Students go on camping and making fire from a pile of wood. They gather around the fire to keep warm at night. It is a quiet night, clear sky and no wind. What is the heat transfer method from the fire to the students? (1 point)
One plastic bottle is fully filled with water and the other one is empty. They are tightly closed and kept in a deep freezer. After one or two days, what will be your observations? 2.1 Bottle filled with water will … (0.5 point) 2.2 Bottle kept empty will … (0.5 point)
When a spiral paper was placed above a lighted candle, it started to spin after a short while. Which kind of energy is not relevant to this movement? (1 point)
A force F is applied to an L-shaped rod with length l on each side, which is hinged at P as shown. The force and L-shaped rod are on the same plane. In which diagram will F produce the greatest turning effect? (1 point)
Rank the following materials (at room temperature) according to their sound speed from the lowest to the highest: (1 point) glass mercury air Answer: … < … < …
A picture of electrical wire connecting four resistors is shown as follows. The electrical wire is shielded by a plastic material and there is no short circuits between wires. What is the circuit diagram? (1 point)
A resistance of a copper bar is proportional to its length and inversely proportional to the cross-sectional area. Which of the following has the greatest resistance? (1 point)
Study the electrical circuit. All four bulbs are lighted up. Darcy wants to install a switch so that he is able to switch off TWO bulbs while leaving the rest of the bulbs lighted. Which part of the circuit S, T, U or V should Darcy install the switch? (1 point) Answer: …
The consumption of the top [apex] predators, like shark, is discouraged due to the high accumulation of mercury present in their body, including shark fins. Why would consumption of these fish products be dangerous while it remained safe to consume other fish normally eaten by shark? (1 point)
Bioaccumulation allows mercury to build up in the larger predatory fish.
Smaller fish do not live long enough for mercury to accumulate in them.
Smaller fish is capable of detoxifying the mercury, while the shark lacks the ability.
Unlike smaller fish, the shark skin is made of a matrix of placoid scales, allowing the accumulation of mercury
Gilbert set up an experiment as shown below. Tank A and tank B were placed in the presence of sunlight while tank C and tank D were put into a wooden container. After an hour Gilbert measured the amount of carbon dioxide (CO2) in each tank. Which tank has the least amount of carbon dioxide? (1 point)
Biomass is a fuel that is developed from organic materials, a renewable and sustainable source of energy used to create electricity or other forms of power. Which genes would geneticists introduce into plant cells to generate genetically engineered plants with extra biomass? (1 point)
A. Genes supporting the mitochondrial function.
B. Genes accelerating the formation of plant cell wall.
C. Genes promoting the protein synthesis in cytoplasm.
D. Genes enhancing the accumulation of water in vacuole.
During the recent tsunami disaster a young child was separated from his/her biological parent in Sri Lanka. Years later with the help of a technique, the child was made to reunite with his/her parent. What technique is it? (1 point)
A zoologist caught an insect from a tropical forest in Thailand. Use the dichotomous key provided below to identify the order of the insect. (1 point) 1. One pair of wings … Diptera Two pairs of wings … go to 2 2. One pair of wings is “armor-like” and the other is membranous … Coleoptera Two pairs of wings are membranous … go to 3 3. Fan-like hind wings fold flat under forewings covering most of abdomen … Plecoptera Hindwings fold “roof-like” and are wider at the base than the forewings … Megaloptera
