A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150Hz. Calculate the speed of the wave produced.

• A. 250\(ms^{-1}\)
• B. 625\(ms^{-1}\)
• C. 1200\(ms^{-1}\)
• D. 1500\(ms^{-1}\)

A block is acted upon by TWO horizontal forces as illustrated in the diagram below. The block accelerates at 1.5\(ms^{-2}\). Calculate the mass of the block.

• A. 6kg
• B. 9kg
• C. 10kg
• D. 15kg

The physical properties of soil include the following except

• A. PH
• B. colour
• C. moisture content
• D. porosity

A glass bottle of initial volume 2 x 10⁴cm³ is heated from 20^oC to 50^oC. If the linear expansivity of glass is 9 x 10^-6K^-1, the volume of the bottle at 50^oC is

• A. 20016.2cm^3
• B. 20005.4cm^3
• C. 20008.1cm^3
• D. 20013.5cm^3

An electron of charge 1.60 x 10\(^{-19}\)C is accelerated under a potential difference of 1.0 x 10\(^{5}\) V. Calculate the energy of the electron in joules.

A body of mass 12kg traveling at 4.2ms^-1 collides with a second body of mass 18kg at rest. Calculate their common velocity if the two bodies coalesce after collision

• A) 1.5 m/s
• B) 1.4 m/s
• C) 2.1 m/s
• D) 1.7 m/s

Which of the following substances is not an insulator?

• A. Aluminium
• B. Glass
• C. Plastic
• D. Clay

A body of mass 1000kg is released from a height of 10m above the ground. Determine its kinetic energy just before it strikes the ground .[g = 10ms^-2]

• A. 10J
• B. 10³J
• C. 10⁴J
• D. 10⁵J

(a) Differentiate between interference and polarisation as applied to waves.

(b) Mention two uses of polaroids

Two tuning forks of frequency 256Hz and 260Hz are sounded close to each other. What is the frequency of the beats produced?

• A. 2Hz
• B. 4Hz
• C. 8Hz
• D. 258Hz