Elastic and Inelastic Collisions in One and Two Dimensions NEET Questions

Physics - Work, Energy, and Power
Elastic and Inelastic Collisions in One and Two Dimensions

Elastic and Inelastic Collisions in One and Two Dimensions MCQ Questions


13.
In a 1D elastic collision between equal masses (m1 = m2 = m), m1 moves with v and m2 is at rest. After collision:
A.
Both move with v/2
B.
Both reverse direction
C.
m1 reverses; m2 stays at rest
D.
m1 comes to rest; m2 moves with v
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ANSWER :
D. m1 comes to rest; m2 moves with v
14.
In a 1D elastic collision, if m2 >> m1 (m2 is very heavy, at rest), what happens to m1?
A.
m1 stops; m2 moves forward
B.
m1 moves forward faster
C.
Both move forward with the same speed
D.
m1 reverses with approximately same speed; m2 is undisturbed
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ANSWER :
D. m1 reverses with approximately same speed; m2 is undisturbed
15.
In a 1D elastic collision, if m1 >> m2 (m1 is very heavy, m2 at rest), what approximately happens?
A.
m1 stops; m2 moves with 2v1i
B.
m1 reverses; m2 stays
C.
Both stop
D.
m1 continues with ≈ v1i; m2 moves with ≈ 2v1i
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ANSWER :
D. m1 continues with ≈ v1i; m2 moves with ≈ 2v1i
16.
The key relationship between initial and final velocities in a 1D elastic collision (from NCERT Eq. 5.25) is:
A.
v2f = v1i − v1f
B.
v1f + v2f = v1i
C.
v2f = 2v1i
D.
v2f = v1i + v1f
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ANSWER :
D. v2f = v1i + v1f
17.
For a 1D elastic collision, the relative velocity of separation equals the relative velocity of approach. This means:
A.
v1f − v2f = v1i − v2i
B.
v2f − v1f = v1i − v2i
C.
v1f + v2f = v1i + v2i
D.
v1f − v2f = 0
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ANSWER :
B. v2f − v1f = v1i − v2i
18.
In a 1D elastic collision, a body of mass 3 kg moving at 4 m/s hits a stationary body of mass 1 kg. Final velocity of the 1 kg body is:
A.
3 m/s
B.
4 m/s
C.
6 m/s
D.
8 m/s
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ANSWER :
C. 6 m/s
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