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2014 WAEC Physics Practical Answers


THESE ARE NOT THE REAL
PHYSICS PRACTICAL ANSWERS
BUT GUIDE TO PHYSICS
PRACTICAL. IT WILL HELP YOU
TO STUDY YOUR PHYSICS
PRACTICAL. THEY ARE ASSUMED
QUESTIONS AND ANSWERS.

JUST STAY TUNED TO WAPBAZE 247 FOR THE LATEST.


QUESTION 1

Reading:

S/n: 1,2,3,4,5,6
L(cm):
150.0,120.0,100.0,80.0,60.0,40.0
t(sec):
4.800,4.100,3.300,2.600,1.900,1.200
t^-1(Sec^-1):
0.208,0.244,0.303,0.385,0.526,0.833
t^2(sec^2):
23.40,16.81,10.89,6.76,3.61,1.44
L/t^2(m/s^2):
6.510,7.139,9.183,11.83,16.6,27.7

Precautions:

-I ensured the experiment was
not
affected by air interference
when
determining the balance points
-I ensured the mass roll down
freely
as being influenced under
gravity
-I ensured that the readings
were
taken without any error

DEFINITIONS YOU NEED TO
KNOW:

FORCE OF GRAVITY: The total
gravitational force which acts
on a
body and so enables it,in turn to
exert an equal force on its
support

DISPLACEMENT: This Is defined
as the
distance moved in a specified
direction

NEWTONIAN MECHANICS:
This
is defined as
the rate of change of distance
moved
with time in a specified
direction or
rate of change of displacement

UNIFORM VELOCITY: A body
moved
with uniform velocity if its rate
of
change of distance moved with
time
in a specified direction is
constant

ACCELERATION: This is defined
as the rate
of change of velocity with time

INERTIA: The tendency of a
body to
remain at rest or if moving,to
continue its motion in a straight
line

UNIFORM ACCERATION: A body
moved
with uniform acceleration,if its
rate
of change of velocity with time
in a
specified direction is constant

DECCELERATION: A decreasing
velocity
or slowing down is usually
called
retardation.

QUESTION 2

Readings:

S/n: 1,2,3,4,5,6,7
D: 100,90,80,70,60,50,40
D^2:
10000,8100,6400,4900,3600,2500,1600
X1:
80.60,70.20,59.10,47.80,29.00,20.35,9.16
X2:
18.30,19.00,20.00,22.00,7.60,4.50,1.02.
L
(X1-X2):
62.20,51.20,39.10,24.70,21.40,15.85,8.14

PRECAUTIONS:

-i ensured parallax when
reading the
metre rule.
-i ensured that the intensity or
source of light was maintained.

Expected Question:

An illuminated object is placed
on the ...WAPBAZE.COM..
axis of a converging lens and a
magnified image is obtained on
the
screen. If the distance of the
image
from the lens is 45cm and the
magnification is 2,cal the focal
length
of lens.

SOLUTION:

V=45.00cm
m=2
u=?
M=v/u=45/2
22.5cm
F=uv/v+u
22.5*45.00/22.5+45.00
=1012.5/67.5
=15cm

QUESTION 3

Readings:

....WAPBAZE.COM...

S/n: 1,2,3,4,5
L1: 20,40,60,80,100
L2: 10,15,25,35,45
I1(A): 0.50,0.40,0.32,0.22,0.14
I2(A): 0.58,0.53,0.45,0.41,0.37
I1^-1: 0.20,2.50,3.13,4.55,7.143
I2^1: 1.724,1.890,2.22,2.44,2.70

PRECAUTIONS:

-I will ensure that the key is
opened
when no reading is taken to
avoid
battery wastage.
-I ensured tight connection
-I ensured error due to parallax
when
taking
reading from the ameter
-i will ensure that the circuit
element
are tightly connected to ensure
accurate result

NEED TO KNOW:

-Electromotive force is the
potential
difference between the
terminals of
a cell when no current is
flowing in
the circuit.







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