Q: What can be hard or even impossible to perform in a scientific sense? Read this paragraph and choose the correct option from the provided answers: Experiments are sometimes hard or even impossible to do. For example, a scientist who is studying an extinct animal cannot experiment with the animal because it no longer exists. The scientist must rely instead on evidence in the natural world, such as fossils that the extinct animal left behind. Choices: - hypothesises - idea - theorys - experiments A:
experiments

(Question)
Q: What form does formaldehyde take at room temperature? Read this paragraph and choose the correct option from the provided answers: Formaldehyde is a gas at room temperature. Acetaldehyde boils at 20C; in an open vessel, it boils away in a warm room. Most other common aldehydes are liquids at room temperature. Choices: - solid - liquids - plasma - gas A:
(Answer)
gas

Ques: Q: Abundant in unpolluted ponds and streams, planarians prey on smaller animals or feed on? Read this paragraph and choose the correct option from the provided answers: Choices: - algae - fungi - unidentified animals - dead animals A:
Ans: dead animals

(Q).
Q: What is the mildest type of brain injury? Read this paragraph and choose the correct option from the provided answers: The mildest and most common type of brain injury is a concussion . This is a bruise on the surface of the brain. It may cause temporary problems such as headache, drowsiness, and confusion. Most concussions in young people occur when they are playing sports, especially contact sports like football. Other sports, like soccer, boxing, baseball, lacrosse, skateboarding, and hockey can also result in concussions. A concussion normally heals on its own in a few days. Choices: - blunt trauma - hydrocephalus - dementia - concussion A:
(A).
concussion

Ques:Q: What term means the amount of a substance required to form a saturated solution in a given amount of solvent at a specified temperature? Read this paragraph and choose the correct option from the provided answers: The solubility of a substance is the amount of that substance that is required to form a saturated solution in a given amount of solvent at a specified temperature. Solubility is often measured as the grams of solute per 100 g of solvent. The solubility of sodium chloride in water is 36.0 g per 100 g water at 20C. The temperature must be specified because solubility varies with temperature. For gases, the pressure must also be specified. Solubility is specific for a particular solvent. We will consider solubility of material in water as solvent. Choices: - viscosity - concentration - turbidity - solubility A:

Ans:solubility

Ques: Q: Motors are the most common application of magnetic force on current-carrying wires. motors have loops of wire in this? Read this paragraph and choose the correct option from the provided answers: 22.8 Torque on a Current Loop: Motors and Meters Motors are the most common application of magnetic force on current-carrying wires. Motors have loops of wire in a magnetic field. When current is passed through the loops, the magnetic field exerts torque on the loops, which rotates a shaft. Electrical energy is converted to mechanical work in the process. (See Figure 22.34. Choices: - electrical circuit - capacitors - spark plugs - magnetic field A:
Ans:
magnetic field