Question : Refrigerators keep food unspoiled because
Option 1: at its low temperature bacteria and moulds are inactive
Option 2: at its low temperature, the germs are killed
Option 3: at its low temperature, the germs are frozen
Option 4: it sterilizes the food
Correct Answer: at its low temperature bacteria and moulds are inactive
Solution : The correct option is at its low temperature bacteria and moulds are inactive.
Refrigerators aid in the preservation of food by keeping it at a low temperature, which prevents the development and activity of bacteria, moulds, and other microbes that cause food to deteriorate. The freezing temperature slows down these bacteria' enzymatic and metabolic activities, reducing their capacity to multiply and break down food. Refrigeration helps to increase the shelf life of perishable foods by producing an environment in which bacteria and moulds are less likely to develop and cause foodborne diseases.
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Question : Why boiling point of water decrease at high altitudes?
Option 1: Because of the high temperature
Option 2: Because of low atmospheric pressure
Option 3: Because of low temperature
Option 4: Because of high atmospheric pressure
Question : The boiling point of water decreases at higher altitudes due to:
Option 1: low temperature
Option 2: low atmospheric pressure
Option 3: high temperature
Option 4: high atmospheric pressure
Question : Rhizobium is a kind of:
Option 1: Photosynthetic bacteria
Option 2: Symbiotic bacteria
Option 3: Parasitic bacteria
Option 4: Saprophytic bacteria
Question : Pressure cooker cooks faster because:
Option 1: The boiling point decreases with the rise in pressure.
Option 2: It cooks the food at low pressure.
Option 3: A higher temperature is attained for cooking.
Option 4: The material of the cooker is a good conductor.
Question : The temperature of boiling water in a steam engine may be high because:
Option 1: there are dissolved substances in water
Option 2: there is low pressure inside the boiler
Option 3: there is high pressure inside the boiler
Option 4: the fire is at very high temperature
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