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Green International University12 الأسئلة
Physics MCQs
Practice Physics multiple-choice questions for Green International University competitive exams. Each question includes the correct answer and a short explanation, and past-paper questions are marked so you can revise both repeated and fresh material in one place.
Decreases collagen production
Promotes oxygenation and has an antiseptic effect
Increases the depth of product penetration through iontophoresis
Cooling the skin surface
الشرحHigh-frequency currents produce ozone, which is highly oxygenating and provides an antiseptic benefit, often used to treat acne.
Increased atmospheric pressure
Heat-induced vasodilation and increased perspiration
Magnetic attraction of pollutants
Refractive index changes
الشرحSteam warms the skin, causing blood vessels to dilate (vasodilation) and increasing sweat production, which helps soften debris in the pores.
Ohm's Law
Newton's First Law
The Law of Thermodynamics
Boyle's Law
الشرحOhm's Law (V=IR) governs the relationship between voltage, current, and resistance in electrical circuits, including those involving the skin.
Through light reflection off a concave mirror
Through light refraction through a convex lens
Through light polarization
Through light diffraction
الشرحA convex lens converges light rays to form a magnified image of the object being examined.
Mechanical vibration
Conversion of light energy into heat in a target chromophore
Emission of ionizing radiation
Magnetic field alignment
الشرحSelective photothermolysis targets specific chromophores (like melanin or hemoglobin) using light to destroy them via controlled heat.
Refraction
Absorption
Reflection
Transmission
الشرحReflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
Faradic current
Galvanic current
Alternating current
High-frequency current
الشرحIontophoresis utilizes the constant direct current of a galvanic machine to push active ingredients into the skin.
When the voltage is too low for the device
When more current flows than the circuit is designed to handle
When the device is turned off
When the resistance is too high
الشرحAn overload occurs when too many appliances are connected to one circuit, exceeding the amperage capacity.
Infrared
Ultraviolet
Radio waves
Visible red light
الشرحUV light, specifically UVC, has germicidal properties that can kill or inactivate microorganisms.
The speed at which the current travels
The intensity of the current
The number of oscillations per second
The amount of heat generated
الشرحFrequency is measured in Hertz (Hz) and describes how many times an alternating current completes a full cycle per second.
To increase the conductivity of the machine
To prevent electrical shock by providing a path for stray current
To store excess charge
To change AC into DC
الشرحGrounding provides a safe path for electricity to flow into the earth if a short circuit occurs, protecting the user.
Allows electricity to flow freely
Prevents the flow of electricity
Increases the voltage of a current
Creates a spark
الشرحInsulators (like rubber or plastic) have high electrical resistance, which blocks the flow of electric current.
Frequently Asked Questions
Are these Physics MCQs free?
Yes. Every Physics MCQ on this page is free to practice, including the correct answer and explanation.
Do these include past-paper questions?
Yes — questions sourced from past papers are clearly marked with a "Past Paper" badge, alongside fresh practice questions.
Which exams do these Physics MCQs help with?
They are aimed at Green International University and related Pakistani competitive exams that test Physics.
How should I practice subject-wise MCQs?
Attempt each question first, then reveal the answer and read the explanation. Short, focused sessions on one subject work better than long unstructured reading.