21. A projectile follows which type of path?
a) Circular
b) Parabolic
c) Rectilinear
d) Elliptical
22. The horizontal component of velocity in projectile motion:
a) Remains constant
b) Increases
c) Decreases
d) Is always zero
23. The vertical component of velocity in projectile motion:
a) Remains constant
b) Increases due to gravity
c) Decreases due to gravity
d) Becomes zero
24. When an object is dropped freely, the only force acting on it is:
a) Air resistance
b) Friction
c) Gravity
d) Magnetic force
25. The unit of velocity is:
a) m/s
b) m²/s
c) kg m/s
d) m/s²
26. A body moving in a straight line with constant speed has:
a) Zero acceleration
b) Increasing acceleration
c) Decreasing acceleration
d) Constant acceleration
27. In uniform circular motion, the speed of the object is:
a) Constant
b) Increasing
c) Decreasing
d) Zero
28. An object in free fall has a velocity that:
a) Increases uniformly
b) Decreases uniformly
c) Remains constant
d) First increases, then decreases
29. The SI unit of speed is:
a) m²/s
b) m/s
c) km/s
d) m/s²
30. Acceleration is the rate of change of:
a) Speed
b) Velocity
c) Displacement
d) Distance