physics : class11 Acceleration of Projectile : Projectile Motion : Kinematics MCQ Questions and Answers
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Acceleration of Projectile
MCQ questions and answers.
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MCQ Questions
1. What is the acceleration of a projectile moving near the Earth's surface when air resistance is neglected?
A.
Zero
B.
Acceleration due to gravity
C.
Horizontal acceleration only
D.
Acceleration equal to its velocity
Correct Answer:
Acceleration due to gravity
Explanation:
A projectile is continuously accelerated downward by Earth's gravity. Its acceleration is g, approximately 9.8 m/s².
2. In the absence of air resistance, what is the horizontal component of a projectile's acceleration?
A.
9.8 m/s²
B.
Zero
C.
Equal to the projectile's speed
D.
Increasing with time
Correct Answer:
Zero
Explanation:
Gravity acts vertically downward, so it produces no horizontal acceleration. Therefore, the horizontal component of acceleration is zero.
3. In which direction does the acceleration of a projectile act when air resistance is neglected?
A.
Horizontally forward
B.
Vertically upward
C.
Vertically downward
D.
Along the direction of motion
Correct Answer:
Vertically downward
Explanation:
The only acceleration acting on an ideal projectile is due to gravity, which is directed vertically downward.
4. What is the vertical component of acceleration of a projectile if upward is taken as the positive direction?
A.
+g
B.
0
C.
-g
D.
+2g
Correct Answer:
-g
Explanation:
Since gravity acts downward and upward is chosen as positive, the vertical acceleration is written as -g.
5. At the highest point of its path, what is the acceleration of a projectile?
A.
Zero
B.
g downward
C.
g upward
D.
Greater than g upward
Correct Answer:
g downward
Explanation:
Although the vertical velocity is zero at the highest point, gravity continues to act. Thus, the acceleration remains g downward.
6. A projectile is thrown horizontally from a height. What is its acceleration during its motion, neglecting air resistance?
A.
Zero
B.
Horizontally forward
C.
Vertically downward with magnitude g
D.
Vertically upward with magnitude g
Correct Answer:
Vertically downward with magnitude g
Explanation:
For a horizontally projected object, gravity provides a constant downward acceleration of magnitude g.
7. If the acceleration due to gravity is taken as 10 m/s², what is the acceleration of a projectile in flight?
A.
0 m/s²
B.
5 m/s² upward
C.
10 m/s² downward
D.
20 m/s² forward
Correct Answer:
10 m/s² downward
Explanation:
The acceleration of a projectile is the acceleration due to gravity, which is 10 m/s² downward under the given assumption.
8. Which statement about the acceleration of an ideal projectile is correct?
A.
It changes direction throughout the motion
B.
It is constant and vertically downward
C.
It is always horizontal
D.
It becomes zero at the highest point
Correct Answer:
It is constant and vertically downward
Explanation:
When air resistance is neglected, the projectile has a constant acceleration due to gravity directed vertically downward at every point of its path.
9. What is the magnitude of the acceleration of a projectile near Earth's surface, neglecting air resistance?
A.
0 m/s²
B.
4.9 m/s²
C.
9.8 m/s²
D.
19.6 m/s²
Correct Answer:
9.8 m/s²
Explanation:
The magnitude of gravitational acceleration near Earth's surface is approximately 9.8 m/s².
10. A projectile is moving upward after being launched. What is the direction of its acceleration while it moves upward?
A.
Upward
B.
Downward
C.
Along its velocity
D.
There is no acceleration
Correct Answer:
Downward
Explanation:
The direction of gravitational acceleration does not depend on whether the projectile is moving upward or downward. It always acts downward.
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