Waec Physics 2011 Past Questions and Answers

Question 16:

• WAEC 2011

The radius of a wheel is 30.0 cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine. Assuming 100% efficiency

A. 600.0N
B. 40.0N
C. 24.0N
D. 20.0N

Question 17:

• WAEC 2011

A hypsometer is used for determining

A. Steam point
B. Relative humidity
C. Ice point
D. Relative density

Question 18:

• WAEC 2011

Which of the following equations shows how how the linear expansivity (\(\alpha\)) and the cubic expansivity (\(\gamma\)) of a material are related?

A. \(\gamma = \alpha\)
B. \(\gamma = 1 - \alpha\)
C. \(\gamma = 2 \alpha\)
D. \(\gamma = 3 \alpha\)

Question 19:

• WAEC 2011

Which of the following statements about anomalous expansion of water are correct? i. There is contraction between 0^oC and 4^oC. ii. There is expansion between 0^oC and 100^oC. iii. The volume is minimum at 4^oC. iv. The volume is maximum at 4^oC

A. I and ii only
B. Ii and iii only
C. I and iii only
D. Ii and iv only

Question 20:

• WAEC 2011

Which of the following assumptions is not valid for an ideal gas ?

A. Molecules of a particular gas are identical
B. Molecules moves freely throughout the volume of the container
C. Force of attraction between molecules is negligible
D. Molecules move at constant speed between collisions