Class 6 Science Chapter 10 MCQ

Here, are all the statements are correct. Hence, your answer will be option [D].

The motion which repeats itself after regular intervals of time, is called periodic motion. When an object moves along a circular path, it is called circular motion. The movement of seconds’ hand of a watch is repeated after regular intervals of time, so the motion of seconds’ hand of a watch is an example of periodic motion. Similarly, the movement of the seconds’ hand of a watch or clock on the dial is an example of circular motion. As the watch does not move from one place to another by itself but the hands of watch or clock keep on rotating on its dial.

Here, are all the statements are incorrect. Hence, your answer will be option [D]. In option [A]: If an object moves fairly fast, then its movement or motion can be observed easily. In option [B]: If an object moves very slowly, then it becomes very difficult to observe its movement immediately. In option [C]: When an object is stationary it is said to be at rest.

Motion in a straight line is called rectilinear motion. In other words, when an object moves along a straight-line path it is called rectilinear motion. The motion will not be exhibited by the moon moving around the earth is rectilinear motion. And rest of three motions are exhibit by the moon.

Time of the first bell in the school does not express a time interval because it has only a single value of time, while the other quantities like a day, a second and a school period can be divided into a number of shorter periods of time. Note: A time interval should have at least two values of time.

Motion in a straight line is called rectilinear motion. Some examples of rectilinear motion are motion of a vehicle on a straight road, motion of a train on a straight track, motion of a falling stone, motion of a ball rolling on ground etc. Rectilinear motion takes place in a fixed direction.

Since, ribbon is folded 5 times, Length of ribbon = (27.5 – 2) cm x 5 = (25.5 x 5) cm = 127.5 cm = 1.27 m 1.27 m lies in the range of 1.25 m – 1.35 m.

Here, are all the statements are correct. Hence, your answer will be option [D].

A communication satellite is stationed in an orbit high above the earth which shows three types of motion rotational motion, periodic motion and circular motion but not exhibit rectilinear motion.

Paheli moves in a straight path from A to C and from C to A. So, the motion is rectilinear, further Paheli moves in a periodic motion because she makes 5 rounds in the same way and crosses point B in each round, after a regular a time interval. So, her motion is rectilinear and periodic.

When a ball is moving on the ground, it is rotating as well as moving forward on the ground. So, a ball rolling on the ground has two types of motion, rotational motion as well as a rectilinear motion.

Motion of an object or a part of it around a fixed point is known as circular motion. Note: In circular motion an object moves such that its distance from a fixed point remains the same.

A pencil or a notebook has small length which is much smaller than a meter. It is inconvenient to express such a small length in terms of meter. So, the length of small objects is measured in centimeter. Thus, in order to measure the length of a pencil or notebook, we use centimeter as the unit of length. A centimeter is one-hundredth of a meter.

If we consider a merry-go-round as a whole, then it shows rotational motion because it turns on an axle. But the outer part of merry-go-round (on which children sit) shows circular motion. So, a merry-go-round has two types of motion at the same time, rotational motion and circular motion.

In ancient times, people used boats for transport along water routes such as rivers or any water sources. Initially the boats were simple logs of wood in which a hollow cavity was made for people to sit and carry goods.

Here, are all the statements are correct. Hence, your answer will be option [D].

All the reasons are correct. Hence, your answer will be option [D].

In circular motion and object as a whole travel along a circular path but in rotational motion the object spins on its axis.

The earth moves around the sun, so it has circular motion. The earth repeats its motion around the sun after regular intervals of time, so it has periodic motion and the earth rotates on its axis, so it has also rotational motion. Thus, the earth has three types of motion at the same time: circular motion, periodic motion and rotational motion.

In the beginning of 19th century, the invention of steam engine introduced a new source of power to run transport vehicles. Steam engines were used to pull trains on railroads or railway tracks for carrying people and goods from one place to another. Steam engines were also used to run ships in the beginning. The steam engine is called external combustion engine because the fuel or coal for making steam was burnt outside the engine.

The compass was invented in China during the Han Dynasty between the 2nd century BC and 1st century AD where it was called the “south-governor”. The Chinese first used compasses not for navigation, but for spiritual purposes. They used the magnetic devices to organize buildings and other things according to feng shui, the ancient practice of harmonizing an environment according to the “laws of Heaven.”

The scientist all over the world have adopted “International System” of units or SI units which have a uniformity in the measurement of various physical quantities like length, mass and time etc. The SI unit of measuring length is “meter”. The symbol of meter is “m”. The SI unit of measuring mass is “kilogram” (kg) and the SI unit of measuring time is “second” (s)

The screw undergoes two kinds of motion that is periodic motions and circular motion.

Here, are all the statements are correct. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].