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96 questions

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Question 21

waec 2008

A very sensitive spring balance was used to determine the weight of an object at the north pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that

Ait is very hot at the equator

Bthe spring balance has expanded

Cthe acceleration of free fall due to gravity varies with location

Dthe mass of the body is reduced

View Explanation & Discuss

Question 22

waec 2008

A rectangular block of dimensions 2.0m x 1.0m x 0.5m weighs 200N. calculate the maximum pressure exerted by the block on a horizontal floor.

A100Nm^-2

B200Nm^-2

C300Nm^-2

D400Nm^-2

View Explanation & Discuss

Question 23

waec 2008

A car travelling with a uniform velocity of 30ms^-1 along a horizontal road overcomes a constant frictional force of 600N. Calculate the power of the engine of the car

A18kW

B20kW

C180kW

D200kW

View Explanation & Discuss

Question 24

waec 2008

Which of the following is/are in random motion? i. Pollen grains in water ii. The molecules of hydrogen gas ii. Fine chalk particles floating in air

Ai and ii only

Bi and iii only

Cii and iii only

Di, ii and iii

View Explanation & Discuss

Question 25

waec 2008

which of the following statements about Archimedes' principle is correct? The upthrust on a body is a measure of the

Amass of fluid displaced

Bweight of the body

Cvolume of the body

Dweight of the fluid displaced

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Question 26

waec 2008

Which of the following sets of quantities is fundamental?

Alength, mass and time

Bspeed, length and time

Cspeed, mass and distance

Ddistance, speed and time

View Explanation & Discuss

Question 27

waec 2008

If the air inside a rigid box is heated, the i, average speed of the molecules increases ii. pressure of the air increases iii. average separation of the molecule increases. Which of the statements above are correct?

Ai and ii only

Bii and iii only

Ci and iii only

Di, ii and iii

View Explanation & Discuss

Question 28

jamb 2008

\(^{14}_7\)N + \(^4_2\)He → \(^{17}_8\)O + X

In the equation above, the particles X is?

Aa proton

Ba neutron

Can α - particle

Da β - particle

View Explanation & Discuss

Question 29

jamb 2008

If electron are accelerated from rest through a potential difference of 10kv, what is the wavelength of the associated electron?
[m = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C, h = 6.6 x 10\(^{-34}\)js]

A1.22 x 10^-11m

B3.87 x 10^-10m

C2.27 x 10¹¹m

D2.27 x 10¹⁴m

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Question 30

jamb 2008

Given the inductor of inductance 5mH, 10mH and 20mH connected in series, the effective inductance is

A0.35mH

B3.50mH

C2.90mH

D35.0mH

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Question 31

jamb 2008

Find the effective resistance in the diagram above

A6 Ω

B12 Ω

C18 Ω

D24 Ω

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Question 32

jamb 2008

If a concave lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?

A10 cm

B15 cm

C20 cm

D25 cm

View Explanation & Discuss

Question 33

jamb 2008

The above figure shows the motion of a progressive wave along a string. The particle motion of the medium is in direction?

Aparallel to OX

Bparallel to OY

C60^o to OX

D60v to OY

View Explanation & Discuss

Question 34

jamb 2008

The diagram above is the heating curve for a solid, QR is the?

Amelting region

Bboiling region

Csublimation region

Devaporating process

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Question 35

jamb 2008

The efficiency of the pulley system shown above is 80%. find the effort E required to lift the load of 1200N

A275N

B325N

C375N

D573N

View Explanation & Discuss

Question 36

jamb 2008

The diagram above shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will be in equilibrium again by?

Amoving Q nearer to O

Bmoving P nearer to O

Caddding a weight Q to Q

Dmoving P further away from O

View Explanation & Discuss

Question 37

jamb 2008

A body of mass 4 kg resting on a smooth horizontal plane is simultaneously acted upon by two perpendicular forces 6N and 8N. Calculate the acceleration of the motion

A2.5 ms^-1

B3.0 ms^-1

C4.0 ms^-1

D4.5 ms^-1

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Question 38

jamb 2008

A force F required to keep a 5 kg mass moving round a cycle of radius 3.5 m at a speed of 7 ms-1. What is the speed, if the force is tripled?

A4.0 ms^-1

B6.6 ms^-1

C12.1 ms^-1

D21.0 ms^-1

View Explanation & Discuss

Question 39

jamb 2008

The resultant of two forces 12N and 5N is 13N. What is the angle between the two forces?

A0^o

B45^o

C90^o

D180^o

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Question 40

jamb 2008

The dimension of electromotive force are?

AML²T^-3I^-1

BML²T^-3I^-2

CM²LT^-2I^-1

DM²L²T^-1I^-1

View Explanation & Discuss

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