Question

SECTION B.
ANSWER ANYY THREE QUESTIONS IN THIS SECTION (60 MARKS
1. (a) State any three characteristic of physicist. (6
marks)
(b) Explain the merits of using SI units for measurement (4
marks)
(c) State the three fundamental mechanical quantities (3
marks)
(d) Copy and complete the Physical Quantity table below. (7
marks)
Physical quantity Units Symbol
Amount of substance ………. Mol
Electric current ……….. A
Length ………… M
Mass …………. Kg
Time Second ……….
………………… kelvin K
Luminous intensity Candela ………………

2. (a) Tabulate four differences between Mass and weight. (8 marks)
(b) State four reliable instrument for measuring the temperature of a body (4 marks)
(c) State three reasons why water is NOT used as a thermometric liquid? (6marks)
(d)State two reasons why alcohol is used as thermometric liquid? (2 marks)
.
3. (a) State three advantages of mercury as a thermometric liquid. (6 marks).
(b) Change 65 to centigrade (4 marks)
(c) Explain the concept ‘’work’’ to your science colleague. (4 marks)
(d) State the principle of Conservation Of Energy (2 marks)
(e) State Isaac Newton First law of motion.

(f)In order to find the height of a bridge, a rock was dropped off the bridge and timed.
If it took three seconds to hit the water, what is the height of the bridge? 2marks
4. (a) Determine the distance covered by a body in 4.0s if its initial velocity, u is 20 m/s
and acceleration is 4.0 m/s2
. (4
marks)
(b) state three effects of forces on objects (6 marks)
(c) State two demerits of Friction and suggest two ways of reducing it. (4marks)
(d) Explain three Clinical Applications of Gravity

Answer 1

al de ut tat² 2 = (20 x 4) + [_xk (4)? 80 + 32 112 6) A force can (in change speed of a body (i) Change direction of body (iii) Change shape of object. (C) Demerits of friction :- in it causes wear and tear of machinery. (ii) A lot of energy is wasted in overcoming friction to reduce frichan :- in Smooth the surfaces in contact ley polishing or oiling the surfaces til use ball bearings. 3 (d) Conservation of energy means that energy Can weither be created nor be destroyed, but can be transferred from I body to another Two ways 1