Waec 2012 expo: waec 2012 physics questions and answers specimen for free.

Waec 2012 specimens free questions and answers for Physics.

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Today, i will be sharing with you, the latest 2012 waec questions and answers for PHYSICS PRACTICALS
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ELECTRICITY Readings.
Vo=0.40v ; Io=0.60A PJ(cm)| V(v) | I(A) 40.00 | 0.30 | 0.60 50.00 | 0.28 | 0.65 60.00 | 0.25 | 0.67 70.00 | 0.20 | 0.70 80.00 | 0.18 | 0.75
b.) Advantages of Potentiometer over voltmeter.

1. D potentiometer pass no current @ the time current is being taken
2. D potentiometer is more accurate than the voltmeter.

3. D potentiometer does not have the type of error associated with a pointed instrument like d voltmeter.

PRECAUTIONS:
I- ensured that the key was opened whenever the circuit was not in use so as toavoid the battery being run down;

I: avoided parallax error while taking readings frm both voltmeter and ammeter.
-I ensured tight connections to avoid fluctuation of d current.

Question: what is ohm’s law?
ANS: Ohm’s law states that the current flowing through a metallic conductor (e.g wire) is directly proportional to the potential difference across its ends,provided that the temperature and other physical conditions of the conductor are kept constant.

UPTHRUST:
Using the Spring balance provided, determined weight of object of mass M=50g. Record ds weight as W1.

ii: Determine the weight of the object when completly immersed in water contained in the beaker, record the weight as W2.

iii: Determine the weight of the object when it is completely immersed in liquid labelled ‘L’.

Record the weight as W3.EvaluateV=(W1-W3) and v=(W1-W2).

iv.) Repeat the procedure with the object of
mass M= 10, 15, 20 and 25.
In each cases, evaluate V=(W1-W3) and v=(W1-W2).

Plot the graph of ‘V’ on d vertical axis against’v’ nn the horizontal axis.

v.: Determine the SLOPE S1 of d graph.

State two (2) precautions to ensure accurate results.

b.: 1. A piece of Brass of mass 200g is hangon asring balance from right support and completely immersed io Kerosene of Density 8.0*10^2kgm-

3. Determine d reading on d Spring balance. (g=10ms-2 density of Brass=8.0*10^3kgm-3)

ii.: State Archimede’s Principle and d law offloatation.

READINGS
W1(g)|W2(g)|W3(g) 50.0 |44.00 |46.00 100.0|90.00 |90.00 150.0|134.0|140.00 200.0|176.0|180.00 250.0|222.0|220.00 ————————–
U =W1-W2(g) | V=w1-w3(g) 6.00 | 4.00 10.00 |10.00 16.00 |10.00 24.00 |20.00 30.00 |30.00,,

what is archimedes principle?
archimedes principle states that when a body is totally or partially immersed in a fluid (liquid or gas),it experiences an upthrust which is equal to the weight of fluid displaced.

What is principle of floatation?

It states that an object will float in a fluid (either liquid or gas)when the upthrust exerted upon it by the fluid in which it floats equalsthe weight of the object.

Precautions:- 1.
I avoid the masses being touched the bottom of the flask while immersed.

2. I avoid parallax error while taking my readings.

3. I avoid oscillations while taking readings.

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