Almost 500 antibiotics, inc lu din g strepto my cin, aureomycin and terramycin have been isolated from:
Non-stick frying pans are coated black with teflon, a material that is resistant to heat. Teflon is a polymer of:
D is the correct option.Polymerization of tetrafluoroethylene produces polytetrafluoroethylene (PTFE) polymers such as Teflon and Fluon. PTFE is one of the two fluorocarbon resins composed wholly of fluorine and carbon.
Food articles like milk, vegetables and bread are kept in a refrigerator. Medicines are labelled ‘Store in a cool, dry place’. By keeping at low temperatures, they are prevented from decay or destruction, because:
Bell- metal is t he metal u sed for m aking bell s for churches. This metal gives the bell its special, ringing sound. It contains:
Ice floats on water because it has an open structure compared to water and therefore occupies a greater volume of space for the same weight. This open structure of ice is due to:
The correct option is B.
This unusual behavior has its origin in the structure of the water molecule. There is a strong tendency to form a network of hydrogen bonds, where each hydrogen atom is in a line between two oxygen atoms. ... It is this open solid structure that causes ice to be less dense than liquid water.
Very fast conduction of electricity by matter is called supercon-ductivity. This happens when matter is:
The correct option is B.
The resistance of a conductor is directly proportional to the temperature. So, when it is cooled below a certain temperature called critical temperature, the resistance tends to drop to zero and superconductivity can be observed.
Many fruits have pleasant odour. Some of the pleasant odour of common fruits are due to:
Esters occur widely in nature and generally have pleasant odors and are often responsible for the characteristic fragrances of fruits and flowers.
Glycol is used in car radiators as
What are asteroids?
Which of the following statements in correct?
i.The Earth spins around at over 1,500 km/hr - that's over 4 times faster than a Formula 1 car at top speed! The Earth rotates from west to east, which makes the Sun appear to rise in the east and set in the west, but it is due to the Earth spinning rather than the Sun moving.
ii.Earth’s axis is also inclined at approximately 23.439° towards the ecliptic. This means that when the Sun crosses the equator at both equinoxes, it’s daily shift relative to the background stars is at an angle to the equator. In June and December, when the Sun is farthest from the celestial equator, a given shift along the ecliptic corresponds to a large shift at the equator.
So apparent solar days are shorter in March and September than in June or December. In northern temperate latitudes, the Sun rises north of true east during the summer solstice, and sets north of true west, reversing in the winter. The Sun rises south of true east in the summer for the southern temperate zone, and sets south of true west.
iii.Located at approximately 23.5 degrees north latitude (i.e., 23.5 degrees north of the equator), the Tropic of Cancer is the line of latitude that's the northern boundary of the area referred to as the tropics.
iv.The Tropic of Capricorn is a parallel of latitude on the Earth, 23.5 degrees south of the equator. On the northern winter solstice/southern summer solstice (around the 22nd December each year), the Sun reaches its most southerly declination of -23.5 degrees.
How many meteors fall through the earth’s atmosphere every day?
Which of the following statements is correct?
The largest organ of the human body is
The wavelength of gamma rays is
Under sui table c onditi on s, four hydrogen nuc lei combine to form the nucleus of helium atom. This phenomenon is known as
Which of the following statements is correct?
If the direction of current through a resistance i s reversed, then the heating effect will
The correct answer is C as f the direction of current through a resistance i s reversed, then the heating effect will remain unchanged so ,no effect.
Which of the following statements is true?
In electrolysis of water, if 1 gm of hydrogen is liberated during a given time, then the amount of oxygen liberated during the same will be:
Which of the following statements is true?
If we look at a red flower through a green glass during the day, the flower will look
Which of the following statements is true?
23. At the temperature of boiling point of a liquid, its vapour pressure is
The density of mercury is
Which of the following contains photosynthetic pigment?
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