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

1. 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/MT² OR [G]=M^-1L³T^-2Base unit of G is kg^-1m³s^-2
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
3. 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-49/10t²                    compared to (1) h = ut-1/2gt²u=20 ms^-2  1/2g=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.

4. H=u²sin²ɵ/2g5.2= 20²sin²ɵ/2(10)sin²ɵ= (5.2*2*10/20²)^1/2                    ɵ=30.7°
5. Now on to the straight forward questions.
   5. 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

6.   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

7. (a) Doping: The addition of impurities into the (lattice structure of) semiconductor

(b) Effect of donor impurities on semiconductor

• produce excess/additional electrons
• increase the electrical conductivity

Visit again for the part 2 of the WASSCE 2022 PHYSICS questions and answers…

If you don’t understand something, you can ask a friend or a facilitator in the comment section below this post….scroll Down

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