NECO 2022 Physic Obj And Essay Answer – July/Aug Expo

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Physics obj
01-10: BACDCEDBEA
11-20: CBEAABDDAD
21-30: ACACAEBCDD
31-40: CDCAABBBDD
41-50: DCDCBCACED
51-60: CBBDCCCDAA


PHYSICS ANSWERS 

(1a)
(i) A flat metal plate that intercepts and absorb solar energy  
(ii) A transparent Cover that allows solar energy to pass through the cover and reduces heat loss from the absorber 
(iii) A layer of insulation on the back of the absorber reduce heat loss


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(2)
-TABULATE-
SCALAR QUANTITIES
(i) They have magnitude but no direction. 
(ii) Scalars are added by ordinary algebraic methods.

VECTOR QUANTITIES
(i) They have both magnitude and Direction. 
(ii) Vectors are added by Geometrical methods.

(2b)
R²=3²+4²
=9+16
=25

R=✓25
R=5N


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NO3


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NO4

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NO5


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(6a)
Transverse waves particles of waves move perpendicular in the direction of the wave while in longitudinal waves particles move horizontally in the direction of the wave.

(6b)
(i) Water waves
(ii) Sound waves
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(7)
(i) The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

(ii) 
- Kaleidoscope
- Periscope

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(12ai)
(i) It makes walking and running possible.
(ii) It enables gripping of belt in machines possible. 
(iii) It enables nails to stay in the wall when driven.

(12aii)
(i) It always resists the motion, so extra energy is required to overcome it.
(ii) It causes wear and tear of machines.
(iii) It decreases the life expectancy of moving parts of vehicles.

(12bi)
The bob does not oscillate forever. It comes to rest because air resistance resists its motion. The pendulum loses its kinetic energy to overcome this friction and stops after some time.

(12bii)
The period of oscillation of a simple pendulum is known to be affected by the length of the pendulum and the acceleration due to gravity. The period is known to be completely independent of other factors like the mass of the pendulum.

                   COMPLETED ✅



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