Question
1. A natural phenomenon that illustrates the dispersal of light is A. an echo. B. an eclipse. C. a rainbow. D. a rainfall. 2. Canned foods and drinks have expiry dates on them. The hazard involved in taking an expired drink is A. food poisoning B. impaired hearing. C. suffocation. D. poor circulation of blood. 3. Which of the following sets of devices operate on the principle of magnetism? A. Louds peakers, compass, alarms B. Loudspeakers, alarms, LCD TV C. Compass,loudspeakers, LCD TV D. Compass, alarms, LCD TV 4. A hunter experiences a backward force upon firing a gun. Which of the Newton's laws of motion is demonstrated in the situation? A. First law B. Second law C. Law of inertia D. Third law 5. A bowl of water on a gas stove was initially cold. It became warm after sometime. What was the mode of heat transfer in the water? A. Conduction B. Radiation C. Convection D. Emission
Answer
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(194 Votes)
Nigella
Elite · Tutor for 8 years
Answer
### 1. C. a rainbow### 2. A. food poisoning### 3. A. Loudspeakers, compass, alarms### 4. D. Third law### 5. C. Convection
Explanation
## Step1: Identify the natural phenomenon illustrating the dispersal of light### A rainbow is a natural phenomenon that illustrates the dispersal of light, as it occurs when light is refracted, dispersed, and reflected in water droplets.## Step2: Identify the hazard of consuming expired drinks### The hazard involved in taking an expired drink is food poisoning, which can occur due to the growth of harmful bacteria or toxins in the expired product.## Step3: Identify devices operating on the principle of magnetism### Loudspeakers, compass, and alarms operate on the principle of magnetism. LCD TVs do not rely on magnetism for their operation.## Step4: Identify the Newton's law demonstrated by the backward force experienced when firing a gun### The backward force upon firing a gun demonstrates Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction.## Step5: Identify the mode of heat transfer in water heated on a gas stove### The mode of heat transfer in the water is convection, as the heat is transferred through the movement of the heated water molecules.