CSS 2013 General Science and Ability MCQs

Question 6. The biggest species of the cat family is: (CSS 2013)

1. Tiger  

2. Lion

3. Leopard

4. None of these

Question 7. Which group of animals has heterogametic females? (CSS 2013)

1. Domestic fowl

2. Earthworm

3. Rabbit

4. None of these

Question 8. The dominant phase of life cycle in these organisms is haploid: (CSS 2013)

1. Mosses

2. Bacteria

3. Protozoa

4. None of these

Explanation — The dominant part of the life cycle of algae and fungi is haploid. In the life cycle of algae and fungus, a haploid phase alternates with a diploid phase. The haploid phase ends with nuclear fusion, and the diploid phase begins with the formation of the zygote (the diploid cell resulting from the fusion of two haploid sex cells).

Question 9. The atmosphere of moon consists of: (CSS 2013)

1. 90% Hydrogen, 10% Nitrogen

2. 80% Nitrogen, 20% Hydrogen

3. 60% Nitrogen, 40% inert gases

4. None of these

Explanation — The lunar atmosphere is composed largely of helium, neon, argon, and hydrogen. Some molecules of ammonia, methane, potassium, sodium, and carbon dioxide may exist as well. The mass of this thin atmosphere is a few thousand kilograms.

Question 10. The chemical name of quartz is: (CSS 2013)

1. Silicon Dioxide

2. Stannous oxide

3. Aluminium Oxide

4. None of these

Explanation — Quartz is the second most common mineral in Earth’s crust. Its chemical name is SiO2. Although quartz is common, it is usually twinned so industries often Silica; Also known as the silicon dioxide, has a white powdery substance solid.

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