Real and confirmed Physics Obj and Essay Answer – 2021 Expo

 

 

Physics obj

1-10 BCEDBDDBBD

11-20 DEBCBEDCCB

21-30 DDCBCBDBDC

31-40 BECBCAACAE

41-50 DCEEDEDCCD

51-60 BEECECDBCB
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(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
====================
====================

(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.
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(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.

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(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.

 

IMG-20210729-WA0055

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NUMBER 4

 

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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.

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NUMBER 8

 

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(12ai)
Fundamental quantity: quantities which are independent on other physical quantity. eg length, mass, time, current, amount of substance, luminous intensity, thermodynamic temperature

 

IMG-20210729-WA0070

 

 

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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.

IMG-20210729-WA0077

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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’.

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Number 15

IMG-20210729-WA0076

 

IMG-20210729-WA0056

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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.

 

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UNECO (Physics) Answer Obj & Essay – June/July Runz

NECO 2021 Physics Expo Answer

The 2021 NECO Physics (Obj & Essay) Solution Expo Questions and Answers have indeed been long expected and much anticipated. While the official body to conduct the 2021 Senior School Certificate Examination which is the National Examination Council was originally slated for June/July, but due to some reasons best known to the body, it is now scheduled for July/August.
The following is the examination schedule.

Tuesday 27th July 2021

  • Paper lll & ll: Objective & Essay – Physics 2:00pm – 5:00pm

You are welcome to the June/July 2021 Expo Runz Real and Verified NECO Physics (Obj and Essay/Theory) Questions and Answers.

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