# 2021 Neco Physics Obj & Essay Questions And Answers Expo Runz

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Expobite – 29th, July 2021
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Physics-THEORY
(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
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(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°
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(4a)
(i)Flying bullet
(ii)A moving car

(4b)
mgh = mc∆θ
∆θ = gh/c = 10*108/4200
= 0.257°C or 0.257K
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(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
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(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
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(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.
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### Thursday 29th July 2021

• Paper lIl & Il: Objective & Essay – Physics Shrs 10:00am – 1:00pm

## 2021/2022 NECO Physics Answers for Essay Objectives Questions Available Now

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