Class 6 Science Chapter 10 MCQ

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

The distance between Delhi and Mumbai is expressed in kilometer because other units like meter, centimeter and decameter are so small to express this big distance.

The SI unit of measuring length is meter. 10,00,000 millimeter makes 1 kilometer. 1,00,000 centimeter makes 1 kilometer. 1,000 meter makes 1 kilometer. Thus, millimeter is the smallest unit of length and kilometer is the largest unit of length. But the SI unit of measuring length is “meter”. Note: When we measure the distance between celestial bodies (stars, galaxy, asteroids etc.) we use light year.

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.

We have to convert the height of 1.56 m into mm. Now, we know that: 1 meter = 1000 mm So, 1.56 m = 1000 x 1.56 mm = 1560 mm Thus, a height of 1.56 m is equal to 1560 millimeter

When an object turns or spins about a fixed axis, it is called rotational motion. When an object moves along a straight-line path it is called rectilinear motion. When a bicycle moves on a straight road, turning of bicycle wheel shows the rotational motion. And as it goes in a straight road, it exhibits the rectilinear motion.

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.

The thickness of a coin or a thin wire is a very small length which is much smaller than even centimeter. So, it is inconvenient to express very small length in terms of centimeters. Thus, to express the thickness of a coin or a thin wire we use millimeter as the unit of length. The very small length is expressed in still smaller units called a “millimeters”.

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

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.

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

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.

We know that, 1 hour = 60 x 60 = 3600 seconds (Thus, 1 minutes = 60 seconds and 60 minutes make an hour) 24 hour = 3600 x 24 = 86,400 seconds

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].

The various types of devices which are commonly used for measuring length are meter scale and measuring tape. If the object is round then we have to use a measuring tape for making measurement of length. As the girth of a tree can be measured only by using a measuring tape because a measuring tape can be bent around the tree. And plastic ruler, a meter scale or a meter rod is made of metal and cannot be bend at all.

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

The earth moves around the sun, so it has circular motion. The earth repeats its motion around the sun after regular intervals of time (means one year), 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.

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

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].

The process of finding an unknown quantity by comparing it with a known fixed quantity of the same kind, called measurement. And unit of measurement accepted universally, called the standard unit. But when we guess the amount of anything without actual measurement, called “Estimation”.