In non-uniform circular motion, the net acceleration of the particle is directed: MCQ with Answer and Explanation

In non-uniform circular motion, the net acceleration of the particle is directed:
A. Strictly towards the center
B. At an angle to both the radius and the tangent
C. Strictly along the tangent to the circle
D. Outwards, away from the center
Answer: Option B
Solution (By JKExamLibrary)
In non-uniform circular motion, the speed of the particle changes. This requires a tangential acceleration (at) to change the speed, and a centripetal/radial acceleration (ac) to change the direction. The net acceleration is the vector sum of these two mutually perpendicular components, so it points inward at an angle to the radius.

This question belongs to: Science Physics

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Question #1 Report Error
Which of the following is a non-contact force?
A. Normal force
B. Muscular force
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Correct Answer: Option C


Explanation:
Electrostatic force acts between charges at a distance without contact. Gravity, magnetic force also non-contact. Friction and normal require contact.

This question belongs to: Science Physics
Question #2 Report Error
Which of the following devices relies on the heating effect of electric current?
A. Electric fan
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Correct Answer: Option D


Explanation:
An electric iron contains a heating element (usually nichrome). When electric current passes through this high-resistance element, it produces heat according to Joule's law (H = I²Rt). An electric fan uses the magnetic effect (motor), a generator uses electromagnetic induction, and a transformer uses mutual induction.

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Question #3 Report Error
The speed of sound in air at 0°C is 331 m/s. At 22°C, approximately
A. 360 m/s
B. 343 m/s
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Correct Answer: Option B


Explanation:
v ≈ 331 + 0.6×T(°C) = 331 + 0.6×22 = 331+13.2 = 344.2 m/s, nearest 343 m/s.

This question belongs to: Science Physics