Railway Exams (RRB) - General Science

Mechanics, Heat, Sound, Light & Electricity question bank (Physics (Class 10 CBSE Standard))

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Q1.

Physics (Sound & Wave Optics): A railway locomotive emits a whistle of frequency 600 Hz approaching a stationary observer at $20\text{ m/s}$ in 'Units of Measurement, SI Units and Measuring Instruments'. (Speed of sound in air $= 340\text{ m/s}$). The apparent frequency heard is:

(A)

637.5 Hz ($f' = f \frac{v}{v - v_s} = 600 \times \frac{340}{320}$) (Units of Measurement, SI Units and Measuring Instruments)

(B)

565.2 Hz

(C)

600 Hz

(D)

680 Hz

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Q2.

Chemistry (Periodic Classification): Along a period from left to right in the modern periodic table in 'Units of Measurement, SI Units and Measuring Instruments', which trend is correctly observed?

(A)

Atomic radius decreases and electronegativity increases (Units of Measurement, SI Units and Measuring Instruments)

(B)

Atomic radius increases and metallic character increases

(C)

Ionization enthalpy decreases

(D)

Valency continuously decreases from 8 to 0

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