641. 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
Physics – Page 33
642. 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
643. Which option correctly answers this question: what is frequency measured in?
✅ B. Hertz
Frequency is measured in hertz. Read more
644. 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
645. 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
646. 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
647. Which option correctly answers this question: what is the unit of electrical resistance?
✅ B. Ohm
Electrical resistance is measured in ohms. Read more
648. 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
649. 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
650. Which option correctly answers this question: what instrument measures potential difference?
✅ C. Voltmeter
A voltmeter measures potential difference. Read more
651. 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
652. Which option correctly answers this question: what instrument measures electric current?
✅ A. Ammeter
An ammeter measures electric current. Read more
653. 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
654. Which option correctly answers this question: what is the SI unit of power?
✅ C. Watt
Power is measured in watts. Read more
655. Which option correctly answers this question: what is the SI unit of pressure?
✅ A. Pascal
Pressure is measured in pascals. Read more
656. Which wave requires a material medium to travel — select the correct answer.
✅ A. Sound wave
Sound is a mechanical wave and requires a medium. Read more
657. Which simple machine is a rigid bar pivoted about a fixed point — select the correct answer.
✅ B. Lever
A lever is a rigid bar that rotates around a fulcrum. Read more
658. What happens to the resistance of a metallic conductor generally when temperature increases — select the correct answer.
✅ D. It increases
For typical metals, electrical resistance increases as temperature rises. Read more
659. Which quantity is measured in joules — select the correct answer.
✅ C. Energy
The joule is the SI unit of energy and work. Read more
660. What is momentum equal to — select the correct answer.
✅ B. Mass × velocity
Linear momentum is p = mv. Read more