# Kinematics (KVPY Stream-SA Physics): Questions 11 - 15 of 21

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## Question number: 11

» Kinematics » Relative Velocity

### Question

A thief is running away on a straight road with velocity 3 m/s. A policeman chases him with velocity 3.5 m/s. Initially the thief was 250 m ahead of the policeman. The time taken by policeman to catch the thief is –

### Choices

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

a. | 9 min | |

b. | 7 min 15 sec | |

c. | 7 min 50 sec | |

d. | 8 min 20 sec |

## Question number: 12

» Kinematics » Relative Velocity

### Question

A train of length *l* (165 m) is going towards north directional constant speed v_{1}=12 m/s. A parrot flies at a constant speed of v_{2} = 3 m/s towards south parallel to be railway track. The time taken by the parrot to cross the train is –

### Choices

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

a. | 15 s | |

b. | 18 s | |

c. | 11 s | |

d. | 9 s |

## Question number: 13

» Kinematics » Projectile Motion

### Question

The maximum height attained by a projectile is increased by 15 % by increasing its speed of projection, without changing the angle of projection. The percentage increase in the horizontal range will be –

### Choices

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

a. | 20 % | |

b. | 10% | |

c. | 15% | |

d. | 5% |

## Question number: 14

» Kinematics » Relative Velocity

### Question

A boat crossing a river moves with a velocity v relative to still water. The river is flowing with a velocity with respect to the bank. The angle with respect to the flow direction with which the boat should move to minimize the drift is–

### Choices

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

a. | 135 | |

b. | 60 | |

c. | 30 | |

d. | 120 |

## Question number: 15

» Kinematics » Frame of Reference

### Question

A train Y of 400 meter length travelling at 75 km/hr overtakes another train X of 200 meter length travelling at 50 km/hr velocity in the same direction. The time train Y takes to completely pass train X –

### Choices

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

a. | 76.32 sec | |

b. | 22.5 sec | |

c. | 86.4 sec | |

d. | 108.3 sec |