NEET Physics Work, Energy, and Power MCQs

🎯Topic:Law Of Conservation Of Energy

🔄Ncert Concepts :Conservation of Energy, Conservation of Momentum, Elastic Collision

A particle of mass $m$ moving with velocity $v$ collides elastically with another particle of mass $2m$ at rest. If the lighter particle is deflected through an angle of $90^\circ$ , the fractional loss in its kinetic energy is:

1/3

1/2

2/3

3/4

Question Tags

🎯Topic:Kinetic Energy

🔄Ncert Concepts :Kinetic Energy, Momentum, Collision, Elastic Collision

Two identical smooth spheres collide obliquely. Sphere A initially moves with speed $v$ at an angle $heta$ to the line of centers, while sphere B is initially at rest. If the coefficient of restitution is $e$ , what is the speed of sphere B after the collision?

$v(1+e) \cos(heta)$

$\frac{v(1+e)}{2} \sin(heta)$

$\frac{v(1-e)}{2} \cos(heta)$

$\frac{v(1+e)}{2} \cos(heta)$

Question Tags

🔄Ncert Concepts :Elastic Collisions, Coefficient of Restitution, Momentum Conservation

A particle of mass $m$ collides elastically with a smooth wedge of mass $M$ and angle $\alpha$ , which is free to move on a smooth horizontal surface. The particle is projected towards the wedge with velocity $v$ along the horizontal direction. What is the impulse imparted to the wedge during the collision?

$\frac{2mv \cos^2(\alpha)}{1 + (m/M) \sin^2(\alpha)}$

$\frac{mv \sin^2(\alpha)}{1 + (m/M) \cos^2(\alpha)}$

$\frac{2mv \sin^2(\alpha)}{1 + (m/M) \sin^2(\alpha)}$

$\frac{2mv \sin(2\alpha)}{1 + (m/M) \sin^2(\alpha)}$

Question Tags

⚡ Time Required :4 mins

🔄Ncert Concepts :Elastic Collisions, Impulse, Momentum Conservation

In an elastic oblique collision between two identical particles, with one particle initially at rest, the angle between the velocities of the particles after the collision is $heta$ . Which of the following is true about $heta$ ?

$heta = \pi/2$ always

$heta$ can vary between 0 and $\pi$

$heta = \pi$ always

$heta$ can vary between 0 and $\pi/2$

Question Tags

🎓 Ncert Level:Analyzing

🔄Ncert Concepts :Elastic Collisions, Center of Mass Frame

Two particles of masses $m$ and $2m$ undergo an elastic collision in one dimension. If the lighter particle is initially at rest and the heavier particle has initial velocity $v$ , what is the velocity of the heavier particle after the collision?

$2v/3$

$v/3$

$-v/3$

$-2v/3$

Question Tags

⚡ Time Required :2 mins

🔄Ncert Concepts :Elastic Collisions, Momentum Conservation, Kinetic Energy Conservation

A ball of mass $m$ collides elastically with a wall with velocity $v$ at an angle $heta$ to the normal. The coefficient of restitution between the ball and the wall is $e$ . What is the impulse imparted by the wall on the ball?

$mv(1+e)\sin(heta)$

$2mv\cos(heta)$

$mv(1+e)\cos(heta)$

$mv(1-e)\cos(heta)$

Question Tags

🔄Ncert Concepts :Elastic Collisions, Impulse, Coefficient of Restitution

Three identical spheres A, B, and C are placed on a smooth horizontal table such that their centers form an equilateral triangle. Sphere A is given a velocity $v$ towards B. After colliding elastically with B, A comes to rest. What is the speed of C after all collisions have ceased?

v/4

v/2

Question Tags

🎓 Ncert Level:Analyzing

⚡ Time Required :4 mins

🔄Ncert Concepts :Elastic Collisions, Momentum Conservation, Kinetic Energy Conservation

Two identical balls of mass 'm' are moving with velocities 'v' and '2v' along the same line and undergo a perfectly inelastic collision. The fraction of the initial kinetic energy transformed into heat is:

1/10

1/5

1/2

9/10

Question Tags

🎯Topic:Inelastic Collision