2141. Select the best answer: Which simple machine is a rigid bar pivoted about a fixed point?
✅ B. Lever
A lever is a rigid bar that rotates around a fulcrum. Read more
Author: Madad Ali – Page 108
2142. Select the best answer: What is momentum equal to?
✅ A. Mass × velocity
Linear momentum is p = mv. Read more
2143. Select the best answer: Which phenomenon explains the bending of light when it passes between media?
✅ D. Refraction
Refraction is the change in direction of light due to a change in speed between media. Read more
2144. Select the best answer: What is frequency measured in?
✅ B. Hertz
Frequency is measured in hertz. Read more
2145. Select the best answer: What type of lens is thicker in the middle than at the edges?
✅ B. Convex lens
A convex lens is thicker at the center and converges parallel light rays. Read more
2146. Select the best answer: What is the unit of electrical resistance?
✅ D. Ohm
Electrical resistance is measured in ohms. Read more
2147. Select the best answer: What is the acceleration due to gravity near Earth’s surface approximately?
✅ D. 9.8 m/s²
Near Earth's surface, gravitational acceleration is approximately 9.8 m/s². Read more
2148. Select the best answer: What instrument measures electric current?
✅ A. Ammeter
An ammeter measures electric current. Read more
2149. Select the best answer: What is the SI unit of pressure?
✅ D. Pascal
Pressure is measured in pascals. Read more
2150. A narrow piece of land connecting two large masses of land is known as _________?
✅ B. Isthmus
A. Gulf B. Isthmus C. Peninsula D. Continent Read more