2021/20 NECO PHYSICS REAL,,,, RUNS,,,, EXPO,,, HELP,,,, LEAKAGE,,,SURE,,, VERIFIED AND CONFIRMED QUESTIONS AND ANSWERS BY COOLBOY

Physics-Obj!

1BCEDBEDBBD

11DEDCAEDCEB

21DDBBCBDBDC

31BEDBBCAEDD

41EDACEECCED

51DCECECDBCB

====================

(1a)

(i) A multimeter

(ii) Reads if there is short circuit in the electric circuit

(1b) 

(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

(1c)

Using M= ZIt

I = M/Zt 

I = 450/3.30*10-⁴ *25*60

I = 909A

====================

====================

(3a)

Range (R) is defined as the horizontal distance from the point of projection to the point where the projectile hits the projection plane again

(3b)

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°

====================

====================

(4a) 

(i)Flying bullet

(ii)A moving car 

(4b)

mgh = mc∆θ

∆θ = gh/c = 10*108/4200

= 0.257°C or 0.257K

====================

====================

(6a)

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

(6b)

Wavelength = 4/2.5 = 1.6m

====================

====================

(5a)

Vaporization is the conversion of a substance from the liquid or solid phase into the gaseous (vapour) phase.

(5b)

(i) Deform

(ii) No change

====================

====================

(8a)

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.

(8b)

(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.

====================

====================

Examkey.Net Section B.

====================

====================

(12)

[img]https://i.imgur.com/OUG3ZDr.jpg[/img]

====================

====================

(13)

[img]https://i.imgur.com/3KgrTIa.jpg[/img]

====================

====================

(14)

[img]https://i.imgur.com/KSUTjPk.jpg[/img]

====================

====================

(15)

[img]https://i.imgur.com/XjhOgxm.jpg[/img]

====================

====================

Completed!