JAMB Geography Past Questions & Answers - Page 53

261.

If the scale of two maps are (a;1:100,000 and b;1:400,000) what is the ground distance if the distance between two towns on the maps is 10cm

A.

10km, 40km

B.

5km, 20km

C.

2.5km, 10km

D.

20km, 80km

Correct answer is A

map distance = 10cm, ground distance = ?
Map scale for (a) 1:100,000
Ground distance = 10 x 100,000/100,000 =10km
Map scale for (b) 1:400,000
Ground distance = 10 x 400,000/100,000 =40km

262.

If the scale of a map is 2cm to 1km, what is the ground distance if the distance between two towns on the map is 20cm

A.

5km

B.

2.5km

C.

10km

D.

20km

Correct answer is C

map distance = 20cm, ground distance = Y
map scale = 2cm to 1km
since 2cm ≡ 1km
20cm ≡ Y
2Y = 20km
Y = 20km/2=10km
The ground distance between the two towns is 10km

263.

The correct arrangement of the layers of the earth crust from the surface to the interior is

A.

sial, mantle, sima, core

B.

sima, sial, core, mantle

C.

core, mantle, sima and sial

D.

sial, sima, mantle and core

Correct answer is D

The crust is subdivided into the upper part, containing minerals like silica, iron and magnesium(sima). The mantle is found beneath the crust and the core is surrounded by the mantle. Hence, the correct arrangement of the layers of the earth crust "sial, sima, mantle and core" from the surface to the interior.

264.

Which of the following is an importance of the atmosphere to living organisms?

A.

It provides water for industrial uses

B.

It provides oxygen for animals and plants for respiration

C.

It provides shelter in form of timber for man

D.

It aids transportation through construction of roads and railways

Correct answer is B

option A is an importance of the Hydrosphere
option C is an importance of the Biosphere
option D is an importance of the Lithosphere
The Atmosphere is the gaseous portion of the earth. It is associated with the provision of gases required by living things e.g oxygen for combustion and respiration, nitrogen for protein synthesis by plants etc.

265.

The outer structure of the earth is made up of the following except?

A.

Mesosphere

B.

Atmosphere

C.

Biosphere

D.

Hydrosphere

Correct answer is A

The atmosphere, biosphere and hydrosphere are all outer structure of the earth. The Mesosphere also known as the mantle is an internal structure of the earth which is found beneath the crust and surrounds the core(Barysphere)