Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.
0.3Ω
3.3Ω
3.6Ω
4.8Ω
Correct answer is C
Power delivered to head lamp = V2R
= 40W
R = V240
= (12×2)40
= 3.6Ω
The energy needed to move a unit positive charge around a complete electric circuit is called the
electromotive force
electric potential difference
electric energy
kinetic energy
Correct answer is B
Electric potential difference: work needed per unit of charge to move a test charge between the two points.
Electric energy: energy derived from electric potential energy.
Kinetic energy: moving energy
The tendency of a body to remain at rest when a force is applied to it is called.
Impulse
Momentum
Inertia
Friction
Correct answer is C
Inertia, property of a body by virtue of which it opposes any agency that attempts to put it in motion or, if it is moving, to change the magnitude or direction of its velocity. Inertia is a passive property and does not enable a body to do anything except oppose such active agents as forces and torques. A moving body keeps moving not because of its inertia but only because of the absence of a force to slow it down, change its course, or speed it up.
There are two numerical measures of the inertia of a body: its mass, which governs its resistance to the action of a force, and its moment of inertia about a specified axis, which measures its resistance to the action of a torque about the same axis.
