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# Young's modulus of steel is $$1.9 \times 10^{11} ~\text{N/m}^2$$. When expressed in CGS units of $$\text{dyne/cm}^2$$, it will be equal to: $$(1 \mathrm{~N}=10^5 \text { dyne, } 1~ \text{m}^2=10^4 ~\text{cm}^2)$$ 1. $$1.9 \times 10^{10}$$ 2. $$1.9 \times 10^{11}$$ 3. $$1.9 \times 10^{12}$$ 4. $$1.9 \times 10^9$$

Subtopic:  Dimensions |
73%
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If momentum ($${p}$$), area ($${A}$$), and time ($${T}$$) are taken to be fundamental quantities, then energy has the dimensional formula:
 1 $${\left[{pA}^{-1} {~T}^1\right]}$$ 2 $${\left[{p}^2 {AT}\right]}$$ 3 $${\left[{pA}^{-1 / 2} {~T}\right]}$$ 4 $${\left[{pA}^{1 / 2} {~T}^{-1}\right]}$$
Subtopic:  Dimensions |
76%
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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The mean length of an object is $$5~\text{cm}$$. Which of the following measurements is the most accurate?

 1 $$4.9~\text{cm}$$ 2 $$4.805~\text{cm}$$ 3 $$5.25~\text{cm}$$ 4 $$5.4~\text{cm}$$
Subtopic:  Errors |
80%
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Which of the following measurement is most precise?
1. $$5.00$$ mm
2. $$5.00$$ cm
3. $$5.00$$ m
4. $$5.00$$ km

Subtopic:  Errors |
83%
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