preserves both the obligation and the timing.

Question 13English Language and Verbal Reasoning

Which option correctly completes the sentence using the subjunctive mood: 'The port authority requires that every vessel ___ a valid safety certificate.'

  1. carries
  2. carried
  3. carry Correct answer.
  4. is carrying

Explanation

After verbs of requirement such as 'requires that', formal English uses the base form of the verb regardless of the subject's number. 'Carry' is the base form and correctly expresses the mandated action.

Question 14English Language and Verbal Reasoning

In the sentence 'Having completed the inspection, the engineer filed the report,' what does the opening phrase modify?

  1. The engineer Correct answer.
  2. The inspection
  3. The report
  4. The filing

Explanation

A participial phrase at the start of a sentence should modify the subject of the main clause. The subject here is 'the engineer', who completed the inspection and then filed the report.

Question 15English Language and Verbal Reasoning

Choose the most appropriate word to complete this formal log entry: 'The cadet was ___ for failing to report the oil spill.'

  1. reprimanded Correct answer.
  2. reprimanding
  3. reprimands
  4. reprimand

Explanation

The passive construction 'was ___' requires a past participle. 'Reprimanded' is the past participle and correctly completes the passive voice.

Question 16English Language and Verbal Reasoning

Which word is the best antonym for 'hazardous' in the sentence 'The channel was hazardous after the storm'?

  1. Safe Correct answer.
  2. Perilous
  3. Uncertain
  4. Risky

Explanation

'Hazardous' means dangerous, so its antonym must express the absence of danger. 'Safe' is the direct opposite, while the other options are synonyms or near-synonyms.

Question 17English Language and Verbal Reasoning

A cadet writes: 'Neither the chief officer nor the deckhands was aware of the change in berth.' Which revision makes the sentence grammatically correct?

  1. Neither the chief officer or the deckhands was aware of the change in berth.
  2. Neither the chief officer nor the deckhands is aware of the change in berth.
  3. Neither the chief officer nor the deckhands been aware of the change in berth.
  4. Neither the chief officer nor the deckhands were aware of the change in berth. Correct answer.

Explanation

With 'neither...nor', the verb agrees with the nearer subject. 'Deckhands' is plural, so the plural past verb 'were' is correct.

Question 18English Language and Verbal Reasoning

Read the notice: 'Berth 4 will be unavailable from 06:00 to 14:00 for dredging. Vessels scheduled to arrive during this window must contact Harbour Control for an alternative berth.' What must an arriving vessel do?

  1. Cancel its port call entirely.
  2. Contact Harbour Control to arrange a different berth. Correct answer.
  3. Proceed to Berth 4 and anchor inside it.
  4. Wait offshore until 14:00 without contacting anyone.

Explanation

The notice states that vessels arriving during the closure must contact Harbour Control for an alternative berth. The correct option restates this instruction directly.

Question 19English Language and Verbal Reasoning

Choose the option that correctly uses a colon in a ship's report.

  1. The inspection: revealed three faults, a cracked hatch, a loose rail, and a faulty pump.
  2. The inspection revealed: three faults a cracked hatch, a loose rail, and a faulty pump.
  3. The inspection revealed three faults, a cracked hatch: a loose rail, and a faulty pump.
  4. The inspection revealed three faults: a cracked hatch, a loose rail, and a faulty pump. Correct answer.

Explanation

A colon introduces a list after a complete clause, and here 'The inspection revealed three faults' is a complete clause followed by the list. The comma-separated items in the list are also correctly punctuated.

Question 20English Language and Verbal Reasoning

In the sentence 'The officer to whom the report was addressed signed it immediately,' why is 'whom' used rather than 'who'?

  1. Because it introduces a non-restrictive clause.
  2. Because it refers to an inanimate object.
  3. Because it is the object of the preposition 'to'. Correct answer.
  4. Because it is the subject of the relative clause.

Explanation

'Whom' is the objective case form of the relative pronoun, required here because it serves as the object of the preposition 'to'. 'Who' would be used if the pronoun were the subject of the clause.

Question 21English Language and Verbal Reasoning

Which sentence avoids a dangling modifier while describing an inspection?

