Physics Past Questions and Answers

Which of the following statements correctly defines a simple machine? A device

A That can produce electric current
B Which can only carry people from one place to another
C With which work can be done easily
D Which changes the state of rest or of uniform motion of an object

Question 1412:

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 1413:

A hypsometer is used for determining

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

Question 1414:

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 1415:

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