GCSE COMBINED SCIENCE HIGHER: PHYSICS 2018 PAPER 1

Notes:

Questions 1.2  positive charge comes from the protons.

Every atom of the element has the same number of protons.

so same total positive charge

1.3 ( 300,000,00/100) x 7 = 21,000,000

answer : 21,000,00 m/s

1.4  6 x 2.5 x 10 to the power of -11 = 1.5 x 10 to the power of - 10

answer = 1.5 x 10 to the power of - 10

Question 2.1

1. Place the stone on the top pan balance and measure its mass.
2. Fill the displacement can until the water is level with the bottom of the pipe.
3. Place a measuring cylinder under the pipe ready to collect the displaced water.
4. Carefully drop the stone into the can and wait until no more water runs into the cylinder.
5. Measure the volume of the displaced water.
6. Use the measurements to calculate the density of the stone.

2.2 watch a yt video

2.3 Uncertainty =  1/2 x range

uncertainty = 1/2 x ( 1120 - 960)

uncertainty = 1/2 x 160

answer: 80

Question 3)

3.1 they move in random directions.

they move at a range of different speeds.

3.2 the speed of the particles would increase

3.3 if the temperature increases, the pressure would also increase, so it could explode.

3.4   0.1

3.5   p = 2.25 x 0.25

p = 0.56

answer: 27

3.6  the volume of air increases

Question 4)

4.1    2 charged particles and 2 neutral particles

4.2    it is the type of radiation with a negative charge

4.3      it has a very long range in air

4.4  The risk associated with Caesium hasn't decreased by much as Caesium has a long life.

The risk associated with Iondine has decreased by a large amount as iodine has a small half life.

4.5     5 x 30 = 150

150 +  1986 = 2136

answer: 2136

Question 5)

5.1    The wall has two layers.

cavity wall insulation has low thermal conductivity 

so less energy is transferred by conduction. 

5.2    T =  20.8 - 17.4 / 2

answer: 19.1

5.3 

Chemical energy store of the fuel decreases

thermal energy store of the water increases

 thermal energy store of the air increases

5.4

E = 15 000 000  (J)

T =  600 (s)

p  = 15 000 000 / 600

p =  25 000 (w)

answer: 25 000

Question 6)

6.1  watch a yt video

6.2      i to the power of 1  =  i to the power of 2 + i to the power of 3

i to the power of 2 =  i to the power of 3

6.3   p = i to the power of  2   x   12

3 = i to the power of 2  x 12

i = square root (  3 /12)

i = 0.5

Q = 0.5 x 60 = 30

Q total = 60

answer: 60

6.4

my answer: