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Past paper 1 June 2021

Terms in this set (17)

A substance is heated and changes directly from a solid to a gas. The substance __________
It sublimates
What is the advantage of transmitting electricity at a very high potential difference?
less thermal energy is transferred to the surroundings.
A student investigated the density of different fruits.

To determine the density of each fruit, the student measured the volume of each fruit.

Describe a method the student could have used to measure the volume of the lime
- Use a displacement can
- Fill the displacement can with water
- Fill the displacement can to the spout
- Place lime in the displacement can
- Collect water that overflows
- Use measuring cylinder to measure volume of water
When there were three lamps in the circuit the ammeter reading kept changing between 0.35 A and 0.36 A.

What type of error would this lead to?
Random error
Which of the following is the same for all atoms of the same element?

- Atomic number

- Mass number

- Neutron number
Atomic number
Which of the following is different for isotopes of the same element?

- Number of electrons

- Number of neutrons

- Number of protons
Number of neutrons
All radioactive elements have a half-life.

What is meant by 'half-life'?
the time it takes for the count rate of a sample to halve
Write down the equation which links efficiency, total power input and useful power output.
efficiency = useful power output / total power input
Write down the equation which links kinetic energy (Ek), mass (m) and speed (v)
kinetic energy = 0.5 × mass × speed2
The relationship between the pressure and volume of a gas is given by the equation:

pressure × volume = constant

Complete the sentence.

For this equation to apply, both the mass of gas and the __________ of the gas must stay the same.
For this equation to apply, both the mass of gas and the temperature of the gas must stay the same.
The charging station applies a direct potential difference across the battery of the car.

What does 'direct potential difference' mean?
the polarity does not change
Which equation links energy transferred (E), power (P) and time (t)?
energy transferred = power × time
Which equation links current (I), potential difference (V) and resistance (R)?
V = I × R
Nuclear fusion is the joining together of ______________

During nuclear fusion the total mass of the particles ___________
Nuclear fusion is the joining together of nuclei

During nuclear fusion the total mass of the particles decreases
The idea of obtaining power from nuclear fusion was investigated using models.

The models were tested before starting to build the first commercial nuclear fusion power station.

Suggest two reasons why models were tested.
- to develop an understanding of the process

- to assess environmental impact
Student B repeated the investigation.

During Student B's investigation the temperature of resistor R increased.

Explain how the increased temperature of resistor R would have affected Student B's results.
I-V graph would be curved because resistance would increase
The digital ammeter has a higher resolution than the moving coil ammeter.

Give one other reason why it would have been better to use the digital ammeter throughout this investigation.
- less chance of misreading
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