(a) Define nucleon number

(b) A radioactive isotope of Americium (Am —241) decays into a nucleus of Neptunium (Np — 237) and an alpha (\(\alpha\)) particle as shown in the nuclear equation below. \(^{241}_{95}Am\) \(\to\) \(^{237}_{c} + ^b_a \alpha\)

(i) State the number of neutrons in the nucleus of Americium — 241.

(ii) Determine the values of a,b and c.

(c)(i) Why are y-rays not deflected by electromagnetic field?

(ii) State two properties of gamma rays that make them suitable for sterilizing medical equipment.

(d) A sample of radioactive substance was found to be left with h of its initial count rate after 110 years. Calculate its decay constant.

A normal supply curve is usually positively sloped because the relationship between

• A. price and supply is positive
• B. demand and price is positive
• C. supply and price is negative
• D. price and demand is negative

A recurrent problem of Nigerian federalism is

• A. national awareness
• B. acculturation
• C. assimilation
• D. national unity

Which fund is used to meet unforeseen or urgent expenditure

• A. General reserve fund
• B. Consolidated Reserve Fund
• C. contingencies fund
• D. special fund

An advantage of the Second-Tier Securities Market to an economy is in

• A. creating avenues for investment
• B. regulating competition amongst companies
• C. granting financial assistance to consumers
• D. increasing companies profit margins

One of the reasons why wholesaling must continue is that?

• A. the tax paid by wholesalers on their profit enhances national revenue
• B. by creating artificial scarcity, the wholesaler is enhencing competition
• C. the wholesaler provides technical advice to the retailer
• D. the gap between manufacturers and retailers is reduce byn wholesalers

Which of the following vertebrates has the most simple structured heart

• A. reptile
• B. fish
• C. mammal
• D. Amphibian

University of Ilorin was established in September 1975 is an example of ____

• A. Declarative statement
• B. Exclamatory
• C. Interrogative
• D. Command

Which of these is a correct format of Email address?

• A) contact.website.info
• B) contactwebsite.info
• C) contact@website.info
• D) contact@website@info

'Oshor:...Winds howl forth-howl forth,

hold back hold back-is the time- oh

endless time-slung in oblivion,

make minced meat of your prey.

Charity Angya, The Cycle of the Moon.

The literary device used is

• A. parallelism
• B. irony
• C. onomatopoeia
• D. repetition