practice questions Flashcards

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1
Q

what is zero error

A

Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero

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2
Q

if batteries are inserted incorrect why dont they work

A

To get the voltage needed from multiple batteries, you need to put them in series. That is, you need the + from one battery connected to the - from the next battery, and so on.

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3
Q

why are gas power stations better than coal power stations

A

gas stations have 50 to 60 percent less greenhouse gas emmissions than carbon

gas power stations are much more reliable

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4
Q

what is a manmade cause of background radiation

A

x rays

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5
Q

one example of nuclear fuel

A

plutonium

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6
Q

what is nuclear fission

A

Nuclear fission is the splitting of a large atomic nucleus into smaller nuclei. In a nuclear reactor , a neutron is absorbed into a nucleus (typically uranium-235). This causes the nucleus to become uranium-236, which is violently unstable. The entire nucleus splits into two large fragments called ‘daughter nuclei ‘.

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7
Q

how does nuclear fission release energy

A

Fission is the splitting of heavy nuclei (such as uranium) – in two smaller nuclei. This process needs less energy to ‘bind’ them together – so energy is released.

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8
Q

what is an advantage of waste having a short halflife

A

If an isotope has a short half-life, it will decay quickly, and emit more particles in a given time than an isotope with a longer half-life. So isotopes with shorter half-lives have higher activity than those with longer half-lives.

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9
Q

6.3 explain terminal velocity

A

at the start, the object accelerates downwards due to the force of gravity

as the object’s speed increases, frictional forces such as air resistance or drag increase

at terminal velocity, the weight of the object due to gravity is balanced by the frictional forces, and the resultant force is zero

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10
Q

if more resistors are in a circuit why would the resistance be lower

A

In a parallel circuit, the net resistance decreases as more components are added, because there are more paths for the current to pass through.

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