501. Which option correctly answers this question: which wave requires a material medium to travel?
✅ D. Sound wave
Sound is a mechanical wave and requires a medium. Read more
Physics – Page 26
502. Which option correctly answers this question: what happens to the resistance of a metallic conductor generally when temperature increases?
✅ B. It increases
For typical metals, electrical resistance increases as temperature rises. Read more
503. Which option correctly answers this question: which simple machine is a rigid bar pivoted about a fixed point?
✅ D. Lever
A lever is a rigid bar that rotates around a fulcrum. Read more
504. Which option correctly answers this question: what is momentum equal to?
✅ B. Mass × velocity
Linear momentum is p = mv. Read more
505. Which option correctly answers this question: which quantity is measured in joules?
✅ A. Energy
The joule is the SI unit of energy and work. Read more
506. Which option correctly answers this question: which phenomenon is the bouncing back of light from a surface?
✅ D. Reflection
Reflection is the return of light from a surface. Read more
507. Which option correctly answers this question: 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
508. Which option correctly answers this question: what is frequency measured in?
✅ B. Hertz
Frequency is measured in hertz. Read more
509. Which option correctly answers this question: what is the unit of magnetic flux density?
✅ C. Tesla
Magnetic flux density is measured in teslas. Read more
510. Which option correctly answers this question: which form of energy is stored in a stretched spring?
✅ C. Elastic potential energy
A stretched spring stores elastic potential energy. Read more
511. Which option correctly answers this question: 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
512. Which option correctly answers this question: what is the unit of electrical resistance?
✅ B. Ohm
Electrical resistance is measured in ohms. Read more
513. Which option correctly answers this question: what is the formula for kinetic energy?
✅ C. ½mv²
Kinetic energy is one-half mass times velocity squared. Read more
514. Which option correctly answers this question: 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
515. Which option correctly answers this question: what instrument measures potential difference?
✅ C. Voltmeter
A voltmeter measures potential difference. Read more
516. Which option correctly answers this question: what is the acceleration due to gravity near Earth’s surface approximately?
✅ A. 9.8 m/s²
Near Earth's surface, gravitational acceleration is approximately 9.8 m/s². Read more
517. Which option correctly answers this question: what instrument measures electric current?
✅ A. Ammeter
An ammeter measures electric current. Read more
518. Which option correctly answers this question: what is the speed of light in vacuum approximately?
✅ B. 3 × 10^8 m/s
Light travels in vacuum at approximately 3 × 10^8 meters per second. Read more
519. Which option correctly answers this question: what is the SI unit of power?
✅ C. Watt
Power is measured in watts. Read more
520. Which option correctly answers this question: what is the SI unit of pressure?
✅ A. Pascal
Pressure is measured in pascals. Read more