Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

Study the following

List - I List - II
a) Fundamental unit I) rad
b) Derived unit II) Kg-Wt
c) Practical unit III) N
d) Supplementary unit IV) Kg

  1. a-I b-IV c-II d-III

  2. a-IV b-III c-II d-I

  3. a-I b-III c-IV d-I

  4. a-I b-II c-III d-IV
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fundamental unit $\rightarrow$ $Kg$
Derived unit $\rightarrow$ $N$
Practical unit $\rightarrow$ $Kg-Wt$
Supplementary unit $\rightarrow$ $rad$

Multiple choice physics light, shadows and images substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

Opaque objects:

  1. Allow the light to pass through them

  2. Do not let the light to pass through them

  3. Absorb some amount of light and let the remaining to pass through them

  4. Allows the light from natural sources and rejects if it is from artificial sources
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The majority of objects are opaque, which means you can't see through them. This is due to the fact that light can't pass through them. Examples of opaque objects include wood, gold, cement, metal, some types of coloured plastic, and so on.

Multiple choice detection and recording of x-ray images option c: imaging physics

The minimum value of Compton wavelength shift is:

  1. $h/2 m _{0}c$
  2. $h/m _{0}c$
  3. $2h/m _{0}c$
  4. $zero$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\lambda -\lambda ^{1}  =  \dfrac{h}{m _e c}\ (1+cos  \theta )$

$\Delta \lambda ^{1}  =  \dfrac{h}{m _e c}\ (1+cos  \theta )$

$cf   \theta = 0^{0}$

then  $\Delta \lambda = 0$

Multiple choice detection and recording of x-ray images option c: imaging physics

Consider a metal used to produced some characteristic $X-$rays. Energy of $X-$ray are given by $E$ and wavelength as represented by $\lambda$. Then which of the following is true:

  1. $E(K _{\alpha}) > E({K} _{\beta}) > E(K _{\gamma})$
  2. $E(M _{\alpha}) > E(L _{\alpha}) > E(K _{\alpha})$
  3. $\lambda (K _{\alpha}) > \lambda (K _{\beta}) > \lambda (K _{\gamma})$
  4. $\lambda (M _{ \alpha })>\lambda (L _{ \alpha })>\lambda (K _{ \alpha })$
Reveal answer Fill a bubble to check yourself
B Correct answer