by Sunday | Nov 12 | Physics JAMB
A. V B. III C. I D. II Correct Answer: Option A – V Explanation Silicon is a tetravalent (4 valent) element, and in order to produce an n-type semi-conductor, it has to be dropped with a pentavalent (5valent)element, that, that is element in group five...
by Sunday | Nov 12 | Physics JAMB
A. increases then decrease B. increases C. decreases D. remains constant Correct Answer: Option B – increases Explanation When impurities are added to the semi-conductor, the semi-conductor is said to be doped and increases the conductivity of the...
by Sunday | Nov 12 | Physics JAMB
A. 250days B. 150days C. 300days D. 200days Correct Answer: Option A – 250days Explanation Since 1/32, is the fraction left of any radioactive material after 5half lives, that is: 1/32= (1/2)5. Thus if a half-life is 50 days, 5 half-lives will be 50 x 5= 250...
by Sunday | Nov 12 | Physics JAMB
A. 180° B. 90° C. 60° D. 30° Correct Answer: Option B – 90° Explanation In a purely capacity circuit, voltage lags behind current by 90° or current leads voltage by 90°
by Sunday | Nov 12 | Physics JAMB
A. 8 s B. 4 s C. 16 s D. 10 s Correct Answer: Option B – 4 s Explanation For a body projected at an angle θ to the horizontal, the time of the flight is given by T = (2u sin θ)/g =(2x 40)x sin (30)/10 =(2 x 40) x (0.5)/10 =...
by Sunday | Nov 12 | Physics JAMB
A. (R/r)² B. r/R C. (r/R)² D. R/r Correct Answer: Option D – R/r Explanation In a wheel and axle system of mechanic, the mechanical advantage is given by its ratio of the radius of the wheel R, to the radius of the axle r. that M.A =...
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