answel HCUT correct choice on your 1. The planets are thought to have initial gr

Question

answel HCUT correct choice on your 1. The planets are thought to have initial grown into planetesimals through a) accretion b) indentation c) condensation d) differentiation 2. The Earth is closest to the Sun during the month of July. a) True. b) False. 3.--Each element on the periodic table is defined by the number of a) protons b) electrons c) neutrons 4. The appearance or quality of light reflected from the surfa ce of a miner a) color b) luster c) streak d) cleavage Which is the most abundant element in the Earth's crust? a) Silicon b) Oxygen. c) Iron. d) Aluminum.

Explanation / Answer

1. Planetesimals are small fragments of diffused material, formed from ice, dust or rocks which ultimately amalgamated and formed the big giant planets. The process is condensation.

So the right option is c.

2. The Earth is closest to the Sun every year, in early January, about two weeks after the December Solstice, when it is winter for the northern hemisphere and summer for the southern hemisphere. This closest position is known as Perihelion. The distance between the Sun and the Earth is 147.1 million kilometer. On the other hand, we are farthest away from the Sun in the month of July when it is at aphelion position.

So the right option is b (the statement is false).

3. In the periodic table, elements are arranged in order of increasing atomic number, as an element’s physical and chemical property is decided by its atomic number. The atomic number of an element is the number of protons present in its nucleus.

So the right option is a.

4. Luster is an important property for identification of minerals. How a mineral looks like in reflecting light or how much light it reflects is known as the luster of a mineral. Lustre of a mineral can be adamantine, like the diamond, or silky, greasy, metallic. While streak is the color of the powdered mineral, and the color is simply the color of an entire piece of mineral and cleavage is the direction along which a mineral breaks.

So the right option is b.

5. The order of increasing abundance of elements in Earth’s crust is -

Si >O>Al>Fe>Ca>Na>K>Mg

So, the right option is a.

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