441. Which of the following is correct? Which wave requires a material medium to travel?
✅ D. Sound wave
Sound is a mechanical wave and requires a medium. Read more
Physics – Page 23
442. Which of the following is correct? What happens to the resistance of a metallic conductor generally when temperature increases?
✅ C. It increases
For typical metals, electrical resistance increases as temperature rises. Read more
443. Which of the following is correct? 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
444. Which of the following is correct? What is momentum equal to?
✅ D. Mass × velocity
Linear momentum is p = mv. Read more
445. Which of the following is correct? Which quantity is measured in joules?
✅ C. Energy
The joule is the SI unit of energy and work. Read more
446. Which of the following is correct? Which phenomenon is the bouncing back of light from a surface?
✅ D. Reflection
Reflection is the return of light from a surface. Read more
447. Which of the following is correct? Which phenomenon explains the bending of light when it passes between media?
✅ B. Refraction
Refraction is the change in direction of light due to a change in speed between media. Read more
448. Which of the following is correct? What is the unit of magnetic flux density?
✅ C. Tesla
Magnetic flux density is measured in teslas. Read more
449. Which of the following is correct? What is frequency measured in?
✅ B. Hertz
Frequency is measured in hertz. Read more
450. Which of the following is correct? Which form of energy is stored in a stretched spring?
✅ B. Elastic potential energy
A stretched spring stores elastic potential energy. Read more
451. Which of the following is correct? 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
452. Which of the following is correct? What is the formula for kinetic energy?
✅ B. ½mv²
Kinetic energy is one-half mass times velocity squared. Read more
453. Which of the following is correct? 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
454. Which of the following is correct? What is the unit of electrical resistance?
✅ C. Ohm
Electrical resistance is measured in ohms. Read more
455. Which of the following is correct? 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
456. Which of the following is correct? What instrument measures potential difference?
✅ C. Voltmeter
A voltmeter measures potential difference. Read more
457. Which of the following is correct? 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
458. Which of the following is correct? What instrument measures electric current?
✅ D. Ammeter
An ammeter measures electric current. Read more
459. Which of the following is correct? What is the SI unit of pressure?
✅ D. Pascal
Pressure is measured in pascals. Read more
460. Which of the following is correct? What is the SI unit of power?
✅ C. Watt
Power is measured in watts. Read more