# NEET Physics: Questions 67 - 71 of 2099

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## Question number: 67

» Physics and Measurement » Errors in Measurement

### Question

Error in the measurement of radius of a circle is 1%. The error in the calculated value of its area is

### Choices

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

a. | 3% | |

b. | 2% | |

c. | 7% | |

d. | 1% |

## Question number: 68

» Kinematics » Motion in a Straight Line

### Question

a particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is

### Choices

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

a. | 5.0 m/s | |

b. | 5.5 m/s | |

c. | 4.8 m/s | |

d. | 4.0 m/s |

## Question number: 69

» Physics and Measurement » Errors in Measurement

### Question

A physical quantity A is related to four observable a, b, c and d as follows, A =

the percentage errors of measurement in a, b, c and d are 1%, 3%, 2 % and 2 % respectively. What is the percentage error in the quantity A?

### Choices

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

a. | 14% | |

b. | 7% | |

c. | 5% | |

d. | 12% |

## Question number: 70

» Kinematics » Motion in a Straight Line

### Question

A plane is to fly due north. The speed of the plane relative to the air is 200 km/h, and the wind is blowing from west to east at 90 km/h.

(1) The plane should head in a direction of sin-1 (0.45)

(2) The plane should head in a direction of sin-1 (0.60)

(3) The relative velocity of plane w. r. t. ground is 179 km/h

(4) The relative velocity of plane w. r. t. ground is 149 km/h

### Choices

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

a. | 1 and 2 | |

b. | 1, 2 and 3 | |

c. | 2 and 4 | |

d. | 1 and 3 |

## Question number: 71

» Kinematics » Average Speed and Instantaneous Velocity

### Assertion (Ꭺ)

The magnitude of velocity of two boats relative to river is same. Both boats start simultaneously from same point on the bank may reach opposite bank simultaneously moving along different paths.

### Reason (Ꭱ)

For boats to cross the river in same time. The component of their velocity relative to river in direction normal to flow should be same.

### Choices

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

a. | Ꭺ is true but Ꭱ is false | |

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 |