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90 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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90 questions

Question 1 of 20 90 total questions

Question 21

waec 2021

Which of the sketched graphs above illustrates the correct variation of the gravitational force, Fg between two objects and the distance, d, between the centre

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Question 22

waec 2021

The distance between a node and its adjacent antinode of a transverse wave is equal to?

Ahalf of the wavelength.

Bthe wavelength.

Cthrice the wavelength.

Dquarter of the wavelength.

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Question 23

waec 2021

Which of the following statements about the molecules of solids and liquids is correct? They both

A have weak attraction.

B have wide separations.

C exhibit random motion.

D exhibit vibratory motion.

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Question 24

waec 2021

Electric motor primarily converts?

Aelectrical energy to chemical energy.

Bkinetic energy to potential energy

Celectrical energy to mechanical energy

Delectrical energy to heat energy.

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Question 25

waec 2021

A heat sensitive resistor made of a semiconductor is called?

Athermometer.

Bthermostat.

Cthermistor

Dthermopile.

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Question 26

waec 2021

Opening in the eye through which light passes to the retina is called the?

Apupil

Bcornea.

C iris

Doptic nerve.

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Question 27

waec 2021

Which of the following factors does not affect the rate of evaporation of a liquid?

Atemperature

Bvolume

Cwind

Dsurface area

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Question 28

waec 2021

Formation of hydrogen bubbles at the copper plate of a primary cell is called?

Apolarization.

B back e.m.f.

C electrolysis.

D local action.

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Question 29

waec 2021

The reason for laminating the soft iron core of a transformer is to?

Areduce eddy current.

B reduce magnetic flux.

Cincrease the magnetic flux.

D reduce its efficiency.

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Question 30

waec 2021

Which of the following quantities is not an example of force?

AMass

BTension

CWeight

D Friction

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Question 31

jamb 2021

A 2H inductor has negligible resistance and is connected to a \(\frac{50}{\pi}\) Hz A.C supply. The reactance of the inductor is?

A200\(\Omega\)

B50\(\Omega\)

C\(\frac{100}{\pi}\)

D\(\frac{25}{\pi \Omega}\)

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Question 32

jamb 2021

An astronomical telescope is said to be in normal adjustment when the?

Aeye is accommodated

Bfocal length of an object lens is longer than that of eye piece

Cfinal image is at the near point of eye

Dfinal image is at infinity

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Question 33

jamb 2021

The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?

A0.33

B0.50

C0.67

D0.75

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Question 34

jamb 2021

The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?

Aconcave mirror of focal length 5cm

Bconcave mirror of focal length 10cm

Cconvex mirror of focal length 5cm

Dconvex mirror of focal length 10cm

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Question 35

jamb 2021

A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is?

A3m

B5m

C6m

D10m

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Question 36

jamb 2021

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 180Hz?

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Question 37

jamb 2021

If a sound wave goes from a cold air region to a hot air region, its wavelength will?

Aincrease

Bdecrease

Cdecrease then increase

Dremain constant

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Question 38

jamb 2021

The equation of a wave traveling along the positive x-direction is given by; y = 0.25 x 10\(^{-3}\) sin (500t - 0.025x). Determine the angular velocity of the wave motion.

A0.25 x 10\(^{-3}\)rads\(^{-1}\)

B0.25 x 10\(^{-1}\)rads\(^{-1}\)

C5.00 x 10\(^{2}\)rads\(^{-1}\)

D2.50 x 10\(^{3}\)rads\(^{-1}\)

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Question 39

jamb 2021

Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss (specific heat capacity of copper = 400Jkg\(^{1}\)k\(^{-1}\), latent heat of fusion of ice = 3.3 x 10\(^{5}\)Jkg\(^{-1}\))

A\(\frac{8}{33}\)kg

B\(\frac{3.3}{80}\)kg

C\(\frac{80}{33}\)kg

D\(\frac{3.3}{8}\)kg

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Question 40

jamb 2021

The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20º and 80ºC respectively is?

A3.0 x 10\(^{2}\)km\(^{-1}\)

B3.0 x 10\(^{3}\)km\(^{-1}\)

C5.0 x 10\(^{3}\)km\(^{-1}\)

D3.0 x 10\(^{4}\)km\(^{-1}\)

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