Measuring Length

Q. Identify the instrument(s) used to measure the length of an object.

1. Metre scale
2. Metre rod
3. Thermometer
4. Metre tape

Q. Why do we need SI units ?

Q.

Define light year.

Q.

How do you read a caliper?

Q.

Light year is the unit of measurement of

1. Speed of light

2. Distance between the stars

3. time

4. None of the above

Q.

Define a parallactic second?

Q. 10 coins are placed upon each other. If total height of the stack is $5cm$, what is the thickness of one coin?

1. $0.1cm$
2. $0.2cm$
3. $0.3cm$
4. $0.5cm$

Q. One angstrom is equal to _________ .

1. ${10}^{-12}m$
2. the time taken by Neil Armstrong to reach the moon
3. ${10}^{-10}m$
4. the distance travelled by Neil Armstrong on the surface of the moon

Q. The error that occurs when the length of an object is measured using a scale that has damaged zero mark is called:

1. Zero error
2. Numerical error
3. Parallax error
4. Angular error

Q. 10 coins are placed upon each other. If total height of the stack is $5cm$, what is the thickness of one coin?

1. $0.1cm$
2. $0.5cm$
3. $0.3cm$
4. $0.2cm$

Q. Which of the following units is used to measure distance between the stars?

1. $km$
2. $lightyear$
3. $m$
4. $fm$

Q. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

Q. 1 parsec is equal to

1. $3.1\times {10}^{-15}m$
2. $3.1\times {10}^{-16}m$
3. $3.1\times {10}^{16}m$
4. $3.1\times {10}^{15}m$

Q.

Take a one-metre rod and mark 4 points on it such that each segment is of equal length.

If OA is taken as X units, then the value of X equal to:

1. 20 cm

2. 2 m

3. 2000 mm

4. All of these

Q. The unit of length in the F.P.S. system is

1. foot
2. pound
3. none of these
4. metre

Q. $1km=$ ___ $cm$.

1. $10cm$
2. $1000cm$
3. $100000cm$
4. $100000cm$

Q. The number of fermi in $1$ meter is _____.

1. ${10}^{13}$
2. ${10}^{14}$
3. ${10}^{15}$
4. ${10}^{16}$

Q. The weight of a boy on an analog weighing machine was found out to be $62kg$. After stepping down from the machine, the boy realized that the needle pointed at $3kg$ instead of $0$. The correct weight of the boy is ________.

1. $65kg$
2. $59kg$
3. $56kg$
4. $68kg$

Q. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

1. 30 cm
2. 
   33.1 cm
3. 30.1 cm
4. 
   36.1 cm

Q. State whether the following statement is True or False.

1. True
2. False

Q. Parsec is a unit of time.

1. True
2. False

Q. Wavelength of ray of light is 0.00006 m . It is equal to

1. 6 microns
2. 60 microns
3. 600 microns
4. 0.6 microns

Q.

The magnitude of light year is

1. $9.46\times {10}^{12}km$

2. $4.96\times {10}^{12}km$

3. $9.64\times {10}^{12}km$

4. $6.94\times {10}^{12}km$

Q. Angstrom is a unit used to express

1. length
2. none of these
3. mass
4. time

Q. The average distance between the earth and the sun is termed as a/an

1. astronomical unit
2. light year
3. parallactic second
4. none of these

Q. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

Q. Light year is the unit of

1. time
2. distance
3. speed of light
4. intensity of light

Q. In which of the following lists are the units an order from LONGEST to SHORTEST?

1. light-year, kilometer, astronomical unit
2. kilometer, light-year, astronomical unit
3. astronomical unit, kilometer, light-year
4. light-year, astronomical unit, kilometer

Q. State whether the following statement is True or False.

1. True
2. False

Q. Fill in the blanks with the correct words:
_______ (kilometer/Cubit) is a non-standard unit of length.