Medium
Fill in the blanks:
$(a)$ To measure the direct distance of a mountain,....... is used.
$(b)$ For the measurement of time,the ........... clock is the most accurate.
$(c)$ Rounding off $15.753$ to three significant figures gives ....... .
$(a)$ To measure the direct distance of a mountain,....... is used.
$(b)$ For the measurement of time,the ........... clock is the most accurate.
$(c)$ Rounding off $15.753$ to three significant figures gives ....... .
(A) Echo method or reflection method is used to measure the distance of a mountain.
$(b)$ Cesium atomic clock is the most accurate clock for the measurement of time.
$(c)$ To round off $15.753$ to three significant figures,we look at the fourth digit,which is $5$. Since the digit following the third significant figure $(7)$ is $5$ followed by non-zero digits $(3)$,we round up the third digit. Thus,$15.753$ becomes $15.8$.
$(b)$ Cesium atomic clock is the most accurate clock for the measurement of time.
$(c)$ To round off $15.753$ to three significant figures,we look at the fourth digit,which is $5$. Since the digit following the third significant figure $(7)$ is $5$ followed by non-zero digits $(3)$,we round up the third digit. Thus,$15.753$ becomes $15.8$.
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Similar Questions
If the gravitational force,electromagnetic force,strong nuclear force,and weak nuclear force are represented by $GF, EMF, SNF$,and $WNF$ respectively,then which of the following represents the correct order of their relative strengths?
Easy
View SolutionSome physical quantities are given in Column $I$ and some possible $SI$ units in which these quantities may be expressed are given in Column $II$. Match the physical quantities in Column $I$ with the units in Column $II$.
Column $I$ Column $II$ $(A)$ $GM_e M_s$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$M_s$: mass of the Sun) $(p)$ $(\text{volt})(\text{coulomb})(\text{metre})$ $(B)$ $\frac{3RT}{M}$ ($R$: universal gas constant,$T$: absolute temperature,$M$: molar mass) $(q)$ $(\text{kg})(\text{m})^3(\text{s})^{-2}$ $(C)$ $\frac{F^2}{q^2 B^2}$ ($F$: force,$q$: charge,$B$: magnetic field) $(r)$ $(\text{m})^2(\text{s})^{-2}$ $(D)$ $\frac{GM_e}{R_e}$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$R_e$: radius of the earth) $(s)$ $(\text{farad})(\text{volt})^2(\text{kg})^{-1}$
| Column $I$ | Column $II$ |
| $(A)$ $GM_e M_s$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$M_s$: mass of the Sun) | $(p)$ $(\text{volt})(\text{coulomb})(\text{metre})$ |
| $(B)$ $\frac{3RT}{M}$ ($R$: universal gas constant,$T$: absolute temperature,$M$: molar mass) | $(q)$ $(\text{kg})(\text{m})^3(\text{s})^{-2}$ |
| $(C)$ $\frac{F^2}{q^2 B^2}$ ($F$: force,$q$: charge,$B$: magnetic field) | $(r)$ $(\text{m})^2(\text{s})^{-2}$ |
| $(D)$ $\frac{GM_e}{R_e}$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$R_e$: radius of the earth) | $(s)$ $(\text{farad})(\text{volt})^2(\text{kg})^{-1}$ |
$A$ wheel completes $2000$ revolutions to cover a distance of $9.5\, km$. The diameter of the wheel is:
Easy
View SolutionRead each statement below carefully and state,with reasons and examples,if it is true or false:
$A$ scalar quantity is one that
$(a)$ is conserved in a process
$(b)$ can never take negative values
$(c)$ must be dimensionless
$(d)$ does not vary from one point to another in space
$(e)$ has the same value for observers with different orientations of axes.
$A$ scalar quantity is one that
$(a)$ is conserved in a process
$(b)$ can never take negative values
$(c)$ must be dimensionless
$(d)$ does not vary from one point to another in space
$(e)$ has the same value for observers with different orientations of axes.
Medium
View SolutionMatch the List-$I$ with List-$II$:
List-$I$ List-$II$ $A$. Spring constant $I$. $ML^2 T^{-2} K^{-1}$ $B$. Thermal conductivity $II$. $ML^0 T^{-2}$ $C$. Boltzmann constant $III$. $ML^2 T^{-3} A^{-2}$ $D$. Inductive reactance $IV$. $MLT^{-3} K^{-1}$
Choose the correct answer from the options given below:
| List-$I$ | List-$II$ |
| $A$. Spring constant | $I$. $ML^2 T^{-2} K^{-1}$ |
| $B$. Thermal conductivity | $II$. $ML^0 T^{-2}$ |
| $C$. Boltzmann constant | $III$. $ML^2 T^{-3} A^{-2}$ |
| $D$. Inductive reactance | $IV$. $MLT^{-3} K^{-1}$ |
Choose the correct answer from the options given below:
DifficultJEE MAIN 2026
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