A wire is stretched between two points, 1m apart. If the speed of the wave generated on plucking the wire is 200ms^-1, what is the minimum frequency which will resonate with the wire?

• A. 50 Hz
• B. 75 Hz
• C. 100 Hz
• D. 200 Hz

The privatization exercise in Nigeria is a move towards a____________

• A. command economy
• B. mixed economy
• C. subsistence economy
• D. market economy

The signals from Ato modem X in the diagram below are

• A. analogue
• B. digital
• C. electrons
• D. protons

The confederal system of government is unpopular because ___________

• A. the government operates oligarchy system
• B. it does not follow due process
• C. it discourages rapid development
• D. all the component units are sovereign

Lines of unrhymed poetry are known as

• A. blank verse
• B. assonance
• C. consonance
• D. free verse

Which of the following organisms are the producers in an aquatic habitat?

• A. Benthons
• B. Phytoplanktons
• C. Zooplanktons
• D. Nektons

A plane inclined at an angle at 30° to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 120 N uniformly up the plane is

• A. 40N
• B. 60N
• C. 120N
• D. 200N

Water falls through a height of 50m. Determine the temperature rise at the bottom of the fall. [Neglect energy losses. Specific heat capacity of water = 4200Jkg^-1 K^-1, g = 10ms²]

• A. 0.119^oC
• B. 0.840^oC
• C. 1.190^oC
• D. 8.400^oC

(a) State one condition each necessary for the characteristics each of the following occurrences:

(i) Constructive interference of waves.

(ii) Total internal reflection.

(iii) Production of beats.

(b) In a resonance tube experiment using a tuning fork of frequency 256Hz, the first position of resonance was 35 cm, the next position was 100cm. Calculate the velocity of sound in air from the experiment.

(c)(i) State the three classifications of musical instalments

(ii) Give one example each of the classifications stated in (c)(i).

(d) Calculate the critical angle for light traveling from glass to air. [refractive index of glass = 1.5].

(e) The speed of sound in a medium at a temperature of 102 °C is 240 m s\(^{-1}\). If the speed of sound in the medium is 3 10 m s\(^{-1}\). Calculate its temperature

Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg^-1]

• A. 336W
• B. 450W
• C. 560W
• D. 600W