Phy Sci 11 Q3 (3)

Review Questions:

1. Which of the following statements provides a reason for the widespread use of fossil fuels?

   Fossil fuels are readily available and inexpensive.

2. Which of the following problems is associated with the burning of coal?

   All of these

3. Which is produced from organic material like plants and trees and is used for heating, cooking, and fuel?

   Biomass

4. Stars derive their energy from the fusion of elements within their core. This fusion process primarily involves the conversion of lighter elements into heavier ones. Among the given options, the correct elements for stellar fusion are:

   Hydrogen and Helium

5. Determining the stage in which stars typically create heavier elements other than iron throughout their life cycle?

   Supernova

6. Figure out the product that is NOT generated by the proton-proton chain reaction in stars:

   Oxygen-16 (16O)

7. Determine which option concludes the reaction.

   He-4 + 97Tc

8. In what manner is the link between an element's location in the periodic table and the frequency of X-rays it emits related to one another?

   The number of protons of the atom is the same as the frequency of spectral lines in the X-ray.

9. Which of the following can be found in the product labels of drain cleaners?

   Sodium hydroxide

10. Which ingredient may come in the form of salts, organic reagents, or buffers that maintain pH balance?

    None of these

11. Which ingredient masks the putrid smell and is used particularly in the bathroom?

    Fragrance enhancers

12. Which ingredient removes the fragrance of a product applicable for sensitive users?

    Masking agents

13. Which ingredient is needed by cleaning agents that are stored for a long period to keep the active ingredient functional?

    Preservatives

14. Which of the following is not an added ingredient of detergents?

    None of these