ཚན་རིགScienceKids, ages 11 to 14English

Light, sound and electricity

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Questions

1Multiple choice · 20 s · 10 ptsNot played yet
Why does a shadow form behind an object that light cannot pass through?
- ALight bends around the object
- BThe object gives out darkness
- CSound waves are blocked
- DLight travels in straight lines
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2Multiple choice · 20 s · 10 ptsNot played yet
What is it called when light bounces off a surface such as a mirror?
- AReflection
- BRefraction
- CAbsorption
- DDispersion
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3Multiple choice · 20 s · 10 ptsNot played yet
Why does the straw in the glass of water in the picture look bent?
- ALight bends between water and air
- BThe water really bends the straw
- CLight reflects off the glass
- DThe straw softens in water
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4Multiple choice · 20 s · 10 ptsNot played yet
The glass prism in the picture splits white light into a band of colours. What is this band called?
- AA shadow
- BA spectrum
- CAn echo
- DA reflection
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5Multiple choice · 20 s · 10 ptsNot played yet
How many main colours are usually named in a rainbow?
- AThree
- BFive
- CSeven
- DTen
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6True or false · 20 s · 10 ptsNot played yet
The Moon makes its own light, like the Sun.
- ✓True · བདེན།
- ✕False · རྫུན།
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7Multiple choice · 20 s · 10 ptsNot played yet
During a thunderstorm, why do you usually see the lightning before you hear the thunder?
- ASound travels faster than light
- BLight travels much faster than sound
- CThunder is made after lightning ends
- DEyes react faster than ears
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8True or false · 20 s · 10 ptsNot played yet
Sound can travel through the empty space between planets.
- ✓True · བདེན།
- ✕False · རྫུན།
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9Multiple choice · 20 s · 10 ptsNot played yet
Through which of these does sound travel fastest?
- AAir
- BWater
- CSteel
- DA vacuum
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10True or false · 20 s · 10 ptsNot played yet
All sounds are made by something vibrating.
- ✓True · བདེན།
- ✕False · རྫུན།
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11Multiple choice · 20 s · 10 ptsNot played yet
A whistle makes a high-pitched sound. What does a high-pitched sound have?
- AA low frequency
- BA high frequency
- CA large amplitude
- DA slow speed
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12Multiple choice · 20 s · 10 ptsNot played yet
Which unit is used to measure how loud a sound is?
- ADecibels (dB)
- BHertz (Hz)
- CWatts (W)
- DNewtons (N)
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13Multiple choice · 20 s · 10 ptsNot played yet
Which of these materials is a good conductor of electricity?
- APlastic
- BRubber
- CGlass
- DCopper
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14Multiple choice · 20 s · 10 ptsNot played yet
Why are the copper wires in the electric cable in the picture covered in plastic?
- APlastic is an insulator
- BPlastic helps current flow faster
- CPlastic makes the wires magnetic
- DPlastic stores the electricity
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15True or false · 20 s · 10 ptsNot played yet
Electric current can only flow when a circuit is complete, with no gaps.
- ✓True · བདེན།
- ✕False · རྫུན།
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16Multiple choice · 20 s · 10 ptsNot played yet
Two bulbs are connected in a series circuit. What happens if one bulb breaks?
- AThe other bulb gets brighter
- BThe other bulb stays the same
- CThe other bulb goes out too
- DThe battery recharges itself
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17Multiple choice · 20 s · 10 ptsNot played yet
Which part of a circuit provides the energy that pushes the current around?
- AThe bulb
- BThe cell or battery
- CThe switch
- DThe wire
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18Multiple choice · 20 s · 10 ptsNot played yet
The machines in the picture make electricity. Which energy source do they use?
- ASunlight
- BCoal
- CWind
- DNatural gas
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19Multiple choice · 20 s · 10 ptsNot played yet
The dam in the picture makes electricity from flowing water. What is this kind of power called?
- ASolar power
- BWind power
- CNuclear power
- DHydroelectric power
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20Multiple choice · 20 s · 10 ptsNot played yet
Which of these energy sources is renewable?
- ACoal
- BOil
- CNatural gas
- DSolar energy
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