Stemscopes Exam Physical Science 3

Question 1

What is the formula for calculating speed?

Accepted Answer

Speed = Distance ÷ Time

Answer

Speed equals the distance traveled divided by the time taken to travel that distance.

Question 2

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Velocity is a vector quantity because it has both magnitude (speed) and direction.

Question 3

What happens to light when it passes from air into glass?

Accepted Answer

It slows down and bends toward the normal

Answer

Light slows down when entering a denser medium like glass and bends toward the normal line, a process called refraction.

Question 4

Which machine increases force by using a longer effort arm than load arm?

Accepted Answer

Lever

Answer

A lever with a longer effort arm than load arm provides a mechanical advantage by multiplying the input force.

Question 5

What is the unit of electrical resistance?

Accepted Answer

Ohm

Answer

Electrical resistance is measured in Ohms (Ω), named after physicist Georg Simon Ohm.

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