PHYSICS PRACTICAL ALTERNATIVE B & SPECIMEN

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WAEC PHYSICS PRACTICAL

(1)(a)(xi)

(PICK ANY TWO)

(i) The pendulum bob should be released gently without a push.

(ii) The angular displacement should be small.

(iii) The pendulum should swing in one vertical plane only.

(iv) Timing should be taken for a large number of oscillations to reduce error.

(v) Readings should be taken at eye level to avoid parallax error.

(vi) The experiment should be carried out away from wind or draught.

(1)(b)(i)

(PICK ANY TWO)

(i) A spherical bob offers less air resistance.

(ii) Its centre of gravity is well defined.

(iii) It ensures smoother oscillation.

(iv) It reduces frictional effects of air.

(v) It gives more accurate and reliable results.

(1)(b)(ii)

Maximum Potential Energy (P.E.)

(PICK ANY TWO)

(i) Occurs at the extreme positions of the swing.

(ii) The velocity of the bob is zero at this position.

(iii) The displacement from the mean position is maximum.

(iv) The height of the bob above the mean position is maximum.

3(b)(xv)

(PICK ANY TWO)

(i) Ensure all connections are tight and correct.

(ii) Close the key only when taking readings.

(iii) Avoid parallax error when reading the meters.

(iv) Ensure the jockey makes good contact with the potentiometer wire.

(v) Take readings when the pointer is steady.

(vi) Repeat readings and take the average.

3(c)

(PICK ANY TWO)

(i) Manganin has low temperature coefficient of resistance.

(ii) Manganin has high resistivity.

(iii) Its resistance remains nearly constant with temperature changes.

(iv) It gives more accurate and stable measurements.

(v) It is durable and does not corrode easily.

3(d)(i)

I = V/R

Where:

I = Current

V = Potential Difference

R = Resistance

Given:

V = 240.0 V

R = 12.4 Ω

I = 240.0/12.4

I = 19.35 A

Current drawn = 19.35 A

(d)(ii)

Given:

V = 110.0 V

I = 19.35 A

P = VI

P = 110.0 × 19.35

P = 2128.5 W

Power = 2.13 × 10³ W

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