Energy Quiz - By Holly Szasz | Take the Quiz

Which one of these is NOT an example of change in the way energy is stored in a system?

Putting a hot plate on a table therefore heating a plate up

Somebody switching a radiator on therefore heating the room up

Cooking something therefore everything heating up

Playing on a computer

What are the three different ways that thermal energy can be transferred in a system?

Waves, transferral and passing along

Convection, conduction and radiation.

Transferral, conduction and partical chains

Sound, Heat and Light

How much Kinetic Energy does a person of mass 60 kg running at 3m/s have if Ek=1/2mv²?

1/2x60x3² = 270 W

60x3² = 540

1/2x60x3² = 270 J

1/2x3x60² = 5400

What is the Elastic Potential stored in a spring that is stretched 2m and the constant is 6 n/m and Ee=1/2ke2?

6x2²= 24

½x2x6²= 36 J

½x2x6²= 12 W

½x6x2²= 12 J

How much gravitational potential does a book with a mass of 0.5 kg lifted 1.5m onto a book shelf (assuming gravitational potential is normal and rounded to the nearest whole number)?

Gravity to the nearest whole = 9, 0.5x1.5x9= 6.25

Gravity to the nearest whole = 10, 0.5x1.5x10= 7.5 J

Gravity to the nearest whole = 9, 9/0.5x1.5= 12

Gravity to the nearest whole = 10, 10/0.5x1.5= 13.333

What is the change in energy of 1l of water going from 2c to 6c if water has a specific heat capacity of 4181 J/kg?

1x4181x4=16724 J

4181/4x1=1045.25 J

4181x1=4181 J

The mass of the object is unknown therefore no answer can be calculated

What does ‘specific heat capacity’ mean?

The amount of heat something can hold

How hot a fire can get

The amount of heat required to change the state of something

The heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree)

What is power (in relation to science)?

What superheros have

The ability to do something well

The rate at which energy is transferred or the rate which work is done.

The amount of energy that something has

What is a watt? (What?)

A watt is an energy transfer of 1 joule per second.

What?

A watt is a measurement of energy

A watt is A small bug

How much power does a lamp need if it transforms 1000 J in 10 s ?

1000/10 = 100 W

1000/10 = 100 J

1000x10 = 10000 W

1000x10 = 10000 J

How much power does a Toaster need if it has done 10 J of work over 20 s ?

10/20 = 0.5 J

20/10 = 2 J

10x20 = 200 J

10/20 = 0.5 W

Two lamps give of 10J of light energy but the first over 20 seconds and the other over 40, what can be said about the power output?

The have the same power output because they both produce 10J of energy.

The first lamp has a higher power outage because 10/20 is bigger than 10/40.

The second one is more efficient.

Nothing can be said, more information is needed.

Which one is always true about any energy type?

It travels at the speed of light

It contains big particles and little particles which send messages to each other

It is always hot

It cannot be created or destroyed only transferred (or stored or dissipated).

If a lamp that is NOT 100% efficient gives off energy, what can be said about it?

All of it's energy is useful

Some energy is usefully transferred as heat and the rest is wasted.

Some energy is usefully transferred as light and the rest is wasted.

More information is needed

What is the relationship between thermal conductivity and thermal energy transferred?

The lower the thermal conductivity the more thermal energy gets transferred.

The higher the thermal conductivity the more thermal energy gets transferred.

The lower the thermal conductivity the less light energy gets transferred.

There is no relationship, it varies continuously

How does the thickness and thermal conductivity of the walls effect the cooling rate of a building?

When the walls are thicker then the inside temperature takes longer to equalise with the outside temperature and it’s the same when the conductivity is lower.

When the walls are thinner then the inside temperature takes longer to equalise with the outside temperature and it’s the same when the conductivity is lower.

When the walls are thicker then the inside temperature takes less time to equalise with the outside temperature and it’s the same when the conductivity is lower.

There is no one effect, it varies continuously

What is the efficiency of a light bulb which produced 20 J of light and 30J of heat energy?

30/30+20 x100 = 60%

20/20+30 x100 = 40%

20/20+30 x100 = 20%

30/30+20 x100 = 60 J

Which one of these increases efficiency?

Using a silver bin instead if a black bin

Using electrical insulators for light bulbs

Choosing a better light for a fridge

Choosing a better thermal conductor for a frying pan.

Why are fossil fuels more reliable than wind energy?

Fossil fuels are reliable and wind is less reliable

If you have a fossil fuel it might have trouble burning and not produce fuel but there is wind and you can predict it and therefore you can always get energy.

If you have a fossil fuel it will work and produce fuel but sometimes there is no wind and you can’t predict it exactly and therefore you can’t get energy sometimes.

You can use bananas as fossil fuels

Why do we use fossil fuels instead of renewable energy sources?

It is because fossil fuels contain more energy and are more reliable.

We have too much fossil fuel which we need to use

Fossil fuel is better for the environment

We don't, we use wind energy

Why would some people prefer to use solar power over wind power?

Solar power is more renewable than wind

Solar power is more widely approved than wind

Wind power has loads more negative effects than solar

Some people consider wind turbines to be ugly and can harm nearby birds and solar power only requires harmless panels usually only taking up roof space on house.

Fill in the blanks in the right order (one is repeated)

Nuclear, Fossil, Nuclear, Wave

Electric, Fossil, Oil, Electric

Fossil Fuel, Electric, Nuclear, Fossil

Nuclear, Fossil, Wind Up Torch, Nuclear

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