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CBSE Questions for Class 6 Physics Motion And Measurement Of Earth Quiz 3 - MCQExams.com
CBSE
Class 6 Physics
Motion And Measurement Of Earth
Quiz 3
The SI unit of length is the:
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Millimetre
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Centimetre
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Metre
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Kilometre
Explanation
Metre is the SI unit of length.
Which of the following is true for meter scale?
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It can measure upto $$1 cm$$
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It can measure upto $$1 m$$
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It can measure upto $$1 mm$$
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None of these
Explanation
Meter scale can measure upto $$1 \ mm$$ as the length between two consecutive lines is $$1 \ mm$$.
Name the type motion of A flying insect
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Random motion (Irregular motion)
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Circular motion
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Rolling motion
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Purely translation motion
Explanation
A flying insect is an example of random motion (irregular motion). Because it can change its motion in any direction at instant of time also it can keep rest in air.
M
otion which repeats itself after regular intervals is called
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oscillatory motion
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vibratory motion
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periodic motion
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none
Explanation
Motion which repeats itself after regular intervals of time
is known as periodic motion. It can be uniform circular motion, oscillating pendulum. The necessary condition for periodic motion is that the time period of each repeating motion should be same (constant).
Oscillatory motion and vibratory motion is to-and-fro motion which must involve motion between two extreme positions. The motion may or may not repeat itself at fixed intervals of time, i.e. the time period may or may not be constant.
State whether given statement is True or False.
The motion of the moon around the earth is a curvilinear motion
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True
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False
Explanation
Motion of the moon around the earth is a circular motion.
Thus the above statement is false.
Smoke particles from a chimney exhibit :
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Random or irregular motion
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Circular motion only
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Linear motion only
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Rotational motion only
Explanation
Smoke particles from the chimney have velocities in different direction and thus they exhibit random or irregular motion.
Big division of metre scale is known as :
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mililitre
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metre
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centimetre
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decimetre
Explanation
Length is measured by using a metre scale. A meter scale is divided into 100 equal parts,called centimetres
.
Which of the following is not a characteristic of the standard unit?
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It should be of convenient size
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It should change with respect to space and time
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It should not be perishable
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It should be easily reproducible
Explanation
A standard unit is the one which can be measured conveniently but must not change with space and time i.e. it should remain same with respect to space and time.
CNG is preferred over petrol as a fuel for transport vehicles. Why?
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It is a renewable source of energy
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It is less polluting
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It can be compressed under high pressure
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It undergoes complete combustion
Explanation
CNG (compressed natural gas) is the cleanest of all fossil fuels. It produces harmless gases as compared to petrol, coal, or diesel to the environment. Hence CNG is preferred over petrol coal and diesel. It is also not very costly as compared to petrol and diesel.
In the fig below, the length of the object is:
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3.4 units
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3.5 units
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3.6 units
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3.3 units
Explanation
There are 10 divisions in between 1 unit. So each division is $$1/10=0.1 $$ unit.
In the figure, the starting point of the object is zero and the final end of the object is coinciding with 35 marks.
Thus, the length of the object will be ($$35\times 0.1$$)= $$3.5$$ units.
Rectilinear motion is a motion that occurs in :
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Straight line
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Plane
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Both A and B
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None
Explanation
The rectilinear motion is a straight line motion or one dimensional motion.
The comparison of an unknown quantity with a known constant quantity is known as :
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Unit
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Scale
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Magnitude
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Measurement
Explanation
The standard quantity (constant quantity) used for comparison is called unit. Measurement is the comparison of an unknown quantity with a known standard quantity (constant quantity) or unit.
Smallest division of a metre scale is known as:
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Millimetre
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Metre
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Centimetre
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Decimetre
Explanation
Length is measured by using a metre scale. A metre scale is divided into $$100$$ parts, called centimetres. Each centimetre is further divided into $$10$$ parts known as millimetres.
Metre scale have bevelled edges because:
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To increase the grip between scale and the measured surface
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To avoid errors due to parallax
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To look good
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None of these
Explanation
Parallax error occurs when the measurement of an object's length is more or less than the true length because of your eye being positioned at an angle to the measurement markings.
The green rectangular-shaped object pictured below is being measured. Its left end is perfectly lined up with $$0\ m$$ on the measuring tape.
Which of the following is the best and most precise length of the green, rectangular-shaped object that can be obtained, using the measuring tape?
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$$2.0\ m$$
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$$2.4\ m$$
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$$2.37\ m$$
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$$2.377\ m$$
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$$2.5\ m$$
Explanation
Least count of the measuring tape $$LC = 0.1$$ m
From figure, the end of the green rectangular object lies between $$2.3$$ m and $$2.4$$ m but it is very close to $$2.4$$ m.
Hence the length of the object is $$2.4$$ $$m$$
We should not use plurals when we write the unit in words.
