Jamb Physics 2007 Past Questions and Answers

Question 6:

• 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?

A. 60%
B. 50%
C. 40%
D. 2%

Question 7:

• 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]

A. 4.72 x 10⁶ Nm^-2
B. 4.36 x 10⁶ Nm^-2
C. 4.28 x 10⁶ Nm^-2
D. 4.25 x 10⁶ Nm^-2

Question 8:

• 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?

A. 5.0 x 10^-2 ms^-2
B. 4.5 x 10^--2 ms^-3
C. 2.5 x 10^-2 ms^-8
D. 2.0 x 10^-2 ms^-3

Question 9:

• JAMB 2007

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

A. The constriction on its stem
B. The grade of mercury used in it
C. Its long stem
D. Its wide range of temperatures

Question 10:

• 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?

A. I only
B. II. only
C. I and II only
D. II and III only