Physics Past Questions and Answers

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 3607:

A hypsometer is used for determining

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

Question 3608:

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 3609:

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

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

Question 3610:

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