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1,904 questions

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Question 131

waec 2020

A ray of light travels obliquely from a less dense medium to a denser medium. Which of the following statements is true about the light?

AThe wavelength of the light increases in the second medium

BThe speed of the light increases in the second medium

CThe light refracts towards the normal

DThere Is a change in the frequency of the light

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Question 132

waec 2020

An a.c. generator can be converted to a d.c. electric motor by replacing the

Aslip rings with a split ring and connecting a battery

Bsplit ring with slip rings and connecting a battery

Ca.c. with d.c. source and connecting slip rings

Da.c. with d.c. source and connecting split rings

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Question 133

waec 2020

Water waves have a wavelength of 3.6cm and speed of 18cms\(^{-1 }\) in deep water. If the waves enter shallow water with wavelength of 2.0cm, calculate the speed of the waves in the shallow water.

A0.4cms\(^{-1}\)

B2.5cms\(^{-1}\)

C10.0cms\(^{-1}\)

D10.8cms\(^{-1}\)

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Question 134

waec 2020

Which of the following statements correctly explains why a total solar eclipse would be seen by people on only a small portion of the earth's surface? The

Amoon is larger in diameter than the earth

Bearth is larger in diameter than the sun

Cearth revolves around the sun

Dearth is larger in diameter than the moon.

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Question 135

waec 2020

In an electric circuit, an inductor of inductance 0.5 H and resistance 50\(\Omega\) is connected to an alternating current source of frequency 60 Hz. Calculate the impedance of the circuit.

A50.0\(\Omega\)

B450.5 \(\Omega\)

C195.0 \(\Omega\)

D1950.1 \(\Omega\)

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Question 136

waec 2020

In the hydraulic press, the force F applied is related to the diameter d of the cylinder by

AF \(\alpha\) d\(^2\)

BF \(\alpha\) d

CF \(\alpha\) d\(^{-1}\)

DF \(\alpha\) d\(^{-2}\)

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Question 137

waec 2020

The sketched graph above illustrates the heating curve of a 0.02kg of water. Determine the approximate value of the specific latent heat of vapourization of water

A2.25 x 10\(^6\) J kg\(^{-1}\)

B4.17 x 10\(^3\) J kg\(^{-1}\)

C2.00 x 10\(^3\) J kg\(^{-1}\)

D1.00 x 10\(^3\) J kg\(^{-1}\)

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Question 138

waec 2020

Which of the following statements about photoelectrons is correct?

AA faint green light produces photoelectrons with less kinetic energy than a bright red light

BA red light releases a smaller number of electrons than a green light

CA faint green light produces photoelectrons with greater kinetic energy than a bright red light

DA red light produces more photoelectrons than a green light

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Question 139

waec 2020

An electron of mass m and charge e moves in a circular path in a magnetic field of flux density B. How long does it take to complete one orbit?

A\(\frac{2me}{B\pi}\)

B\(\frac{2B}{me\pi}\)

C\(\frac{2\pi m}{Be}\)

D\(\frac{Be}{2 \pi m}\)

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Question 140

waec 2020

Which of the following statements about the motion of a simple pendulum is true?

AIt is a simple harmonic motion when the angle of displacement is large

BIt passes the equilibrium position with minimum speed

CIt possesses maximum kinetic energy at the extreme positions

Dlt swings faster at the poles than at the equator

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Question 141

waec 2020

The temperature of an object is raised by 120°C. The resulting increase in its absolute temperature is

A50K

B120 K

C200K

D393K

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Question 142

waec 2020

A motorcycle starting from rest is uniformly accelerated such that its velocity in 10s is 72kmhr\(^{-1}\). What is its acceleration?

A108ms\(^2\)

B86ms\(^2\)

C4ms\(^2\)

D2ms\(^2\)

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Question 143

waec 2020

The magnitude of the force experienced by a charge of 1.6 x 10\(^{-8}\)C in a uniform electric field of intensity 5 x 10\(^5\)NC\(^{-1}\) is

A3.2 x 10\(^{-14}\)N

B8.0 x 10\(^{-13}\)N

C8.0 x 10\(^{-3}\)N

D3.1 x 10\(^{13}\) N

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Question 144

waec 2020

What factors determine the frequency of a note emitted by a vibrating string?

AAmplitude of vibration, force constant of string and length of string

BAmplitude of vibration, force constant of string, and tension in string

CMass per unit length of string, tension in string and length of string

DForce constant of string, tension in string, and length of string.

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Question 145

waec 2020

Open Photo

The diagram above illustrates a ball of mass m sliding down a plank inclined at an angle of 0 to the horizontal. The kinetic friction between the ball and the plank is F and the acceleration of free fall is g. The net force on the ball along the plank is?

Amgsin \(\theta\) + F

BF - mgcos \(\theta\)

Cmgsin \(\theta\) - F

DF + mgcos \(\theta\)

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Question 146

waec 2020

The diagram illustrates a ball of mass m sliding down a plank inclined at an angle of 0 to the horizontal. The kinetic friction between the ball and the plank is F, and the acceleration of free fall is g. The normal force on the ball is?

Amgsin \(\theta\)

Bmgtan \(\theta\), mgcos \(\theta\)

Cmgcos \(\theta\)

Dmgcot \(\theta\)

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Question 147

waec 2020

A 500N box rests on a horizontal floor. A constant horizontal force is exerted on the box so that it moves through 8m. If the coefficient of kinetic friction between the floor and the box is 0.22, calculate the workdone on the box

A880J

B440J

C400J

D110J

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Question 148

waec 2020

Which of the current-voltage characteristics shown above is that exhibited an ohmic conductor?

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Question 149

waec 2020

The velocity of sound in air at 15°C is 340ms\(^{-1}\). Calculate the velocity at 47\(^o\)C

A790ms\(^{-1}\)

B602ms\(^{-1}\)

C358ms\(^{-1}\)

D322ms\(^{-1}\)

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Question 150

waec 2020

A parallel plate capacitor is charged and the charging battery is subsequently disconnected. lf the plates of the capacitor are moved farther apart by means of insulating handles, the

Acapacitance would increase

Bcapacitance would decrease

Ccharge on the capacitor would increase

Dcharge on the capacitor would decrease

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