B.E.C.E. Practice Test 6 - Integrated Science (Paper 1)

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1. Which of the following devices uses transistors?

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Box iron

Stop clock

Compact light bulb

Stereo system

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2. The process by which a semiconductor material of a bipolar transistor is given special properties is termed

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electroplating

doping

soldering

binding

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3. A bipolar transistor is said to operate in the 'cut off' region when

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the base-emitter voltage is too small for any significant current to flow

the base-emitter voltage is too large for any significant current to flow

the base-emitter voltage is extremely large for any significant current to flow.

the base-emitter voltage is equal to the alternating current

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4. The electronic component illustrated below is a/an

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capacitor

inductor

transistor

vacuum tube

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5. Which of the following statements about the p-n junction is false?

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It permits current to flow in one direction only.

It permits current to flow in two directions.

When an external voltage is applied to the p-n junction, it acts as a recifier.

The p-n junction is also called a diode.

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6. Biasing a bipolar transistor means

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applying AC voltages to the transistor

applying AC current to the transistor

applying DC voltages to the transistor

applying no voltage to the transistor

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7. Electrical conductivity in the NPN transistor tends to be faster than the PNP transistor because

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there is a higher electron mobility

there is a lower electron mobility

there is a higher hole mobility

there are no electrons

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8. When the p-n junction is reverse bias

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current flows from the p-type to n-type.

no current flows from the p-type to n-type.

current flows from the n-type to p-type.

conducttion of current occurs.

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9. Which of these is an indirect source of light?

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Torch light

Sun

Fire

Moon

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10. A plane mirror can be described as opaque because it

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absorbs all the light incident on it

reflects all the light incident on it

allows all the light incident on it to pass through it

partly absorbs and partly allows the light incident on it to pass through it

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11. Which of the following statements about light is true?

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Light is reflected from polished surfaces.

Light travels through opaque objects.

Light passes through plane mirrors.

The speed of light is less than that of sound.

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12. An object is placed 20 cm in front of a plane mirror. The distance between the object and the image is

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20 cm

40 cm

60 cm

80 cm

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13. At what velocity does light travel?

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400,000,000 m/s

300,000,000 m/s

200,000,000 m/s

100, 000,000 m/s

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14. The direction of the path taken by light is called

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beam

wavelength

wave

ray

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15. Which of these is true about an image formed by a pinhole camera? The image is

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virtual

upright

diminished

erect

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16. When light travels from a less dense medium to a denser medium

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its speed is increased

its speed is reduced

its speed remains the same

its speed is doubled

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17. An optical illusion is

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a false image of an object

a real image of an object

a true image of an object

a virtual image of an object

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18. Which of the following colours is secondary?

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Red

Green

Blue

Cyan

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19. A mirror is used to direct the sun's rays onto the classroom wall by

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radiation

reflection

conduction

convection

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20. Light that is produced by manufactured objects and thus can be controlled is best described as

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natural light

aritificial light

created light

manufactured light

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21. Which of the following beams of light meet at a point?

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Converging beam

Parallel beam

Diverging beam

Straight beam

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22. In forming a virtual image

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the rays of light from the object never meet

the rays of light from the object meet at a point

the rays of light from the object partially meet

the rays of light from the object diverge

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23. One advantage of the conventional camera over the pinhole camera is that

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it has no lens

it requires less time of exposure

it requires more time of exposure

the image formed is laterally inverted.

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24. Eclipse of the moon is also known as

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solar eclipse

annular eclipse

lunar eclipse

partial eclipse

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25. At times, during an eclipse, the tip of the umbra fails to reach the earth's surface. In such a case we have

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eclipse of the sun

partial eclipse

eclipse of the moon

annular eclipse

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26. A spectrum of white light which is created when sunlight passes through drops of water is termed

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umbra

rainbow

eclipse

rectilinear propagation

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27. A stick placed in water appears bent because light travelling from the water to the air is

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dispersed

refracted

displaced

reflected

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28. Distribution in agricultural marketing means

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separating produce into groups of uniform sizes

buying produce from several farmers in order to get a larger quantity

sending produce where it is wanted

arranging produce in a container for the market

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29. Which of the following methods of food preservation results in significant weight loss of crop produce?

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Drying

Pickling

Canning

Freezing

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30. Grading of agricultural produce before marketing means

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bringing produce from the scattered farms together

removal of rotten produce from the bulk

grouping produce into equal sizes and weights

enclosing produce in containers

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31. One reason why land selected for farming must be close to the farmer is that

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it ensures that customers reach the farm with ease

it ensures that pests easily attack the crops

it enables the farmer to protect the farm from thieves

it enables thieves to get to the farm easily

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32. Which of the following activities is a cultural practice in crop production?

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pest control

pricking out

hardening off

nursing seeds

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33. Agro-chemicals used in controlling weeds are called

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fungicides

herbicides

insecticides

pesticides

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34. One important purpose of earthing-up in crop production is to

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control pest attack

enhance soil aeration

promote early fruiting

prevent plants from dislodging

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35. Pruning of plants refers to

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removing young seedlings from seed boxes to trays

spacing out seedlings on the field to promote growth

cutting away parts of plants and trees in order to control growth

sowing seeds directly onto the field

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36. The best tool used in stirring a vegetable bed is the

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shovel

hand fork

hand trowel

cutlass

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37. Which of the following vegetable crops produces fruits?

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Shallot

Lettuce

Egg plant

Cauliflower

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38. Cassava is commonly propagated by

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grafting

leaf cutting

root cutting

stem cutting

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39. The method whereby seeds are sown and allowed to germinate and grow to maturity at the same place is termed

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nursing

staking

planting at stake

earthing up

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40. The most suitable tool for transplanting vegetable seedlings from the nursery to the permanent bed is the

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hoe

hand trowel

dibber

hand fork

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