  1. Inspecting the hull, a crack appeared in the plating.
  2. After inspecting the hull, the crack was obvious to the plating.
  3. After inspecting the hull, the diver found a crack in the plating. Correct answer.
  4. After inspecting the hull, a crack was found in the plating.

Explanation

The introductory participial phrase must modify the subject of the main clause. In the correct sentence, 'the diver' is the one who inspected the hull, so the modifier is properly attached.

Question 22English Language and Verbal Reasoning

Choose the word that best fits this sentence from a stability report: 'The vessel's list was ___, so the master ordered ballast shifted to port.'

  1. pronounced Correct answer.
  2. unrecorded
  3. negligible
  4. customary

Explanation

The master's decision to shift ballast indicates the list was significant enough to correct. 'Pronounced' means clearly noticeable, which fits the corrective action.

Question 23English Language and Verbal Reasoning

Analyse this sentence: 'Only after the lifeboat drill had ended did the cadets realise how poorly they had performed.' What is the effect of starting with 'Only after'?

  1. It makes the sentence ungrammatical because of the past perfect.
  2. It changes the sentence into a question.
  3. It requires inversion of the auxiliary and subject in the main clause. Correct answer.
  4. It turns the main clause into a subordinate clause.

Explanation

When a sentence opens with a negative or restrictive adverbial such as 'Only after', standard English inverts the auxiliary and subject in the main clause, giving 'did the cadets realise'. The past perfect in the subordinate clause is correct because the drill ended before the realisation.

Question 24English Language and Verbal Reasoning

Read the passage: 'The investigation found that the collision was caused not by equipment failure but by a breakdown in bridge communication. Radar and steering gear functioned within specification throughout.' Which conclusion is best supported?

  1. The steering gear malfunctioned during the approach.
  2. Human factors, not machinery, caused the collision. Correct answer.
  3. The radar failed shortly before the collision.
  4. Equipment failure and communication failure contributed equally.

Explanation

The passage explicitly denies equipment failure as the cause and states that radar and steering gear functioned within specification, pointing instead to a breakdown in bridge communication. That supports a human-factors conclusion.

Question 25English Language and Verbal Reasoning

Which revision removes the ambiguity in this sentence: 'The officer told the cadet that he had made an error in the log'?

  1. The officer told the cadet he had made an error in the log, which was his.
  2. The officer told him that he had made an error in the log.
  3. The officer told the cadet that an error had been made in the log by him.
  4. The officer told the cadet that the cadet had made an error in the log. Correct answer.

Explanation

The pronoun 'he' is ambiguous because it could refer to either the officer or the cadet. Replacing it with the explicit noun 'the cadet' removes the ambiguity, even though it repeats a noun.

Question 26English Language and Verbal Reasoning

A cadet writes in a log entry: 'The duty engineer reported that the auxiliary boiler pressure had dropped, but he could not identify the cause.' Which option identifies the function of the word 'but' in this sentence?

  1. It marks the second clause as a direct consequence of the first.
  2. It introduces a subordinate clause that explains the cause.
  3. It joins two independent clauses and signals contrast between them. Correct answer.
  4. It links two nouns that share the same referent.

Explanation

A coordinating conjunction joins grammatical units of equal rank, and here 'but' connects two independent clauses while signalling a contrast between the reported drop and the engineer's inability to explain it. It does not introduce a subordinate clause, because both clauses can stand alone.

Question 27English Language and Verbal Reasoning

In a cadet's accident report, the sentence 'After securing the lifeboat, the painter was checked by the coxswain' is faulty. Which revision removes the misplaced modifier while keeping the meaning?

  1. After the coxswain secured the lifeboat, he checked the painter.
  2. The painter, after securing the lifeboat, was checked by the coxswain.
  3. After securing the lifeboat, the coxswain checked the painter. Correct answer.
  4. Securing the lifeboat, the painter was checked by the coxswain.

