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The dimensional formula of the coefficient of thermal conductivity is :

1. $\left[{\mathrm{M}}^{1}{\mathrm{L}}^{1}{\mathrm{T}}^{-3}{\mathrm{K}}^{-1}\right]$

2. $\left[{\mathrm{M}}^{3}{\mathrm{L}}^{-1}{\mathrm{T}}^{-3}\mathrm{K}\right]$

3. $\left[{\mathrm{M}}^{1}{\mathrm{L}}^{-3}{\mathrm{T}}^{-1}{\mathrm{K}}^{-1}\right]$

4. $\left[{\mathrm{M}}^{1}{\mathrm{L}}^{1}{\mathrm{T}}^{-3}\mathrm{K}\right]$

Subtopic: Dimensions |

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If L,Q,R represent inductance, charge and resistance respectively, the units of

**[This question includes concepts from 12th syllabus]**

1. $\frac{QR}{L}$ will be those of current

2. $\frac{{Q}^{2}{R}^{3}}{{L}^{2}}$ will be those of energy

3. $\frac{QL}{R}$ will be those of current

4. $\frac{{Q}^{3}{R}^{2}}{L}$ will be those of power ** **

Subtopic: Dimensions |

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The quantity $\frac{1}{2}{\in}_{0}{E}^{2}$ has dimensional formula same as **[This question includes concepts from 12th syllabus]**

1. $\frac{1}{2}C{V}^{2}$

2. $\frac{1}{2}L{I}^{2}$

3. $\frac{1}{2}\frac{{B}^{2}}{{\mu}_{0}}$

4. Power

Subtopic: Dimensions |

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A light-year is a unit of:

1. Time

2. Mass

3. Distance

4. Energy

Subtopic: Measurement & Measuring Devices |

74%

From NCERT

PMT - 1989

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The magnitude of any physical quantity:

1. | depends on the method of measurement. |

2. | does not depend on the method of measurement. |

3. | is more in the SI system than in the CGS system. |

4. | is directly proportional to the fundamental units of mass, length and time. |

Subtopic: Dimensions |

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Which of the following is not equal to *watt* ?

(1) *Joule*/*second*

(2) *Ampere $\times $ volt*

(3) (*Ampere*)^{2} *$\times $ *ohm

(4) *Ampere*/*volt *

Subtopic: Dimensions |

From NCERT

PMT - 1990

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Newton–*second* is the unit of

(1) Velocity

(2) Angular momentum

(3) Momentum

(4) Energy

Subtopic: Dimensions |

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PMT - 1984

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Which of the following is not represented in correct unit

(1) $\frac{\text{Stress}}{\text{Strain}}=N\text{}/\text{}{m}^{2}$

(2) Surface tension = $N\text{}/\text{}m$

(3) Energy $=kg\text{-}m\text{}/\text{}\mathrm{sec}$

(4) Pressure $=N\text{}/\text{}{m}^{2}$

Subtopic: Dimensions |

59%

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One *second* is equal to :

(1) 1650763.73 time periods of $Kr$ clock

(2) 652189.63 time periods of $Kr$ clock

(3) 1650763.73 time periods of $Cs$ clock

(4) 9192631770 time periods of $Cs$ clock

Subtopic: Dimensions |

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One nanometre is equal to:

(1) ${10}^{9}mm$

(2) ${10}^{-6}\text{\hspace{0.17em}}cm$

(3) ${10}^{-7}cm$

(4) ${10}^{-9}cm$

Subtopic: Dimensions |

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