Answer the following question given this paragraph: In the modern periodic table, each element is represented by its chemical symbol. The number above each symbol is its atomic number. Atomic numbers increase from left to right and from top to bottom in the table. Q: What is denoted by the number above the chemical symbol of each element in a modern periodic table? Choices: - metallic number - atomic weight - electron count - atomic number A:
atomic number
(Question)
Answer the following question given this paragraph: Black holes Black holes are objects having such large gravitational fields that things can fall in, but nothing, not even light, can escape. Bodies, like the Earth or the Sun, have what is called an escape velocity. If an object moves straight up from the body, starting at the escape velocity, it will just be able to escape the gravity of the body. The greater the acceleration of gravity on the body, the greater is the escape velocity. As long ago as the late 1700s, it was proposed that if the escape velocity is greater than the speed of light, then light cannot escape. Simon Laplace (17491827), the French astronomer and mathematician, even incorporated this idea of a dark star into his writings. But the idea was dropped after Young's double slit experiment showed light to be a wave. For some time, light was thought not to have particle characteristics and, thus, could not be acted upon by gravity. The idea of a black hole was very quickly reincarnated in 1916 after Einstein's theory of general relativity was published. It is now thought that black holes can form in the supernova collapse of a massive star, forming an object perhaps 10 km across and having a mass greater than that of our Sun. It is interesting that several prominent physicists who worked on the concept, including Einstein, firmly believed that nature would find a way to prohibit such objects. Black holes are difficult to observe directly, because they are small and no light comes directly from them. In fact, no light comes from inside the event horizon, which is defined to be at a distance from the object at which the escape velocity is exactly the speed of light. The radius of the event horizon is known as the Schwarzschild radius R S and is given by. Q: Not even light can escape from what extremely dense object sometimes found in deep space? Choices: - large holes - light holes - star holes - black holes A:
(Answer)
black holes
Ques: Answer the following question given this paragraph: Electromagnetic waves are waves that carry energy through matter or space as vibrating electric and magnetic fields. Electromagnetic waves have a wide range of wavelengths and frequencies. Sunlight contains the complete range of wavelengths of electromagnetic waves, which is called the electromagnetic spectrum. The Figure below shows all the waves in the spectrum. Q: What type of waves carry energy through matter or space as vibrating electric and magnetic fields? Choices: - light waves - mechanical waves - sound waves - electromagnetic waves A:
Ans: electromagnetic waves
(Q).
Answer the following question given this paragraph: We see many objects out in space that emit light. This matter is contained in stars, and the stars are contained in galaxies. Scientists think that stars and galaxies make up only a small part of the matter in the universe. The rest of the matter is called dark matter . Q: Scientists think that stars and galaxies make up only a small part of the matter in the universe. what is the rest of the matter called? Choices: - typical matter - light matter - cold matter - dark matter A:
(A).
dark matter
Ques:Answer the following question given this paragraph: Q: Just under their skin, marine mammals have a very thick layer of insulating fat called what? Choices: - tissue - lipisomes - cellulose - blubber A:

Ans:blubber
Question: Answer the following question given this paragraph: Q: What is the process of converting atmospheric nitrogen to ammonia called? Choices: - atmospheric fixation - ammonia fixation - oral fixation - nitrogen fixation A:
Answer:
nitrogen fixation