OC Mock Test 1 — Thinking Skills (Year 4) — Free Online Practice Test

A free NSW Opportunity Class (OC) placement test practice paper for Year 4 in the format of the real test: 30 questions in 30 minutes, covering Section A — Critical thinking; Section B — Problem solving. 30 minutes — about one minute per question. Choose the best answer. Answer every question — there is no penalty for a wrong answer. Attempt it online — every question is marked instantly and the correct answers are shown at the end.

NSW OCYear 430 questions30 marks30 minutesOnline, marked instantlyFREE

Section A — Critical thinking

Q1. Coach Ellis said: 'Our netball team lost on Saturday because the players were tired. Most of them had swum in the school swimming carnival on Friday.'
Which statement, if true, most strengthens Coach Ellis's argument?

The team has won most of its games so far this season.

The two players who missed the carnival played well, but the others made far more mistakes than usual.

The other team had practised twice as often as usual that week.

Saturday's game was played on an outdoor court in the sunshine.

Q2. Priya put one bean plant on the sunny classroom windowsill and another in a dark cupboard. After two weeks the windowsill plant was much bigger and healthier. Priya said, 'This proves that plants grow better when they get sunlight.'
Which statement, if true, most weakens Priya's argument?

Both plants were grown from beans out of the same packet.

Priya checked both plants at the same time each day.

Many gardeners put young plants in sunny spots.

The windowsill plant was watered every day, but the cupboard plant was watered only once.

Q3. Jack said: 'I will be going on the zoo excursion, because I have handed in my permission note.'
Which assumption does Jack's argument depend on?

Everyone who hands in a permission note is allowed to go on the excursion.

Most students in Jack's class have handed in their notes.

The zoo excursion is on a school day.

Jack has been to the zoo before.

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Q4. Everyone in the chess club is also in the maths club. Some members of the maths club play the violin. Leo is in the chess club.
If these statements are true, which of the following must also be true?

Leo plays the violin.

Everyone in the maths club is in the chess club.

Leo is in the maths club.

Some members of the chess club play the violin.

Q5. Ava said: 'All the dogs at the park today were on leads. My neighbour's dog, Rex, is on a lead, so Rex must be at the park today.'
Which statement shows the mistake in Ava's reasoning?

Rex could be on a lead somewhere other than the park.

Rex might not like going to the park.

Some dogs at the park may have been off their leads.

Ava's neighbour might own more than one dog.

Q6. Ms Rossi told her class: 'Everyone who gets 10 out of 10 in Friday's spelling test will get a gold sticker.'
Mia said: 'Tom got a gold sticker, so he must have got 10 out of 10.'
Sam said: 'Lily got 8 out of 10, so she cannot have got a gold sticker.'
If what Ms Rossi said is true, whose reasoning is correct?

Mia only

Sam only

Both Mia and Sam

Neither Mia nor Sam

Q7. The rule at the pool is: 'Only children who can swim 50 metres may use the deep end.' Everyone at the pool follows the rule.
Noah said: 'Ella is in the deep end, so she can swim 50 metres.'
Zara said: 'Ben can swim 50 metres, so he must be in the deep end.'
Whose reasoning is correct?

Noah only

Zara only

Both Noah and Zara

Neither Noah nor Zara

Q8. Mr Patel noticed that on days when his class has sport in the morning, much less food is left in the students' lunchboxes than on days with no sport.
Which conclusion is best supported by this information?

Sport makes every child hungry.

Mr Patel's students tend to eat more of their lunch on sport days.

Mr Patel's class should have sport every day.

The students do not like the food packed on days without sport.

Q9. Olivia said: 'The new crossing supervisor has made the road outside our school safer. Since she started this term, no near-misses have been reported at the crossing.'
Which statement, if true, most strengthens Olivia's argument?

The crossing supervisor wears a bright orange vest and carries a stop sign.

The speed limit outside the school was lowered at the start of this term.

Some families have started driving their children to school this term.

Last term, before the supervisor started, six near-misses were reported at the crossing.

Q10. Harry said: 'Our class should go to the zoo instead of the museum for our excursion. The zoo is closer to our school, so we will spend less time on the bus.'
Which statement, if true, most weakens Harry's argument?

Because of roadworks, the bus trip to the zoo will take longer than the trip to the museum.

Most students in the class have already visited the museum.

The zoo has a large picnic area where the class can eat lunch.

The bus that takes the class can carry up to 50 people.

