Tag: motion and measurement

Quizzes (11) Questions (114)

Questions Related to motion and measurement

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

The prefixes $nano (n), micro (\mu)$ and $pico (p)$ are often used with units.
Which row shows their correct values?

  1. $n = 10^{-6}, \mu = 10^{-9}, p = 10^{-12}$
  2. $n = 10^{-6}, \mu = 10^{-12}, p = 10^{-9}$
  3. $n = 10^{-9}, \mu = 10^{-6}, p = 10^{-12}$
  4. $n = 10^{-12}, \mu = 10^{-9}, p = 10^{-6}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1 nano unit = $10^{-9}$ unit

1 $\mu$  unit= $10^{-6}$  unit
1 $p$ unit = $10^{-12}$  unit
So, option C is correct 

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system
Which definition is correct and uses only quantities rather than units?

  1. Density is mass per cubic metre

  2. Potential difference is energy per unit current

  3. Pressure is force per unit area

  4. Speed is distance traveled per second
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We know that 

Pressure $P= \dfrac{Force }{Area}$
So, option C is correct.

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

Which of the statements are false?

  1. The units of physical quantity represented by volume is $cm^3$
  2. The unit of physical quantity represented by mass is $ton$
  3. The work done is represented by $\dfrac{kg}{m}$
  4. The unit of physical quantity represented by weight is $Newton$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Work done is given by   $W = FS $
Thus work has the units of  $kg .m s^{-2}.m$
Thus statement given in option C is incorrect.

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

Which of the following statements below should be followed while using the symbol for a unit of a physical quantity?

  1. The symbol named after a scientist should begin with a capital letter.

  2. They can take plural forms.

  3. They can be written in full.

  4. They should be written only in the agreed symbols while using symbols.
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation
Basic rules for the use and writing for a  unit of a physical quantity are;
1. They symbol named after scientist should have the capital letter, 
2. They can be written in full 
3. They should be written only in the agreed symbols be used while using the symbol for a unit of a physical quantity. 
4. They cannot take plural forms.
Multiple choice physics motion and measurement measuring length measurement of small and large distances measurement of distance

Which one of the following methods is used to measure distance of a planet or a star from the earth?

  1. Echo method

  2. Parallax method

  3. Triangulation method

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun

Multiple choice physics motion and measurement measuring length measurement of small and large distances measurement of distance

'The parallax angle in radians is: $\theta = \left( 1 + \frac { 54 } { 60 } \right) \times \frac { \pi } { 180 } = 0.03316 \mathrm { rad }$
  Hence, the distance between moon and earth: 

  1. $\dfrac { \text { Diameter of Earth } } { \theta }$
  2. $\dfrac { 1.276 \times 10 ^ { 7 } m } { 0.03316 }$
  3. $3.84 \times 10 ^ { 8 } m$

  4. nnone of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given,

$\theta =0.03316\,\,rad$

Also $b = \mathrm { AB } =$ diameter of earth $= 1.276 \times 10 ^ { 7 } \mathrm { m }$

Now d $=\dfrac{b}{\theta }=\dfrac{1.276\times {{10}^{7}}}{0.03316\,}=3.84\times {{10}^{8}}\text{m}$

Hence, distance between earth and moon is $3.84\times {{10}^{8}}\text{m}$

Multiple choice physics motion and measurement measuring length measurement of small and large distances measurement of distance

Which of the following is the best method to measure microscopic distances?

  1. Optical microscope

  2. Meter scale

  3. Screw gauge

  4. Diffraction pattern
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Optical microscopes are enabled with objective fitted with lenses with different magnifications. This helps to magnify a small objects and so necessary measurements.