La yukallifu Hahu naf san illa wusaha' This quotation is part of

• A. Surat al Alaq
• B. Surat al Ala
• C. Ayat al kuray
• D. Ayat Amanar Rasul

ai. State the reason why simple harmonic motion is periodic.

ii. State two factors that affect the period of oscillation of a simple pendulum.

iii. Sketch a graph of the total mechanical energy, E, against displacement, y, for the motion of a simple pendulum from one extreme position to the other.

b. The diagram below illustrates an oscillatory pendulum. Calculate the work done in raising the pendulum to point B, if the mass of the bob is 50 g.

[g = \(10 ms^2\)]

c. A spiral spring of spring constant, k, and natural length, l, has a scale pan of mass 0.04 kg hanging on its lower end while the upper end is firmly fixed to a support. When an object of mass 0.20 kg is placed on the scale pan, the length of the spring becomes 0.055 m and when the object is replaced with another object of mass 0.28 kg, the length of the spring becomes 0.065 m. Calculate the values of k and l.

[g = \(10 ms^2\)]

Select the option that best explains the information conveyed in the sentence. The Governor parried all the questions put to him by the journalist?

• A. The governor answered all the questions brilliantly
• B. The Governor evaded all the questions
• C. The Governor failed all the questions
• D. The Governor mastered all the questions

When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?

• A. negative charges flows to the ground through the person's body
• B. positive charges flow from the ground through his body to neutralize the negative charges
• C. positive charges in the air neutralizes the negative charges the person is holding
• D. negative charges will leak through the air

The least geographical factor that determined town sites in the past was the?

• A. existence of fertile alluvial plains
• B. presence of indented coastlined C. existence of communication networks from waves
• C. existence of communication networks
• D. presence of a river gorge

When did the Israelites say 'All that the Lord has spoken we will do?

• A. After Joshua
• B. At mount Sinai
• C. When Moses spoke to them before his death
• D. After the incident of the golden calf

The functions of political parties include the following except

• A. being brokers of ideas
• B. influencing policies of the government
• C. educating the electorate by clarifying issues
• D. disseminating information to members

(a) When nitrogen (atomic mass = 14, atomic number = 7) is bombarded with neutrons, the collisions result in disintegrations in which alpha particles are produced. Represent this transmutation in a symbolic equation.

(b)(i) How does a radioactive atom differ from a stable one?

(ii) Explain 'half life'.

(iii) A sample of radioactive material has a haft life of 35 days. Calculate the fraction of the original quantity that will remain after 105 days.

(c) Light of wavelength 5.00 x 10\(^{-7}\)m is incident on a material of work function 1.90 eV. Calculate

(i) photon energy.

(ii) kinetic energy of the most energetic photo electron.

(iii) stopping potential [Plancks constant h =6.6 x 10\(^{-34}\)Js] [c= 3.0 x10\(^8\)ms\(^{-2}\), leV= 1.6 x 10\(^{19}\)J]

Loss of farmlands can be attributed to all the following except

• A. desertification
• B. gully erosion
• C. laterization
• D. sedimentation

The system of measurement of national income as the sum of all final demands is called?

• A. income approach
• B. expenditure approach
• C. value-added
• D. final demands approach