# Free Motion and Measurements of Distances 01 Practice Test - 6th grade

Arrange the following modes of transportation from the earliest to the newest ones.

A.

B.

C.

D.

#### SOLUTION

Solution : C

Roadways were the earliest mode of transportation followed by waterways and airways. The steam engine and the railroad were invented in the 19th century. Later, motorised boats and ships were developed as a means of water transport. The Wright brothers invented the aeroplane and gave the world another means of transport in the early 20th century.

Which of following is the fastest means of transportation?

A.

B.

Airways

C.

Waterways

D.

Railways

#### SOLUTION

Solution : B

Airways takes minimum time to travel from one place to another. Aeroplanes can travel at very high speeds and consume less time for transportation.

Which of the following is the most suitable instrument for measuring length of a curved line?

A.

Thermometer

B.

Measuring cylinder

C.

A human foot

D.

#### SOLUTION

Solution : D

Foot is not a standard instrument of measurement. The length of the foot may vary from person to person. So it can't be used to measure the length of a curved line.
A thread is flexible. It can be bent easily to cover the curved line. It can then be straightened on a scale to measure the length.
Measuring cylinder is used to measure volume of liquids.
Thermometer is used to measure and indicate temperature of any object.

According to conversion of units of measurement:
5924 m=–––

A. 5.924 km
B. 59.24 km
C. 0.5924 km
D. 592.4 km

#### SOLUTION

Solution : A

We know 1000 m = 1 km
5924 m=59241000 km
5924 m=5.924 km

A motion that repeats itself after equal intervals of time is known as:

A.

Circular motion.

B.

Rectilinear motion.

C.

Periodic motion.

D.

Rotational motion.

#### SOLUTION

Solution : C

A motion that repeats itself after equal interval of time is called as periodic motion. For example, the motion of a pendulum and the motion of the Earth around the Sun can be considered as a periodic motion since it repeats itself after an equal interval of time.

While travelling in a train, the co-passengers appear to be in motion.

A. True
B. False

#### SOLUTION

Solution : B

When we see the trees from a moving train, their position is changing with respect to us. Hence, they appear to be moving. On the other hand, the position of co-passengers is not changing with respect to us, hence they appear to be stationary.

Which of the following is not a fundamental unit?

A.

Metre

B.

Kilogram

C.

Kelvin

D.

Cubic metre

#### SOLUTION

Solution : D

Metre, kilogram and kelvin are fundamental units. Metre is the fundamental unit of length, kilogram is the fundamental unit of mass and kelvin is the fundamental unit of temperature.
Cubic metre is a unit of volume and is obtained from the unit of length (m).

Two students measure a particular length using the same instrument one after the other. They will always estimate an equal value even if they vary the position of their eyes.

A.

True

B.

False

#### SOLUTION

Solution : B

They may encounter some human error, for example, parallax error. Parallax error arises when the reading is taken from random angles. It is a non-technical (human) error in which there is a difference in the readings if the readings are taken at different angles from the line of sight. Hence, to avoid this error, we must always take the readings by placing our eyes perpendicularly above the markings.

The tip of the second's hand is in a circular motion with respect to the centre of the clock.

A.

True

B.

False

#### SOLUTION

Solution : A

When a particle moves along the circumference of a circle it is said to be in a circular motion. The tip of the second's hand is doing circular motion as it is moving around a circular path with respect to the centre of the clock.

The length of your footstep can be used as a standard unit of length.

A.

True

B.

False

#### SOLUTION

Solution : B

The unit of length should be chosen such that it is constant and same for everyone. SInce, everyone's footstep is not same, it cannot be used as a unit of length.