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Science part 1

1. Which of the following statements best describes a hypothetical element with an electron configuration of 1s22s22p63s23p5?
a. The hypothetical element has an atomic number of 11.
b. The hypothetical element is a member of Group V, otherwise called the Nitrogen Group.
c. The hypothetical element is in the fifth position in the p-block, along the third period of the periodic table.
d. The hypothetical element is located at the third position of the p-block, along the fifth period of the periodic table.

2. Despite the observed diversity among organisms, they  are all made from the same set of biomolecules composed of monomeric units except:
a. Proteins
b. Carbohydrates
c. Nucleic Acids
d. Lipids and Fats

3. What will be formed when radium isotope, with 88 protons and 138 neutrons undergoes alpha decay?
a. Radon Atom (Rn222) with 86 Protons
b. Francium Atom (Fr222) with 87 Protons
c. Actinium Atom (Ac222) with 89 Protons
d. Thorium Atom (Th232) with 90 Protons

4. Which of the following examples best illustrates application of Boyle’s Law?
a. A tire becomes harder as more air is pumped into it.
b. A sealed aerosol can explodes when thrown into a fire.
c. A balloon expands and bursts when exposed to direct sunlight.
d. A scuba divers stops at certain depths as he ascends to the ocean’s surface.

5. Three liquids A, B, C were studied in a laboratory. Liquid A was found to float over B and C. It was also found that liquid A flows fastest among the three. What can be said about liquid A?
a. Densest and most viscous
b. Densest and least viscous
c. Least dense and most viscous
d. Least dense and least viscous

6. Which of the following statements represents a physical change?
a. An antacid tablet forms bubbles when dissolved in water.
b. A flashlight beam slowly gets dimmer and finally dies out over time.
c. The lawn grows thicker every day because fertilizers were added into the soil.
d. Frozen mango juice melted when left standing at room temperature for 30 minutes.

7. Which of the following best explains why farmers burn rice straw and hull during seasons of harvest?
a. Burning rice hulls and straws produce compounds that act as repellant for pests which may damage plantation.
b. The smoke produced by burning rice hulls and straws stimulate growth and fruit bearing of trees.
c. Rice hulls and straws are burned so that more spaces will be available for planting next set of crops.
d. Ash from burnt rice hulls and straws are rich in compounds that could neutralize acidic soil so that  more crops will grow

8. Acid rain occurs when _________.
a. carbon dioxide combines with water in the atmosphere.
b. phosphorus-rich water in lakes evaporates to form phosphoric acid.
c. sulfur released in burning fossil fuels combines with water in the atmosphere.
d. excess hydrogen is released into the atmosphere to produce acids.

9. Why is it difficult to integrate nitrogen gas from the atmosphere into the nitrogen cycle of the biosphere?
a. Nitrogen is very abundant in the atmosphere
b. Living organisms quickly absorb nitrogen gas
c. Oceans quickly absorb nitrogen gas
d. Few organisms can directly utilize atmospheric nitrogen

10. Which of the following sentences about greenhouse effect is INCORRECT?
a. Greenhouse gases trap heat in the atmosphere which are returned to the earth’s surface.
b. Greenhouse effect is important in maintaining the temperature of the earth.
c. Greenhouse effect is due to gases that absorb the green region of light from the sun.
d. Greenhouse effect increases the overall surface temperature of the earth.

11. When a gardener propagates a plant by taking cuttings, he plants his cutting in a well-watered soil in a plant pot. What is the most likely reason why he may then cover the plant and pot with a lightly perforated polythene bag?
a. To reduce the water demand of the cutting.
b. To decrease the rate of gaseous exchange by the plant.
c. To reduce the chance of attack by pests.
d. To protect the plant from cold weather.