# Kinematics-Uniformly Accelerated Motion (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 5 of 23

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## Question number: 1

» Kinematics » Uniformly Accelerated Motion

### Question

The shaft of an electric motor starts from rest and on the application of a torque, it gains an angular acceleration given by a = 3t –t ^{3} during the first 2 seconds after it starts after which a = 0. The angular velocity after 6 sec will be –

### Choices

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

a. | 2 rad/sec | |

b. | 1 rad/sec | |

c. | 4 rad/sec | |

d. | 3 rad/sec |

## Question number: 2

» Kinematics » Uniformly Accelerated Motion

### Question

The shaft of an electric motor starts from rest and on the application of a torque, it gains an angular acceleration given by a = 3t –t ^{2} during the first 2 seconds after it starts after which a = 0. The angular velocity after 6 sec will be –

### Choices

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

a. | 30/4 rad/sec | |

b. | 4/30 rad/sec | |

c. | 3/10 rad/sec | |

d. | 10/3 rad/sec |

## Question number: 3

» Kinematics » Uniformly Accelerated Motion

### Question

Using rectangular co-ordinates and the unit vectors i and j, the vector expression for the acceleration a will be (r is a position vector) -

### Choices

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

a. |
| |

b. | - | |

c. | -2r | |

d. | r |

## Question number: 4

» Kinematics » Uniformly Accelerated Motion

### Question

The angular velocity of a particle is given by co = 1.51 - 3t ^{2} + 2, the time when its angular acceleration decreases to be zero will be -

### Choices

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

a. | 25 sec | |

b. | 1.2 sec | |

c. | 0.25 sec | |

d. | 12 sec |

## Question number: 5

» Kinematics » Uniformly Accelerated Motion

### Question

### Assertion (Ꭺ)

In non-uniform circular motion, velocity vector and acceleration vector are not perpendicular to each other.

### Reason (Ꭱ)

In non-uniform circular motion, particle has normal as well as tangential acceleration.

### Choices

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

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

b. | Ꭺ is true but Ꭱ is false | |

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

d. | Both Ꭺ and Ꭱ are false |