If a cage containing a truck of coal weighing 750 kg is raised to a height of 90 m in a minute, what is the total power expended? [g = 10 ms²]

• A) 11.50 kw
• B) 12.60 kw
• C) 11.25 kw
• D) 12.10 kw

An object of weight 8kg on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is

• A. 48N
• B. 12N
• C. 27N
• D. 36N

The force between molecules of the same substance is termed

• A. elastic force
• B. repulsive force
• C. cohesive force
• D. adhesive force

In which of the following simple machines is the effort applied between the load and the fulcrum?

• A. Scissors
• B. Pliers
• C. Wheel barrow
• D. Sugar tongs

(a) What is the principle upon which the lighting in fluorescent tubes operate?

(b) State two factors which determine the colour of projection, g the acceleration of free fall due to gravity light from a fluorescent tube

Which of the following substances does not conduct electricity?

• A. graphite
• B. glass
• C. sulphuric acid
• D. table salt solution

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

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill?

• A. 528m
• B. 66m
• C. 136m
• D. 264m

A fish inside a pond appears to be at a depth of 1.5m when viewed vertically from above. The refractive index of the water in the pound is 1.3. Calculate the apparent displacement of the fish

• A. 2.50m
• B. 1.95m
• C. 1.50m
• D. 0.45m

(s) State the Heisenberg Uncertainty Principle.

(b) The product of the uncertainties in Heisenberg Uncertainty Principle is equal to or greater than a constant. State the mathematical expression for this constant.