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HIA International — Grade 8

Unit 1: Photosynthesis and the carbon cycle

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Unit 2: Properties of materials

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Unit 3: Forces and energy

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Unit 4: Maintaining life

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Unit 5: Reactivity

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Unit 6: Sound and space

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Unit 7: Genes and inheritance

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Quiz

Checkpoint Grade 8 Unit 3 – 3.4 Tides

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Tides Checkpoint Earth and Space quiz set 2: free practice for Cambridge Checkpoint Earth And Space 0893. Work through this Tides Checkpoint Earth and Space quiz set 2 and get instant feedback on every answer. If you get stuck, review the 4.4 Tides lesson. More practice: Cambridge Checkpoint Earth And Space 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Which statement correctly describes earth tide?
a difference in gravitational pull that produces tides
a force that pulls objects toward one another
the difference between high-tide and low-tide levels
a small movement of the solid Earth caused by gravitational attraction
2.
Which statement correctly describes tidal force?
a small movement of the solid Earth caused by gravitational attraction
a force that pulls objects toward one another
the difference between high-tide and low-tide levels
a difference in gravitational pull that produces tides
3.
Which statement correctly describes force of attraction?
a small movement of the solid Earth caused by gravitational attraction
the difference between high-tide and low-tide levels
a force that pulls objects toward one another
a difference in gravitational pull that produces tides
4.
Which statement correctly describes tidal range?
a small movement of the solid Earth caused by gravitational attraction
a difference in gravitational pull that produces tides
a force that pulls objects toward one another
the difference between high-tide and low-tide levels
5.
Which of these is the FIRST step in the correct order?
a tidal force is produced
an earth tide forms
the tidal range is observed
a force of attraction acts
6.
Which step comes immediately after "a tidal force is produced"?
a force of attraction acts
the tidal range is observed
an earth tide forms
7.
Which practical work belongs to Tides?
Evaluate a model of Solar System formation and distinguish evidence from speculation
Use force diagrams and compare motion in air with motion in a vacuum
Measure or calculate weight using W = m × g and use correct units
Interpret tidal-range information and relate it to the positions of the Earth, Moon and Sun
8.
The graph shows the daily tidal range at a port for one month. There was a full moon on day 9. On about which day was the next new moon?
Dr Dabour Hub Academy - figure 1
About day 16
About day 2
About day 24
About day 30
9.
Four students drew how the Moon's gravity changes the shape of the oceans (blue). The drawings are not to scale. Which drawing is correct?
Dr Dabour Hub Academy - figure 2
Drawing A
Drawing B
Drawing C
Drawing D
10.
The map shows a coast with a long, funnel-shaped bay. The Moon's pull is the same at all four places P, Q, R and S. Which place is likely to have the largest tidal range?
Dr Dabour Hub Academy - figure 3
At place P
At place Q
At place R
At place S
11.
The graphs show the water level and the electrical power from a tidal power station that uses tidal currents over one day. Why is the output almost zero at about 03:00 and 09:00?
Dr Dabour Hub Academy - figure 4
The Moon's gravity switches off at those times
The turbines are turned off at night to save money
The water level is too high at both of those times
The water is barely moving at high and low tide
12.
To measure the tide, a class read the level of a float inside a pipe fixed to a harbour wall. Sea water can only enter through small holes near the bottom. Why is this a good method?
Dr Dabour Hub Academy - figure 5
Waves hardly change the level inside the pipe
The pipe blocks the Moon's gravity from the water inside
The water inside rises higher, so the tide looks bigger
The holes let the float leave the pipe at low tide
13.
Mo modelled a tidal turbine by placing a small water wheel attached to a generator in a channel and changing the speed of the water flow. The graph shows his results. Which is the best analysis?
Dr Dabour Hub Academy - figure 6
40 cm/s is anomalous; voltage does not depend on flow
60 cm/s is anomalous; faster flow gives a lower voltage
40 cm/s is anomalous; faster flow gives a higher voltage
10 cm/s is anomalous; faster flow gives a higher voltage
14.
