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A car is moving along a straight line, say OP in the figure. It moves from O to P in 18 s and returns from P to Q in 6.0 s. The average velocity and average speed of the car in going from O to P and back to Q respectively are:

1. 10 m/s & 10 m/s

2. 20 m/s & 30 m/s

3. 20 m/s & 20 m/s

4. 10 m/s & 20 m/s

Subtopic: Average Speed & Average Velocity |

70%

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The position of an object moving along \(\mathrm{x}\)-axis is given by \(x=a+bt^2\), where \(a=8.5\) m, \(b=2.5\) ${\mathrm{ms}}^{-2}$ and \(t\) is measured in seconds. Its average velocity between \(t=2.0\) s and \(t=4.0\) s is:

1. \(10\) m/s

2. \(15\) m/s

3. \(20\) m/s

4. \(25\) m/s

Subtopic: Average Speed & Average Velocity |

63%

From NCERT

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Which of the following does not represent the equation of motion for constant acceleration?

1. \(v=v_0+at\)

2. \(v^2=v_0^2+2a(x-x_0)\)

3. \(x = x_0v_0+\frac{1}{2}at^2\)

4. \(x = x_0+v_0t+\frac{1}{2}at^2\)

Subtopic: Uniformly Accelerated Motion |

69%

From NCERT

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A ball is thrown vertically upwards with a velocity of \(20\) m/s from the top of a multistorey building. The height of the point from where the ball is thrown is \(25.0\) m from the ground. How high will the ball rise from the point of throw? (Take \(g=10\) m/s^{2})

1. | 30 m | 2. | 25 m |

3. | 45 m | 4. | 20 m |

Subtopic: Uniformly Accelerated Motion |

70%

From NCERT

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A ball is thrown vertically upwards with a velocity of \(20\) m/s from the top of a multistorey building. The height of the point from where the ball is thrown is \(25.0\) m from the ground. How long will it be before the ball hits the ground? (Take \(g=10\) ms^{-2}.)

1. \(3\) s

2. \(2\) s

3. \(5\) s

4. \(20\) s

Subtopic: Uniformly Accelerated Motion |

67%

From NCERT

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When brakes are applied to a moving vehicle, the distance it travels before stopping is called stopping distance. It is an important factor for road safety and depends on the initial velocity \(\mathrm{v_0}\) and the braking capacity, or deceleration, \(-a\) that is caused by the braking. Expression for stopping distance of a vehicle in terms of \(\mathrm{v_0}\) and \(a\) is:

1. \(\frac{\mathrm{v_o}^2}{2a}\)

2. \(\frac{\mathrm{v_o}}{2a}\)

3. \(\frac{\mathrm{v_o}^2}{a}\)

4. \(\frac{2a}{\mathrm{v_o}^2}\)

Subtopic: Acceleration |

82%

From NCERT

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You can measure your reaction time by a simple experiment. Take a ruler and ask your friend to drop it vertically through the gap between your thumb and forefinger (figure shown below). After you catch it if the distance d travelled by the ruler is \(21.0\) cm, your reaction time is:

1. \(0.2\) s

2. \(0.4\) s

3. \(0\)

4. \(0.1\) s

Subtopic: Uniformly Accelerated Motion |

62%

From NCERT

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Galileo’s law of odd numbers: “The distances traversed, during equal intervals of time, by a body falling from rest, stand to one another in the ratio:

1. as the odd numbers beginning with unity.

2. as the even numbers beginning with unity.

3. as the square of odd numbers beginning with unity.

4. as the square of even numbers beginning with unity.

Subtopic: Uniformly Accelerated Motion |

81%

From NCERT

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A train is moving in south with a speed of 90 ${\mathrm{kmh}}^{-1}$. The velocity of ground with respect to the train is:

1. 0 ${\mathrm{ms}}^{-1}$

2. -25 ${\mathrm{ms}}^{-1}$

3. 25 ${\mathrm{ms}}^{-1}$

4. -40 ${\mathrm{ms}}^{-1}$

Subtopic: Relative Motion in One Dimension |

From NCERT

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Two parallel rail tracks run north-south. Train A moves north with a speed of 54 ${\mathrm{kmh}}^{-1}$, and train B moves south with a speed of 90 ${\mathrm{kmh}}^{-1}$. The magnitude of the velocity of B with respect to A is:

1. 40 ${\mathrm{ms}}^{-1}$

2. 0 ${\mathrm{ms}}^{-1}$

3. 25 ${\mathrm{ms}}^{-1}$

4. 15 ${\mathrm{ms}}^{-1}$

Subtopic: Relative Motion in One Dimension |

80%

From NCERT

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