Physics WASSCE marking Scheme Part 1

Since WASSCE is over, we have put together the marking schemes of the subjects written starting with physics. this initiative is to help students in high school currently.

Check your WASSCE Results; Provisional Results for 2022 Out. GES withholds 8,486 Results

PART I

Base Unit of G- this question asks you to find the base unit of G using dimensional analysis proving your answer along the way.[G]= [R]³/[M].[T]²[G]= L³/MT²OR [G]=M^-1L³T^-2Base unit of G is kg^-1m³s^-2
Expression for strain, stress and modulus of elasticity- here, you are to write the expression for strain, stress and combine both to find young’s modulus.(a)strain=e/L(b)stress=F/A(c)Modulus of elasticity= F/A/e/L=Fl/Ae
Maximum height reached by the body- This is a projection question asking you to find the maximum height reached by a projected body. h= 20t-49/10t²compared to (1) h = ut-1/2gt²u=20 ms^-21/2g=49/10g=9.8m/s²hmax =u²/2ghmax=20²/2(9.8)hmax=20.4m
4.Angle of projection- still, your dynamics and projection knowledge is tested. you have to find the angle of projection of a body.
H=u²sin²ɵ/2g5.2= 20²sin²ɵ/2(10)sin²ɵ= (5.2*2*10/20²)^1/2ɵ=30.7°
Now on to the straight forward questions.
1. Industrial applications of magnets
They are used;
- to reset the index in maximum/minimum thermometers.
- as magnetic dust in doors of refrigerators/fridges/freezers.
- to pick up stray needles/pins/iron metals.
- to post notices on magnetic boards. in loudspeakers.
- to lift heavy magnetic materials.
- in Magnetic Resonance Imaging (MRI)
in ammeter/voltmeter
Characteristics of Laser lights:
- it is monochromatic consists of one colour/ wavelength
- it is coherent / all points are in phase
- it is collimated / all points travel in the same / specific direction
- intensity remains constant with distance