# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 121 - 125 of 2320

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## Question number: 121

» Kinematics » Motion in a Straight Line

### Question

A particle moves towards east with velocity 5 m/s. After 10 seconds its direction changes towards north with same velocity. The average acceleration of the particle is

### Choices

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

a. | m/s | |

b. | zero | |

c. | m/s | |

d. | m/s |

## Question number: 122

» Kinematics » Motion in a Straight Line

### Question

A 120 m long train is moving towards west with a speed of 10 m/s. A bird flying towards east with a speed of 5 m/s crosses the train. The time taken by the bird to cross the train will be

### Choices

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

a. | 8 sec | |

b. | 16 sec | |

c. | 14 sec | |

d. | 12 sec |

## Question number: 123

» Kinematics » Motion in a Straight Line

### Question

P, Q and R are three coplanar forces acting at a point and are in equilibrium. Given P = 1.9318 kg wt, sin Q = 0.9659, the value of R is (in kg wt)

### Choices

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

a. | 1 | |

b. | 0.9659 | |

c. | 2 | |

d. | 0.5 |

## Question number: 124

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

### Assertion (Ꭺ)

The sum of two vectors can be zero.

### Reason (Ꭱ)

Two vectors cancel each other, when they are equal and opposite.

### Choices

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

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

b. | Both Ꭺ and Ꭱ are false | |

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

d. | Ꭺ is true but Ꭱ is false |

## Question number: 125

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

What is the value of linear velocity, if co = 3i -4j + k and r = 5i - 6j + 6k

### Choices

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

a. | 6 - 2 + 3 | |

b. | 6 - 2 + 8 | |

c. | -18 - 13 + 2 | |

d. | 4 - 13 + 6 |