Waec 2020 Ghana Interscience Question & Answers Now Posted

2020 INTERNATIONAL WASCE INTERSCIENCE OBJ & THEORY ANSWERS

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2020 WASSCE INT. SCIENCE OBJECTIVE SOLUTION

1-10 .CACDDABCDC

11-20 DABABCCBCC

21-30 BDDCAACDCD

31-40 BBDDBDCDCD

41-50 BADADDAADC

1ai )

physical

Chemical

Biological

aii)

Temperature changes can also contribute to mechanicalweathering in a process called thermal stress. Changes intemperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens

1b) loading👇🏾👇🏾

1c) NACL, Li2CO3, (NH4)3PO4

cii) -Electrovalent compounds are generally soluble in water and insoluble in solvents such as kerosene, petrol, etc.

-Solubility.

-They have high melting and boiling points. …

-Melting. …

-These are solids and are somewhat hard because of the strong force of attraction between the positive and negative ions. ..

(choose any2)

1di)

Rhesus

(Rh) factor is an inherited protein found on the surface of red blood cells. If your blood has the protein, you’re Rh positive. If your blood lacks the protein, you’re Rh negative

dii)

Blood cells from an Rh-positive fetus canenter your bloodstream during pregnancy and trigger the development of these antibodies. This can happen late in pregnancy or during delivery and also may happen if you have amiscarriage, abortion, or ectopic pregnancy.


No 2)

Solar-powered photovoltaic (PV) panels convert the sun’s rays into electricity by exciting electrons in silicon cells using the photons of light from the sun. This electricity can then be used to supply renewable energy to your home or business.

aii)

-As heat for making hot water, heating buildings and cooking.

-To generate electricity with solar cells or heat engines.

-To take the salt away from sea water.

-To use sun rays for drying clothes and towels.

-It is used by plants for the process of photosynthesis

(choose any 2)

2bi)

Our drinking water comes from lakes, rivers and groundwater. For most Americans, the water then flows from intake points to a treatment plant, a storage tank, and then to our houses through various pipe systems. (Still coming to this don’t write first)

2ci)

– Practice Seasonal Soil Rotation

-Early planting

– Always Scout Your Fields

 2cii)

PRACTICE SEASONAL SOIL ROTATION

When you are planting season-by-season, it is important to understand how planting recurring crops can affect your overall yield. Planting corn in consecutive years has been proven to be less effective for optimal yields.

– EARLY PLANTING

Choosing the right time to plant is often the most important part of planting. The best strategy to use to increase yields is: if your soil is ready, start planting.

2di)

-EROSION

– STORM

-HURRICANE

choose any 2

2dii)

-Power your home with renewable energy. …

-Weatherize, weatherize, weatherize. …

-Invest in energy-efficient appliances. …

-Reduce water waste. …

-Actually eat the food you buy—and make less of it meat. …


3ai)

Aluminium is actually far more prone to Oxidation (rusting) than Iron is. ButAluminium instantly forms a very thin layer ofAluminium Oxide Al2 O3 on the surface. This layer then protects the bulk of the metal from further Oxidation.

3aii)

greasing

Alloying

Plating..


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