A calorie is a unit of heat (energy in transit) and it equals about 4.2 J where$1J=1kg{m}^{2}{s}^{-2}$. Suppose we employ a system of units in which the unit of mass equals $\alpha kg$, the unit of length equals β m, the unit of time is γ s. Then the magnitude of calorie in terms of new units is:

$1.4.2{\alpha}^{-2}{\beta}^{-2}{\gamma}^{2}\phantom{\rule{0ex}{0ex}}2.4.2{\alpha}^{2}{\beta}^{-2}{\gamma}^{2}\phantom{\rule{0ex}{0ex}}3.4.2{\alpha}^{-1}{\beta}^{-2}{\gamma}^{2}\phantom{\rule{0ex}{0ex}}4.4.2{\alpha}^{-1}{\beta}^{2}{\gamma}^{-2}$

Subtopic: Dimensions |

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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

From NCERT

Subtopic: Measurement & Measuring Devices |

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The number of significant figure in 0.0006032 ${m}^{2}$ is:

$\left(1\right)4\phantom{\rule{0ex}{0ex}}\left(2\right)5\phantom{\rule{0ex}{0ex}}\left(3\right)7\phantom{\rule{0ex}{0ex}}\left(4\right)3$

81%

Subtopic: Significant Figures |

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A physical quantity P is related to four observables a, b, c, and d as follows :

$\mathrm{P}=\frac{{\mathrm{a}}^{3}{\mathrm{b}}^{2}}{\sqrt{\mathrm{c}}\mathrm{d}}$

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:

$\left(1\right)12\%\phantom{\rule{0ex}{0ex}}\left(2\right)13\%\phantom{\rule{0ex}{0ex}}\left(3\right)14\%\phantom{\rule{0ex}{0ex}}\left(4\right)15\%$

Subtopic: Errors |

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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:

$\left(1\right)1.34\times {10}^{9}m\phantom{\rule{0ex}{0ex}}\left(2\right)1.43\times {10}^{9}m\phantom{\rule{0ex}{0ex}}\left(3\right)1.34\times {10}^{8}m\phantom{\rule{0ex}{0ex}}\left(4\right)1.43\times {10}^{8}m$

Subtopic: Measurement & Measuring Devices |

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A new unit of length is chosen such that the speed of light in the vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 sec to cover this distance?

(1) 500 new units of length.

(2) 100 new units of length.

(3) 300 new units of length.

(4) 200 new units of length.

62%

Subtopic: Dimensions |

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A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3.5 mm. The thickness of the hair is:

(1) 0.035 mm

(2) 0.0035 mm

(3) 0.35 mm

(4) 3.5 mm

62%

Subtopic: Measurement & Measuring Devices |

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The photograph of a house occupies an area of $1.75c{m}^{2}$ on a 35 mm slide. The slide is projected onto a screen, and the area of the house on the screen is $1.55{m}^{2}$. What is the linear magnification of the projector-screen arrangement?

(1) 90.0

(2) 94.1

(3) 99.9

(4) 97.7

56%

Subtopic: Measurement & Measuring Devices |

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The length, breadth, and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. The volume of the sheet to correct significant figures is:

1. 0.00856 ${m}^{3}$

2. 0.0856 ${m}^{3}$

3. 0.00855 ${m}^{3}$

4. 0.0855 ${m}^{3}$

Subtopic: Significant Figures |

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Which one of the following formulas is dimensionally incorrect?

$\left(1\right)\mathrm{y}=\mathrm{asin}\frac{2\mathrm{\pi t}}{\mathrm{T}}\phantom{\rule{0ex}{0ex}}\left(2\right)\mathrm{y}=\frac{\mathrm{a}}{\sqrt{2}}\left(\mathrm{sin}\frac{2\mathrm{\pi t}}{\mathrm{T}}+\mathrm{cos}\frac{2\mathrm{\pi t}}{\mathrm{T}}\right)\phantom{\rule{0ex}{0ex}}\left(3\right)\mathrm{y}=\mathrm{asinvt}\phantom{\rule{0ex}{0ex}}\left(4\right)\mathrm{y}=\mathrm{asin}\left(\frac{2\mathrm{\pi t}}{\mathrm{T}}+\mathrm{\pi}\right)$

57%

Subtopic: Dimensions |

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