Q.1 pls explain with method

Q.1 pls explain with method TALLENTEX CLASS-X / paper Code - S SECTION - A : PHYSICS nis section contains 15 Multiple Choice Questions. Each question has four choices (I), (2), (3) and (4) out of which ONLY ONE is correct. diagram shows the variation of air pressure from an alarm siren at particular instant. The speed of sound in the air is 340 m's. What is the period of alarm siren? (I) 0.98 ms (2) 1.2 ms (3) 2.35 ms (4) 2.9 ms 2. 3. 4. Speed cameras are used to detect motorists who break the speed limit. A number Of lines 2 m apart are painted on the road. AS a speeding Car Crosses the painted lines, the Camera takes two photographs, 0.5 second(s) apart. Photograph I The speed of the car in the photographs is Photograph 2 (1) 10 m/s (2) 14 m/s (3) 70 (4) 28 An electric bulb rated 220 V, 60 W is working at full efficiency. Another identical bulb is connected across the mains as shown What is the total power ? Bulb 1 (1) 20 w (2) 40 w Bulb 2 220 v Mains (3) 30 w (4) 60 w The diagram Shows a bar magnet placed in a uniform magnetic field. When the magnet is allowed to move freely, it Will (I) remain stationary (3) tum 900 anti • clockwise CLASS-X/ paper Code - S fieE (2) turn 900 clock—wise (4) turn 1800 clerkwise 1/16 TALLENTEX

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