Which type of joint permits rotation in multiple axes?

1. Revolute joint
2. Spherical joint
3. Prismatic joint
4. None of these

Which type of joint permits single axis rotation?

1. Prismatic joint
2. Spherical joint
3. Revolute joint
4. None of these

What kind of robot movement revolves around a fixed point?

1. Linear motion
2. Circular motion
3. Angular motion
4. None of these

What kind of robot movement involves the straight line back and forth movement?

1. Linear motion
2. Angular motion
3. Circular motion
4. None of these