541. Which wave requires a material medium to travel?
✅ D. Sound wave
Sound is a mechanical wave and requires a medium. Read more
Physics – Page 28
542. Which simple machine is a rigid bar pivoted about a fixed point?
✅ A. Lever
A lever is a rigid bar that rotates around a fulcrum. Read more
543. What happens to the resistance of a metallic conductor generally when temperature increases?
✅ A. It increases
For typical metals, electrical resistance increases as temperature rises. Read more
544. Which quantity is measured in joules?
✅ B. Energy
The joule is the SI unit of energy and work. Read more
545. What is momentum equal to?
✅ C. Mass × velocity
Linear momentum is p = mv. Read more
546. Which phenomenon is the bouncing back of light from a surface?
✅ B. Reflection
Reflection is the return of light from a surface. Read more
547. Which phenomenon explains the bending of light when it passes between media?
✅ A. Refraction
Refraction is the change in direction of light due to a change in speed between media. Read more
548. What is frequency measured in?
✅ A. Hertz
Frequency is measured in hertz. Read more
549. What is the unit of magnetic flux density?
✅ B. Tesla
Magnetic flux density is measured in teslas. Read more
550. Which form of energy is stored in a stretched spring?
✅ C. Elastic potential energy
A stretched spring stores elastic potential energy. Read more
551. What is the formula for kinetic energy?
✅ D. ½mv²
Kinetic energy is one-half mass times velocity squared. Read more
552. What type of lens is thicker in the middle than at the edges?
✅ A. Convex lens
A convex lens is thicker at the center and converges parallel light rays. Read more
553. What is the unit of electrical resistance?
✅ D. Ohm
Electrical resistance is measured in ohms. Read more
554. Which law states that every action has an equal and opposite reaction?
✅ B. Newton's third law
Newton's third law describes action and reaction forces. Read more
555. What instrument measures potential difference?
✅ C. Voltmeter
A voltmeter measures potential difference. Read more
556. What is the acceleration due to gravity near Earth’s surface approximately?
✅ B. 9.8 m/s²
Near Earth's surface, gravitational acceleration is approximately 9.8 m/s². Read more
557. What instrument measures electric current?
✅ C. Ammeter
An ammeter measures electric current. Read more
558. What is the speed of light in vacuum approximately?
✅ D. 3 × 10^8 m/s
Light travels in vacuum at approximately 3 × 10^8 meters per second. Read more
559. What is the SI unit of power?
✅ A. Watt
Power is measured in watts. Read more
560. What is the SI unit of pressure?
✅ C. Pascal
Pressure is measured in pascals. Read more