(Q).
Q: What is the theory scientists use to explain the matter in the universe and how it's held together? Read this paragraph and choose the correct option from the provided answers: Based on their knowledge of subatomic particles, scientists have developed a theory called the standard model to explain all the matter in the universe and how it is held together. The model includes only the fundamental particles in the Table above . No other particles are needed to explain all kinds of matter. According to the model, all known matter consists of quarks and leptons that interact by exchanging bosons, which transmit fundamental forces. The standard model is a good theory because all of its predictions have been verified by experimental data. However, the model doesn't explain everything, including the force of gravity and why matter has mass. Scientists continue to search for evidence that will allow them to explain these aspects of force and matter as well. You can learn much more about the standard model at the URL below. Click on "the standard model" and follow the sequence titled "What is fundamental?". Choices: - specific model - original model - organic model - standard model A:
(A).
standard model

(Q).
Q: Is sleep an active or inactive state in the brain? Read this paragraph and choose the correct option from the provided answers: Choices: - intense - different - inactive - active A:
(A).
active

(Q).
Q: How many types of surface waves are there? Read this paragraph and choose the correct option from the provided answers: Surface waves travel along the ground outward from an earthquake's epicenter. Surface waves are the slowest of all seismic waves. They travel at 2.5 km (1.5 miles) per second. There are two types of surface waves. Love waves move side-to-side, much like a snake. Rayleigh waves produce a rolling motion as they move up and backward ( Figure above ). Surface waves cause objects to fall and rise. They also cause objects to sway back and forth. These motions cause damage to rigid structures during an earthquake. Choices: - over a hundred - three - six - two A:
(A).
two