Science and technology

Why is the sky blue? Answer:- The reason the sky appears blue is because of an effect called scattering. Sunlight has to pass through Earth's atmosphere, which is filled with gases and particles that act like the bumpers on a pinball machine, bouncing sunlight all over the place. But if you've ever held a prism in your hands, you know that sunlight actually is made up of a bunch of different colors, all of which have different wavelengths. Blue light has a relatively short wavelength, so it gets through the filter more easily than colors with longer wavelengths, and as a result are scattered more widely as they pass through the atmosphere. That's why the sky looks blue during the parts of the day when the sun appears to be high in the sky (though it's actually the spot on the planet where you are standing that is moving, relative to the sun). At sunrise and sunset, though, the sun's rays have to travel a longer distance to reach your position. That cancel...

1.Type A blood    A. can be used to donate to type AB individuals    B. can be used to donate to type B individuals    C. contains type B antigens on the surface of red blood cells    D. can always be used to donate to an Rh+ individual Answer: Option A 2.Antibodies can be used    A. for the localization of proteins in the cell    B. for protein purification    C. to catalyze chemical reactions    D. all of the above Answer: Option D 3.The main function of antibodies is to    A. kill all the foreign bodies    B. generate antigens, thus conferring immunization    C. protect the circulatory system    D. chemically combine with the antigen which induces it, inactivate the antigen and protect the body from disease Answer:Option D 4.A secondary antibody is an antibody that    A. has been used in prior experiments    B. is synthetically produ...

1.Nuclear fission is caused by the impact of    A. neutron    B. proton    C. deuteron    D. electron Answer: Option A 2,Isotopes are separated by    A. crystallisation    B. sublimation    C. distillation    D. filtration Answer: Option C 3.Which of the following rays are more penetrating?     A. Beta rays     B. Alpha rays     C. Gamma rays     D. X-rays Answer: Option C 4.How many colours the sunlight spectrum has?    A.Three    B. Seven    C. Four    D. Five Answer: Option B 5.Mesons are found in    A. Laser beam    B. X-rays    C. Gamma rays    D. Cosmic rays Answer: Option D

1. Who invented the first controllable flying AEROPLANE (AIRPLANE)? A.Wright Brothers B.Lidenbergh Brothers C.South Brothers D.West Brothers Answer;-A Wilbur and Orville Wright made the first successful controlled powered flight at Kitty Hawk, North Carolina, in December 1903. The twelve second flight covered a distance of 120 feet and an altitude of just ten feet. 2. In which decade was the Internet first implemented? A.1940s B1950s C.1960s D.1980s Answer;-C The first message ever sent over what is now called the Internet took place at 10:30PM on October 29, 1969. Back then, the Department of Defense called it ARPAnet (Advanced Research Projects Agency network). 3.What now-ubiquitous device was invented by Zenith engineer Eugene Polley in 1955? A.Microwave oven B.Remote control C.VCR D.Calculator Answer: Option B The first wireless remote control for television was called Flashmatic. (Remember when you had to get up to change the c...

Diabetes is a number of diseases that involve problems with the hormone insulin. Normally, the pancreas (an organ behind the stomach) releases insulin to help your body store and use the sugar and fat from the food you eat. Diabetes can occur when the pancreas produces very little or no insulin, or when the body does not respond appropriately to insulin. As yet, there is no cure. People with diabetes need to manage their disease to stay healthy. Diabetes is a disorder of metabolism -- the way our bodies use digested food for growth and energy. There are three main types of diabetes: type 1, type 2, and gestational diabetes. What Is Diabetes? Diabetes is a number of diseases that involve problems with the hormone insulin. There is no cure for diabetes. People with diabetes need to manage their disease to stay healthy.

Diseases and infections that can kill you within 24 hours 1. From Ebola to the bubonic plague, there are diseases that can kill within 24 hours if not caught in time or treated properly.  2. Bubonic plague Also known as the Black Death, the plague is caused by the bacterium Yersinia pestis. In the mid-1300s, it wiped out approximately half of Europe's population.  Bubonic plague The disease infects small animals, such as rats, and is then transmitted to humans through fleas or other bugs. Symptoms include fever, chills, vomiting, and body aches.  The disease also causes lymph-node sw...