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True
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False
Explanation
The above statement is true that we should not use plurals when we write the units in words.
The standard quantity used for comparison is called a _______.
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Unit
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Quality
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Pick
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Coin
Explanation
The measurement means the comparison of an unknown quantity with some known quantity. This known fixed quantity is called a unit.
State whether the given statement is TRUE or FALSE.
The total height of 10 identical coins each of thickness 0.5 cm placed one over the other will be
50 mm.
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True
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False
Explanation
Thickness of each coin $$t = 0.5 \ cm$$
Number of identical coin $$N = 10$$
Thus, the total height $$h = tN = 0.5\times 10 = 5 \ cm = 50 \ mm$$
So, the given statement is true.
The length of a curved surface is measured by using
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metre scale only
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thread only
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both metre scale and thread
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none of these
Explanation
For the measuring of length of a curved surface, first take the measure of length using a thread and then find out the numerical value of that length of thread using scale. This numerical value will give the length of the curved surface. Thus, both thread and scale are used to find out the length of a curved surface.
State whether true or false.
Motion of an ant on a floor along the edges is an example of translatory motion.
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True
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False
Explanation
The given statement is true that the motion of an ant on a floor along the edges is an example of translatory motion. Because when moving along an edge it is moving in a straight line.
For measuring a curve line which of the following can be used?
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A non-stretchable string
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A thread with a knot at one of it's ends.
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A straight rod
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Both A and B
Explanation
Since the line to be measured is curved it can not be measured by a straight rod . It can be measured by any scale which can bent and not stretch.So Either a non-stretchable string or a thread with a knot at one of its ends can be used for measuring the curved line. But a curved line cannot be measured with a straight rod.
Someone is weighing some box as 25 ____. Fill in the blank with appropriate answer.
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Kilogram
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Meter
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Seconds
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Joules
Explanation
Kilogram is the measuring unit of the weight of the object.
So, the correct answer is option A.
Which of the following is/are examples of linear motion?
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Motion of a molecule of a gas
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Motion of a stone falling from a certain height
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Motion of a swing
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Motion of a clock hand
Explanation
The motion of the stone falling from a certain height is an example of linear motion as it moves in a straight line.
Gas molecules have random motion. The swing and clock hand are in periodic motion.
Name the type of motion in which a body moves along a straight path.
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Linear motion
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Rotational motion
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Brownian motion
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Circular motion
Explanation
The body moves along a straight path in linear motion.
What we say when a body remains in one position for a long time?
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Motion
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Rest
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Stationary
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None of the above
Explanation
A body is said to be at rest if it remains in one position for a long time.
Vinita wants to measure the length of the snake shown. Which of the following she should use to get the exact length of the snake?
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0%
0%
0%
Explanation
The length of a curve line can be measured with a thread but cannot be measured with steel rod, metre scale and measuring tape. Since, the shape of the snake is a curved line as shown, thus its length can be measured accurately with a thread.
For measuring a pencil box which of the following is suitable?
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Long 30 cm scale
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Small 15 cm scale
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A tape of 5m length
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None of the above
Explanation
A pencil box is not a very big object. Its dimension is of the order of few centimetres.
Thus, small 15 cm metre scale is suitable for measuring a pencil box.
Which of the following is/are correct?
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Thread can be used to measure length of a zig-zag path
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Wooden scale of $$30cm$$ can be used to measure the length of a small table
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Tape can be used to measure the length of shoe size
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All of the above
Explanation
$$\begin{array}{l}\text { Thread has a fixed length but can be } \\\text { bent into any } 2D \text { shape , so it can used } \\\text { for be measure length of a zigzag path }\\\text { wooden scale canbe used to measure any straight }\\\text { object. } \\\text { Tape can be used to measure the length of } \\\text { shoe size. }\end{array}$$
Which of the following is not true about the method of measuring a curve line?
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Take a non-stretchable string or a thread and tie a knot at one of its ends
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Place the knotted end of the thread at one end of the curved line
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Holding the thread steadily with your fingers, stretch it along the curved line until you reach the other end
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None of the above
Explanation
A curved line or surface cannot be measured by a straight scale, a measuring tape or thread must be used instead.To measure a curved line using a thread, follow the below steps:
Tie a knot at one end of the thread.
Place the thread at the beginning of the line and try to measure a small initial portion of the line which is relatively straight.
Place your thumb at the other end of the measured portion and measure next straighter portion.
Repeat the above step till the end of line is reached. Make a knot at the end of the line.
Now, straighten the thread and measure the length of the two knots on a scale.
All the three steps given above to measure the curve line are correct. So, option D is correct.
In ancient time people used which of the following to measure length?
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Wooden scale
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Metre tape
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Hand span
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All of the above
Explanation
In the ancient time, people used hand span to measure the length of object.
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