# 2012 WAEC PHYSICS PRATICALS QUESTIONS AND ANSWERS

Filed in Uncategorized by on April 18, 2012

Mondaytech team are doing their best to make sure this year waec candidates come out with flying colours, this year questions are same as that of 2000 question.

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 to avoid 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.

Q 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 d Spring balance provided, determine d weight of object of mass M=50g. Record dsweight as W1.

ii.) Determine d weight of d object when completly immersed in water cotained in d beaker, record the weight as W2.

iii.) Determine the weightof the object when it is completely immersed in liquid labelled ‘L’. Record d weight as W3.Evaluate V=(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 d 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 hang on 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 of floatation.

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 wil float in a fluid (liquid or gas)when theupthrust exerted upon it by the fluid in which it floats equals the 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

GOODLUCK!