Basic Left Flashcards
(63 cards)
What is a major problem with using hard water in boilers?
It forms limescale (calcium/magnesium deposits) which reduces heat conductivity and can lead to overheating and tube failure.
How can hard water negatively affect irrigated crops if untreated?
It can leave a calcium carbonate coating (calcite) on roots and leaves, hindering the absorption of water, minerals, and fertilizers.
What is silica gel commonly used for, often found in small paper packets?
As a desiccant to absorb moisture and control local humidity, preventing spoilage or degradation of goods.
What type of oil is Canola oil?
A vegetable oil derived from the canola plant.
Is Canola oil generally considered high or low in saturated fat?
Low in saturated fat and rich in unsaturated fatty acids.
What common natural stimulant is found in drinks like Coke, Pepsi, tea, and coffee?
Caffeine.
How does caffeine work to keep you alert?
By stimulating the brain and central nervous system.
What type of electromagnetic waves do TV remote controls typically use to transmit signals?
Infrared (IR) light waves.
Why are infrared waves used in TV remotes instead of visible light or radio waves?
They are invisible to the human eye and do not interfere with other wireless devices like radios or Wi-Fi.
What is ‘Royal Haemophilia’ and why is it called ‘royal’?
A sex-linked genetic disorder causing delayed blood clotting. It’s called ‘royal’ because Queen Victoria was a carrier, passing it to descendants.
What is capillary action (capillarity)?
The spontaneous rise of a liquid in a narrow space (like a thin tube or porous material), sometimes against gravity.
Give an example of capillary action mentioned in the text.
Blotting of ink, spread of water on cotton cloth, rising of water from plant roots to foliage.
Under what condition does the groundwater level (water table) of an area typically rise?
If more water percolates through the land (e.g., due to rainfall) than is extracted.
What causes the disease Lathyrism?
Excessive consumption of Khesari dal (Lathyrus sativus).
What is the main symptom of Lathyrism?
Paralysis of both the lower limbs.
Why are Barium compounds (like Barium sulfate solution) given to patients before a stomach X-ray?
To coat the stomach and upper digestive tract, making abnormalities more visible on the X-ray images.
What medical procedure uses a long, thin tube with a camera (endoscope) to look inside the body?
Endoscopy.
What principle of light allows an endoscope to view the interior of body cavities?
Total Internal Reflection.
Name one use of Neem (Azadirachta indica) as a biofertilizer mentioned in the text.
Neem coated urea.
Name one use of Neem as a biopesticide mentioned in the text.
Neem guard or Neem seed kernel extract.
What is Atropine sulfate eye drops used for?
To dilate the pupil before eye exams or treat conditions like amblyopia (lazy eye).
Why is Ether less commonly used as an anesthetic in developed nations despite its low cost?
Because of its explosive flammability.
