Test: Motion and Measurement of Distances - Class 6 MCQ

 The motion of a bullet fired from a gun is a rectilinear motion. 
The motion of a body in a straight line is known as rectilinear motion
Motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity, acceleration, time and speed.

The least count of a measuring instrument is the smallest change in the quantity being measured that can be detected. In this case, the scale has 20 divisions in 1 centimeter. To find the least count, we divide the smallest division (1 cm) by the number of divisions.

So, the least count is 0.05 cm or 0.5 mm. Therefore, the correct answer is (d) 0.5 mm.

Hectare is a unit of area commonly used for measuring large land areas, especially in agriculture.
Therefore, the correct answer is (c) Area.

If we observe the motion of the bob in the above figure, we see it moves to and fro about a point ‘O’. This type of motion is known as oscillatory motion. Also the motion of simple pendulum is a periodic motion as it takes equal time to complete one oscillation.

The distance between two edges of a writing board is typically measured in centimeters for smaller lengths.
Therefore, the correct answer is (b) Centimeter.

When an object moves along a circular path, it is called circular motion. During such a motion, the direction of motion at any point is given by the tangent at that point which changes continuously.

The property of a body by virtue of which it resists any change in its state of rest or of motion in a straight line on its own is called its inertia.

As 20 divisions = 1 cm 
∴ 1 division = 1/20 cm 
= 0.05cm 
= 0.5 mm
Hence, least count of this scale = 0.5 mm

Motion of soldiers on march past is rectilinear motion; Every oscillatory motion is also a periodic motion; Hockey player running after a ball is random motion.

Rectilinear motion is another name for straight-line motion.