home
Home
home
JAMB
home
WAEC
home
NECO
home
NABTEB
home
NEWS

Watch/Download the video below to see how to get JAMB CBT Answers Directly to your computer. After Watching Text "I NEED JAMB BANK DETAILS" to 09034826855 to receive the procedures on how to Subscribe in order to score 280 and above.

WAEC GCE 2019 - PHYSICS ANSWER
WAEC GCE 2019 - PHYSICS ANSWER

WAEC GCE 2019 - PHYSICS ANSWER


+++++++++++++++++++++++++++
KEEP REFRESHING THIS PAGE

+++++++++++++++++++++++++++

ANSWERS:

(2a)
H=ut+½gt²
Where H=80m, t=?
80=0(t) + ½(10)(t²)
80=0 + 5t²
80=5t²
80/5=t²
16=t²
t=√16
t=4s

(2b)
Range = U²/g
20²/10
=400/10
=40m



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

(3)
F = KAV/L
FL = KAV
K = FL/AV
Where F = ma
= MLT-²
r = M, V = LT-¹
And A = M²

K = MLT-² × M/m² × LT-¹
K = LT-² ×L-¹T-¹
K = T-¹



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

(5)
(i) Temperature of the body
(ii) Nature of the body
(iii) Distance between the body and the radioactive source

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

(6a)
Ferromagnetic materials are those substances which exhibit strong magnetism in the same direction of the field, when a magnetic field is applied to it.

(6b)
(i) Iron
(ii) Nickel

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

(8)


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

(11a)
An electric field is a region where an electric force is experienced by a charged body.

(11b)
In a tabular form
Under gravitational potential
(i) Scalar quantity
(ii) Unit is Joule per coulomb

Under gravitational field strength
(i) Vector quantity.
(ii) Unit is Newton per coulomb.

(11ci)
Equivalent capacitance = 5uf//(2uf + 2uf)
= 5uf // 4uf
= 5×4/5+4 uf
= 20/9 uf
= 2.22uf

(11cii)
Total energy stored = 1/2cv²
= 1/2×20/9×10^-6×12×12
=160×10^-6
= 0.00016Joules.

(11di)
Given: Im = 20×10^-3A; V = 25sin100πl
Capacitive reactance Xl = Vm/Im = 25/26×10^-3 = 1250ohms

(11dii)
1/2πfc = Xl
Where f = 50Hz
1/2×22/7×50c = 1250
314.286c × 1250 = 1
392857 c = 1
C = 1/392857 = 2.545×10^-6F
= 2.545uf

(11e)
A phasor diagram is a graphical way of representing the magnitude and directional relationship between two or more alternating quantities.
name



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


(12a)
Thermoelectrons are electrons emitted at a high temperature such as one produced in a thermionic valve. They are negatively charged.

(12b)
(i) Low voltage battery
Used to heat the heater or heating element.
(ii) Target metal
Used to collect the emitted electrons.

(12Ci)
α - particles has a helium nuclei He while a β-particle has high energy electrons.

(12Cii)
α - particle has a charge of +2e while β-particle has a charge of -e.

(12di)
The radioactive decay law states that the probability per time that a nucleus will decay is constant, independent of time.

(12dii)
(i) Damage to skin.
(ii) Causes cancer.

(12ei)
Given 238 U --> m X + 2α
92 n
= 238 U --> m X + 2 4He
92 n 2
m+(2×4) = 238
m + 8 = 238
m = 238 - 8 = 230
Also
N + (2×2) = 92
N + 4 = 92
N = 92 - 4
n = 88

(12eii)
230
X
88

No of neutrons = 230 - 88 = 142
Neutron - Proton ratio = 142/88 = 1.61

(12eiii)
It is unstable.








+++++++++++++++++++++++++++
ANSWER LOADING......
+++++++++++++++++++++++++++






0 Response
FORUM POST LOCKED FOR COMMENTING

Ads; Click Here Now to See How to Make Cool Cash Here in Examface.net

Contact Mr.prof
| wakagist|