Projectile peak: velocity and acceleration are: MCQ with Answer and Explanation

Projectile peak: velocity and acceleration are:
A. v max, a=0
B. v=0, a=g downward
C. Both zero
D. Both max
Answer: Option B
Solution (By JKSSB Mock Tests)
At maximum height, vertical velocity = 0 momentarily, but acceleration = g downward throughout motion. Memory tip: 'Peak: v=0, a=g; gravity never switches off'. Kinematics concept frequently tested to correct misconception that acceleration vanishes at peak.

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Practice More Physics Questions

Question #1
The final image in an astronomical telescope is
A. Real and inverted
B. Virtual and inverted
C. Virtual and erect
D. Real and erect

Correct Answer: Option B


Explanation:
Telescope forms inverted, virtual image at infinity (or near point). For terrestrial, erecting lens makes erect.

This question belongs to: Science Physics
Question #2
Two electric bulbs rated 60W, 220V and 100W, 220V are connected strictly in series across a 220V supply. Which bulb will glow brighter?
A. Both will glow with equal brightness.
B. 100W bulb
C. 60W bulb
D. Neither will glow.

Correct Answer: Option C


Explanation:
Resistance of a bulb is R = V^2 / P. The 60W bulb has a higher resistance than the 100W bulb. When connected in series, the exact same current (I) flows through both. The power consumed (which determines brightness) is given by P = I^2R. Since the 60W bulb has higher resistance (R), it consumes more power and glows brighter.

This question belongs to: Science Physics
Question #3
An object is placed at the centre of curvature of a concave mirror. The image formed is
A. Virtual, erect, magnified
B. Real, inverted, diminished
C. Virtual, inverted, same size
D. Real, inverted, same size

Correct Answer: Option D


Explanation:
At C (centre of curvature), image is at C, real, inverted, same size. At F, image at infinity. Beyond C, between F and C, diminished. Object between F and C gives beyond C, enlarged.

This question belongs to: Science Physics