physics

The resistance of a 40W car headlamp; drawing current from a 12V battery is?

A. 0.3Ω B. 3.3Ω C. 3.6Ω D. 4.8Ω Correct Answer: Option C - 3.6Ω Explanation Power delivered to headlamp =…

5 years ago

A force of 5N acts at a point Y on a rod XYZ as shown in this diagram. If XYZ is 2m; what is the moment of the force about point X?

A. 0Nm B. 3Nm C. 7Nm D. 10Nm Correct Answer: Option D - 10Nm Explanation Moment = Force × Distance…

5 years ago

The energy needed to move a unit positive charge around a complete electric circuit is called the?

A. electromotive force B. electric potential difference C. electric energy D. kinetic energy Correct Answer: Option B - electric potential…

5 years ago

An object is placed 20cm from a concave mirror of focal length 10cm. The linear magnification of the image produced is?

A. 0 B. 12 C. 1 D. 2 Correct Answer: Option C = 1 Explanation I/V = 1/f – 1/u…

5 years ago

The tendency of a body to remain at rest when a force is applied to it is called?

A. Impulse B. Momentum C. Inertia D. Friction Correct Answer: Option C - Inertia Explanation Inertia, property of a body…

5 years ago

The force between the molecules of a liquid in contact with that of a solid is?

A. Adhesive B. Cohesive C. Magnetic D. Repulsive Correct Answer: Option A - Adhesive Explanation The term Adhesive forces refers…

5 years ago

A ball of mass 800g moving horizontally with a speed of 5m/s hits a vertical wall and rebounds with the same speed. The impulse experienced by the ball is?

A. 0kgm B. 2kgm/s C. 4kgm/s D. 8kgm/s Correct Answer: Option D - 8kgm/s Explanation Initial momentum = (0.8) ×…

5 years ago

When an atom loses or gain a charge it becomes?

A. An electron B. An ion C. A neutron D. A proton Correct Answer: Option B - An ion Explanation…

5 years ago