Mock Test

Question 1

What is Newton’s first law of motion?

Answer 1

A body will remain at rest or move with uniform motion(equilibrium) unless acted on by a resultant force

Question 2

What is Newton’s second law?

Answer 2

F=MA

Question 3

What is Newton’s third law?

Answer 3

If object A exerts a force on object B, object B will exert and equal force on object A in the opposite direction

Question 4

What is the definition of force?

Answer 4

Force is the rate of change of momentum

Question 5

What is the principle of moments?

Answer 5

For a body in equilibrium, the total clockwise moment is equal to the total anti-clockwise moment

Question 6

What factors affect the extension of a cylindrical object under a tensile force?

Answer 6

Force (Force increases, change in length increases)
Material(YM increases, length decreases)
Cross sectional area(A increases, change in length decreases)
Natural Length

Question 7

What is Hookes law?

Answer 7

The extension is proportional to the force applied, up to the limit of proportionality

Question 8

What is Hookes law formula?

Answer 8

F=KL

Question 9

What is the formula for Elastic potential energy?

Answer 9

1/2 FL or 1/2 KL^2

Question 10

Formula for spring constant in series

Answer 10

1/K total = 1/K1 + 1/K2

Question 11

Formula for spring constant in parallel

Answer 11

Ktotal =K1 + K2

Question 12

What is plastic deformation?

Answer 12

When it doesn’t return to its original length

Question 13

What is the equation for stress?

Answer 13

Force/Area = Pascals

Question 14

What is the equation for strain?

Answer 14

Extension/original length

Question 15

What is the equation of the young’s modulus?

Answer 15

stress/strain= pascals

Question 16

Formula for number of electrons?

Answer 16

n=Q/e

Question 17

What is the shape of the VI graph of a carbon resistor/ ohmic conductor?

Answer 17

Y=X straight line thru origin

Question 18

Why does resistance increase when temperature increases?

Answer 18

There is an increase of lattice vibration so the electrons find it harder to flow through the metal. Therefore the resistance increases.

Question 19

What is important about a superconductor?

Answer 19

An electrical current can flow through it producing no heat, therefore, no power loss

Question 20

Where can a super conductor be used?

Answer 20

MRI Scanners

Hadron Collider

Question 21

What remains the same in a series circuit?

Answer 21

All components have the same current flowing through them

Question 22

What remains the same in a parallel circuit?

Answer 22

All components have the same potential difference

Question 23

What is the equation for R total and V total in a series circuit?

Answer 23

V total = V1 + V2

R total = V1+ V2

Question 24

What is the potential divider equation?

Answer 24

V1/Vt = R1/Rt

Question 25

What is the equation for I total and V total in a parallel circuit?

Answer 25

``` It = I1 +I2 1/Rt = 1/R1 + 1/R2 ```

Question 26

Small Internal resistance causes…?

Answer 26

Large current from supply Lost volts will be large PD across load will be a lot less than the emf

Question 27

What is Kirchoff’s first law?

Answer 27

The total current flowing into a point is equal to the current flowing out of the point

Question 28

What is Kirchoff’s second law?

Answer 28

The total emf provided by the supply must equal the pd across the components around a close loop.

Question 29

Low to high RI means?

Answer 29

towards normal

Question 30

High to low refractive index means?

Answer 30

Away from normal

Question 31

What conditions are required for total internal refraction?

Answer 31

- Refractive index of initial material must be greater than index of the material on the other side - Angle of incidence must be greater than the critical angle

Question 32

What are 4 advantages of using fibre optic cables?

Answer 32

- faster transmission of data - cheaper to produce - More energy efficient - No interference from mains

Question 33

What are the problems with optical fibres?

Answer 33

Absorption if the fibre isn’t perfectly transparent, signal gets weaker Dispersion causing pulse broadening so signals are disrupted

Question 34

What is monochromatic light?

Answer 34

Light with a single frequency and a single wavelength

Question 35

What are the properties of a coherent source?

Answer 35

Same frequency Same speed have a constant phase difference (constant phase difference)

Question 36

Describe why dark fringes can be seen in the Youngs double slit experiment?

Answer 36

2 coherent sources are creating an interference pattern. Dark fringes are observed when there is destructive interference. At this point, two waves have a phase difference of 180 and a path difference of a half a wavelength. This can be explained by the principle of superposition.

Question 37

Requirements for a stationary wave?

Answer 37

Same speed Opposite directions same frequency

Question 38

What is particle annihilation?

Answer 38

Particles-Antiparticle pair annihilate to produce two high energy photons

Question 39

What is pair production?

Answer 39

High energy photons produces particle-antiparticle pair