Important Questions Test: Motion & Measurement of Distances - UPSC MCQ

We Know 1cm = 10mm
or 10 mm = 1cm
Ten millimetre is equal to 1 centimetre.

A moving swing has periodic motion as it repeat the same at certain interval of time.
Periodic motion repeated in equal intervals of time.

 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 as 1 cm =10mm so 0.05cm = 0.5mm . Therefore, the correct answer is (d) 0.5 mm.

Since 1 meter is equal to 100 centimeters, we can convert 100 millimeters to centimeters.

Therefore, the correct answer is (d) 10 cm.

One meter is equal to 100 cm and one cm is equal to 10 mm. therefore, a meter is equal to 100 × 10 = 1000 mm.

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

Volume is typically measured in units like liters or milliliters. Liters are more appropriate for larger quantities like the volume of milk in a bucket.

Therefore, the correct answer is (c) Liters.

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.

A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.

The distance between two ends of writing bottle is measured in centimetre.

Option (c)

1 centimeter is equal to 10 millimeters.
Therefore, the correct answer is (c) 10 mm.

Hectare is a unit of area and is commonly used to measure large land areas, particularly in agriculture.
Therefore, the correct answer is (c) Area of crop land.

Measurement is the process of comparing an unknown quantity with a known or standard quantity.
Therefore, the correct answer is (a) Measurement.

Diameter of a circle is twice the radius of the circle. D = 2 × r.

The time of sunrise is a specific point in time and does not represent a time interval.
Therefore, the correct answer is (a) Time of sunrise.

Movement of blades of a fan is circular motion as it rotates in fixed path.

Motion of simple pendulum is known as periodic motion.

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