Q11. Chloe said: 'I will get to school before the bell rings, because I am catching the 8:15 bus.'
Which assumption does Chloe's argument depend on?

The 8:15 bus is usually very crowded.

Chloe's friends also catch the 8:15 bus.

The bell rings at nine o'clock every day.

The 8:15 bus gets to school before the bell rings.

Q12. The school rule is: 'The Year 4 picnic will be held outside only if the weather forecast is fine.'
Ruby said: 'The forecast is fine, so the picnic will definitely be held outside.'
Which statement shows the mistake in Ruby's reasoning?

Ruby has not checked what food people are bringing.

A fine forecast is needed for an outside picnic, but it does not make an outside picnic certain.

If the forecast were not fine, the picnic could still be held outside.

The rule is only for the students in Year 4.

Q13. At the swimming carnival, Kai swam faster than Jess, and Jess swam faster than Omar. Lucy also swam faster than Omar.
Which of these must be true?

Kai swam faster than Omar.

Lucy swam faster than Jess.

Kai swam faster than Lucy.

Jess swam faster than Lucy.

Q14. Every student in the school choir is in Year 4 or Year 5. This year there are no Year 5 students in the choir.
Isla said: 'So every student in the choir is in Year 4.'
Ethan said: 'So if Max is in Year 5, he is not in the choir.'
Whose reasoning is correct?

Isla only

Ethan only

Both Isla and Ethan

Neither Isla nor Ethan

Section B — Problem solving

Q15. In a secret code, each letter is replaced by the letter two places after it in the alphabet. For example, BOOK is written as DQQM.
Which word is written as UEJQQN?

SCROLL

SCHOOL

SCHEME

SCOOPS

Q16. What number comes next in this pattern?
2, 5, 11, 23, 47, ?

141

Q17. Which of these nets can be folded to make a cube?

Q18. Five friends — Ada, Ben, Cara, Dev and Eli — are standing in a line at the canteen.
Dev is third in line.
Eli is directly behind Ada.
Cara is somewhere in front of Ben.
Ada is not at the front of the line.
Who is second in line?

Ben

Cara

Ada

Eli

Q19. 3 April is a Monday. Mia's birthday is exactly 40 days later.
On which day of the week is Mia's birthday?

Saturday

Friday

Sunday

Wednesday

Q20. The pattern is reflected in the dotted mirror line. Which picture shows its reflection?

Q21. A vase in the art room was broken at lunchtime. Amy, Ben and Cal were nearby, and one of them broke it.
Amy said: 'Ben broke it.'
Ben said: 'I did not break it.'
Cal said: 'I did not break it.'
Only one of the three children is telling the truth. Who broke the vase?

Amy

Cal

Ben

It cannot be worked out

Q22. Matchsticks are used to make a row of squares, as shown.
How many matchsticks are needed to make a row of 15 squares?

Q23. On a balance, 2 apples weigh the same as 3 bananas.
1 apple and 1 banana together weigh the same as 10 pears.
All apples weigh the same, all bananas weigh the same and all pears weigh the same.
How many pears weigh the same as 1 apple?

Q24. This solid is built from identical cubes in the corner of a floor. Every cube rests either on the floor or on another cube.
How many cubes are there altogether?

Q25. Six friends sit around a round table with six equally spaced seats.
Ana sits directly opposite Bo.
Cy sits next to Ana.
Di sits next to Bo.
Ed does not sit next to Cy.
Flo sits directly opposite Cy.
Who sits directly opposite Di?

Flo

Ana

Q26. The tile is given a quarter turn clockwise. Which picture shows the tile after the turn?

Q27. A film started at 10:45 am and lasted 1 hour 50 minutes. After a 15-minute break, a second film lasting 95 minutes began.
At what time did the second film finish?

1:25 pm

2:10 pm

2:25 pm

2:40 pm

Q28. A square piece of paper is folded twice and then a hole is punched, as shown. The paper is then unfolded.
Which picture shows the unfolded paper?

Q29. Jai, Kiara and Liam each own one pet (a dog, a cat or a fish) and each play one sport (soccer, tennis or swimming). No two children have the same pet or the same sport.
The child who owns the dog plays soccer.
Kiara does not own the dog, and she does not swim.
Jai does not play soccer and does not own the cat.
Who owns the fish, and what sport does that child play?

Liam, swimming

Jai, swimming

Kiara, tennis

Jai, tennis

Q30. The diagram is a view from above of a model built with cubes. Each number shows how many cubes are in that stack.
Which picture shows the model when it is viewed from the front?

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