Important Numerical of FSC part 2 or class 12 or inter Class

Numericals

Section A

1. Find the efficiency of a carnot engine working between 100°C and 50°C.

2. Find the root mean square of a hydrogen molecle at 7°C. Take the mass of a hydrogen molecule to be 3.32 x 10-27 kgm and Boltzmann’s constant = 1.38 x 10-23 joules/°K.

3. 540 calories of heat is required to vapoirze 1 gm of water at 100°C. Define the entropy change involved in vaporizing 5gm of water. (1 calorie = 4.2 joules)

4. A glass flask is filled to the mark with 60cm3 of mercury at 20°C. If the flask and its contents are heated to 40°C, how much mercury will be above the mark? a for glass = 9 x 10-6 /°C and b for mercury = 182 x 10-6 /°C.

5. A carnot engine whose low temperature reservoir is 200°K has an efficiency of 50%. It is desired to increase this to 75%. By how many degrees must the temperature be decreased, if higher temperature of the reservoir remains constant?

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Top 10 Foods to Help Prevent Clogged Arteries

10 Foods to Help Prevent Clogged Arteries

• Garlic
Since ancient times garlic has been used to treat heart
disease and hypertension. According to a study published
in preventive medicine, garlic inhibits coronary artery
calcification which serves as a marker for plaque
formation.
• Grapes
Grapes are rich in flavonoids, quercetin, and resveratrol.
These flavonoids have been found to prevent the oxidation
of bad cholesterol that leads to the formation of plaque in
artery walls. They also lower the risk of developing blood
clots that can lead to heart attacks.
• Spinach
Spinach is rich in potassium and folic acids, both of which
act as a defense against high blood pressure. Spinach is
also rich in lutein, a plant carotenoid which not only
protects against age related macular degeneration but also
prevents heart attacks by keeping arteries free from
cholesterol build up.
• Fish
A study conducted by researchers at Southampton
University found that Omega 3 oils, present in fishes like
tuna and salmon, stop the build up of fatty deposits in the
arteries. These fatty acids prevent clots from forming and
cholesterol from becoming oxidized.
• Olive oil
Only oxidized cholesterol is able to stick to your artery
walls and form plaques. Monounsaturated fats present in
olive oil when mixed with molecules of bad cholesterol
become less likely to be oxidized.
• Tomatoes
According to a study conducted by Korean researchers,
lycopene, a compound present in tomatoes that gives them
their color, helps in prevent hardening of the arteries.
Researchers found that women with the highest lycopene
levels in their blood had the least stiffness in their arteries.
• Pomegranates
Pomegranate juice not only appears to prevent hardening
of the arteries by reducing blood vessel damage, but may
also reverse the progression of this disease. Pomegranate
fruit and its juice are high in antioxidant content, which
may help fight hardening of the arteries.
• Kiwi and Cantaloupe
These antioxidant-rich foods work by reducing toxic LDL
cholesterol, which is formed by a rusting process in your
arteries. They can help stop the rust in its tracks and even
prevent it from spreading. Eat one cup of cantaloupe or
one kiwi per day to unclog your arteries.
• Cranberry juice
This juice strains the fat out of arteries. Instead of having
fat build up in your blood vessels, this juice boosts your
cell’s ability to absorb the fat and use it for production of
energy. Drink three glasses of this juice every week to
unclog your arteries.
• Oats
Thanks to the soluble fiber in oats, cholesterol doesn’t
stand a chance. This fiber attaches itself to cholesterol
and carries it right out of your system. Some studies have
shown that eating just 1 1/2 to 2 1/2 cups of cooked oat-
bran cereal daily can lower cholesterol levels by almost
20%.

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