r!HFIITIIBIFI Ul'llVERSITY

0F SCIEI'ICE FIFID TECHNOLOGY

FACULTY OF HEALTH AND APPLIED SCIENCES

DEPARTMENT OF NATURAL AND APPLIED SCIENCES

QUALIFICATION:

QUALIFICATION CODE: LEVEL: 4

COURSE CODE: BSC410$ COURSE NAME: BASIC SCIENCE

SESSION: JULY 2017 PAPER: THEORY

DURATION: 3 HOURS MARKS: 100

SUPPLEMETARY/SECOND OPPORTUNITY EXAMINATION PAPER

EXAMINER(S) MR. VAINO INDONGO

DR. EUODIA HESS

DR. LAMECH MWAPAGHA

MODERATOR:PROF HABAUKA KWAAMBWA

INSTRUCTIONS

Write all your answers in the answer booklet provided, use black/blue ink pen only.

Read the whole question before answering.

Begin each question on a new page.PWN!‘ The Periodic Table is attached at the back of this question paper.

PERMISSIBLE MATERIALS

1. Examination script

2. Scientific Calculator

THIS EXAMINATION PAPER CONSISTS OF 10 PAGES

(INCLUDING THIS FRONT PAGE AND PERIODIC TABLE)

SECTION A: BIOLOGY [35]

QUESTION 1 [15]

Question Type: Multiple Choice Questions. Each question equals 1 mark.

1.1 In what way(s) do humans threaten the biosphere and damage ecosystems? (1)

.005”?human population size continues to increase rapidlyhumans clear forests for farmland

humans tend to alter ecosystems

All of these are ways humans threaten the biosphere and damage ecosystems.

1.2 What is a characteristic of living things that sets them apart from the nonliving? (1)

.009”?respond to a stimulus

grow and reproduce

adaptation to a way of life.

All of these are characteristics of living things

1.3 The harmed species in a parasitic relationship is called: (1)

POP“?The occupant

The parasite

The host

The Receptor

1.4 An obligatory association between two different species that is beneficial to both populationsof organisms is (1)

90¢?symbiotic.

parasitic.

predatory.mutualistic.

1.5 Which of the following is the least function of proteins? (1)

.0093?growth of new cells

repair of damaged cells

manufacture of antibodies

production of energy.

1.6 Which of the following statements is true? (1)

pop»Symbiosis refers to different organisms living together.Members of a symbiotic relationship cannot live without each other.

Symbiosis refers to different organisms living together and benefiting from each other.

A parasite is not in a symbiosis with its host.

1.7 Prokaryotic organisms make up the;

1.8

1.9

1.10

1.11

1.12

.0093?Archaebacteria, Protists and Eubacteria

Archaebacteria and Eubacteria

Protists and Eubacteria

Protists

As a practical definition of species, one can say that they are a group of organisms

characterised by all of the following except they;

.0090?do not normally interbreed with other species in nature

can be distinguished from other species

are incapable of hybridization with other species

All the above

In gymnosperms, pollination is exclusively by;

POP”?wind

animal

insects

all the above

True multicellularity occurs only in;

.0093?eukaryotes

plants, animals and fungi

plants and animals

plants, animals and protists

The conversion of nitrogen to ammonia or nitrogenous compounds is known as?

.0090?Nitrification

Nitrogen assimilation

Denitrification

Nitrogen fixation

The three macronutrients are

pops?lipids, carbohydrates, proteins

monosaccharide, polysaccharide, disaccharide

fibre, vitamins, proteins

carbohydrates, lipids, glycerol

(1)

(1)

(1)

(1)

(1)

(1)

1.13 Unsaturated fats (1)

have double bonds in their fatty acid chains

are more common in animals than in plants

are associated with greater health risks than are saturated fats.0090? are usually solid at room temperature

1.14 You might find methanogens: (1)

in marshes

in a cow's stomach

in swamps

all of the above.0090?1.15 Which of the following is NOT a fat-soluble vitamin? (1)

Vitamins A

Vitamins B

Vitamins D

Vitamins K.0090?QUESTION 2 [10]

Question Type: Structured Questions.

2.1 Define the term ’autotrophs’ and 'heterotrophs’ giving an example of each. (2)

2.2 State the FOUR economic importance of Conifers Plants (4)

2.3 The African elephant is one of the endangered animals in the whole. Describe the word

endangered and give at least THREE reasons why animals become endangered or extinct. (4)

QUESTION 3 [10]

Question Type: Structured Questions.

