# Laws of Motion (NEET Physics): Questions 19 - 23 of 114

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## Question number: 19

» Laws of Motion » Force and Inertia

### Question

A swimmer can swim in still water at a rate 4 km/h. If he swims in a river flowing at 3 km/h and keeps his direction (w. r. t. water) perpendicular to the current. Find his velocity w. r. t. the ground.

### Choices

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

a. | 3 km/hr | |

b. | 7 km/hr | |

c. | 5 km/hr | |

d. | 4 km/hr |

## Question number: 20

» Laws of Motion » Newton's Law » Newton's Third Law of Motion

### Assertion (Ꭺ)

A cloth covers a table. Some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table.

### Reason (Ꭱ)

To every action there is an equal and opposite reaction.

### Choices

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

a. | Ꭺ is false but Ꭱ is true | |

b. | Ꭺ is true but Ꭱ is false | |

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

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

## Question number: 21

» Laws of Motion » Momentum

### Question

A force of 4 N is applied on a particle for 3 sec, the change in momentum will be -

### Choices

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

a. | 4 Ns | |

b. | 6 Ns | |

c. | 12 Ns | |

d. | 3 Ns |

## Question number: 22

» Laws of Motion » Force and Inertia

### Question

A cane filled with water is revolved in a vertical circle of diameter 2 m and the water does not fall down n maximum period of revolution must be –

### Choices

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

a. | 14.15 | |

b. | 4.02 | |

c. | 1.45 | |

d. | 2.006 |

## Question number: 23

» Laws of Motion » Force and Inertia

### Question

A stone of mass 1 kg tied to a light inextensible string of length L = 10/3 m is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the suing is 4 and if g is taken to be 10m/sec2, the speed of the stone at the highest point of the circle is

### Choices

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

a. | 10√3m/Sec | |

b. | 10 m/sec | |

c. | 20 m/sec | |

d. | 5√2m/sec |