NEET Physics MCQs

📑 Chapter:Motion In A Straight Line

🎯Topic:Avg Speed And Avg Velocity

🎯Difficulty :Medium

⚡ Time Required :1 mins

🔄Ncert Concepts :Average Velocity, Displacement, Circular Motion

12.

A small ball attached to a massless string is undergoing vertical circular motion. At the highest point of its trajectory, the tension in the string is zero. Which of the following statements is TRUE about the ball's mechanical energy as it moves from the highest point to the lowest point in the circle?

The kinetic energy increases, and the potential energy decreases, such that the total mechanical energy remains constant.

The kinetic energy decreases, and the potential energy increases, such that the total mechanical energy remains constant.

Both the kinetic energy and potential energy decrease, but the total mechanical energy remains constant.

Both the kinetic energy and potential energy increase, but the total mechanical energy remains constant.

Question Tags

🎯Topic:Law Of Conservation Of Energy

🎓 Ncert Level:Analyzing

⚡ Time Required :2.5 mins

🔄Ncert Concepts :Conservation of Energy, Vertical Circular Motion, Kinetic Energy, Potential Energy

13.

A body of mass $m$ is moving in a circular path of radius $r$ with a constant speed $v$ . The work done by the centripetal force in half a revolution is:

$\pi mv^2$

$2\pi mv^2$

$\frac{mv^2}{r}$

Question Tags

🎓 Ncert Level:Understanding

🎯Topic:Kinetic Energy

⚡ Time Required :1 mins

🔄Ncert Concepts :Kinetic Energy, Work, Centripetal Force, Circular Motion

14.

A particle moves in a vertical circle attached to a string of length 'l'. At the lowest point, its speed is 'u'. What is the minimum value of 'u' required for the string to remain taut at the highest point?

$\sqrt{gl}$

$\sqrt{2gl}$

$\sqrt{3gl}$

$\sqrt{5gl}$

Question Tags

⚡ Time Required :3 mins

🔄Ncert Concepts :Uniform Circular Motion, Conservation of Energy, Centripetal Force

15.

A car is moving with constant speed on a banked curved road, inclined at an angle $heta$ . If the coefficient of static friction between the tires and the road is $\mu_s$ , what are the maximum and minimum speeds the car can have without skidding?

$v_{max} = \sqrt{\frac{rg(tanheta + \mu_s)}{1 - \mu_s tanheta}}$ , $v_{min} = \sqrt{\frac{rg(tanheta - \mu_s)}{1 + \mu_s tanheta}}$

$v_{max} = \sqrt{\frac{rg(sinheta + \mu_s)}{1 - \mu_s sinheta}}$ , $v_{min} = \sqrt{\frac{rg(sinheta - \mu_s)}{1 + \mu_s sinheta}}$

$v_{max} = \sqrt{rg(tanheta + \mu_s)}$ , $v_{min} = \sqrt{rg(tanheta - \mu_s)}$

$v_{max} = \sqrt{\frac{rg(1 + \mu_s tanheta)}{tanheta - \mu_s}}$ , $v_{min} = \sqrt{\frac{rg(1 - \mu_s tanheta)}{tanheta + \mu_s}}$

Question Tags

⚡ Time Required :4 mins

🔄Ncert Concepts :Uniform Circular Motion, Friction, Banking of Roads

16.

A particle of mass 'm' is attached to a string and whirled in a vertical circle of radius 'r'. If the tension in the string at the highest point is zero, what is the tension at the lowest point?

2mg

3mg

6mg

Question Tags

⚡ Time Required :3 mins

🔄Ncert Concepts :Uniform Circular Motion, Conservation of Energy, Centripetal Force

17.

Two identical particles are attached to a light inextensible string passing through a smooth hole on a horizontal table. One particle moves on the table in a circle of radius 'r' and the other hangs vertically. If the angular velocity of the particle on the table is $\omega$ , find the length of the hanging portion of the string.

$\frac{g}{\omega}$

$\frac{g}{\omega^2}$

$g\omega$

$g\omega^2$

Question Tags

⚡ Time Required :3 mins

🔄Ncert Concepts :Uniform Circular Motion, Centripetal Force, Equilibrium

18.

A small ball is attached to a string and whirled in a vertical circle. At a certain point on the circular path, the tension in the string is six times the weight of the ball. What is the speed of the ball at this point if the radius of the circle is 'r'?

$\sqrt{gr}$

$\sqrt{2gr}$

$\sqrt{3gr}$

$\sqrt{5gr}$

Question Tags

⚡ Time Required :2 mins

🔄Ncert Concepts :Uniform Circular Motion, Centripetal Force

19.

A body is moving with a constant speed in a circular path. Which of the following statements is true about its kinetic energy?

It increases continuously.

It decreases continuously.

It remains constant.

It oscillates between a maximum and minimum value.

Question Tags