Earth MCQ Question and Answer | Geography MCQ Question

61

Which one of the following minerals occurs abundantly in the Earth's crust?

A) Bauxite B) Silica C) Manganese D) Iron

Discuss

Answer & Solution

Answer: Option B

Solution:

Silica, also called silicon dioxide, compound of the two most abundant elements in Earth's crust, silicon and oxygen, SiO2. The mass of Earth's crust is 59% silica, the main constituent of more than 95% of the known rocks.

62

The acceleration due to gravity at the equator

A) Is less than that at the poles B) Is greater than that at the poles C) Is equal to that at the poles D) Does not depend on the Earth centripetal acceleration

Discuss

Answer & Solution

Answer: Option A

Solution:

The effective acceleration of gravity at the poles is 980.665 cm/sec/sec while at the equator it is 3.39 cm/sec/sec less due to the centrifugal force.

63

"Mohs' Scale" is used to indicate the ________

A) Degree of brittleness of a substance B) Degree of hardness of minerals. C) Degree of viscosity of a liquid D) Degree of elasticity of a material

Discuss

Answer & Solution

Answer: Option B

Solution:

Mohs scale is a scale used to measure the relative hardness of a mineral by its resistance to scratching. From softest to hardest, the ten minerals of the Mohs scale are talc (measuring 1 on the scale), gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond (measuring 10 on the scale).

64

The latitude of a place expresses its angular position relative to the place of ________

A) Axis of the earth B) Equator C) North pole D) South pole

Discuss

Answer & Solution

Answer: Option B

Solution:

The latitude of a place expresses its angular position relative to the place of Equator. The latitude of a place expresses its angular position relative to Equatorial Plane.

65

The Earth turns through 360° in 24 hours. Each 15° longitude represents ________

A) Half an hour B) Forty five minutes C) One hour D) One hour fifteen minutes

Discuss

Answer & Solution

Answer: Option C

Solution:

It takes 24 hours for the sun to go through the full 360° around the world, so an hour of time is equal to 15° of longitude.

66

World's longest land border is between which two contries?

A) Australia and New Zealand B) India and China C) Switzerland and Italy D) Canada and USA

Discuss

Answer & Solution

Answer: Option D

Solution:

Canada's border with the United States is the world's longest international border, at 8,890 km.

67

What is the term used for the day on 23 September when day and night are equal throughout the world?

A) Autumnal Equinox B) Astronomical Equinox C) Winter Solstice D) Spring Equinox

Discuss

Answer & Solution

Answer: Option A

Solution:

Equinoxes occurs twice in a year. The day and night on this day are equal through out the globe as the Sun is exactly above the equator on this day. This phenomenon occuring on 21 March is Spring equinox and other occuring on 23 September is Autumnal Equinox as the Sun is heading towards Tropic of Capricorn.

68

When it is noon along 82° 30' longitude, along what degree of longitude it will be 6.30 a.m.?

A) Along 165° E B) Along 67° 30' W C) 0° E or W D) Along 82° 31' W

Discuss

Answer & Solution

Answer: Option C

Solution:

When it is noon along 82° 30' longitude, along 0° E or W degree of longitude it will be 6.30 a.m. The Earth has been divided into 24 time zones of one hour each. Each of these zones covers 15° of longitude.

69

The Gutenberg discontinuity is between ________

A) The crust and the mantle B) The upper and lower mantles C) The outer core and the lower mantle D) The inner and outer cores

Discuss

Answer & Solution

Answer: Option C

Solution:

Gutenberg established an accurate boundary line or discontinuity that separates and divides the lower mantle from the outer core. The lower mantle above the Gutenberg line is solid, but the outer core below the line is liquid molten.

70

The approximate circumference of the Earth is

A) 13,000 km B) 20,000 km C) 25,000 km D) 40,000 km

Discuss

Answer & Solution

Answer: Option D

Solution:

The approximate circumference of the Earth is 40,000 km. The circumference of the Earth in kilometers is 40,075 km, and the circumference of the Earth in miles is 24,901.