Physics Past Questions and Answers

I. The earth is not spherical but elliptical in shape<br/>II. Variation in latitude and longitude<br/>III. Rotation of the earth on its axis<br/>IV. Variation in the density of the earth<br/>On which combination of the above does the weight of an object vary on the earth's surface?

A I, II, III and IV
B II, III and IV only
C I, II and III only
D I and II only

Question 1702:

The efficiency of a machine is always less than 100% because the

A Work output is always greater than the work input
B Load lifted is always greater than the effort applied
C Effort applied is always greater than the load lifted
D Velocity ratio is always greater than the mechanical advantage

Question 1703:

Which of the following consists entirely of vector quantities?

A Velocity, magnetic fulx and reaction
B Tension, magnetic flux and mass
C Displacement, impulse and power
D Work, pressure and moment

Question 1704:

Ice cubes are added to a glass of warm water. The glass and water are cooled by

A Conduction only
B Convection only
C Conduction and convection
D Convection and radiation

Question 1705:

A ray of light strikes a plane mirror at an angle of incidence of 35°. If the mirror is rotated through 10°, through what angle is the reflected ray rotated?

A 70Â°
B 45°
C 25Â°
D 20Â°