# Physics and Measurement-Errors in Measurement (NEET Physics): Questions 1 - 5 of 29

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## Question number: 1

» Physics and Measurement » Errors in Measurement

### Question

The resistance R = V/i where V = 100 + or - 5 volts and i = 10 + 0.2 amperes. What is the total error in R?

### Choices

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

a. | 7 % | |

b. | 5 % | |

c. | 5/2 % | |

d. | 5.2 % |

## Question number: 2

» Physics and Measurement » Errors in Measurement

### Question

If the length of rod A is 3.25 + 0.01 cm and that of B is 4.19 + 0.01 cm then the rod B is longer than rod A by

### Choices

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

a. | 0.94 + 0.00 cm | |

b. | 0.94 + 0.02 cm | |

c. | 0.94 + 0.01 cm | |

d. | None of the above |

## Question number: 3

» Physics and Measurement » Errors in Measurement

### Assertion (Ꭺ)

Out of three measurements *l* = 0.7 m; *l* = 0.70 m and *l* = 0.700 m, the last one is most accurate.

### Reason (Ꭱ)

In every measurement, only the last significant digit is not accurately known.

### Choices

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

a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |

b. | Ꭺ is false but Ꭱ is true | |

c. | Both Ꭺ and Ꭱ are false | |

d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |

## Question number: 4

» Physics and Measurement » Errors in Measurement

### Question

The period of oscillation of a simple pendulum is given by T = 2π

where *l* is about 100 cm and is known to have l mm accuracy. The period is about 2s. The time of 100 oscillations is measured by a stopwatch of least count 0.1s. The percentage error in g is

### Choices

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

a. | 0.8% | |

b. | 0.1% | |

c. | 1% | |

d. | 0.2% |

## Question number: 5

» Physics and Measurement » Errors in Measurement

### Question

The random error in the arithmetic mean of 100 observations is x; then random error in the arithmetic mean of 400 observations would be

### Choices

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

a. | 4x | |

b. | 2 x | |

c. | 0.25 x | |

d. | 0.5x |