PHYSICS - Trial Paper Collection

papercollection5NO.MARKING CRITERIAMARKSUB TOTAL6(a) State the meaning correctly 1- Time for the activity of the radioactive substance to become halfof the original activity // Time taken for half of the mass ofradioactive substance to decay(b) (i) State the half life correctly- X : 10 minutes- Y : 5 minutes11(ii)State the answer correctly- X : 50 %- Y : 25 %11(c) State the comparison correctly 1- The decay rates for substance X is slower//vice versaState the relationship correctly 1- The shorter the half life, the higher the decay rate(d) Give the reason correctly 1- Background radiation 87(a) State the energy changes correctly 1- electrical energy to (gravitational) potential energy(b) (i) Correct substitution 1- 1.7 x 10Correct answer and correct unit- 17 W1(ii) Correct substitution 12x10x1.5-2.5Correct answer with correct unit- 12 W 1(iii) Correct substitution 112x100%17Correct answer with correct unit- 70.6 %1(c) State the change on the ammeter correctly 1- ammeter reading decreasesGive explanation correctly 1- less work done // less power required(d)Give one suggestion correctly- lubricate the moving parts to reduce friction 1 10