Correct Answer: D. Sahel savannah

Correct Answer: A. prolactin

Correct Answer: D. Judicial Service

Correct Answer: D. dirge

Correct Answer: B. pectoral and pelvic girdles

Explanation

(a)

\(2r + 24.2 = 52.2\)

\(2r = 52.2 - 24.2 = 28\)

\(r = 14 cm\)

\(|AB|^{2} = OA^{2} + OB^{2} - 2(OA)(OB) \cos <AOB\)

\(24.2^{2} = 14^{2} + 14^{2} - 2(14)(14) \cos < AOB\)

\(\cos < AOB = \frac{14^{2} + 14^{2} - 24.2^{2}}{2(14)(14)}\)

\(\cos < AOB = \frac{392 - 585.64}{392}\)

= \(\frac{-193.64}{392}\)

\(\cos < AOB = - 0.4940\)

\(< AOB = \cos^{-1} (0.4940)\)

= \(119.6° \approxeq 120°\)

(b) Volume of water in the tank = \(\frac{1}{2} \times l \times b \times h\)

= \(\frac{1}{2} \times 60 \times 80 \times 100\)

= \(240000 cm^{3}\)

Number of litres of water = \(\frac{240000}{1000}\)

= \(240 litres\)

Correct Answer: C. Will she send a shirt to him today?

Explanation

The sentence 'She will send a BAG to him today.' is a response to the question 'Will she send a shirt to him today?'. The emphasis on 'BAG' indicates that she will not send a shirt, but a bag to him today.

Correct Answer: B. hyperbole

Correct Answer: C. allegation

Explanation

The word 'claim' in the context of the sentence refers to an assertion of the truth of something, typically one that is disputed or in doubt. This is closely related to the concept of 'allegation', which is a claim or assertion that someone has done something illegal or wrong, typically one made without proof.

Explanation

(a)(i) The common name given to group VII elements is Halogens.

(ii) Hydrides of the first two elements in group VII: (1) Hydrogen fluoride (2) Hydrogen chloride.

(iii) Three chemical properties of group VII elements are: (1) High electron affinity/strong oxidation 4-gents/electron acceptor. (2) High electronegative (3) React with hydrogen to form acid. (4) Form salts with metals. (5) React with alkalis to form salts. (6) React with water to form acids. (7) Displacement of lower halogens from their acids/salts. (8) Reacts with hydrocarbons to form alkyl halids.

(b) Copy and complete the following table:

(c)(i) Define the following processes: I. Nuclear fission – splitting of a heavy nucleus into smaller nuclei (of smaller mass) with release of (large amount of) energy and radiations. II. Nuclear fusion –combination of smaller nuclei to form a large nucleus with the release of (large amount of) energy and radiation.

(ii) Give one use of each process in (c)(I). I. Used to generate electricity/nuclear or hydrogen bomb/ production of new elements/production of radioisotopes. II. Used to produce nuclear weapon/ atomic or hydrogen bomb/production of new elements/production of radioisotopes.

(c)(i) List three types of radiation that are produced during radioactivity: (1) alpha (2) beta (3) gamma.

(d)(ii) Arrange the radiation listed in (d)(i) in order of increasing:

I. Penetrating power — \(\alpha\), < \(\beta\) < \(\gamma\)

II. Ionizing power — \(\gamma\) < \(\beta\) < \(\alpha\)