On a sunny day Samira measured the temperature of a rock pool every 30 minutes, starting just after the falling tide left it cut off from the sea. When did the rising tide cover the pool again, and how can you tell?
Dr Dabour Hub Academy - figure 7
Between 10:00 and 10:30 – the pool began to warm up
Between 13:30 and 14:00 – it cooled suddenly to sea temperature
Between 12:00 and 12:30 – the Sun was at its highest point
Between 14:00 and 15:00 – the temperature hardly changed
15.
The table shows the tides at a fishing port on three days in a row. What is most likely to happen over the next few days?
Spring tides are coming, near a new or full moon
Neap tides are coming, near first or last quarter
The tidal range will stay at 3.5 m every day
The high tides will get lower as neap tides come
16.
Growth lines in fossil corals let scientists estimate how many days there were in a year long ago. The length of a year has hardly changed. Which conclusion is best supported by the data?
The year has been getting longer, so the orbit has slowed
The day has been getting shorter as the Earth spins faster
The day has been getting longer, as tidal friction predicts
The length of the day has always been 24 hours
17.
Farah surveyed barnacles on a rocky shore at different heights above the lowest tide. Which conclusion is best supported by her results?
More barnacles live higher up the shore
The tides have no link with where barnacles live
Barnacles must be out of water for 20 hours a day
More barnacles live where the sea covers them longer
18.
A class recorded the tidal range at their harbour on four dates, with the Moon's phase. One record is probably a mistake. Which one?
1 May – new moon should give a small range
23 May – last quarter should give a small range
15 May – full moon should give a small range
8 May – first quarter should give a large range
19.
The table shows the electricity generated each week by a tidal power station. Which is the best explanation of the pattern?
New and full moons give more light to the turbines
The Sun's gravity stops at first and last quarter
Neap tides have the largest range, so they give less
More water flows in and out at spring tides
20.
Hassan calculated the tidal range at four places. One of his ranges is wrong. Which row is wrong, and what is the correct range?
Beach – 2.7 m
Pier – 7.2 m
Estuary – 7.7 m
Harbour – 7.1 m
21.
A class wrote this risk assessment before studying rock pools. Which control measure is poor?
Slippery rocks – grippy shoes will not help
Rising tide – tide times cannot be known in advance
Large waves – standing near the edge adds risk
Sunburn – sun cream only works on cloudy days
22.
The Sun's effect on the tides is about half the Moon's. Roughly how does the tide-raising effect at spring tides compare with that at neap tides?
About 3 times as large
About 1.5 times as large
About twice as large
Exactly the same size
23.
Imagine the Earth had no Moon. Which prediction about the tides is best?
No tides at all, because only moons cause tides
Smaller tides from the Sun, the same size all month
Bigger tides, as nothing would cancel the Sun's pull
One high tide a year, when the Earth is nearest the Sun
24.
Ella wants to record the water level in a harbour for three days and nights. Why is a pressure sensor with a data logger better than reading a tide pole by hand?
It makes the tides larger and easier to measure
It only needs one reading each day to show the tides
It means she can use a different place each time
It takes readings day and night without gaps
25.
Kofi wants to test the idea that the tidal range depends on the phase of the Moon. Which plan is best?
Record the tide once at full moon and once at new moon only
Record high and low tide heights daily for a month or more, noting the Moon's phase
Record the tide on one day at ten different beaches
Record the tide every hour for one day and note the Moon's phase
26.
Nadia sees a full moon tonight. What kind of tides should she expect at the coast in about a week's time?
Spring tides, with a large range
No tides, as the Moon will be new
Neap tides, with a small range
Two spring tides on the same day
27.
Each option pairs something affected by tides with how it is affected. Which pairing is correct?
Tidal power – works only in calm weather
Large ships – prefer to enter harbours at low tide
Earth's day – getting shorter because of tides
Rock pools – cut off from the sea at low tide
28.
Each option pairs a tidal term with one of its features. Which pairing is correct?
Neap tide – high tides lower than usual
Spring tide – the smallest tidal range
Tidal bulge – water pulled towards the Sun only
Low tide – sea at its highest level
29.
Each option pairs a set of measurements from one harbour with a conclusion. Which pairing is correct?
Range 2.0 m, then 6.1 m a week later – spring, then neap
Range 6.1 m, then 2.0 m a week later – spring, then neap
Range 6.1 m on two days a week apart – spring, then neap
Range 2.0 m, then 2.1 m a week later – neap, then spring
30.
