Basic Technology Examination Questions for Junior Secondary School 3 (Jss3)

Basic Technology Examination Questions for Junior Secondary School 3 (Jss3)

CLASS: JSS3       SUBJECT:  Basic Technology      TIME: 2 ½HOURS

Instructions:        Answer  all questions in SECTION A and FIVE questions in SECTION B. marks will be awarded to neatness in draughmanship . Each question in Section A is followed by four options, choose the correct option for each question and shade the correct answer corresponding to the option you have chosen in your answer sheet.  

PAPER I:

OBJECTIVES TEST

1. All these are engineering materials EXCEPT _____ A. Plastic and rubber Wood   C. Metal   D. Ductility
2. One of the following is NOT a ceramic product Gravel  B. Glass  C. Water closet  D. Tiles
3. Highly developed technology makes use of the following EXCEPT _____ A. Mower Grinding machine  C. Hoe  D. Pay loader
4. In isometric drawing ____ are laid out along the three axes Length and depth  B. Length and width  C. Length and height  D. Length, width and height
5. Drawing paper is placed squarely the drawing board with the aid of _____ A. tee-square  Scale  rule  C. Set-square   D. template
6. Which of the diagram below represent the plan of the object below?
7.                                     C.                         D.

26. Which of these plastics can be remelted A. Plasticine Synthetic  C. Thermoset   D. thermoplastic
27. The angle of inclination of an oblique solid drawing is ____ A. 90⁰ 30⁰  C. 60⁰  D. 45⁰
28. Which of these element emits electrons in diode valve? A. Cathode Heater  C. Triode  D. Anode
29. One of the difference between rubber and plastic is that rubber is more A. Tougher Cheaper  C. Elastic  D. Malleable
30. In the diagram above, the view pointed by the arrow to part “A” is known as _____ view  Plane  B. End  C. Plan   D. Front
31. Identify vertex from the plane figure drawn below
32. The method of boring holes on a material is referred to as ____ A. Forging Drilling  C. Upsetting  D. Casting
33. All of the following are good reasons for wood finished EXCEPT ____
34. Hygiene B. Varnishes C. Decoration   D. Beauty.
35. The following are materials for good wood finished EXCEPT ____ A. Vanishes Polish  C. Valium  D. Creosote
36. Which of the following is a rhomboid
37. B. C.                D.
38. A rectifier is a device used to A. Covert high voltage to low voltage  Convert alternating current to direct current  C. increase current flow  D. Stabilizes flow of electricity
39. Maintenance of all engineering systems is mainly to _____ A. Prevent machine from making noise Allow machine to last forever  C. Keep machine in good working condition  D. Makes the machine to move at high speed
40. Another name for synthetic rubber is A. Plastic Latex   C. Nylon
41. Elastic
42. The electronic device that convert AC to DC is called _____ A. Diode
43. Resistor C. Inductor D. Transistors
44. On the component drawn above letter K represents _____ A. Emitter Base  C. Collector  D. Palarise
45. Electron strucks on material surface to product light is referred to a ____ emission Field   B. Thermonoic  C. Photo   D. Secondary
46. An electronic device that amplifies current in a circuit is called ______ A. Inductor Transistor  C. Diodes  D. Triode
47. The portion on the drawing paper set aside for necessary information such as size, name, date of drawing is called the ____ A. Title block Margin space  C. Information  table  D. Drawing space
48. The hand tool drawn below is basically used for ____ A. Packing Rendering  C. Digging   D. Filing
49. The number of principal planes of projection in orthographic drawing is ____ A. 5 4   C. 3   D. 2
50. Which of the following symbols represents a transistor?

1. B. C.                D.

34. A simple of wood weighs 60g before and 40g after drying. What is the percentage moisture content of the wood? A.250%   150%  C.100%  D. 50%
35. The type of maintenance carried out by a man who often sends his car for servicing is known as ____ A. Corrective Predictive  C. Preventive  D. Overhauling
36. In forged work, the device used in producing heat is called _________ A. Blast furnace Kiln  C. Oven  D. Electric arc
37. A method by which electrons are liberated by the use of light is called ____ A. Secondary emission Photo-electric emission  C. Primary emission  D. Thermionic emission
38. Which of the following is NOT a safety process in the workshop? A. Wear goggle when grinding metal Weld in a well ventilated area
39. Put sharp edge object around working area D. Do not remove chips while machine is on.
40. The figure shown below is ______
41. Polygon Prism  C. Pyramid   c. Tetrahedron
42. Which of the following serves as binding agent in concrete? A. Cement B. Sand Store  D. water
43. The following methods are used for processing plastics EXCEPT ____ A. Calendering Moulding    C. Vacuum D. Injection
44. The purpose of maintenance on engineering equipment is to ____ A. Keep it in god working condition always  Enable it to last forever  C. Prevent it from making loud noise  D. Stop it from working too long

Use the sketch below to answer question 37 and 38

43. The diagram above illustrates _____ system in a vehicle A. Clutch
44. Brake C. Wheel D. Disc
45. The part labeled B is called ___ A. Disc Brake  C. Brakelining
46. Brake fold
47. The device that disconnect or joins two revolving shafts during gear change is called ____ A. Drum Wheel  C. Clutch  D. Axle
48. In the diagram below part P indicates the A. Shaft Clutch  C. Plate  D. Gear box
49. Which of the following is used for hidden details?
50. B.                C.                D.
51. Identify the chord in the circle drawn below
52. The drawing that accurately describes shape and size of an object is a/an ____ projection A. Axonometric Isometric  C. Orthographic  D. Oblique
53. The part marked “X” in the diagram below is
54. Vanishing point B. Station point C. Ground line  D. Picture plane

45. Safety “First” means care of tools and self  B. Care of tools and equipment  C. Care of tools, self and others  D. working procedures
46. The process of breaking a log into marketable size is called ____ A. Conversion felling  C. Lamination  D. Seasoning
47. The following are marking, measuring, testing and setting tool EXCEPT ____ A. Chisel Try square  C. Sliding  level  D. Rule
48. Any substance that is applied between two moving bodies in contact to reduce friction is referred to A. Air Fluid  C. Lubricant  D. Water
49. A straight line is the shortest distance between ____ points. A. Four
50. Three C. Two D. One
51. In the diagram shown below, rotary motion is changed to ____ motion.

1. Angular B. Linear  C. Translatory
2. Oscillatory

SECTION B: THEORY

 ANSWER FOUR QUESTIONS

1a.     Define the term electro-emission in an electric appliance

1. enumerate FOUR types of electronic devices with their uses and symbols.

2a.     Differentiate between the processing of plastics and rubber

1. List THREE methods of processing rubber

3a.     What is Vulcanization?

1. Make a large labeled diagram of an extrusion machine

4a.     Differentiate between screws and fittings

1. Describe THREE types of nails

5a.     What is wood finishing?

1. Write briefly on three national that are used as wood finishing

6a.     Differentiate between internal and external screw heads.

1. Describe THREE types of nails.

PAPER II

PRACTICAL DRAWINGS

ANSWERS ALL QUESTIONS

1. Make a large freehand sketch of a hand trowel
2. Drawn in first angle orthographic projection the block shown below looking through arrow F.E. and show the following views
3. Front elevation
4. End elevation (right and left)

• Plan
  

  ---

3. Construct triangle PQR with sides PQ = 70mm, QR = 63mm, and angle PQR = 60⁰

(a)      What is the length of side PR?

(b)      What is angle QRP?

4. Draw a line AB = 80mm and divide it into eight equal parts.
5. Construct a regular polygon with six sides across flat with sides 30mm each.