Velocity and Acceleration MCQs

Q1. Which of the following is a scalar quantity?

• A.Speed
• B.Velocity
• C.Displacement
• D.Acceleration

Answer: A. Speed

What is the textbook's take? Speed has only magnitude -> scalar. Does that line up with one of the options? Yes - Correct. And the rest? option B) 'Velocity' is incorrect: A vector; option C) 'Displacement' misses the point - A vector. Pick: A) Speed.

Q2. An object moves with constant speed along a curved path. Which quantity is definitely changing?

• A.its velocity, because direction is changing
• B.its speed
• C.nothing at all
• D.its mass

Answer: A. its velocity, because direction is changing

The idea this question leans on: Velocity is a vector; changing direction at constant speed still changes the velocity. That fits the listed correct option directly - Correct. Quickly on the wrong ones: option B) 'its speed' misses the point - Speed is stated to be constant; option C) 'nothing at all' doesn't hold - Direction changes on a curve, so velocity changes. Hence the answer is A) its velocity, because direction is changing.

Q3. Which situation describes a body with uniform velocity?

• A.moving in a straight line covering equal displacements in equal time intervals
• B.moving in a circle at constant speed
• C.speeding up along a straight road
• D.at rest at a fixed point

Answer: A. moving in a straight line covering equal displacements in equal time intervals