Explanation

An introductory participial phrase must modify the subject of the main clause. In the original, the phrase 'After securing the lifeboat' seems to modify 'the painter', which cannot secure anything, so the subject must be the person who did the securing: the coxswain. Option 1 is also grammatical, but it adds a causal reading and a pronoun that changes the emphasis, whereas option 2 preserves the original sequence in a single clean clause.

Question 28English Language and Verbal Reasoning

A deck log entry reads: 'The bosun confirmed the hatch was secure, the cadets then closed the vents.' Which option best explains the error in this sentence?

  1. It contains a sentence fragment after the comma.
  2. It lacks a subject in the second clause.
  3. It uses the wrong tense in the first clause.
  4. It contains a comma splice joining two independent clauses. Correct answer.

Explanation

Both parts of the sentence could stand alone as complete clauses, and a comma alone cannot join two independent clauses. The writer needs a semicolon, a full stop, or a coordinating conjunction such as 'and' to make the relationship correct.

Question 29English Language and Verbal Reasoning

A cadet must choose the word that best completes this formal entry: 'The master directed that the discrepancy ___ recorded in the official log before departure.'

  1. be Correct answer.
  2. was
  3. will be
  4. is

Explanation

Verbs of demand, direction, and requirement such as 'directed that' take the subjunctive mood in formal writing, and the subjunctive uses the base form of the verb regardless of subject or time reference. 'Be recorded' is therefore the correct form here.

Question 30English Language and Verbal Reasoning

Which option gives the pair of words that correctly completes this sentence? 'The cadet was ___ to discover that the ___ of the cargo had been miscalculated, and he reported it at once.'

  1. apprehension / weigh
  2. apprehensive / weight Correct answer.
  3. apprehensive / wait
  4. apprehended / weight

Explanation

The first gap needs an adjective describing the cadet's feeling, and 'apprehensive' fits, while the second gap needs a noun for the mass of the cargo, which is 'weight'. The pair therefore matches both grammar and shipping vocabulary.

Question 31English Language and Verbal Reasoning

Read this notice: 'All cadets must submit their sea-service testimonials to the training office by 17:00 on Friday. Late submissions will be accepted only with the written approval of the head of department.' Which option states the condition under which a late testimonial may be accepted?

  1. The head of department gives written approval. Correct answer.
  2. The cadet submits it before the following Monday.
  3. The cadet has completed the required sea time.
  4. The training office grants an extension by telephone.

Explanation

The notice makes one exception explicit: late submissions are accepted only with the written approval of the head of department. The word 'only' restricts the exception, so no other route to acceptance is offered in the text.

Question 32English Language and Verbal Reasoning

A cadet's report contains the sentence: 'The officer told the cadet that he had entered the wrong berth number in the manifest.' Which revision removes the pronoun ambiguity most clearly?

  1. Telling the cadet, the officer said he had entered the wrong berth number in the manifest.
  2. The officer told the cadet that he had entered the wrong berth number in the manifest, which was wrong.
  3. The officer told him that he had entered the wrong berth number in the manifest.
  4. The officer told the cadet that the cadet had entered the wrong berth number in the manifest. Correct answer.

Explanation

The pronoun 'he' can refer to either the officer or the cadet, so the ambiguity is removed only by naming the person who made the error. Replacing the second 'he' with 'the cadet' makes the referent explicit and keeps the original meaning intact.

Question 33English Language and Verbal Reasoning

Which option correctly uses a colon in a formal ship's report?

  1. The inspection revealed three defects, namely: a cracked gauge, a loose railing, and a blocked drain.
  2. The inspection revealed three defects: a cracked gauge, a loose railing, and a blocked drain. Correct answer.
  3. The inspection revealed: three defects including a cracked gauge and a loose railing.
  4. The defects were: a cracked gauge, a loose railing, and a blocked drain, which the inspector noted.

Explanation

A colon may follow a complete independent clause and introduce a list or explanation that follows it. In option 0 the clause 'The inspection revealed three defects' is complete, and the colon correctly introduces the list of defects.

Question 34English Language and Verbal Reasoning

Read the passage: 'The investigation found that the grounding was caused not by equipment failure but by a breakdown in bridge communication. The watch officer had assumed the helmsman had received the course change, and neither man confirmed it aloud.' Which option best expresses the main finding?

