Relative Velocity NEET Questions

Physics - Kinematics

Relative Velocity MCQ Questions


13.
A river 100 m wide flows at 3 m/s. A boat crosses at 4 m/s perpendicular to bank. The drift (downstream displacement) when the boat reaches the other bank is:
A.
75 m
B.
100 m
C.
60 m
D.
50 m
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ANSWER :
A. 75 m
14.
A boat heads north at 4 m/s while the river current is 3 m/s east. The magnitude of actual velocity of the boat is:
A.
7 m/s
B.
1 m/s
C.
5 m/s
D.
4 m/s
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ANSWER :
C. 5 m/s
15.
Rain falls vertically at 35 m/s. A man runs at 12 m/s horizontally. To protect himself, he should hold umbrella at angle ฮธ with vertical (toward front) where tanฮธ =
A.
35/12
B.
12/35
C.
35/7
D.
7/12
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ANSWER :
B. 12/35
16.
In Q15 (rain at 35 m/s vertically, man running at 12 m/s), the speed of rain relative to the man is:
A.
23 m/s
B.
47 m/s
C.
37 m/s
D.
35 m/s
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ANSWER :
C. 37 m/s
17.
A man walking east at 4 m/s finds rain falling at 45ยฐ to vertical (toward the west). When he doubles his speed, rain appears to fall:
A.
Vertically
B.
At 45ยฐ toward east
C.
Horizontally
D.
At 30ยฐ to vertical
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ANSWER :
A. Vertically
18.
Rain falls vertically to a stationary observer. To a cyclist moving east, rain appears to come from the east. This means rain is actually:
A.
Moving east
B.
Moving west
C.
Falling vertically
D.
Moving at 45ยฐ east
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ANSWER :
C. Falling vertically