[WAEC CHOCK] 2014 Waec Physics (Essay &Obj) Get de Answer now

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PHYSICS ANSWERS

VERIFIED PHYSICS OBJ
1DABABACBBB
11DCABCBBAAC
21ABBCCDCDBB
31CBDCBCDDAA
41DDBADBDAAB

Nos Answered: 2,4,5,7,8,9,10,11
————————————–

PLS TAKE NOTE OF THESE SYMBOLS:
@Means Tita sign whch looks like crossed-zero.
^Means Raise to power .
*Means Multiply
Degree looks like a small zero.

(2.) R=(U^2sin2@)/g
78=(30*30 sin2@)/10
0.8667=sin2@
2@=60
@=30

(4.) young modulus=stress/strain
stress=F/A=35000/4=8750
strain=e/l=0.025/50=0.0005
young modulus=8750/0.0005=17500000

5a)
Gas can conduct electricity under low
pressure and high votage.

5b)
cathode
2. R=(U^2sin2@)/g
78=(30*30 sin2@)/10
0.8667=sin2@
2@=60
@=30
4)
young modulus=stress/strain
stress=F/A=35000/4=8750
strain=e/l=0.025/50=0.0005
young modulus=8750/0.0005=17500000

(7a)
The minimum energy of the incident ray of the light
must be equal to the work function of the material or
above the work function of the metal.

(7b)(i) polarization.
(ii) diffraction.

(8a)
(i) Rotational Motion
I.The movement of the blades of a fan.
II.The motion of the wheel of a car.
(ii) Linear Motion
I.The motion of a boy from a point to another point on
a straight line.
II.The motion of a ball on a straight course.

(8b.)
AIM: To determine the density of an irregularly shaped
solid
APPARATUS: An irregularly shaped solid, a beam
balance,a measuring cylinder,a price of thread
PROCEDURE: Place the irregularly shaped solid on the
beam balance and measured its mass as mkg and
place the solid in the measuring cylinder that contains
water up to say xm^3 with the aid of the
thread.Record the new volume of ym^3.

(9)(a)
Heat capacity is the quantity of heat required to
change the temperature of a substance by 1 k or
1degree Celsius

(9b) I. It changes the phase
(9d) Given,
mass of pepper soup, m=800g
=0.800kg
Initial temprature of pepper soup,
tita =30degree C
Power of the microwave oven,
P=1200w
Time taken, t =3minutes =3*60s =180s.
Specific heat capacity of pepper soup,
c=4000j/kg k.

(9di)final temperature of the pepper soup,
@2=? ,
Heat given by d microwave oven= Heat absorbed by d
pepper soup.
Pt= mc(@2 – @1),
1200 * 180= 0.8 * 4000(@2 – 30),
216000= 3200(@2 – 30),
@2 – 30=67.5 ,
@2 = (67.5 + 30)degrees ,
@2 = 97.5degree Celsius

NOTE THAT: @ Means tita sign

(9Dii) containers with tight-fitting lids are not suitable
for use in microwave cooking because there must be
room for expansion which can only be catered for if
the lids are not tight-fitted

(9diii) there is dent on the container because the final
temperature was so large compared to the material
used in making the container,I.e plastic.and plastics
are not very good for such heat.The cooling of the
plastic cannot be uniform.

(10)(a)
The three characteristics of sound are:
(i)pitch
(ii)quality or timbre
(iii)loudness or intensity.
Factor on which each of them depends.
(i)pitch depends on the frequency
(ii)quality or timbre on the harmonics
(iii)loudness or intensity depends on the amplitude.

(11a.) EMF is the potential difference between the
terminals of a cell when it is not delivering any current
in an external circuit

(11bi)when a steady current flows along a uniform
wire, there is steady potential drop throughout its
length. thus each unit length of the wire will have a
constant P.D. across it
(ii)-the potentiometer measures EMF correctly since
no correction is needed to be made for the volt lost
-it measures the EMF to a higher degree

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