  1. The helmsman deliberately ignored the course change.
  2. The watch officer was solely responsible because he gave the order.
  3. Poor confirmation of orders, rather than faulty machinery, caused the grounding. Correct answer.
  4. Equipment failure was the primary cause of the grounding.

Explanation

The passage uses the 'not by X but by Y' construction to place the cause on a breakdown in bridge communication, and the second sentence illustrates this as a failure to confirm the order aloud. The main finding is therefore a human communication failure rather than an equipment fault.

Question 35English Language and Verbal Reasoning

In the sentence 'The officer to whom the report was addressed signed it immediately', why is 'whom' used rather than 'who'?

  1. Because the relative clause is non-defining and set off by commas.
  2. Because it introduces a question rather than a relative clause.
  3. Because it is the subject of the verb 'signed'.
  4. Because it follows a preposition and acts as the object of 'to'. Correct answer.

Explanation

In formal English 'who' is the subject form and 'whom' is the object form. Here the pronoun is the object of the preposition 'to', so the objective form 'whom' is required.

Question 36English Language and Verbal Reasoning

A cadet writes: 'Neither the chief officer nor the deckhands was aware of the change in berth.' Which revision makes the verb agree correctly with the subject?

  1. Neither the chief officer nor the deckhands were aware of the change in berth. Correct answer.
  2. Neither the chief officer nor the deckhands be aware of the change in berth.
  3. Neither the chief officer nor the deckhands has been aware of the change in berth.
  4. Neither the chief officer nor the deckhands is aware of the change in berth.

Explanation

With 'neither ... nor', the verb agrees with the nearer subject. The nearer subject here is the plural 'deckhands', so the plural past form 'were' is correct.

Question 37English Language and Verbal Reasoning

In the sentence 'Having completed the stability calculation, the second officer submitted the loading plan', what does the opening phrase modify?

  1. The loading plan
  2. The act of submitting
  3. The stability calculation
  4. The second officer Correct answer.

Explanation

A participial phrase at the start of a sentence modifies the subject of the main clause. The subject here is 'the second officer', who completed the calculation before submitting the plan.

Question 38English Language and Verbal Reasoning

Which option gives the best antonym for 'hazardous' as used in the sentence 'The approach channel was hazardous after the storm'?

  1. Narrow
  2. Perilous
  3. Uncharted
  4. Safe Correct answer.

Explanation

'Hazardous' means dangerous or involving risk, so its antonym is a word meaning free from danger. 'Safe' is the direct opposite in this context.

Question 39English Language and Verbal Reasoning

Analyse this sentence: 'Only after the lifeboat drill had ended did the cadets realise how poorly they had performed.' Which option best describes the grammatical effect of beginning with 'Only after'?

  1. It requires the main verb to appear in the infinitive form.
  2. It makes the main clause a subordinate clause.
  3. It requires inversion of the auxiliary and subject in the main clause. Correct answer.
  4. It converts the sentence into a conditional statement.

Explanation

When a sentence opens with a restrictive adverbial such as 'only after', 'never', or 'seldom', standard formal English inverts the subject and auxiliary in the main clause, giving 'did the cadets realise'. The inversion is a marked word order, not a change of clause type.

Question 40English Language and Verbal Reasoning

A cadet writes: 'The vessel's list was ___, so the master ordered the ballast to be redistributed before departure.' Which word best fits the gap in this stability report?

  1. excessively
  2. exceeding
  3. excessive Correct answer.
  4. excess

Explanation

The gap follows the linking verb 'was' and must be filled by an adjective describing the list. 'Excessive' is the adjective meaning too great, which fits the report and explains the master's corrective order.

Question 41Mathematics and Numerical Reasoning

A cadet must plot a course from point A (0,0) to point B (12,16) on a chart grid measured in nautical miles. What is the straight-line distance between the two points?

  1. 18 nautical miles
  2. 28 nautical miles
  3. 20 nautical miles Correct answer.
  4. 14 nautical miles

Explanation

Apply the Pythagorean theorem to the coordinate differences: 12² + 16² = 144 + 256 = 400, and the square root of 400 is 20. The distance is therefore 20 nautical miles.

