Physics Exam June 2023

Question 1

Transformer X causes potential difference to_____________

Causes current to ___________

Answer 1

Increase

Decrease

Question 2

Which equation links I, P and R

Answer 2

P = I^2 R

Question 3

1.60 x 10^9

2000A

Calculate resistance

Answer 3

1.60 x 10^9 = 2000^2 x R

R = 1.60 x 10^9 ➗ 2000^2

R = 400

Question 4

Which equation links efficiency, total energy input and useful energy output

Answer 4

Efficiency = useful ouput energy transfer ➗ total input energy transfer

Question 5

34.2 Gj

0.992

Calculate Useful energy output

Answer 5

0.992 = useful energy output ➗ 34.2

Useful energy output = 0.992 x 34.2

= 33.9

Question 6

Why did student leave thermometer in iron block for few minutes before recording the initial temperature

Answer 6

So thermometer temperature was same as temperature of iron block

Question 7

What effect will adding insulation have on investigation

Answer 7

The calculated specific heat capacity will be more accurate

The iron block will transfer thermal energy to surroundings at a lower rate

Question 8

Direct potential difference

Answer 8

Polarity of the potential difference doesn’t charge

Question 9

Which equation linos Q, E and V

Answer 9

E = QV

Question 10

Explain the changes in the arrangement and movement of the particles as the ice melted and the temperature increased to 5°C

Answer 10

Particles in solid in regular pattern - liquid random

Particles in solid vibrate - liquid move freely

As ice changes to water temp remains constant as ice ice changes to water potential energy increases

As water warms particles move faster

Internal energy is total kinetic and potential energy of particles

Question 11

Explain why solar power system improves the reliability of the electric supply to the village

Answer 11

Reduces dependance on main grid

Solar Panels provide continuous source

Question 12

Describe difference between irradiation and contamination

Answer 12

Irradiation is exposure of person to radiation

Contamination is prescence of radioactive material on person

Question 13

Calculate number of days for nuclear power station to recieve same dose as a pilot flying for 24 hours

Answer 13

24 hours = 0.072

Number of days = 0.072 ➗ 0.00050

144

Question 14

Power output for lamp is 1.0W

Potential difference is 5.0V

A student predicts that if power output would be 4.0W if potential differencd was doubled

Answer 14

p. d. would need to double

As Resistance of filament lamp increases

Question 15

Suggest why the baby bouncer should not be used with babies with mass greater than 12kg

Answer 15

Spring may be permanently extended

Question 16

Describe energy transfers as the baby moves from position A to position B

Answer 16

Baby has gravitational potential energy

As baby moves down is transferred to kinetic energy then elastic potential energy

All energy is elastic potential energy

Question 17

What year was this discovered

Electron

Answer 17

1897

Question 18

What year was this discovered

Neutron

Answer 18

1932

Question 19

What year was this discovered

Nucleus

Answer 19

1911

Question 20

What year was this discovered

Proton

Answer 20

1920

Question 21

Why alpha particle A takes path shown figure 8

Answer 21

Both alpha and nucleus have positive charge

So alpha particle and gold nucleus repel each other

Question 22

Explain why path of alpha particle B is more tightly curved than the path of alpha particle C

Answer 22

Particle B passes closer to he nucleus

So experiences stronger force

Question 23

What can be deduced about atom from paths taken by alpha particles D, E, F and G

Answer 23

The atom is mostly empty space

Question 24

How is the bohr model of the atom different from the nucelar model of atom

Answer 24

In bohr model electrons orbit nucleus at specific distances

Question 25

How an electron can move up and down between energy levels in an atom

Answer 25

Electron absorbs energy from electromagnetic radiation to move to higher level

To move to lower level electron emits energy in form of electromagnetic radiation

Question 26

Why pressure increases as more air is pumped into the tyre

Answer 26

More particles

Greater number of collisions with tyre per second

Question 27

Why air pressure in car tyre changes if temperature of air in tyre increases

Answer 27

As temp increase, air particles have greater kinetic energy

More collisions with tyre per second

Greater force in each collision

Greater force per square meter causes greater pressure