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Physics MCQs

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Medium pms Uploaded: 17 Aug 2026

Which mirror is used as a rear-view mirror in vehicles?

A Plane mirror
B Cylindrical mirror
C Convex mirror
D Concave mirror

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Correct Answer: Option C — Convex mirror

Explanation: A convex mirror is used as a rear-view mirror in vehicles because it produces a diminished, upright, virtual image and provides a wider field of view compared to a flat plane mirror.

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Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which effect describes the emission of electrons from a metal surface when light of sufficient frequency falls on it?

A Compton effect
B Zeeman effect
C Photoelectric effect
D Doppler effect

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Correct Answer: Option C — Photoelectric effect

Explanation: The photoelectric effect describes the emission of electrons from a metal surface when light above a threshold frequency strikes it and was explained by Einstein winning him the Nobel Prize.

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Hard css Uploaded: 06 Aug 2026

What is the term for the force that opposes relative motion between surfaces in contact?

A Gravity
B Tension
C Friction
D Normal force

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Correct Answer: Option C — Friction

Explanation: Friction is a resistive force that opposes relative motion between two surfaces in contact. It depends on the nature of the surfaces and the normal force pressing them together, and can be reduced using lubricants.

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Medium pms Uploaded: 17 Aug 2026

The transfer of heat through fluids due to the actual movement of the fluid particles is called:

A Conduction
B Radiation
C Insulation
D Convection

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Correct Answer: Option D — Convection

Explanation: Convection is the process of heat transfer that occurs due to the bulk movement of fluid particles, carrying thermal energy from warmer regions to cooler regions within liquids or gases.

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Easy fpsc Uploaded: 17 Aug 2026

Which of the following is a good conductor of electricity?

A Glass
B Wood
C Copper
D Plastic

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Correct Answer: Option C — Copper

Explanation: Copper is an excellent electrical conductor due to the presence of many free electrons in its metallic structure, which is why it is extensively used in electrical wiring and circuits.

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Medium fpsc Uploaded: 17 Aug 2026

What is the term for the tendency of a body to resist changes in its rotational motion?

A Angular velocity
B Moment of inertia
C Torque
D Angular momentum

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Correct Answer: Option B — Moment of inertia

Explanation: Moment of inertia is the rotational analogue of mass in linear motion; it measures how much a body resists angular acceleration and depends on both mass and its distribution relative to the axis.

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Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which device is used to measure the potential difference between two points in a circuit?

A Ammeter
B Voltmeter
C Galvanometer
D Ohmmeter

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Correct Answer: Option B — Voltmeter

Explanation: A voltmeter is connected in parallel across two points in a circuit to measure the potential difference or voltage between them and has a very high internal resistance.

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Easy css Uploaded: 06 Aug 2026

What is the SI unit of power?

A Newton
B Pascal
C Watt
D Joule

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Correct Answer: Option C — Watt

Explanation: The Watt (W) is the SI unit of power, named after James Watt. It measures the rate at which work is done or energy is transferred, with one watt equal to one joule of energy transferred per second.

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Medium pms Uploaded: 06 Aug 2026

What is the term for the electrical potential difference between two points in a circuit?

A Current
B Resistance
C Voltage
D Power

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Correct Answer: Option C — Voltage

Explanation: Voltage, also known as electric potential difference, represents the energy per unit charge required to move electric charge between two points in a circuit. It drives current flow through a conductor when a complete circuit exists.

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Hard ppsc Uploaded: 17 Aug 2026

Infrasonic waves have frequencies:

A Above 20,000 Hz
B Between 20 Hz and 20,000 Hz
C Below 20 Hz
D Above 200,000 Hz

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Correct Answer: Option C — Below 20 Hz

Explanation: Infrasonic waves are sound waves with frequencies below 20 Hz, lower than the threshold of human hearing, and they are often produced by natural events such as earthquakes and volcanic eruptions.

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Easy css Uploaded: 17 Aug 2026

A diode allows current to flow in:

A A direction determined by voltage frequency
B Neither direction
C Both directions equally
D Only one direction

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Correct Answer: Option D — Only one direction

Explanation: A diode is a semiconductor device designed to allow electric current to flow easily in only one direction while blocking flow in the reverse direction, making it useful for rectification.

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Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the formula for gravitational potential energy?

A half mv squared
B mgh
C Fxd
D mv

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Correct Answer: Option B — mgh

Explanation: Gravitational potential energy is calculated as mass multiplied by gravitational acceleration multiplied by height expressed as PE equals mgh where g is approximately 9.8 m/s squared.

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Medium css Uploaded: 17 Aug 2026

Weight of a body is the force of gravity acting on its:

A Volume
B Area
C Density
D Mass

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Correct Answer: Option D — Mass

Explanation: Weight is the gravitational force exerted on the mass of an object by a nearby celestial body such as Earth, calculated as mass multiplied by the local gravitational acceleration, and it varies with location.

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Easy nts Uploaded: 06 Aug 2026

What is the term for an object floating due to the upward force of a fluid?

A Gravity
B Buoyancy
C Tension
D Friction

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Correct Answer: Option B — Buoyancy

Explanation: Buoyancy is the upward force exerted by a fluid on a submerged or floating object, opposing its weight. According to Archimedes' Principle, this force equals the weight of the fluid displaced by the object, determining whether it floats or sinks.

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Hard ppsc Uploaded: 06 Aug 2026

What is the term for the ability of a material to return to its original shape after deformation?

A Elasticity
B Plasticity
C Ductility
D Malleability

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Correct Answer: Option A — Elasticity

Explanation: Elasticity describes a material's ability to return to its original shape and size after the removal of an applied deforming force, provided the force does not exceed the material's elastic limit or yield point.

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Hard nts Uploaded: 17 Aug 2026

The SI unit of electrical resistance is:

A Watt
B Ampere
C Volt
D Ohm

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Correct Answer: Option D — Ohm

Explanation: Electrical resistance, which opposes the flow of current through a conductor, is measured in Ohms, symbolized by the Greek letter omega, named after German physicist Georg Simon Ohm.

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Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What does a transformer do to alternating current?

A Changes the voltage of AC
B Converts AC to DC
C Converts DC to AC
D Changes the frequency of AC

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Correct Answer: Option A — Changes the voltage of AC

Explanation: A transformer changes the voltage of alternating current using electromagnetic induction between primary and secondary coils stepping voltage up or down depending on the turns ratio.

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Hard nts Uploaded: 06 Aug 2026

What is the term for the number of wave cycles that pass a given point per second?

A Wavelength
B Amplitude
C Frequency
D Period

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Correct Answer: Option C — Frequency

Explanation: Frequency measures how many complete wave cycles pass a fixed point every second, expressed in Hertz. Higher frequency waves carry more energy and, in sound, are perceived as higher pitched tones by the human ear.

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Medium fpsc Uploaded: 17 Aug 2026

Which of the following best describes 'latent heat'?

A Heat that changes temperature
B Heat gained by radiation
C Heat lost to surroundings
D Heat absorbed or released during a phase change without temperature change

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Correct Answer: Option D — Heat absorbed or released during a phase change without temperature change

Explanation: Latent heat is the amount of thermal energy absorbed or released by a substance during a change of physical state, such as melting or boiling, without any accompanying change in temperature.

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Medium css Uploaded: 17 Aug 2026

According to Einstein's mass-energy equivalence, E equals:

A mc
B mc^2
C mc^3
D m/c

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Correct Answer: Option B — mc^2

Explanation: Einstein's famous mass-energy equivalence formula states that energy equals mass multiplied by the square of the speed of light, showing that mass and energy are fundamentally interchangeable forms of the same entity.

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