This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
Here are the solutions to the multiple-choice questions: 1. SI unit of radioactivity is: The SI unit of radioactivity is the Becquerel (Bq). a) Bq 2. Formula of focal length is: For spherical mirrors, the focal length (f) is half of the radius of curvature (R). c) f=R/2 3. Refractive index of glass is: The refractive index of common glass is approximately 1.52. b) 1.52 4. All waves transfer: Waves are disturbances that transfer energy from one point to another without transferring matter. d) Energy 5. Sound travels to ear: Sound is a mechanical wave that travels through a medium by creating variations in pressure of air (compressions and rarefactions) which cause vibrations. a) Pressure of air 6. An object is placed at center of curvature for concave mirror, what is position of its image? For a concave mirror, if an object is placed at the center of curvature (C), the image is also formed at center of curvature. b) At center of curvature 7. Electric field lines: Electric field lines never cross each other because if they did, the electric field at the point of intersection would have two different directions, which is impossible. d) Never cross each other 8. What is power rating of lamp connected 12V source when current is 2.5A? Step 1: Use the formula for power, P = V × I. P = 12 V × 2.5 A Step 2: Calculate the power. P = 30 W c) 30W 9. If a current in wire is increased which is placed perpendicular to a magnetic field, then magnetic force: The magnetic force (F) on a current-carrying wire in a magnetic field is given by F = BIL. If the current (I) increases, the force (F) will increase. a) Increased 10. If X = A · B then X=1 if: For a Boolean AND operation (X = A · B), the output X is 1 only if both inputs A and B are 1. b) B=1, A=1 11. Basic operation of computer is: Computers perform both arithmetic operations (like addition and subtraction) and logic operations (like AND, OR, NOT). d) Both A and C 12. When Uranium (92 protons) emits beta particle then how many protons: During beta decay (^- emission), a neutron in the nucleus transforms into a proton and an electron. The electron is emitted, and the proton remains in the nucleus. This increases the atomic number (number of protons) by 1. Initial protons = 92. After beta emission, protons = 92 + 1 = 93. d) 93