Question 42Mathematics and Numerical Reasoning

A ship's fuel consumption is 45 litres per hour at a steady speed of 15 knots. How many litres are consumed on a 6-hour passage at that speed?

  1. 300 litres
  2. 270 litres Correct answer.
  3. 180 litres
  4. 255 litres

Explanation

Consumption scales directly with time at a fixed rate, so multiply 45 litres per hour by 6 hours. This gives 270 litres for the passage.

Question 43Mathematics and Numerical Reasoning

A bearing is measured clockwise from north. A lookout reports a contact at 135 degrees. In which quadrant of the compass does this bearing fall?

  1. South-east Correct answer.
  2. North-east
  3. South-west
  4. North-west

Explanation

Bearings increase clockwise from north, so 90 degrees is east and 180 degrees is south. A bearing of 135 degrees lies between east and south, which is the south-east quadrant.

Question 44Mathematics and Numerical Reasoning

Convert a speed of 18 knots to metres per second, given that 1 knot equals 0.514 metres per second.

  1. 10.80 m/s
  2. 9.25 m/s Correct answer.
  3. 35.02 m/s
  4. 8.60 m/s

Explanation

Multiply the speed in knots by the conversion factor: 18 × 0.514 = 9.252, which rounds to 9.25 metres per second.

Question 45Mathematics and Numerical Reasoning

A watchkeeper records tide heights of 2.4 m, 2.8 m, 3.1 m and 2.5 m at four consecutive hours. What is the mean tide height?

  1. 2.70 m Correct answer.
  2. 2.65 m
  3. 2.80 m
  4. 2.75 m

Explanation

Add the four readings to get 10.8 m, then divide by the number of readings, 4. The mean is 2.70 m.

Question 46Mathematics and Numerical Reasoning

A cadet is told that 3/8 of a fuel tank's capacity has been used, leaving 250 litres. What is the full capacity of the tank?

  1. 400 litres Correct answer.
  2. 667 litres
  3. 625 litres
  4. 750 litres

Explanation

If 3/8 has been used, then 5/8 remains and equals 250 litres. Dividing 250 by 5 gives 50 litres per eighth, and multiplying by 8 gives a capacity of 400 litres.

Question 47Mathematics and Numerical Reasoning

A vessel steams due east for 40 nautical miles and then due north for 30 nautical miles. What is the bearing of its final position from the starting point, to the nearest degree?

  1. 127 degrees
  2. 053 degrees
  3. 037 degrees Correct answer.
  4. 323 degrees

Explanation

The eastward and northward legs form a right triangle, so the bearing angle east of north is the arctangent of 40/30, which is about 53 degrees. That places the final bearing at roughly 037 degrees clockwise from north.

Question 48Mathematics and Numerical Reasoning

A ship covers 84 nautical miles in 3 hours 30 minutes. What is its average speed in knots?

  1. 24 knots Correct answer.
  2. 21 knots
  3. 28 knots
  4. 26 knots

Explanation

Convert the time to hours: 3 hours 30 minutes is 3.5 hours. Dividing 84 nautical miles by 3.5 hours gives 24 knots.

Question 49Mathematics and Numerical Reasoning

On a chart with a scale of 1:50 000, a measured distance of 6.4 cm represents what distance on the water?

  1. 3.2 km Correct answer.
  2. 6.4 km
  3. 32 km
  4. 0.32 km

Explanation

A scale of 1:50 000 means 1 cm on the chart represents 50 000 cm, or 0.5 km, on the water. Multiplying 6.4 cm by 0.5 km per cm gives 3.2 km.

Question 50Mathematics and Numerical Reasoning

A cadet's navigation marks in four assessments are 62, 74, 81 and 71. A pass requires a mean of at least 70. What is the mean mark, and does the cadet pass?

  1. 70, pass
  2. 69, fail
  3. 71, pass
  4. 72, pass Correct answer.

Explanation

The four marks total 288, and dividing by 4 gives a mean of 72. Since 72 is at least 70, the cadet passes.