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98 questions

Question 1 of 18 98 total questions

Question 41

jamb 2011

A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?

[velocity of sound in the air = 330 ms-1]

A30 s

B10 s

C10 s

D15 s

View Explanation & Discuss

Question 42

jamb 2011

The ground is always cold at night because the

Aatmosphere absorbs the sun's energy at night

Bearth radiates heat to the atmosphere at night

Csun no longer shine at night

Datmosphere reflects the sun's energy at night

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Question 43

jamb 2011

A perfect emitter or absorber of radiant energy is a

Aconductor

Bblack body

Cwhite body

Dred body

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Question 44

jamb 2011

Which of the following electromagnetic waves has the highest frequency?

Autra - violet rays

Bradio waves

Cx - rays

Dinfrared - rays

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Question 45

jamb 2011

Which of the following types of waves needs a medium for propagation?

Asound waves

Blight waves

Cradio waves

Dx - rays

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Question 46

jamb 2011

Which of the following could be effectively used to reduce friction?

Akerosene

Bgrease

Cwater

Dpetrol

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Question 47

jamb 2011

I. Density of the liquid.
II. Depth below the surface of the liquid.
III. Surface area of the liquid.
In which of the statement above will pressure be dependent?

AI and II only.

BII and III only.

CI, II and III only.

DI and III only.

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Question 48

jamb 2011

A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?

A80 J

B500 J

C300 J

D120 J

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Question 49

jamb 2011

I. High thermal capacity.
II. High sensitivity.
III.Easy readability.
IV. Accuracy over a wide range of temperature
From the statement above, the qualities of a good thermometer are

AI and II

BI, II,III and IV

CI, III and IV

DII, III and IV

View Explanation & Discuss

Question 50

jamb 2011

A copper wire was subjected to a tensile stress of 7.7 x 10\(^7\). Calculate the strain of the wire.
[Young modules = 1.1 x 10\(^11\) Nm\(^{-2}\)]

A2. 0 x 10^-5

B7.0 x 10^-3

C7.0 x 10^-4

D2.2 x 10^-4

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Question 51

jamb 2011

A metal of volume 40 cm\(^3\) is heated from 30 °c to 90 °c, the increase in volume is

[Linear expansivity of the metal = 2.0 x 10\(^{-5}\)K\(^{-1}\)]

A0.12 cm³

B4.00 cm³

C1.20 cm³

D0.40 cm³

Eno correct option

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Question 52

jamb 2011

An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.

[g = 10 ms²]

A50 N

B520 N

C220 N

D80 N

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Question 53

jamb 2011

If a tube of small radius opened at both ends is placed in a liquid, the liquid will

Aremain at the same level irrespective of whether the liquid wet the glass or not

Bfall below the liquid level if the liquid wets the glass

Cfalls below the liquid level if the liquid does not wet the glass

Drise above the liquid level if the liquid does not wet the glass

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Question 54

jamb 2011

A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?

[g = 10 ms^-2]

A600 J

B150J

C300 J

D450 J

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Question 55

jamb 2011

An object of mass 2 kg moves with a velocity of 10 ms¹ round at circle of radius 4 m. Calculate the centripetal force on the object

A25 N

B100 N

C50 N

D40 N

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Question 56

jamb 2011

If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?

A90 m

B30 m

C45 m

D60 m

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Question 57

jamb 2011

Two balls, X and Y, weighing 5 g and 50 kg respectively, were thrown up vertically at the same time with a velocity of 100 ms\(^{-1}\). How will their positions be one second later?

AX and Y will be 500 m from each other

BY will be 500 m ahead of X

CX will be 500 m ahead of Y

DX and Y both be 500 m from the point of throw

View Explanation & Discuss

Question 58

jamb 2011

A man standing on a lift that is descending does not feel any weight because

Athe inside of the lift is air tight

Bthe lift is in vacuum

Cthe lift's acceleration is same as acceleration due to gravity

Dthere is no gravitational pull on the man in the lift

View Explanation & Discuss

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