Head on elastic collision-Basic

Dear Readers,

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. In the elastic collision of objects

•  Only momentum remains constant
•  Only kinetic energy remains constant
•   Both remains constant
•  None of these

Both remains constant

Q2.  A body of mass 2kg makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is

•  2 kg
•   1.2 kg
•  3 kg
•  1.5 kg

1.2 kg

Q3. In an elastic collision of two particles the following is conserved

•  Momentum of each particle
•  Speed of each particle
•  Kinetic energy of each particle
•   Total kinetic energy of both the particles

Total kinetic energy of both the particles

Q4.  A particle of mass m moving with a velocity V makes a head on elastic collision with another particle of same mass initially at rest. The velocity of the first particle after the collision will be

•  V
•  -V
•  -2V
•  Zero

Zero

Q5. A body with velocity 50m/s collides with another body at rest. After collision this body moves with a velocity of 30 m/s. The velocity of second body after collision in m/s is :

•  30
•  20
•  50
•  80

80

Q6. Two identical spheres move in opposite directions with speeds and and pass behind an opaque screen, where they may either cross without touching (Event 1) or make an elastic head - on collision (Event 2)

•  We can never make out which event has occurred
•  We cannot make out which event has occurred only if v1=v2
•  We can always make out which event has occurred
•  We can make out which event has occurred only if v1=v2

We can never make out which event has occurred

Q7. A body of mass m moving with velocity V makes a head - on collision with another body of mass 2m which is initially at rest. The ratio of kinetic energies of colliding body before and after collision will be

•  9:1
•  1:1
•  4:1
•  2:1

9:1

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Head on elastic collision-Basic
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