Physics has the lowest academic weightage in AFNS (~10%), but that does not mean ignore it. 10 correct questions from physics can swing your rank significantly when top candidates are separated by single marks. These 30 solved MCQs focus on concepts that appear repeatedly — no complex calculations needed.
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Section 1: Mechanics
Q1. Which of Newton’s laws explains why a car passenger lurches forward when the car brakes suddenly?
A) First Law B) Second Law C) Third Law D) Law of Gravitation
✅ Answer: A — Newton’s First Law (Inertia)
The body tends to continue its forward motion when the car decelerates — inertia of motion. First law: an object in motion stays in motion unless acted upon by an external force.
Q2. The SI unit of force is:
A) Joule B) Watt C) Newton D) Pascal
✅ Answer: C — Newton (N)
Force = mass × acceleration (F = ma). 1 Newton = 1 kg·m/s². Joule is energy, Watt is power, Pascal is pressure.
Q3. The acceleration due to gravity on Earth is approximately:
A) 8.9 m/s² B) 9.8 m/s² C) 10.8 m/s² D) 11.2 m/s²
✅ Answer: B — 9.8 m/s²
g ≈ 9.8 m/s² (often approximated as 10 m/s² in calculations). This is a universal constant for near-Earth surface gravity.
Q4. What is the unit of pressure?
A) Newton B) Joule C) Pascal D) Watt
✅ Answer: C — Pascal (Pa)
Pressure = Force / Area. 1 Pascal = 1 N/m². Blood pressure is measured in mmHg (millimetres of mercury), not Pascal — but Pascal is the SI unit.
Q5. A body is in equilibrium when:
A) It is moving fast B) Net force acting on it is zero C) It is accelerating D) Gravity is absent
✅ Answer: B — Net force is zero
Equilibrium = balanced forces (and balanced torques for rotational equilibrium). A book on a table is in equilibrium — gravity down equals normal force up.
Section 2: Work, Energy & Power
Q6. The SI unit of energy is:
A) Watt B) Newton C) Joule D) Calorie
✅ Answer: C — Joule (J)
1 Joule = 1 N·m = 1 kg·m²/s². Watt is the unit of power (energy per second). Calorie is a non-SI unit of heat energy.
Q7. Which form of energy does a stretched spring possess?
A) Kinetic B) Chemical C) Elastic Potential D) Thermal
✅ Answer: C — Elastic Potential Energy
Compressed or stretched elastic objects store elastic potential energy. When released, it converts to kinetic energy.
Q8. Power is defined as:
A) Force × Distance B) Mass × Acceleration C) Work / Time D) Energy × Time
✅ Answer: C — Work / Time
Power = Work done / Time taken. SI unit: Watt (W). 1 W = 1 J/s. Horsepower is an older unit (1 HP ≈ 746 W).
Section 3: Waves & Sound
Q9. Ultrasound is used in hospitals for:
A) X-ray imaging B) Scanning soft tissues and organs C) Blood tests D) Sterilising instruments
✅ Answer: B — Scanning soft tissues and organs
Ultrasound (>20,000 Hz) is safe (no radiation), used in obstetric scanning, echocardiography, and abdominal imaging. Directly relevant to nursing context.
Q10. Sound travels fastest in:
A) Vacuum B) Air C) Water D) Steel
✅ Answer: D — Steel (solid)
Sound speed: solids > liquids > gases. Sound cannot travel in vacuum at all (no medium). In air ≈ 343 m/s; in water ≈ 1500 m/s; in steel ≈ 5000 m/s.
Q11. The frequency of sound that humans can hear ranges from:
A) 0–200 Hz B) 20–20,000 Hz C) 200–2000 Hz D) 20,000–200,000 Hz
✅ Answer: B — 20 to 20,000 Hz
Below 20 Hz = infrasound; above 20,000 Hz = ultrasound. Both exist but are inaudible to humans.
Q12. Echo is caused by:
A) Refraction of sound B) Absorption of sound C) Reflection of sound D) Diffraction of sound
✅ Answer: C — Reflection of sound
Echo = reflection of sound from a distant surface. Sonar and ultrasound both use this principle.
Section 4: Light & Optics
Q13. A concave lens is used to correct:
A) Hyperopia (long-sightedness) B) Myopia (short-sightedness) C) Astigmatism D) Colour blindness
✅ Answer: B — Myopia (short-sightedness)
Myopia: image forms in front of retina — corrected by concave (diverging) lens. Hyperopia: image forms behind retina — corrected by convex (converging) lens.
Q14. Speed of light in vacuum is:
A) 3 × 10⁶ m/s B) 3 × 10⁸ m/s C) 3 × 10¹⁰ m/s D) 3 × 10⁴ m/s
✅ Answer: B — 3 × 10⁸ m/s (300,000 km/s)
The speed of light c = 2.998 × 10⁸ m/s. This is the universal speed limit — nothing with mass can travel this fast.
Q15. Total internal reflection is used in:
A) Mirrors B) Optical fibres C) Prisms only D) Lenses
✅ Answer: B — Optical fibres
Optical fibres use total internal reflection to transmit light signals. Medically, fibre optics are used in endoscopes for internal examination.
Section 5: Electricity & Magnetism
Q16. Ohm’s Law states:
A) V = I/R B) V = IR C) I = VR D) R = VI
✅ Answer: B — V = IR
Voltage (V) = Current (I) × Resistance (R). If resistance doubles, current halves (at constant voltage). Units: Volt, Ampere, Ohm.
Q17. Which of the following is a good conductor of electricity?
A) Rubber B) Plastic C) Copper D) Glass
✅ Answer: C — Copper
Metals (copper, silver, aluminium) are good conductors due to free electrons. Rubber, plastic, and glass are insulators.
Q18. MRI uses which type of radiation?
A) X-rays B) Gamma rays C) Radio waves + magnetic field D) Ultrasound
✅ Answer: C — Radio waves + strong magnetic field
MRI (Magnetic Resonance Imaging) uses no ionising radiation. It uses strong magnetic fields and radio waves — safer than X-ray or CT for soft tissue imaging. Highly relevant nursing knowledge.
Section 6: Heat & Thermodynamics
Q19. Normal human body temperature is:
A) 35°C B) 37°C C) 39°C D) 40°C
✅ Answer: B — 37°C (98.6°F)
Normal oral temperature = 36.5–37.5°C. Above 38°C = fever. Below 35°C = hypothermia. Directly relevant clinical knowledge for nursing candidates.
Q20. Heat transfer through a vacuum is by:
A) Conduction B) Convection C) Radiation D) Not possible
✅ Answer: C — Radiation
Radiation (electromagnetic waves) requires no medium. Sun’s heat reaches Earth through vacuum by radiation. Conduction and convection both need a medium (solid, liquid, or gas).
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FAQs
How much physics is in the AFNS test?
Physics carries approximately 10% of the total AFNS academic test weightage. Focus on conceptual understanding (Newton’s laws, energy types, light, sound, electricity) rather than complex numerical calculations.
Which physics topics are most repeated in AFNS?
Optics (eye defects and correction, light speed), mechanics (Newton’s laws, energy types), sound and ultrasound (medically relevant), electricity (Ohm’s law, conductors), and medical physics (MRI, X-ray, ultrasound applications) appear most frequently.
