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# Which two of the following five physical parameters have the same dimensions?  (1) Energy density  (2) Refractive index  (3) Dielectric constant  (4) Young's modulus  (5) Magnetic field Choose the correct option: 1. (2) and (4) 2. (3) and (5) 3. (1) and (4) 4. (1) and (5)

Subtopic:  Dimensions |
71%
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AIPMT - 2008
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Four students measure the height of a tower. Each student uses a different method and each measures the height many times. The data for each are plotted below. The measurement with the highest precision is:

 (I) (II) (III) (IV)

1. I
2. II
3. III
4. IV

Subtopic:  Errors |
58%
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In the expressions below: $$g$$ = gravitational acceleration; $$h$$ = height; $$m$$ = mass; $$R$$ = electrical resistance; $$t$$ = time; $$v$$ = velocity; $$V$$ = voltage. Which of the following expressions have units of power?
(a) $$\frac{mv^2}{2t}$$
(b) $$\frac{V^2}{R}$$
(c) $$\frac{mgh}{t}$$

 1 (a) and (b) only 2 (a) only 3 (b) and c) only 4 (a), (b) and (c)
Subtopic:  Dimensions |
72%
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On the basis of dimensions, decide which of the following relations for the displacement of a particle undergoing simple harmonic motion is/are not correct.

 (a) $$y = a\sin \left(2\pi t / T\right)$$ (b) $$y = a\sin(vt)$$ (c) $$y = \left({\dfrac a T}\right) \sin \left({\dfrac t a}\right)$$ (d) $$y = a \sqrt 2 \left(\sin \left({\dfrac {2 \pi t} T}\right) - \cos \left({\dfrac {2 \pi t} T}\right)\right)$$

(Symbols have their usual meanings.)
Choose the correct option:

 1 (a), (c) 2 (a), (b) 3 (b), (c) 4 (a), (d)

Subtopic:  Dimensions |
63%
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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)

Subtopic:  Dimensions |
55%
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Photon is a quantum of radiation with energy E = h$\mathrm{\nu }$, where $\mathrm{\nu }$ is the frequency
and h is Planck's constant. The dimensions of h are the same as that of the following quantities.

(a) linear impulse

(b) angular impulse

(c) linear momentum

(d) angular momentum

Choose the correct option:

1. (a, d)

2. (b, d)

3. (c, d)

4. (a, b)

Subtopic:  Dimensions |
71%
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If Planck's constant ($$h$$) and speed of light in a vacuum ($$c$$) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental quantities?

 (a) mass of electron ($$m_e$$) (b) universal gravitational constant ($$G$$) (c) charge of electron ($$e$$) (d) mass of proton ($$m_p$$)

Choose the correct option:
1. (a), (c), (d)
2. (a), (b), (d)
3. (a), (b), (c)
4. (b), (c), (d)
Subtopic:  Dimensions |
60%
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Which of the following ratios, express pressure?

 (a) force/area (b) energy/volume (c) energy/area (d) force/volume

Choose the correct option:

 1 (a), (c) 2 (a), (d) 3 (b), (d) 4 (a), (b)

Subtopic:  Dimensions |
76%
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The following is/are not a unit of time:

 (a) second (b) parsec (c) year (d) light year

Choose the correct option:

 1 (a, c, d) 2 (a, c) 3 (b, d) 4 (b, c)

Subtopic:  Dimensions |
78%
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Match List-I with List-II:

 List-I List-II (a) $$h$$ (Planck's constant) (i) $$\left[ MLT^{-1} \right]$$ (b) $$E$$ (kinetic energy) (ii) $$\left[ ML^{2}T^{-1} \right]$$ (c) $$V$$ (electric potential) (iii) $$\left[ ML^{2}T^{-2} \right]$$ (d) $$p$$ (linear momentum) (iv) $$\left[ ML^{2}A^{-1}T^{-3} \right]$$
Choose the correct option:
 1 (a) → (iii), (b) → (iv), (c) → (ii), (d) → (i) 2 (a) → (ii), (b) → (iii), (c) → (iv), (d) → (i) 3 (a) → (i), (b) → (ii), (c) → (iv), (d) → (iii) 4 (a) → (iii), (b) → (ii), (c) → (iv), (d) → (i)
Subtopic:  Dimensions |
90%
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