Science - Physics Questions for SSC MTS

Newton's Laws of Motion

Newton's three laws form the foundation of mechanics. The first law says objects stay at rest or moving unless a force acts (inertia). The second law connects force, mass, and acceleration mathematically. The third law states every action has an equal and opposite reaction. In SSC MTS, expect straightforward questions on identifying which law applies to a scenario, or calculating force/acceleration.

• First Law: Inertia - object resists change in motion
• Second Law: F = ma - force causes acceleration proportional to mass
• Third Law: Action-Reaction - forces always occur in pairs
• Common trap: Confusing which object experiences the reaction force
• Real-world: Seatbelts work because of inertia (First Law)

Work, Energy, and Power

Work is done when a force moves an object in the direction of the force. Energy is the capacity to do work. Power is the rate at which work is done. SSC MTS loves asking: calculate work from force and distance, or identify forms of energy (kinetic, potential, thermal). These concepts connect to real life: lifting objects, running, electricity consumption.

• Work = Force × Distance (only component in direction of motion counts)
• Kinetic Energy: energy of motion, depends on speed squared
• Potential Energy: stored energy due to position or state
• Power = Work / Time - measured in Watts
• Energy Conservation: total energy in closed system remains constant

Simple Machines

Simple machines reduce effort needed to do work by trading distance for force. Lever, pulley, inclined plane, wedge, screw, and wheel-axle are the six types. SSC MTS asks: identify the type of machine, calculate mechanical advantage, or explain how it reduces effort. Key insight: no machine creates energy—it only redistributes it.

• Lever: rigid bar pivoting on fulcrum; three classes based on position of load, effort, fulcrum
• Pulley: wheel with rope; fixed pulley changes direction, movable pulley reduces effort
• Inclined Plane: sloped surface reduces force needed to lift object
• Mechanical Advantage (MA): ratio of load to effort, or distance ratio
• Efficiency: always less than 100% due to friction

Light and Optics

Light travels in straight lines and can reflect, refract, or be absorbed. Reflection follows the law: angle of incidence equals angle of reflection. Refraction bends light when it enters a denser medium. SSC MTS tests: mirror types (plane, concave, convex), lens types, and basic ray diagrams. Expect questions on image formation and everyday applications like mirrors and glasses.

• Reflection: light bounces off surface; angle in = angle out
• Refraction: light bends when entering different medium; depends on refractive index
• Plane Mirror: forms virtual, upright, same-size image
• Concave Mirror: converging; can form real or virtual images
• Convex Mirror: diverging; always forms virtual, diminished image
• Lens: convex (converging) and concave (diverging)

Electricity and Circuits

Electric current is flow of charge. Voltage drives current; resistance opposes it. Ohm's Law connects all three. SSC MTS asks: calculate current, voltage, or resistance in simple circuits; identify series vs parallel; understand power consumption. Real-world: household circuits, fuses, earthing, and electrical safety.

• Current (I): flow of electrons, measured in Amperes (A)
• Voltage (V): electrical potential difference, measured in Volts
• Resistance (R): opposition to current, measured in Ohms (Ω)
• Series Circuit: components in line; same current, voltages add
• Parallel Circuit: components in branches; same voltage, currents add
• Power: P = VI = I²R = V²/R; measured in Watts

Heat and Temperature

Temperature measures average kinetic energy of particles. Heat is energy transfer due to temperature difference. Specific heat capacity tells how much energy is needed to raise temperature of 1 kg by 1°C. SSC MTS tests: calculate heat absorbed/released, understand thermal expansion, and identify conduction vs convection vs radiation.

• Temperature: measure of hotness, in Celsius or Kelvin
• Heat: energy flowing from hot to cold object
• Specific Heat Capacity: energy per unit mass per degree
• Conduction: heat transfer through direct contact (solids)
• Convection: heat transfer through fluid movement (liquids, gases)
• Radiation: heat transfer via electromagnetic waves (no medium needed)

• Confusing velocity with acceleration: velocity is speed with direction; acceleration is change in velocity. A car moving at constant 60 km/h has zero acceleration even though velocity is high.
• Forgetting to include direction in force problems: Newton's laws are vector equations. A 10 N force left and 10 N force right cancel out, not add.
• Mixing up kinetic and potential energy: KE depends on speed (v²), PE depends on height. A fast object at ground level has high KE but zero PE.
• Assuming all simple machines have MA > 1: some machines (like a screwdriver) trade force for distance, so MA can be less than 1 but effort is easier.
• Treating series and parallel resistance backwards: series resistances add (total increases); parallel resistances decrease total (reciprocals add).
• Forgetting units in calculations: 5 kg × 10 m/s² = 50 N, not 50. Always write units to catch errors.

• F = ma: Force Makes Acceleration (Newton's Second Law)
• KE = (1/2)mv²: Kinetic Energy depends on speed Squared (fast objects have lots of KE)
• PE = mgh: Potential Energy = mass × gravity × height (higher = more stored energy)
• OHMS: Ohm's Law Makes Sense (V = IR: Voltage = current × resistance)
• Series = Add (resistances add like people in a line); Parallel = Reciprocals (like multiple doors reducing wait time)
• Heat flows from Hot to Cold (never backwards without work, like a fridge)
• Lever: Long Effort arm = Low effort needed (mechanical advantage > 1)

• SSC MTS Physics is 9th-10th grade level: focus on concepts and basic calculations, not advanced derivations. If a question looks complex, you're overthinking it.
• Numerical problems dominate: always show F = ma, V = IR, Q = mcΔT type calculations. Examiners give partial credit for correct formula even if final answer is wrong.
• Diagram-based questions are common: simple machines, mirror/lens ray diagrams, circuit diagrams. Practice drawing and labeling these quickly.
• Watch for unit conversions: questions mix m/s and km/h, or J and kJ. Convert first, then calculate. Example: 72 km/h = 20 m/s.
• Real-world application questions: 'Why do we use pulleys?' or 'How does a fuse protect a circuit?' Answer in 1-2 sentences linking concept to everyday use.
• Time management: Physics questions take 2-3 minutes each. If stuck, move on and return later. Don't spend 5 minutes on a 1-mark question.