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50 questions

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Question 21

jamb 2007

2 kg of water is heated with a heating coil which draws 3.5 A from a 200 V mains for 2 minutes. what is the increase in temperature of the water?

[specific heat capacity of water = 4200 jkg ^-1k^-1]

A30°

B25°

C15°

D10°

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Question 22

jamb 2007

I. Use a liquid with a high melting point.
II. use a liquid of high volume expansivity.
III. use a capillary tube of large diameter.

which of the above best describes how the sensitivity of a liquid-in-glass thermometer can be enhanced?

AI only

BII. only

CI and II only

DII and III only

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Question 23

jamb 2007

A clinical thermometer is different from other mercury in glass thermometers owing to

Athe constriction on its stem

Bthe grade of mercury used in it

Cits long stem

Dits wide range of temperatures

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Question 24

jamb 2007

A piece of iron weights 250 N in air and 200 N in a liquid of density 1000 kgm-3. the volume of the iron is?

A5.0 x 10^-3 m^-3

B4.5 x 10^-3 m^-3

C2.5 x 10^-3 m^-3

D2.0 x 10^-3 m^-3

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Question 25

jamb 2007

A reservoir 500 m deep is filled with a fluid of density 850 kgm-3. If the atmospheric pressure is 1.05 x 105 Nm-2, the pressure at the bottom of the reservoir is.
[g = 10ms-2]

A4.72 x 10⁶ Nm^-2

B4.36 x 10⁶ Nm^-2

C4.28 x 10⁶ Nm^-2

D4.25 x 10⁶ Nm^-2

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Question 26

jamb 2007

A machine has a velocity ratio of 4. if it requires 800 N to overcome a load of 1600 N,what is the efficiency of the machine?

A60%

B50%

C40%

D2%

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Question 27

jamb 2007

Two spheres of masses 5.0 kg and 10.0 kg are 0.3 m apart. Calculate the force of attraction between them?
[G = 6.67 X 10-11 Nm2 Kg\(^{-2}\)]

A3.50 x 10^-10N

B3.71 x 10^-8 N

C3.57 x 10^-2N

D4.00 x 10²N

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Question 28

jamb 2007

A car of mass 1500 kg goes round a circular curve of radius 50m at a speed of 40 ms-1. The magnitude of the centripetal force on the car is ?

A4.8 x 10⁴ N

B4.8 x 10³ N

C1.2 x 10³ N

D1.2 x 10² N

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Question 29

jamb 2007

A gramophone record takes 5s to reach its constant angular velocity of 4\(\pi\) rads^-1 from rest. Find its constant angular acceleration.

A0.4\(\pi\) rads^-2

B0.8\(\pi\) rads^-2

C1.3\(\pi\) rads^-2

D20.0\(\pi\) rads^-2

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Question 30

jamb 2007

The unit of moment of a couple can be expressed in?

AN m^-1

BN m^-2

CN m

DN m²

View Explanation & Discuss

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