physics : class11 Projectile from a Height : Projectile Motion : Kinematics MCQ Questions and Answers
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Projectile from a Height
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MCQ Questions
1. A ball is projected horizontally from the top of a 20 m high cliff. Taking g = 10 m/s², how long does it take to reach the ground?
A.
1 s
B.
2 s
C.
3 s
D.
4 s
Correct Answer:
2 s
Explanation:
For horizontal projection, the initial vertical velocity is zero. Using h = 1/2 gt², 20 = 1/2 × 10 × t², so t = 2 s.
2. A stone is projected horizontally with a speed of 5 m/s from a height of 20 m. If g = 10 m/s², what horizontal distance does it cover before hitting the ground?
A.
5 m
B.
10 m
C.
15 m
D.
20 m
Correct Answer:
10 m
Explanation:
The time of fall is 2 s. The horizontal distance is x = uₓt = 5 × 2 = 10 m.
3. A projectile is thrown horizontally from a height. What is its initial vertical velocity?
A.
Equal to its horizontal velocity
B.
Zero
C.
Equal to g
D.
Maximum at the point of projection
Correct Answer:
Zero
Explanation:
For a horizontal projection from a height, the projectile initially has velocity only in the horizontal direction, so its initial vertical velocity is zero.
4. A ball is projected horizontally from a height of 45 m. Taking g = 10 m/s², what is its vertical velocity just before reaching the ground?
A.
15 m/s downward
B.
30 m/s downward
C.
45 m/s downward
D.
60 m/s downward
Correct Answer:
30 m/s downward
Explanation:
The time of fall is found from 45 = 1/2 × 10 × t², giving t = 3 s. Thus, vertical velocity vᵧ = gt = 10 × 3 = 30 m/s downward.
5. A projectile is launched horizontally from a height. Which component of its velocity remains constant during its motion, neglecting air resistance?
A.
Vertical component
B.
Horizontal component
C.
Resultant velocity
D.
Both components increase equally
Correct Answer:
Horizontal component
Explanation:
Gravity acts vertically downward, so it does not change the horizontal velocity. Therefore, the horizontal component remains constant.
6. Two stones are released from the same height at the same instant. One is dropped vertically and the other is projected horizontally. Neglecting air resistance, which reaches the ground first?
A.
The dropped stone
B.
The horizontally projected stone
C.
Both reach the ground at the same time
D.
The result depends only on their masses
Correct Answer:
Both reach the ground at the same time
Explanation:
Both stones have the same initial vertical velocity, zero, and undergo the same downward acceleration due to gravity. Their horizontal motion does not affect the time of fall.
7. A ball is projected horizontally from a 5 m high platform with a speed of 4 m/s. Taking g = 10 m/s², how far from the base of the platform does it land?
A.
2 m
B.
4 m
C.
6 m
D.
8 m
Correct Answer:
4 m
Explanation:
The time of fall is given by 5 = 1/2 × 10 × t², so t = 1 s. The horizontal range is x = 4 × 1 = 4 m.
8. For a projectile projected horizontally from a height, what is the shape of its path?
A.
Straight horizontal line
B.
Straight vertical line
C.
Parabola
D.
Circle
Correct Answer:
Parabola
Explanation:
The projectile moves uniformly horizontally and accelerates vertically downward. Combining these two motions gives a parabolic path.
9. A projectile is projected horizontally from a height of 80 m with a horizontal speed of 10 m/s. Taking g = 10 m/s², what is its horizontal range?
A.
20 m
B.
30 m
C.
40 m
D.
80 m
Correct Answer:
40 m
Explanation:
The time of fall is found from 80 = 1/2 × 10 × t², giving t = 4 s. Therefore, the horizontal range is 10 × 4 = 40 m.
10. A projectile is projected horizontally from a height. At the instant it leaves the point of projection, which acceleration does it have?
A.
Zero acceleration
B.
Horizontal acceleration equal to g
C.
Vertical downward acceleration equal to g
D.
Vertical upward acceleration equal to g
Correct Answer:
Vertical downward acceleration equal to g
Explanation:
After projection, the only acceleration is due to gravity. It acts vertically downward with magnitude g.
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