# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 136 - 142 of 2320

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## Question number: 136

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

the vector P = ai + aj + 3k and Q = ai - 2j - k are perpendicular to each other. The positive value of a is

### Choices

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

a. | 3 | |

b. | 13 | |

c. | 9 | |

d. | 4 |

## Question number: 137

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

A particle moves from position 3i + 2j-6k to 14i + 13j + 9k due to a uniform force of (4i + j + 3k) N. If the displacement in metres then work done will be

### Choices

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

a. | 200 J | |

b. | 300 J | |

c. | 100 J | |

d. | 250 J |

## Question number: 138

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

If|AxB|=| A. B|, then angle between A and S will be

### Choices

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

a. | 30 | |

b. | 45° | |

c. | 60° | |

d. | All of the above |

## Passage

A particle moves along x-axis and its acceleration at any time t is a = 2 sin (πt), where t is in seconds and a is in m/s ^{2}. The initial velocity of particle (at time t = 0) is u = 0.

## Question number: 139 (1 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

### Question

The distance travelled (in meters) by the particle from time t = 0 to t = t will be –

### Choices

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

a. | - + | |

b. | ||

c. | - | |

d. | All of the above |

## Question number: 140 (2 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

### Question

the distance travelled (in meters) by the particle from time to t = 0 to t = 1 is will be-

### Choices

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

a. | 4/π | |

b. | 1/π | |

c. | 2/π | |

d. | None of the above |

## Question number: 141 (3 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

### Question

The magnitude of displacement (in meters) by the particle from time t = 0 to t = t will be –

### Choices

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

a. | - | |

b. | - + | |

c. | ||

d. | All of the above |

## Question number: 142

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A ball is fixed to the end of a string and is rotated in a horizontal circle of radius 10 m with a speed of 20 m/sec. The acceleration of the ball will be -

### Choices

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

a. | 20 m/s | |

b. | 30 m/s | |

c. | 40 m/s | |

d. | 10 m/s |