Q. No.| 1. | both units and dimensions |
| 2. | units but no dimensions |
| 3. | dimensions but no units |
| 4. | no units and no dimensions |
The acceleration due to gravity on the surface of the earth is \(g=10\) m/s2. The value in km/(minute)2 is:
1. \(36\)
2. \(0.6\)
3. \(\frac{10}{6}\)
4. \(3.6\)
\(5.74\) g of a substance occupies \(1.2~\text{cm}^3\). Its density by keeping the significant figures in view is:
1. \(4.7333~\text{g/cm}^3\)
2. \(3.8~\text{g/cm}^3\)
3. \(4.8~\text{g/cm}^3\)
4. \(3.7833~\text{g/cm}^3\)
| 1. | pressure if \(a=1,\) \(b=-1,\) \(c=-2\) |
| 2. | velocity if \(a=1,\) \(b=0,\) \(c=-1\) |
| 3. | acceleration if \(a=1,\) \(b=1,\) \(c=-2\) |
| 4. | force if \(a=0,\) \(b=-1,\) \(c=-2\) |
| 1. | \(\alpha t / \beta \) | 2. | \(\alpha \beta t \) |
| 3. | \(\alpha \beta / t \) | 4. | \(\beta t / \alpha\) |
IF \(P, Q\) and \(R\) are physical quantities, having different dimensions, which of the following combination/s can never be a meaningful quantity?
(a) \((P – Q)/R\)
(b) \(PQ – R\)
(c) \(PQ /R\)
(d) \((PR – Q^2)/R\)
(e) \((R + Q)/P\)
Choose the correct option:
1. (a), (e)
2. (a), (d), (e)
3. (a), (c), (d)
4. (b), (d)
| 1. | Dimensions of \(\beta\) are same as that of force. |
| 2. | Dimensions of \(\alpha^{-1}x\) are same as that of energy. |
| 3. | Dimensions of \(\eta^{-1} \sin \theta\) are same as that of \(\alpha \beta\). |
| 4. | Dimensions of \(\alpha\) same as that of \(\beta\). |
Given below are two statements:
| Assertion (A): | A dimensionally incorrect equation cannot ever be correct. |
| Reason (R): | Physically correct equations must be dimensionally correct. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
The velocity \(v\) of a particle at time \(t\) is given by \(v=at+\dfrac{b}{t+c}\), where \(a,\) \(b\) and \(c\) are constants. The dimensions of \(a,\) \(b\) and \(c\) are respectively:
1. \(\left[{LT}^{-2}\right],[{L}] \text { and }[{T}]\)
2. \( {\left[{L}^2\right],[{T}] \text { and }\left[{LT}^2\right]} \)
3. \( {\left[{LT}^2\right],[{LT}] \text { and }[{L}]} \)
4. \( {[{L}],[{LT}] \text { and }\left[{T}^2\right]}\)
The impedance of the \({RL}\) circuit given in the adjacent figure is expressed by the relation \({Z}^2={A}^2+{B}^2\). Then the dimensions of \({AB}\) are :
1. \(\left[\mathrm{M^1 ~L^2 ~T}^2 ~A^{-3}\right] \)
2. \(\left[\mathrm{M^2 ~L^4 ~T^{-6} ~A^{-4}}\right]\)
3. \(\left[\mathrm{ML^{-1} ~T^2 ~A}^{-3}\right]\)
4. \(\left[\mathrm{M^{-1} ~L^{-2}~T}^2 \mathrm{~A}^4\right]\)
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