Olympiad Test: Motion and Measurement of Distances - Class 6 MCQ

When measuring the length using a ruler, it is important to keep your eye vertically above the point where the measurement is being taken. This helps to avoid parallax errors, which occur when the measurement is taken from an angle, causing inaccurate readings.

The other options are incorrect:
Option A: The ruler should be placed directly on or near the object to get an accurate measurement, not away from it.
Option B: Worn-out portions of the ruler should not be used, as they may give inaccurate measurements due to wear and tear. Always use the clear and undamaged portions for accurate measurements.

The movement of a person on the road is an example of linear motion, not rotational motion.

The motion described in the scenario is an example of non-uniform motion.
Non-uniform motion occurs when an object travels unequal distances in equal intervals of time. In this case, the car covers a distance of 40 km in the first hour and 50 km in the second hour. The distances covered in each hour are different, indicating that the car is not moving at a constant speed. If it were moving at a constant speed, it would cover the same distance in each hour.
Uniform motion, on the other hand, would involve the object covering equal distances in equal intervals of time. Periodic motion refers to motions that repeat at regular intervals, like the motion of a pendulum. Rotational motion involves objects spinning or rotating around an axis, which is not described in the given scenario. Therefore, the correct answer is B) Non-uniform motion.

Given that a gram has been divided into 1000 equal parts, each part would be equal to one milligram (option C).
Here's the breakdown of metric units of mass:

• 1 kilogram (kg) = 1000 grams (g)
• 1 gram (g) = 1000 milligrams (mg)

Therefore, dividing a gram into 1000 equal parts results in each part being equal to one milligram.

To find the speed of the person in kilometers per hour (km/h), we can use the formula for speed:

Given:
Distance = 45 meters
Time = 9 seconds
Firstly, we need to convert the distance from meters to kilometers and time from seconds to hours because the answer is required in km/h.
1 kilometer = 1000 meters (conversion factor)

1 hour = 3600 seconds (conversion factor)

Now, let's use the formula for speed:

Therefore, the speed of the person covering the distance from X to Y is 18 km/h (option A).

correct answer is B. As the truck is moving with a uniform speed , so it will cover equal distances in equal time intervals which is represented by a straight line on Distance -Time Graph.

We decide whether an object is in motion or at rest based on:

1. If an object changes its position with time, it is in motion.
2. If an object does not change its position with time, it is at rest.

Hence, option C is correct.

As the Y- coordiante is constant , so there is no change in distance , so body is at rest

Water transportation described as the movement of people and freight by boat, ship, barge or sailboat across ocean, sea, lake, canal, or river, or through other modes of water transportation. 

Hence Boat is a means of Water transport

When a ball falls vertically under the influence of gravity, its motion is in a straight line, which is called linear motion. The ball moves along a straight path from a higher position to a lower one, with its speed increasing due to the force of gravity. The motion is not periodic, circular, or vibratory, so the correct choice is linear.