Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

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 wave motion reflection of waves

The equation of a stationary wave is $Y=10\sin{\cfrac{\pi x}{4}}\cos{20\pi t}$. The distance between two consecutive nodes in meters is -

  1. 4

  2. 2

  3. 5

  4. 8
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Y = 10\sin \dfrac{{\pi x}}{4}\cos \pi t$

At nodles amplitude part is zero.
$\begin{array}{l} \Rightarrow 10\sin  \dfrac { { \pi x } }{ 4 } =0 \ \Rightarrow \dfrac { { \pi x } }{ 4 } =0,\pi ,2\pi  \ \Rightarrow x=0.x=4,x=8 \end{array}$
$\therefore 4$  is distance between two consultative node.
$\therefore$ Option $A$ is correct.

Multiple choice physics wave motion reflection of waves

The phase change between incident and reflected sound wave from a free end is

  1. $0$
  2. $\pi $
  3. $3\pi $
  4. $2\pi $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At a free and, the wave is reflected as it is with just as change in its direction of propagation 
$y= A  \sin  ( \omega t+kx)$
$y _r= A  \sin  (\omega t-kx)$
phase difference in time domain $= 0$

Multiple choice physics wave motion reflection of waves

Regarding open organ pipe, which of following is correct?

  1. Both ends are pressure antinodes

  2. Both ends are displacement nodes

  3. Both ends are pressure nodes

  4. Both (1)and (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Regarding open pipe both ends are pressure nodes.

So, option $C$ is correct.

Multiple choice physics wave motion reflection of waves

What characteristics of a point on the string will you use to find the location of the antinode

  1. displacement

  2. velocity

  3. wavelength

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

An antinode is a point on the string, where the amplitude at that point is maximum 

The correct option is (a)