NECO PHYSICS ESSAY AND OBJECTIVE ANSWERS
(i) A multimeter
(ii) Reads if there is short circuit in the electric circuit
(i)A simple microscope uses one lens while a compound microscope uses two lens
(ii)A compound microscope produces a higher magnification than that of simple microscope
Using M= ZIt
I = M/Zt
I = 450/3.30*10-⁴ *25*60
I = 909A
Range (R) is defined as the horizontal distance from the point of Ohio aprojection to the point where the projectile hits the projection plane again
Time of flight: T= 2usinθ/g
sinθ = Tg/2u = 1.5*10/2*12
sinθ = 15/24 = 0.625
θ = sin-¹(0.625)
θ = 38.7°
(ii)A moving car
mgh = mc∆θ
∆θ = gh/c = 10*108/4200
= 0.257°C or 0.257K
A stationary wave is produced by a superposition of two waves of the frequency and amplitude which are exactly out of phase with each other
Wavelength = 4/2.5 = 1.6m
Vaporization is the conversion of a substance from the liquid or solid phase into the gaseous (vapour) phase.
(ii) No change
Lost Volt refers to the amount of energy lost (in a battery, generally) to energy resistance of components. It is generally fairly negligible, but to calculate: V=IR
where I is the current and R is resistance.
(i) Secondary cell last long and can be used over again and again.
(ii) A secondary cell is rechargeable meaning that the chemical reactions taking place in the cell are reversible and can be carried out in the opposite direction to charge the cell again.
Zamgist.com.ng Section B.