461. For the following question, select the correct option: Which wave requires a material medium to travel?
✅ D. Sound wave
Sound is a mechanical wave and requires a medium. Read more
Physics – Page 24
462. For the following question, select the correct option: 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
463. For the following question, select the correct option: Which quantity is measured in joules?
✅ C. Energy
The joule is the SI unit of energy and work. Read more
464. For the following question, select the correct option: 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
465. For the following question, select the correct option: What is momentum equal to?
✅ C. Mass × velocity
Linear momentum is p = mv. Read more
466. For the following question, select the correct option: Which phenomenon is the bouncing back of light from a surface?
✅ C. Reflection
Reflection is the return of light from a surface. Read more
467. For the following question, select the correct option: 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
468. For the following question, select the correct option: What is frequency measured in?
✅ C. Hertz
Frequency is measured in hertz. Read more
469. For the following question, select the correct option: What is the unit of magnetic flux density?
✅ B. Tesla
Magnetic flux density is measured in teslas. Read more
470. For the following question, select the correct option: Which form of energy is stored in a stretched spring?
✅ B. Elastic potential energy
A stretched spring stores elastic potential energy. Read more
471. For the following question, select the correct option: What is the formula for kinetic energy?
✅ C. ½mv²
Kinetic energy is one-half mass times velocity squared. Read more
472. For the following question, select the correct option: What type of lens is thicker in the middle than at the edges?
✅ C. Convex lens
A convex lens is thicker at the center and converges parallel light rays. Read more
473. For the following question, select the correct option: What is the unit of electrical resistance?
✅ D. Ohm
Electrical resistance is measured in ohms. Read more
474. For the following question, select the correct option: 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
475. For the following question, select the correct option: 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
476. For the following question, select the correct option: What instrument measures potential difference?
✅ B. Voltmeter
A voltmeter measures potential difference. Read more
477. For the following question, select the correct option: What is the speed of light in vacuum approximately?
✅ A. 3 × 10^8 m/s
Light travels in vacuum at approximately 3 × 10^8 meters per second. Read more
478. For the following question, select the correct option: What instrument measures electric current?
✅ C. Ammeter
An ammeter measures electric current. Read more
479. For the following question, select the correct option: What is the SI unit of pressure?
✅ B. Pascal
Pressure is measured in pascals. Read more
480. For the following question, select the correct option: What is the SI unit of power?
✅ D. Watt
Power is measured in watts. Read more