What is the SI unit of power — select the correct answer.

✅ A. Reflection

Reflection is the return of light from a surface. Read more

✅ B. Elastic potential energy

A stretched spring stores elastic potential energy. Read more

✅ A. Refraction

Refraction is the change in direction of light due to a change in speed between media. Read more

✅ A. ½mv²

Kinetic energy is one-half mass times velocity squared. Read more

✅ D. Mass × velocity

Linear momentum is p = mv. Read more

✅ B. Pascal

Pressure is measured in pascals. Read more

✅ C. It increases

For typical metals, electrical resistance increases as temperature rises. Read more

✅ D. Pascal

Pressure is measured in pascals. Read more