(a) Define dffraction.

(b)(i) Explain critical angle. The diagram here illustrates a ray of light passing through a rectangular transparent plastic block \(\alpha\) Determine the value of the critical angle. \(\beta\) Calculate the refractive index of the block.

(c) A pipe closed at one end has fundamental frequency of 200Hz. The frequency of the first overtone of the closed pipe is equal to the frequency of the first overtone of an open pipe. Calculate the:

(i) fundamental frequency of the open pipe;

(ii) length of the closed pipe;

(iii) length of the open pipe. [Speed of sound in air = 330 ms\(^{-1}\)]

(a) Define diffraction.

(b)(i) Explain critical angle. The diagram here illustrates a ray of light passing through a rectangular transparent plastic block \(\alpha\) Determine the value of the critical angle. \(\beta\) Calculate the refractive index of the block.

(c) A pipe closed at one end has fundamental frequency of 200Hz. The frequency of the first overtone of the closed pipe is equal to the frequency of the first overtone of an open pipe. Calculate the:

(i) fundamental frequency of the open pipe;

(ii) length of the closed pipe;

(iii) length of the open pipe. [Speed of sound in air = 330 ms\(^{-1}\)]

Choose the most appropriate optionopposite in meaning of the underlined word.

The government isinitiating new effective programmes to boost production?

• A. ending / enhance
• B. rewiewing / renew
• C. rearranging / increase
• D. terminating / reduce

These question are based on selected poems from Ker, D.et al (eds.)New poetry from Africa; Soyinka, (ed.): Poems of Black Africa; Senanu K.E. and Vincent, T.(eds.): A Selection of African poetry;Umukoro, M et al (eds.): Exam focus:Literature in English: Eruvbetine, A.E.et al (eds): Longman Examination Guide and Nwoga, D.I. (eds.): West African Verse.

As the dancers move through paths strewn with glass chips, the image in Adeoti's Naked Soles change from

• A. inaction to action
• B. pain to grief
• C. sorrow to joy
• D. joy to excitement

A plateau has all the following characteristics except that

• A. it sometimes serves as a watershed
• B. it is higher than the surrounding areas
• C. it is an elevated stretch of land
• D. it has a uniformly flat unbroken surface

The ability of leaders make and enforce decisions in a state is called

• A. sovereignty
• B. political power
• C. socialization
• D. legitimacy

Which of the following is not an attribute of a state?

• A. Definite territory
• B. Population
• C. Government
• D. Common language

From the list of words lettered A to D, choose the one that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentence.

The principal chastised Ben for his use ofcoarse language and advised him to emulate his sister's ________ behaviour.

• A. pure
• B. neat
• C. refined
• D. organised

Government imposes taxes mainly to

• A. punish the citizens
• B. provide social amenities
• C. donates to poorer countries
• D. execute white elephant projects

Find the value of x in the figure below

• A. 20√3cm
• B. 10√3cm
• C. 5√3cm
• D. 4√3cm

'''Follow me and leave the dead to bury their own dead''' By this statement, Jesus means that

• A. disciples shall not attend burials
• B. there is no life after death
• C. following Him comes before anything else
• D. disciples shall leave their families in God's care