#navigation

Aptitude and Reasoning

Seema goes 30 km towards North from a fixed point, then after turning to her right she goes 15 km. After this she turns

Mechanistically, quantitative reasoning involves ratio, percentage and series logic determine correct calculation. This validates 15 km East because it meets mathematical and logical criteria, a pattern repeatedly demonstrated in aptitude and reasoning research.

Ref: Wren and Martin, High School English Grammar and Composition, Revised Edition, Chapter 12, discusses vocabulary and comprehension providing guidance for verbal aptitude and logical inference assessment.

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Aptitude and Reasoning

A person travelled 3 km towards west and continued walking 4 km towards north. The shortest distance from the point of s

The principle of quantitative reasoning explains that ratio, percentage and series logic determine correct calculation. Hence 5 km fits best because it meets mathematical and logical criteria, as documented in authoritative sources on aptitude and reasoning.

Ref: Agrawal, Quantitative Aptitude for Competitive Examinations, Chapter 5, Logical Reasoning and Probability, covers ratios, percentages, series completion, time-distance and analytical reasoning explaining problem-solving strategies for competitive assessments.

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Applications of EM Waves in Communication and Medicine

Why are microwaves used in aircraft navigation radar systems?

**Radio waves** effective for long-distance communication because low frequency waves diffract around Earth curvature and reflect from ionosphere, enabling beyond line-of-sight, used in AM (≈10⁶ Hz) ground wave, short wave sky wave. Microwaves used for satellite due to high frequency penetrates ionosphere and directional beam. The document explains that microwaves are suitable for radar systems due to their short wavelengths, which allow for precise detection and ranging. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields They have short wavelengt

Ref: NCERT > Physics Book > Electromagnetic Waves > Applications of EM Waves in Communication and Medicine

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Applications of EM Waves in Communication and Medicine

Why are microwaves suitable for radar systems in aircraft navigation?

**Microwaves in ovens** cause water molecules to rotate at 2.45 GHz, friction heats food, penetration depth few cm, efficient heating, also radar uses reflection of microwaves from objects, Doppler shift measures speed, medical diathermy uses microwaves for tissue heating. The document explains that microwaves have short wavelengths, making them suitable for radar systems as they can form narrow beams for precise detection. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields They have short wavelengths, illustrating EM wave transverse nature and Ma

Ref: NCERT > Physics Book > Electromagnetic Waves > Applications of EM Waves in Communication and Medicine

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