Each option pairs a time interval with what happens during it. Which pairing is correct?
About 24 hours – from high tide to low tide
About 50 minutes – from spring tide to neap tide
About 12 h 25 min – from one high tide to the next
About 29.5 days – from one spring tide to the next
31.
Which term is described as: a small movement of the solid Earth caused by gravitational attraction?
tidal force
force of attraction
tidal range
earth tide
32.
Which term is described as: a difference in gravitational pull that produces tides?
earth tide
tidal range
tidal force
force of attraction
33.
Which term is described as: a force that pulls objects toward one another?
earth tide
tidal range
force of attraction
tidal force
34.
Which term is described as: the difference between high-tide and low-tide levels?
earth tide
force of attraction
tidal range
tidal force
35.
At a port, high tide is at 22:50 on Friday. The first high tide on Saturday will be at about _____.
10:50 on Saturday
04:50 on Saturday
22:00 on Saturday
11:15 on Saturday
36.
Over millions of years, tidal _____ has slowly made each day on Earth longer.
friction
magnetism
radiation
evaporation
37.
At new moon the Moon is between the Earth and the Sun, so the tidal range is _____.
at its smallest
exactly zero metres
at its largest
the same as at neap
38.
To make her rock-pool temperatures comparable, Samira kept the thermometer at the same _____ each time.
time of the next high tide
depth in the pool
number of shells nearby
height above the pool
39.
At full moon the Sun and Moon are on opposite sides of the Earth, so their pulls cancel out and neap tides happen. True or false?
True – the statement is correct
True, and new moon also gives neap tides
False – they are in line, so spring tides happen
True, as the Sun then pulls the other way
40.
The two bulges of water stay roughly lined up with the Moon while the Earth rotates underneath them. True or false?
True – the statement is correct
False – the statement is wrong
False – the bulges stay fixed over one ocean
False – the bulges point towards the Sun
41.
The tidal range at a harbour is the same on every day of the month. True or false?
True – the statement is correct
False – it changes between spring and neap
True, as the Moon's pull never changes
True, unless the wind is blowing
42.
A line graph is a suitable way to show how the water level in a harbour changes with time over a day. True or false?
False – the statement is wrong
False – a bar chart must always be used
False – a pie chart is best for levels
True – the statement is correct
43.
Spring tides happen about twice a month, and so do neap tides. True or false?
False – the statement is wrong
True – the statement is correct
False – each happens once a year
False – spring tides happen daily
44.
Rashid reads a tide pole from the top of a harbour wall, looking down at an angle. His readings will be just as accurate as reading with his eye level with the water. True or false?
False – viewing at an angle causes errors
True – the statement is correct
True, as the scale is marked clearly
True, if he uses both eyes
45.
At neap tides, the Sun's pull raises some water where the Moon's pull gives low tide, so neap low tides are higher than usual. True or false?
False – the statement is wrong
False – neap low tides are the lowest of all
False – the Sun has no effect on low tides
True – the statement is correct
46.
Samira's friend measured the rock-pool temperature only at 11:00 and 14:00. Two readings are enough to show exactly when the pool stopped warming. True or false?
True – the statement is correct
True, as two points show any pattern
False – far more readings are needed
True, if the thermometer is accurate
47.
If the Earth rotated more slowly, so that a day lasted longer, the time between high tides at a coastal town would also be longer. True or false?
False – the statement is wrong
True – the statement is correct
False – it depends only on the Moon
False – it would become shorter
48.
During a total solar eclipse, the coasts of the Earth are likely to be having spring tides. True or false?
False – the statement is wrong
False – eclipses give neap tides
False – the Moon's shadow stops tides
True – the statement is correct
49.
In Mo's model turbine investigation, the speed of the water flow is the independent variable. True or false?
True – the statement is correct
False – the statement is wrong
False – the voltage is the independent one
False – the channel is the independent one
50.
Tidal power stations use water moving in and out with the tides to turn turbines and generate electricity. True or false?
False – the statement is wrong
False – they burn seaweed to make steam
True – the statement is correct
False – they only use waves from storms
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Part of Unit 3: Forces and energy — see every lesson and quiz in this unit.
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