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4,719 questions

Question 1 of 20 4,719 total questions

Question 531

waec 2017

The diagram above illustrates a beaker of water being heated. It is observed that as the bubbles rise they get bigger in size.The reason for this observation is

Awater pressure on the bubbles decreases

Bdensity of water increases with rise in temperature

Cvolume of water increases with rise in temperature

Datmospheric pressure on the bubbles decreases

View Explanation & Discuss

Question 532

waec 2017

A plane is inclined at an angle \(\theta\) to the horizontal. Its velocity ratio is

A\(sin\theta\)

B\(tan\theta\)

C\(\frac{1}{sin\theta}\)

D\(\frac{1}{tan\theta}\)

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Question 533

waec 2017

Ice of mass 50g at 0°C was completely melted by 70% of the total heat energy supplied. Calculate the total heat energy supplied [Specific latent heat of fusion of ice = 336\(Jg^{-1}\)]

A2400J

B6800J

C7251J

D24000J

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Question 534

waec 2017

The energy stored in a spring of stiffness constant k = 2000\(Nm^{-1}\) when extended 4cm is

A0.16J

B1.60J

C16.00J

D160.00J

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Question 535

waec 2017

Which of the following graphs correctly represents the relationship between the kinetic energy (K.E) and the displacement (d) from point of release of a swinging pendulum bob?

BII

CIII

DIV

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Question 536

waec 2017

A body can undergo the following types of motion except

Arandom

Brotational

Ctranslational

Drelative

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Question 537

waec 2017

The angle at which a projectile must be fired to cover maximum range is

A30°

B45°

C60°

D90°

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Question 538

waec 2017

A motorist travelling at 72\(kmh^{-1}\) had his eyes shut for 0.4s during a hard sneeze. Calculate the distance covered by him during this time interval.

A50.0m

B28.8m

C18.0m

D8.0m

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Question 539

waec 2017

A body is whirled round a circular path at constant speed. Which of the following diagrams correctly indicates the direction of the body's velocity (v) and its acceleration (a)?

BII

CIII

DIV

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Question 540

waec 2017

A chemical balance is used for measuring

Avolume

Bmass

Cthickness

Ddensity

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Question 541

waec 2017

Which of the following processes is not a surface phenomenon?

ACondensation

BEvaporation

CPhoto Emission

DThermionic Emission

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Question 542

waec 2017

A body weighing 14N in air is partially immersed in water. If the mass of water displaced in the process is 200g, calculate the upthrust on the body. [g=10\(m/s^{2}\)]

A2.0N

B3.0N

C3.5N

D7.0N

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Question 543

waec 2017

Two forces 100N and 60N act on an object of mass 10kg as illustrated in the diagram above. Neglecting friction, calculate the acceleration of the object.

A4.0\(ms^{-2}\)

B13.4\(ms^{-2}\)

C16.0\(ms^{-2}\)

D22.6\(ms^{-2}\)

View Explanation & Discuss

Question 544

waec 2017

A ball is projected horizontally from the top of a tower. Neglecting air resistance, which of the following statements about its motion is/are correct?

I. Vertical acceleration on the ball decreases as it falls

II. The vertical force on the ball remains constant

III. The vertical speed of the ball increases as it falls

AI only

BII only

CI and II only

DII and III only

View Explanation & Discuss

Question 545

waec 2017

Which of the following statements about matter is not correct?

AMolecules of solids move more freely than molecules of liquids and gases

BMolecules of solids are more closely packed than those of liquids

CEnergy is required to break the intermolecular forces of attraction between molecules

DMolecules of liquids move about within the liquid and they are in constant motion

View Explanation & Discuss

Question 546

waec 2017

A body accelerates uniformly from rest at 2\(ms^{-2}\). Calculate its velocity when it has travelled a distance of 9m.

A3.0\(ms^{-1}\)

B4.5\(ms^{-1}\)

C6.0\(ms^{-1}\)

D18.0\(ms^{-1}\)

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Question 547

waec 2017

Which of the following is the dimension for impulse?

AMLT\(^{-1}\)

BMLT\(^{-2}\)

CMLT

DML

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Question 548

waec 2017

The diagram above is a micrometer screw gauge. Determine its reading.

A2.44mm

B2.46mm

C2.86mm

D2.96mm

View Explanation & Discuss

Question 549

jamb 2017

Which of the following is not true of an electrical charge?

ANegative charge means deficit electrons

BNegative charge means excess of electrons

Celectric current means movement of electrons

DAll of the above

View Explanation & Discuss

Question 550

jamb 2017

Which of the following is true of an electrical charge?

APositive charge means deficit electrons

BNegative charge means excess of electrons

Celectric current means movement of electrons

DAll of the above

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