# Physics and Measurement (NEET Physics): Questions 56 - 59 of 61

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## Passage

Three of the fundamental constants of physics are the universal gravitational constant, G = 6.7 x 10 ^{-11 } m ^{3} kg ^{-1} s ^{-2}, the speed of light, c = 3.0 x 10 ^{8} m/s, and Planck’s constant,

h = 6.6 x 10 ^{-34} kg m ^{2} s ^{-1}.

## Question number: 56 (2 of 2 Based on Passage) Show Passage

» Physics and Measurement » Dimensions of Physical Quantities

### Question

Find the value of Planck time in seconds

The universal gravitational constant, G = 6.7 x 10 ^{-11} m ^{3} kg ^{-1} s ^{-2}, the speed of light, c = 3.0 x 10 ^{8} m/s, and Planck’s constant, h = 6.6 x 10 ^{-34} kg m ^{2} s ^{-1}.

### Choices

Choice (4) | Response | |
---|---|---|

a. |
2.3 10 | |

b. |
1.3 10 | |

c. |
1.3 10 | |

d. | None of the above |

## Question number: 57

» Physics and Measurement » Dimensional Analysis and Its Applications

### Question

In an experiment the angles are required to be measured using an instrument, 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half- a degree (= 0.5°), then the least count of the instrument is:

### Choices

Choice (4) | Response | |
---|---|---|

a. | half minute | |

b. | one minute | |

c. | one degree | |

d. | half degree |

## Question number: 58

» Physics and Measurement » Fundamental and Derived Units. Least Count

### Question

A Vernier caliper N divisions of Vernier scale coincides with N - 1 divisions of main scale (in which length of one division is 1 mm). The least count of the instrument should be

### Choices

Choice (4) | Response | |
---|---|---|

a. | 1 10 N | |

b. | N-1 | |

c. | N | |

d. | 1/N - 1 |

## Question number: 59

» Physics and Measurement » Accuracy and Precision of Measuring Instruments

### Question

A student performs an experiment for determination of . The error in length is ∆ and in time T is ∆ T and *n * is number of times the reading is taken. The measurement of *g * is most accurate for

### Choices

Choice (4) | Response | |
---|---|---|

a. | ∆l = 5mn, ∆ T = 0.2 sec, n = 10 | |

b. | ∆l = 5mn, ∆T = 0.2 sec, n = 20 | |

c. | ∆l = 5mn, ∆T = 0.1 sec, n = 10 | |

d. | ∆l = 1mn, ∆T = 0.1 sec, n = 50 |