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4,719 questions

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Question 331

waec 2020

A diver steps off a diving platform that is 10m above the water. If there is no air resistance during the fall, there will be a decrease in the diver's

Agravitational potential energy

Btotal mechanical energy

Ckinetic energy

Dmomentum

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Question 332

waec 2020

Which of the following statements about the process of melting of a solid are true? The temperature of the solid will

I. remain steady until melting starts.

ll. keep rising until melting starts,

Ill remain steady as melting proceeds.

V, keep rising as melting proceeds.

AI and llI only

BIlI and IV only

CIl and Ill only

Dll and IV only

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Question 333

waec 2020

An electron of mass 9.1x 10\(^{-31}\) kg is travelling at a speed of 2.0 x 10\(^6\)ms\(^{-1}\). Calculate the associate wavelength of the electron. [h = 6.6. x 10\(^{-34}\) Js]

A3.63 x10\(^{-10}\) m

B3.63 x 10\(^{-8}\) m

C3.63 x 10\(^{-7}\) m

D6.89 x 10\(^{-4}\) m

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Question 334

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 335

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 336

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 337

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 338

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 339

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 340

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 341

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 342

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 343

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 344

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 345

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 346

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 347

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 348

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 349

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 350

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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