12th Physics Subject

What is the branch of physics that deals with the study of motion and its causes?

• Quantum Mechanics

• Classical Mechanics

• Astrophysics

• Thermodynamics

In the context of physics, what is the SI unit of force?

• Second (s)

• Kilogram (kg)

• Meter (m)

• Newton (N)

What is the formula to calculate work done?

• Work = Force x Distance x cos(theta)

• Work = Force + Distance

• Work = Force x Distance x sin(theta)

• Work = Force / Distance

Define electric current.

• Electric current is the flow of air through a conductor.

• Electric current is the flow of heat through a conductor.

• Electric current is the flow of electric charge through a conductor.

• Electric current is the flow of water through a conductor.

What is Ohm's Law?

• Ohm's Law is F = m * a, where F is force, m is mass, and a is acceleration.

• Ohm's Law is V = I * R, where V is the voltage, I is the current, and R is the resistance.

• Ohm's Law is E = mc^2, where E is energy, m is mass, and c is the speed of light.

• Ohm's Law is P = V * I, where P is power, V is voltage, and I is current.

Explain the concept of resistance in an electrical circuit.

• Resistance is the same as capacitance in an electrical circuit.

• Resistance is not affected by factors like material, length, or temperature.

• Resistance in an electrical circuit is measured in volts.

• Resistance in an electrical circuit is the opposition to the flow of current. It is measured in ohms and is caused by factors like the material of the conductor, its length, cross-sectional area, and temperature.

What is the function of a concave lens?

• To absorb light rays and create a sharper image.

• To converge light rays and correct farsightedness.

• To refract light rays and correct color blindness.

• To diverge light rays and correct nearsightedness.

Define refraction of light.

• Refraction of light is the change in direction of light as it passes from one medium to another medium with a different optical density.

• Refraction of light is the emission of light from a source

• Refraction of light is the reflection of light off a surface

• Refraction of light is the absorption of light by a medium

What is the law of reflection?

• Angle of reflection = Angle of refraction

• Angle of reflection = 180 degrees

• Angle of incidence = Angle of reflection

• Angle of incidence = 90 degrees

Explain the first law of thermodynamics.

• Energy cannot be created or destroyed, only transferred or converted.

• Energy can only be converted into matter, not transferred.

• Energy is not conserved in any form.

• Energy can be created or destroyed, not just transferred or converted.