The energy required to break one bond in DNA is \(10^{-20}~\text{J}\). This value in eV is nearly: 
1. \(0.6\)
2. \(0.06\)
3. \(0.006\)
4. \(6\)

Subtopic:  Dimensions |
 71%
From NCERT
NEET - 2020
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Dimensions of stress are:
1. \( {\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]} \)
2. \( {\left[\mathrm{ML}^0 \mathrm{~T}^{-2}\right]} \)

3. \( {\left[\mathrm{ML}^{-1} \mathrm{~T}^{-2}\right]} \)
4. \( {\left[\mathrm{MLT}^{-2}\right]}\)

Subtopic:  Dimensions |
 79%
From NCERT
NEET - 2020
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The dimensions of pressure are the same as that of

(1) Energy

(2) Energy per unit area

(3) Force per unit area

(4) Force per unit volume

Subtopic:  Dimensions |
 78%
From NCERT
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Time intervals measured by a clock give the following readings: \(1.25\) s, \(1.24\) s, \(1.27\) s, \(1.21\) s, and \(1.28\) s. What is the percentage relative error of the observations?
1. \(2\)%
2. \(4\)%
3. \(16\)%
4. \(1.6\)%

Subtopic:  Errors |
 55%
From NCERT
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A calorie is a unit of heat (energy in transit) and it equals about \(4.2\) J where \(1\) J\(=1\) kg-m2s-2Suppose we employ a system of units in which the unit of mass equals \(\alpha\) kg the unit of length equals \(\beta\) m, and the unit of time is \(\gamma\) s then the magnitude of calories in terms of new units is:
1. \(4.2\alpha^{-2}\beta^{-2}\gamma^{2}\)
2. \(4.2\alpha^{2}\beta^{-2}\gamma^{2}\)
3. \(4.2\alpha^{-1}\beta^{-2}\gamma^{2}\)
4. 
\(4.2\alpha^{-1}\beta^{2}\gamma^{-2}\)

Subtopic:  Dimensions |
 68%
From NCERT
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Which of the following is the most precise device for measuring length?

1. a vernier calliper with \(20\) divisions on the sliding scale.
2. a screw gauge of pitch \(1\) mm and \(100\) divisions on the circular scale.
3. an optical instrument that can measure the length within a wavelength of light.
4. both (1) and (2)

Subtopic:  Measurement & Measuring Devices |
From NCERT
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The number of significant figures in \(0.0006032\) m2 is:

1. 4 2. 5
3. 7 4. 3
Subtopic:  Significant Figures |
 83%
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A physical quantity \(P\) is related to four observables \(a,\) \(b,\) \(c,\) and \(d\) as follows;   \(P=\frac{a^{3}b^{2}}{\sqrt{c}d}.\)
The percentage errors of measurement in \(a,\) \(b,\) \(c,\) and \(d\) are 1%, 3%, 4% and 2%, respectively. Then the percentage error in the quantity \(P\) is:
1. 12%
2. 13%
3. 14%
4. 15%

Subtopic:  Errors |
 75%
From NCERT
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When the planet Jupiter is at a distance of 824.7 million kilometres from the Earth, its angular diameter is measured to be 35.72” of arc. Then the diameter of Jupiter is:

1 1.34×109 m
2 1.43×109 m
3 1.34×108 m
4 1.43 ×108 m

Subtopic:  Measurement & Measuring Devices |
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Taking into account the significant figures, what is the value of \((9.99~\mathrm{m}-0.0099~\mathrm{m})\)?

1. \(9.98\) m 2. \(9.980\) m
3. \(9.9\) m 4. \(9.9801\) m
Subtopic:  Significant Figures |
 69%
From NCERT
NEET - 2020
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