3.1 List FOUR general features that characterise protista. (2)

3.2 Complete Table 1. (4)

Table 1

Micronutrient Deficiency disease/signs Food source

Vitamin A (I) ............................. Milk, liver

Vitamin C Bleeding gums (ll) .................................

(III) ........................... Goiter Liver

Calcium (IV) .............................. Milk

3.3 Briefly discuss the primary and secondary stages of wastewater treatment.

SECTION B: CHEMISTRY

QUESTION 4

Multiple choice questions. Each question weighs 1 mark.

4.1 The amount of space taken up by an object is known as

A.Volume

B. Mass

C. LengthD.Area

4.2 Which of the following instruments is used to measure weight?A.Balance scale

B.Spring balance

C. Barometer

D.Opisometer

4.3 How many significant figures does the following measurement contain?

Temperature = 0.0023 °C

.0090? H-bUJN4.4 What is the result of the following calculation, reported to the correct number

of significant figures?

9.428/ 4.26 mL = ?

2.213 g/mL2.21 g/mL2.0 g/mL2.20 g/mLPOP“?

4.5 Solid carbon dioxide has a temperature of —78 °C. What is this temperature

on the Fahrenheit scale?

A. 25.5 °F

B. -108.4 °F

C. -61.11 °F

D. -109 °F

(4)

[35]

[6]

(1)

(1)

(1)

(1)

(1)

4.6 Solid Carbon dioxide has a temperature of -78 °C. What is this temperature

on the Kelvin scale? (1)

195 K

195.15 K

195.2 K

195.1 K.0090?QUESTION 5 [29]

5.1 Classify each of the following as intensive or extensive property. (4)

a. Densityb. Magnetic attraction

c. Boiling Point

d. Volume

5.2 State whether each of the following changes in the state of matter is a physical or chemical

change. (5)

a. Ironing a shirt

b. Decomposition of organic matter

c. Fermentation of sugar

d. Distillation of crude oil

e. making a cup of tea

5.3 Classify each ofthe following as an element, compound, homogeneous or heterogeneousmixture: (3)

a. air you breath

b.Table salt

c. a cup of coffee

5.4 Name the process when the following changes in the state of matter occur and

indicate whether the change in state is an endothermic or exothermic

process. (8)

a. Gas into Solid

b. Liquid into Solid

c. Solid into Gas

d. Gas into Liquid

5.5 Use your knowledge of the atom to complete the following table.

Element name Symbol #p+ #e‘ #n0 Charge

(atom or ion)

Argon 20

Potassium ion 39 19 18

K+1

19

sulphur ion 16 -2

SECTION C: PHYSICS

QUESTION 6

Question Type: Multiple Choices. Each answer equals 1 mark.

6.1 A police man sends out radar waves with a 3.4 cm wavelength from his police car with a

speed of 3 x 108 m/s. What is their frequency?

8.82 x 109 Hz

2.88 x 109 Hz

8.28 x 109 Hz

8.82 x 106 Hz.0090?6.2 Which of the following is NOT an example of a transverse waves?

water waves

5 earthquake waves

sound waves

rope waves.0091»6.3 The amplitude of a wave can be described as

the displacement of the size of the disturbance

the distance of a repeating unit

how fast the waves travels

the cycle of the waves.0092?6.4 A type of energy source formed from the fossilised remains of pre—historic

plant and animal material is called

A. fossil fuels

B. biomass

C. biofuels

D. geothermal

(9)

[30]

[10]

(1)

(1)

(1)

(1)

6.5 Energy produced by the oceans as a result of movements of water flowingback and forth is called

A. geothermal energy

B. heat energy

C. hydroelectric energy

D. tidal energy

6.6 A gas produced by burning fossil fuels and cause ’greenhouse effect’ is known

as

sulphur dioxide

natural gas

oxygen

carbon dioxidePOP”?6.7 An apple of mass 23 g falls from a tree at 5 m height. What is the potential energy of an

apple? Assume that the gravitational acceleration of the earth is 9.8 m.s'2.

