Neco Gce 2016 PHYSICS (obj and essay) Answers – Nov/Dec Expo

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*100%VERIFIED NECO GCE PHYSICS ESSAY ANSWERS BY Da cyber sulyman hkn*

 (1a) Step up transformer has higher number of cents in the secondary While the step down transformer has lower numbers of cents in secondary

(1b) M=zi t P=Mass/volume Volume =400*0.08 32cm^3 Mass - 8.9*32 =284.85 m=zi t t=m/ZI=284.8/3.3*10^-4*3 t=28.77*10^4 secs t=2.877*10^5secs


 2a) WEIGHT i)Weight is a force with which gravity pulls on it

 ii)The weight is a force a body exerts when it is in gravitational MASS i) mass is the actual amount of material contain in the body

 ii)Mass of the body is the constant quantity and does not change with the change of position or location


5a) boiling point of a liquid is d point at which d saturated vapour pressure is equal to atmospheric pressure.


 5b) quantity of heat 1^2 RT given that 1=3A R=12n T=25*60=1500s quantity of heat= 3^2*12*1500 =9*12*1500 =162000


12a) Fundamental quantities are the basic quantities that provide the standard units of mesurenment example is length while derived quantities are quantities obtained from the fundamental quantites in form of combination example is force


 12b) i)it opposes motion ii)the liniting frictional force is independent of the surface area in contact


 12c) the centre of gravity of a body is defined as the part in which the resultant weight of a body appears to act


 12d) f=60Hz, amplitude=6cm, d=4cm i)velocity V=wr where r=d=4cm =2^fr =2*3.142*60*4/100 =15.08m/s



ii)acceleration,a =w^2r =Vw =2*3.1423*60*15.08 =5686.37m/s^2 13ai) wheel-barrow is termed second class lever because its load is between the fulerum and the effort


13aii) TABULATE FIXED PULLY i)it consist of a wheel and a shaft and is used in conjuction with a belt to transfer energy to another fixed pully ii)the input force and output force are equal MOVABLE PULLY i)it consist of a shell,a movable wheel and a rope ii)the input and output put forces are not equal


 3bi) -fahrenheit scale -kelvin scale 3bii) -fahrenheit scale -32degre^f-212degree^f -kelvin scale -273k-373k

13c) given that mass of copper ball=30g=0.03kg temperature of copper ball=180degree census mass of caloritueter=80g=0.08kg


 14ai) snell's law of refraction states that the ratio of sine of angle of incidence to the sine of angle of refraction is constant for a given pair of media


 14bi) i-to measure the velocity of sound in air ii-it is used for oil exploration iii-it is used to determine the depth of the sea


 14bii Music -Uniform vibration -Constant frequency of vibration -Music is good for hearing Noise -irregular vibratiom -no fixed frequencies of vibration -noise is bad for hearing Note pie must be writing down in symbol


14c) L = 3pie/4 0.7 = 3pie/4 0.7x4/3 = pie Pie= 0.93 V= F pie 340=f x 0.93 F = 340/0.93 = 365.59 F= 365.6HZ



(16a)radioactive element are used in agriculture as radioactive tracers and to induce mutations in plants and animals to obtain new and improved varieties.biologist used them as tracers or markers to help trace the paths of metabolic processes in plants and animals.geologist and archaeologist use the measurement of half-life to estimate the age of rocks and carbon-


14(radiocarbon) to date recent organic remains. This is called radioactive dating


 *Da cyber sulyman*



 (16b) ii..Radioactivity emit some extra ordinary types of rays(alpha, beta and gomma) which are helpful in human beings in minutes quantity



 3a) Amplitude can be defined as the maximum extent of a vibration or oscillation,measured from the position of equilibrium



 3b) Period is a length or a portion of Time



 3c) Frequency can be defined as the rate of which something occurs over a particular time


3a)newtons third law of motion states that action and reaction are equal and opposite in direction


 4b)Data M1=15kg U1=50ms^-1 U2=-45ms^-1 M2=? V=15ms^-1

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