Physics Questions for SSC MTS

Motion and Force

Motion is change in position. Speed tells you how fast; velocity tells you how fast AND in which direction. Acceleration is how quickly velocity changes. Force is a push or pull that changes motion. Newton's three laws are the foundation: (1) object at rest stays at rest unless pushed, (2) F equals ma, (3) every action has equal opposite reaction. In SSC MTS, expect questions on average speed, relative motion, and identifying action-reaction pairs in daily life.

• Speed = distance/time; Velocity = displacement/time (velocity has direction)
• Acceleration = change in velocity / time taken
• Newton's Second Law: Force = mass × acceleration (F = ma)
• Weight = mass × gravity (W = mg, where g = 10 m/s² or 9.8 m/s²)
• Friction opposes motion; static friction > kinetic friction
• Momentum = mass × velocity; conserved in collisions

Work, Energy, and Power

Work is done when force moves an object in the direction of force. Energy is capacity to do work. Two main types: kinetic (motion) and potential (stored). Power is how fast work is done. These concepts connect directly to machines and real-world scenarios like lifting, running, and electricity consumption. SSC MTS loves asking about energy conservation and simple power calculations.

• Work = Force × Distance (only distance in direction of force counts)
• Kinetic Energy = (1/2) × mass × velocity squared
• Potential Energy = mass × gravity × height
• Power = Work / Time (measured in Watts)
• Energy is conserved: total energy before = total energy after
• Efficiency = Useful Work Output / Total Work Input × 100%

Heat and Temperature

Temperature measures how hot or cold something is (in Celsius or Kelvin). Heat is energy transfer from hot to cold. Specific heat capacity tells you how much energy is needed to raise 1 kg of a substance by 1°C. Thermal expansion happens when objects heat up and expand. SSC MTS asks about heat transfer methods, temperature conversions, and everyday thermal phenomena like cooking and melting.

• Temperature: Celsius to Kelvin = C + 273
• Heat = mass × specific heat capacity × temperature change
• Three heat transfer methods: conduction (direct contact), convection (fluid movement), radiation (waves)
• Specific heat capacity of water = 4200 J/kg°C (highest among common substances)
• Melting point: temperature at which solid becomes liquid
• Boiling point: temperature at which liquid becomes gas

Light and Optics

Light travels in straight lines at 3 × 10^8 m/s. Reflection is bouncing off a surface (angle of incidence = angle of reflection). Refraction is bending when light enters a different medium. Lenses focus or spread light. Mirrors can be plane (flat), concave (curved inward), or convex (curved outward). SSC MTS tests basic reflection, refraction, lens types, and everyday applications like mirrors and spectacles.

• Light travels in straight lines; speed in vacuum = 3 × 10^8 m/s
• Reflection: angle of incidence = angle of reflection (measured from normal)
• Refraction: light bends when entering denser medium (slows down)
• Plane mirror: image is virtual, erect, same size, laterally inverted
• Concave mirror: converges light; used in torches, telescopes
• Convex mirror: diverges light; used in vehicle side mirrors (wider view)

Electricity and Magnetism

Electric current is flow of electrons. Voltage is electrical pressure. Resistance opposes current flow. Power consumption depends on voltage and current. Magnetism is produced by moving charges and permanent magnets. Electromagnets combine electricity and magnetism. SSC MTS focuses on Ohm's Law, power calculations, and practical applications like household circuits, fuses, and electromagnets.

• Current (I) measured in Amperes; Voltage (V) in Volts; Resistance (R) in Ohms
• Ohm's Law: V = I × R
• Power = Voltage × Current (P = VI); also P = I²R or P = V²/R
• Series circuit: same current, voltages add; total R = R1 + R2
• Parallel circuit: same voltage, currents add; 1/R_total = 1/R1 + 1/R2
• Fuse protects circuit by breaking if current exceeds safe limit
• Electromagnet: coil of wire carrying current around iron core produces magnetic field

Simple Machines

Simple machines reduce effort needed to do work. Lever has fulcrum, load, and effort. Pulley changes direction of force. Inclined plane reduces force needed to lift. Wedge and screw are variations. Mechanical advantage tells you how much easier the machine makes work. SSC MTS asks about identifying machine types, calculating mechanical advantage, and real-world examples.

• Mechanical Advantage = Load / Effort (or distance moved by effort / distance moved by load)
• Lever: Class 1 (fulcrum in middle), Class 2 (load in middle), Class 3 (effort in middle)
• Pulley: fixed pulley changes direction; movable pulley reduces effort
• Inclined plane: reduces force needed; advantage = length of slope / height
• No machine is 100% efficient due to friction
• Efficiency = Mechanical Advantage (ideal) / Velocity Ratio (actual)

• Confusing speed and velocity: Speed is just how fast (scalar), velocity includes direction (vector). SSC often gives distance and asks for speed, then velocity — don't mix them up.
• Using wrong value of g: SSC MTS uses g = 10 m/s² for simplicity. Don't use 9.8 unless specifically asked. This changes all weight and PE calculations.
• Forgetting to convert units: A car travels 72 km/h. Convert to m/s: 72 × 5/18 = 20 m/s. Many aspirants skip this and get wrong answers.
• Mixing up heat and temperature: Heat is energy (joules), temperature is degree (Celsius/Kelvin). A cup of hot water and a swimming pool at same temperature have different heat content.
• Confusing reflection and refraction: Reflection bounces off surface (same medium), refraction bends entering new medium. Mirror = reflection, water glass = refraction.
• Series vs Parallel circuits: In series, current is same everywhere and resistances add. In parallel, voltage is same and currents add. Reverse these and calculations fail.

• SUVAT: Speed, Unit, Velocity, Acceleration, Time — remember these five are linked in motion problems.
• KE and PE: Kinetic = motion (K for moving), Potential = position (P for place). KE = (1/2)mv², PE = mgh.
• Heat transfer: CAR — Conduction (direct contact), convection (Air/fluid), Radiation (waves).
• Ohm's Law VIR: Visualize a triangle with V at top, I and R at bottom. Cover what you want; the remaining symbols show the formula.
• Lever classes: 1-2-3 = Fulcrum-Load-Effort positions. Class 1 is seesaw (fulcrum middle), Class 2 is wheelbarrow (load middle), Class 3 is tweezers (effort middle).

• SSC MTS Physics is conceptual, not derivation-heavy. Focus on understanding 'why' not 'how to derive.' Most questions ask to identify, define, or calculate using given formula.
• Numerical problems are straightforward: plug numbers into formula, calculate. No multi-step reasoning. Practice unit conversions (km/h to m/s, Celsius to Kelvin) heavily.
• Diagram-based questions appear frequently: given a mirror, lens, or circuit diagram, identify what happens. Memorize mirror and lens behavior by type.
• Recent papers show 1-2 questions on everyday applications: 'Why is a convex mirror used in vehicles?' or 'How does a fuse protect a circuit?' Answer in 1-2 sentences.
• Time management: Physics questions are faster than Reasoning. Allocate 1-1.5 minutes per question. Skip if unsure; come back only if time permits.
• Common trap: Questions give data in mixed units (km and m, hours and seconds). Always convert to SI units first before applying formula.