3 Joules

2jou|es1.127 Joules

0.82 Joules.0090?6.8 The following nuclear equation shows a nuclide undergoing beta decay.

What is the new nuclide formed indicated by the letter X:

146C _) 147)( + °_1eCarbon

Nitrogen

Helium atom

Sulphur.0093?6.9 When a radionuclide undergo alpha decay, its mass number decreases by

and atomic decreases by

2and4

3and4

4and2

landO.0090?

(1)

(1)

(1)

(1)

(1)

6.10 A contact force acting in the opposite direction when an ink pen is slid on the surface of the

book is known as

Friction

Magnetic force

Applied force

Tension.005»?(1)

QUESTION 7

7.1 The equation for the alpha decay of Ra-226 is given by;

22

688Ra ”‘dx + 42He

[9]

Determine the values of m and cl and give the name of the new element X that is formed after

the decay?

7.2 Define radioactive isotope.

7.3 Complete the table.

(3)

(1)

(5)

Types of Penetrating power Magnetic Deflection What is it

Radiation with magnet

Gamma (i) .................. (ii) .................. Electromagneticwave.

Very short wave

length

Very high energy

(iii) ............... Goes through thin Large deflection High energy

paper electrons (negative

charged)

(iv) ................ Will not go thin (v) ............... Positively charged

paper. Can be helium nucleus 4zHe

stopped by few

mm of metal.

QUESTION 8 [11]

8.1 Define the following terms: (2)a. Newton’s first law

b. longitudinal wave

8.2 List three effects that a force when applied, can have on an object moving at a constant

velocity. (3)

8.3 The average percentage of six groups after their first semester examination is as follows:

Group 1 with 21%, Group 2 with 9%, Group 3 with 42%, Group 4 with 37%, Group 5 with 54%

Group 6 with 60%.

Use the data to draw a column graph of average percentage against group number. (6)

END OF EXAM!!!!!!!!

PERIODICTABLEOFTHEELEMENTS

1

18

1

2

H

He

1.00794

2

‘3

14

‘5

16

'7

4.00260

10

3

4

5

6

7

8

9

10

Li

Be

B

C

N

0

F

Ne

6.941

9.01218

10.81

12.011

14.0067

15999418998420.179

11

12

13

14

15

16

17

18

Na

Mg

Al

Si

P

S

Cl

Ar

22.989824.305

3

4

5

6

7

8

9

10

11

12

26.981528.085530.9738

32.06

35.453

39.948

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

K

Ca

Sc

Ti

V

Cr

Mn

Fe

Co

.

Ni

Cu

Zn

Ga

Ge

As

Se

Br

Kr

39.0983

40.08

44.9559

47.88

50.941551.996

54.938055.847

58.9332

58.69

63.546

6538

69.72

72.59

74.9216

78.96

79.904

83.8

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

Rb

Sr

Y

Zr

Nb

Mo

Tc

Ru

Rh

Pd

Ag

Cd

In

Sn

Sb

Te

I

Xe

85.4678

87.62

88.9059

91.22

92.9064

95.94

(98)

101.07

102.906

106.42

107.868

112.41

114.82

118.69

121.75

127.6

126.9

13129

55

56

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

Cs

Ba

Lu

Hf

Ta

W

Re

Os

Ir

Pt

Au

Hg

T1

Pb

Bi

Po

At

Rn

132.905

137.33

174.967178.49

180.948

183.85

186207

1902

19222

195.08

196.967200.59

204383

2072

208.908

(209)

(210)

(222)

87

88

103

104

105

106

107

108

109

110

111

112

114

116

118

Fr

Ra

Lr

Rf

Db

Sg

Bh

H3

Mt

Uun

Uuu

Uub

Uuq

Uuh

Uuo

(223)

226.025

(260)

(261)

(262)

(263)

(264)

(265)

(268)

(269)

(272)

(269)

Lanthlflidwl

57

58

59

60

61

62

63

64

65

66

67

68

69

70

La

Ce

Pr

Nd

Pm

Sm

Eu

Gd

Tb

Dy

Ho

Er

Tm

Yb

138.906140.12140.908144.24(145)

15036

151.96

157.25

158.925

162.5016193016726166.9314173.04

Actinides:

89

90

91

92

93

94

95

96

97

98

99

100

101

102

Ac

Th

Pa

U

Np

Pu

Am

Cm

Bk

Cf

Es

Fm

Md

No

227.028232.038231.036238.029237.048

(244)

(243)

(247)

(247)

(251)

(252)

(257)

(258)

(259)