Question 1
Why is it safer to carry explosive fuels in metal cans instead of plastic can
Answer
Explosive fuels get charged by rubbing when being carried which could result in sparking and even explosion. This can occur in plastic cans. In metal can, any charge generated continually leaks out hence safer.
Question 2
State one of the properties of a magnet.
Answer
- Directional property
- A magnet has two poles
- A magnet has two poles
Question 3
The sketch is a displacement – time graph of a wave traveling at 320ms-1.
Find the wavelength of the wave.
Answer
Clockwise moments = anticlockwise moments
Question 4
A ray of light falls on a plane mirror such that the reflected ray makes an angle of 200 with the incident ray. The mirror is then turned about an axis of right angles to the plane of the rays through an angle such that the angle between the incident and the new reflected ray is 100 as shown
(a)State the direction of rotation of the mirror.
(b) Determine the angle of rotation of the mirror
Answer
a)Anticlockwise
b)
b)
Question 5
A student made a simple electromagnet by winding a coil of insulated copper around an iron bar as shown
(a) Determine the polarity of A and B.
(b) Another student used a U-shaped iron bar to make an electromagnet.
Complete the windings such that both A and B are N-poles.
Answer
(a) A : S-pole
B : S-pole
(b)
B : S-pole
(b)