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NECO Physics Questions and Answers 2021, objective and theory answers (Expo) for National examination council (June/July) 2021. NECO Physics objective and theory answers For you to have good NECO result in  Physics examination as well as repeated questions for free in this post. You will also understand how NECO (Chemistry) Physics questions are set and how to answer them.The National Examinations Council (NECO) is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and December/January respectively.

Physics NECO Exam Date & Time
Thursday 29th July, Paper III & II: Objective & Essay – Physics – 10:00am- 1:00pm

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### NECO Physics Essay Answers 2021(Expo)

PHYSICS OBJ
Physics Obj!
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Completed
(1a)
(i) A multimeter
(ii) Reads if there is short circuit in the electric circuit
(1b)
(i)A simple microscope uses one lens while a compound microscope uses two lens
(ii)A compound microscope produces a higher magnification than that of simple microscope
(1c)
Using M= ZIt
I = M/Zt
I = 450/3.30*10-⁴ *25*60
I = 909A
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(3a)
Range (R) is defined as the horizontal distance from the point of projection to the point where the projectile hits the projection plane again
(3b)
Time of flight: T= 2usinθ/g
sinθ = Tg/2u = 1.5*10/2*12
sinθ = 15/24 = 0.625
θ = sin-¹(0.625)
θ = 38.7°
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(4a)
(i)Flying bullet
(ii)A moving car
(4b)
mgh = mc∆θ
∆θ = gh/c = 10*108/4200
= 0.257°C or 0.257K
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(6a)
A stationary wave is produced by a superposition of two waves of the frequency and amplitude which are exactly out of phase with each other
(6b)
Wavelength = 4/2.5 = 1.6m
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(5a)
Vaporization is the conversion of a substance from the liquid or solid phase into the gaseous (vapour) phase.
(5b)
(i) Deform
(ii) No change
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(8a)
Lost Volt refers to the amount of energy lost (in a battery, generally) to energy resistance of components. It is generally fairly negligible, but to calculate: V=IR
where I is the current and R is resistance.
(8b)
(i) Secondary cell last long and can be used over again and again.
(ii) A secondary cell is rechargeable meaning that the chemical reactions taking place in the cell are reversible and can be carried out in the opposite direction to charge the cell again.           17a -electric incandescent light bulb or other light source (usually fan-cooled)
-reflector and “condensing” lens to direct the light to the slide.
– slide holder.
– focusing lens.
14a.
– Snell’s law of refraction states that “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media and given wavelength of light.” The constant in law is called refractive index and denoted by the letter ‘n’.
(12ai)
Fundamental quantity: quantities which are independent on other physical quantity. eg length, mass, time, current, amount of substance, luminous intensity, thermodynamic temperature
13a.
*Elastic Collision*
An elastic collision can be defined as a state where there is no net loss in kinetic energy in the system as the result of the collision.
*Inelastic Collision*
An inelastic collision can be defined as a type of collision where this is a loss of kinetic energy. The lost kinetic energy is transformed into thermal energy, sound energy, and material deformation.
(12ai)
Fundamental quantity: quantities which are independent on other physical quantity. eg length, mass, time, current, amount of substance, luminous intensity, thermodynamic temperature
6a)
A wave front is the locus of points characterized by
propagation of position of the same phase: a propagation
of a line in 1D, a curve in 2D or a surface for a wave in
3D. In other words a line or surface in the path of an
advancing wave on which all the particles are vibrating in
phase is called a wave front.
(1b)
Tabulate
– Simple Microscope it is used for reading small prints and for studying biological specimens.
– The magnifying glass or simple microscope is a convex lens which is used to produce magnified images of small object.
– When a converging lens is used as a simple microscope the object is placed between the principal focus and the optical center of the lens.
– The Compound microscope consists of two converging lenses of short focal lengths.
– To produce a higher magnification that obtained from a simple microscope.
(1c)
A simple microscope uses the optical power of single lens or group of lenses for magnification *While*; A compound microscope uses a system of lenses (one set enlarging the image produced by another) to achieve much higher magnification of an object.
14a.
– Snell’s law of refraction states that “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media and given wavelength of light.” The constant in law is called refractive index and denoted by the letter ‘n’.
(8a)
*Lost volt:* The potential difference between the two terminals of a cell decrease by an amount that does not contribute to the circuit, is called lost volt.
(1b)
A simple microscope uses the optical power of single lens or group of lenses for magnification *While*; A compound microscope uses a system of lenses (one set enlarging the image produced by another) to achieve much higher magnification of an object.
(3a)
The range of the projectile is the displacement in the horizontal direction. There is no acceleration in this direction since gravity only acts vertically. shows the line of range. Like time of flight and maximum height, the range of the projectile is a function of initial speed.
14a.
– Snell’s law of refraction states that “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media and given wavelength of light.” The constant in law is called refractive index and denoted by the letter ‘n’.  (1c)
A simple microscope uses the optical power of single lens or group of lenses for magnification *While*; A compound microscope uses a system of lenses (one set enlarging the image produced by another) to achieve much higher magnification of an object.
(1b)
Tabulate
– Simple Microscope it is used for reading small prints and for studying biological specimens.
– The magnifying glass or simple microscope is a convex lens which is used to produce magnified images of small object.
– When a converging lens is used as a simple microscope the object is placed between the principal focus and the optical center of the lens.
– The Compound microscope consists of two converging lenses of short focal lengths.
– To produce a higher magnification that obtained from a simple microscope.                                 