The gravitational force between two objects of masses 2 kg and 3 kg separated by 2 m (G = 6.67×10⁻¹¹) is MCQ with Answer and Explanation
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Question #1
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The working of an electric motor is based on
Correct Answer: Option B
Explanation:
Motor converts electrical to mechanical energy using force on a current-carrying conductor in magnetic field (F = BIL). Electromagnetic induction is for generator. Motor principle: A current-carrying coil experiences torque in magnetic field.
Motor converts electrical to mechanical energy using force on a current-carrying conductor in magnetic field (F = BIL). Electromagnetic induction is for generator. Motor principle: A current-carrying coil experiences torque in magnetic field.
Question #2
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The part of human eye that controls amount of light entering is
Question #3
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In non-uniform circular motion, the net acceleration of the particle is directed:
Correct Answer: Option B
Explanation:
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.
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.
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