A bob is whirled in a horizontal plane by means of a string with an initial speed of \(\omega\) rpm. The tension in the string is \(T\). If speed becomes \(2\omega\) while keeping the same radius, the tension in the string becomes:

1. | \(4 T\) | 2. | \(\dfrac{T}{4}\) |

3. | \(\sqrt{2} T\) | 4. | \(T\) |

Subtopic: Â Uniform Circular Motion |

Â 65%

From NCERT

NEET - 2024

Please attempt this question first.

Hints

Please attempt this question first.

A bob is whirled in a horizontal circle by means of a string at an initial speed of \(10\) rpm. If the tension in the string is quadrupled while keeping the radius constant, the new speed is:

1. | \(20\) rpm | 2. | \(40\) rpm |

3. | \(5\) rpm | 4. | \(10\) rpm |

Subtopic: Â Uniform Circular Motion |

Â 62%

From NCERT

NEET - 2024

Please attempt this question first.

Hints

Please attempt this question first.

A block of mass \(10~\text{kg}\) is in contact with the inner wall of a hollow cylindrical drum of radius \(1~\text{m}\). The coefficient of friction between the block and the inner wall of the cylinder is \(0.1\). The minimum angular velocity needed for the cylinder, which is vertical and rotating about its axis, will be: \(\left(g= 10~\text{m/s}^2\right )\)

1. \(10~\pi~\text{rad/s}\)

2. \(\sqrt{10}~\pi~\text{rad/s}\)

3. \(\frac{10}{2\pi}~\text{rad/s}\)

4. \(10~\text{rad/s}\)

Subtopic: Â Uniform Circular Motion |

Â 66%

From NCERT

NEET - 2019

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Two stones of masses \(m\) and \(2m\) are whirled in horizontal circles, the heavier one in a radius \(\frac{r}{2}\) and the lighter one in a radius \(r\). The tangential speed of lighter stone is \(n\) times that of the value of heavier stone when they experience the same centripetal forces. The value of \(n\) is:

1. | \(3\) | 2. | \(4\) |

3. | \(1\) | 4. | \(2\) |

Subtopic: Â Uniform Circular Motion |

From NCERT

NEET - 2015

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

A roller coaster is designed such that riders experience "weightlessness" as they go around the top of a hill whose radius of curvature is \(20\) m. The speed of the car at the top of the hill is between:

1. | \(14\) m/s and \(15\) m/s |

2. | \(15\) m/s and \(16\) m/s |

3. | \(16\) m/s and \(17\) m/s |

4. | \(13\) m/s and \(14\) m/s |

Subtopic: Â Uniform Circular Motion |

Â 71%

From NCERT

AIPMT - 2008

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

A tube of length \( L\) is filled completely with an incompressible liquid of mass \(M\) and closed at both ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity \(\omega\). The force exerted by the liquid at the other end is:

1. | \(ML \omega^2 \over 2\) | 2. | \(ML^2 \omega \over 2\) |

3. | \(ML \omega^2 \) | 4. | \(ML^2 \omega^2 \over 2\) |

Subtopic: Â Uniform Circular Motion |

Â 57%

From NCERT

AIPMT - 2006

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

A particle of mass m is tied to a string of length \(l\) and whirled into a horizontal plane. If the tension in the string is T, then the speed of the particle will be:

1. $\sqrt{\frac{Tl}{m}}$

2. $\sqrt{\frac{2Tl}{m}}$

3. $\sqrt{\frac{3Tl}{m}}$

4. $\sqrt{\frac{T}{ml}}$

Subtopic: Â Uniform Circular Motion |

Â 78%

From NCERT

AIPMT - 1998

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch