Here are the physics questions from the image: 1. What do you mean by degradation of energy? Differentiate between Renewable and Non renewable sources of energy. 2. The diagram sh... Here are the physics questions from the image: 1. What do you mean by degradation of energy? Differentiate between Renewable and Non renewable sources of energy. 2. The diagram shows a point object P in front of a plane mirror MM'. a) Complete the diagram by taking two rays from the point P to show the formation of its image. b) Is the image formed real or virtual? Why? 3. a) What is a barometer? b) How is the barometric height of a simple barometer affected if: 1. It's taken into a mine. 2. It's tube is slightly tilted from vertical. 3. A drop of liquid is inserted inside the tube. 4. A) Differentiate between Thrust & Pressure. B) How does the pressure exerted by a solid and a fluid differ? 5. A) Define One Joule of energy. B) State the energy changes in the following: 1. An electric oven. 6. Draw a ray diagram to show the focal point of an object placed between centre of curvature of a concave mirror. Read more

Here are the answers to the physics questions as requested.

Here are the answers to the physics questions.

• Degradation of energy refers to the conversion of energy into unusable forms like heat or sound.
• Renewable energy sources can be replenished naturally, while non-renewable sources are finite.

• a) To complete the ray diagram, draw two rays from point P to the mirror. Reflect each ray such that the angle of incidence equals the angle of reflection. Extend the reflected rays behind the mirror to find the image point P'.
• b) The image formed is virtual because the light rays do not actually converge at the image point; instead, they only appear to come from that point.

• a) A barometer is an instrument used to measure atmospheric pressure.
• b)
  1. When taken into a mine, the barometric height increases because atmospheric pressure increases with depth.
  2. Tilting the tube does not affect the barometric height, but the length of the mercury column along the tube will increase.
  3. If a drop of liquid is inserted, it will depress the mercury column, decreasing the barometric height due to the vapor pressure of the liquid.

• A) Thrust is the total force acting perpendicularly on a surface, while pressure is the thrust per unit area.
• B) Solids exert pressure only in a downward direction due to their weight, while fluids exert pressure equally in all directions.

• A) One Joule is the amount of work done when a force of one Newton displaces a body by one meter in the direction of the force.
• B) 1. In an electric oven, electrical energy is converted into heat energy.

• To show the focal point: draw a ray diagram for a concave mirror with the object placed between the center of curvature (C) and the focal point (F). Draw one ray parallel to the principal axis, which reflects through F. Draw another ray through C, which reflects back along itself. The point where these reflected rays intersect is the location of the image.