NABTEB 2019 Physics Practical Answers Now Available

*NABTEB PHYSICS PRACTICAL SOLUTIONS*
(1a)
Initial position of the pointer on the metre rule
Xo = 37.20cm

Table of values
In a tabular form

S/N: 1.0, 2.0, 3.0, 4.0, 5.0
M(g): 70.00, 90.00, 110.00, 130.00, 150.00
X1(cm): 39.80, 40.00, 42.00, 43.10, 44.20
e = X1 – X0(cm): 2.60, 3.70, 4.80, 5.90, 7.00

(1aviii)
(i) I ensured that I avoided parallax error when taking readings on the metre rule.
(ii) I ensured firm suspension of the scale pan before and after leading the masses.

(1bi)
Hooke’s law states that the extension experienced by an elastic material is directly proportional to the force applied, provided the elastic limit is not exceeded

(1bii)
Pls deduce from the graph.

(1biii)
1/2mv² = Fe
M = 5g = 0.005kg
V = ?
F = 70N
e = 7cm = 0.07m
1/2 × 0.005 × v² = 70 ×0.07
V² = 70×0.07×2/0.005 = 1960
V = √1960 = 44.272 = 44.27m

Instantaneous velocity of the stone when released = 44.27m

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(2ai)
The focal length of the concave mirror provided is approximately equal to 15.0cm

Table of value

In a tabular form
S/N: 1.0, 2.0, 3.0, 4.0, 5.0

y(cm): 10.00, 20.00, 30.00, 40.00, 50.00

x(cm): 75.00, 60.00, 30.00, 24.00, 21.50

1/x(cm-¹): 0.0133, 0.0167, 0.0333, 0.0417, 0.0465

1/y(cm-¹): 0.100, 0.050, 0.033, 0.025, 0.020

(2avi)
Plot a graph

(2aviii)
(i) I ensured that the image of the cross wires were sharp on the screen before taking my readings.
(ii) I ensured that I avoided parallax error when taking readings on the metre rule by placing my eye vertically above the scale.

(2bi)
K is the focal length of the mirror

(2bii)
(i) They are used as shaving mirrors.
(ii) They are used as car driving mirrors.
(iii) They are used as dentist mirrors.

(2biii)
(i) The image is magnified (ie larger than the object)
(ii) The image is real.
(iii) The image is inverted.

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