Medium
State whether the following statements are true or false:
$(a)$ Weight is a fundamental physical quantity.
$(b)$ $A$ micrometer is used to measure the size of an oleic acid molecule at the molecular level.
$(c)$ The dimensions of a derived quantity obtained from any fundamental quantity can never be zero.
$(a)$ Weight is a fundamental physical quantity.
$(b)$ $A$ micrometer is used to measure the size of an oleic acid molecule at the molecular level.
$(c)$ The dimensions of a derived quantity obtained from any fundamental quantity can never be zero.
- ATrue
- BFalse
- CCannot be determined
- DNone of the above
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Similar Questions
Match List $I$ with List $II$ :
List $I$ (Physical Quantity) List $II$ (Dimensional Formula) $(A)$ Pressure gradient $(I)$ $[M^0 L^2 T^{-2}]$ $(B)$ Energy density $(II)$ $[M^1 L^{-1} T^{-2}]$ $(C)$ Electric Field $(III)$ $[M^1 L^{-2} T^{-2}]$ $(D)$ Latent heat $(IV)$ $[M^1 L^1 T^{-3} A^{-1}]$
Choose the correct answer from the options given below:
| List $I$ (Physical Quantity) | List $II$ (Dimensional Formula) |
|---|---|
| $(A)$ Pressure gradient | $(I)$ $[M^0 L^2 T^{-2}]$ |
| $(B)$ Energy density | $(II)$ $[M^1 L^{-1} T^{-2}]$ |
| $(C)$ Electric Field | $(III)$ $[M^1 L^{-2} T^{-2}]$ |
| $(D)$ Latent heat | $(IV)$ $[M^1 L^1 T^{-3} A^{-1}]$ |
Choose the correct answer from the options given below:
In the context of accuracy of measurement and significant figures in expressing results of experiment,which of the following is/are correct?
$(1)$ Out of the two measurements $50.14 \, cm$ and $0.00025 \, A$,the first one has greater accuracy.
$(2)$ If one travels $478 \, km$ by rail and $397 \, m$ by road,the total distance travelled is $478 \, km$.
$(1)$ Out of the two measurements $50.14 \, cm$ and $0.00025 \, A$,the first one has greater accuracy.
$(2)$ If one travels $478 \, km$ by rail and $397 \, m$ by road,the total distance travelled is $478 \, km$.
Medium
View SolutionState,for each of the following physical quantities,if it is a scalar or a vector: volume,mass,speed,acceleration,density,number of moles,velocity,angular frequency,displacement,angular velocity.
Easy
View SolutionMatch the entries in List-$I$ with those in List-$II$.$A$. Unified interaction reducing the number of fundamental forces from four to three $(i)$ Strong interaction $B$. Force between two molecules separated by a distance near about the sum of the molecular radii $(ii)$ Gravitational force $C$. Nuclear binding force $(iii)$ Electroweak interaction $D$. Bodies of astronomical proportions $(iv)$ Electromagnetic interaction
| $A$. Unified interaction reducing the number of fundamental forces from four to three | $(i)$ Strong interaction |
| $B$. Force between two molecules separated by a distance near about the sum of the molecular radii | $(ii)$ Gravitational force |
| $C$. Nuclear binding force | $(iii)$ Electroweak interaction |
| $D$. Bodies of astronomical proportions | $(iv)$ Electromagnetic interaction |
The distance of a galaxy is of the order of $10^{25} \ m$. Calculate the order of magnitude of time taken by light to reach us from the galaxy.
Medium
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