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Matter, Chemical Reactions & Periodic Classification question bank (Chemistry (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 'Matter: Solid, Liquid, Gas, Plasma and Bose-Einstein Condensate'. (Speed of sound in air $= 340\text{ m/s}$). The apparent frequency heard is:

(A)

637.5 Hz ($f' = f \frac{v}{v - v_s} = 600 \times \frac{340}{320}$) (Matter: Solid, Liquid, Gas, Plasma and Bose-Einstein Condensate)

(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 'Matter: Solid, Liquid, Gas, Plasma and Bose-Einstein Condensate', which trend is correctly observed?

(A)

Atomic radius decreases and electronegativity increases (Matter: Solid, Liquid, Gas, Plasma and Bose-Einstein Condensate)

(B)

Atomic radius increases and metallic character increases

(C)

Ionization enthalpy decreases

(D)

Valency continuously decreases from 8 to 0

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