Physics 1 Questions & Answers

Physics 1 Questions & Answers ........ occur when a disturbance causes oscillations perpendicular to the propagation A) Longitudinal waves B) Longitudinal mechanical waves C) sound waves D) Transverse mechanical waves - ANSWER: D) Transverse mechanical waves 5 kilowatts/hour (kWh) is equal to.... A) 1 watt for 5 hours B) 1000 watts for 1 hour C) 5000 watts for 5 hours D) 5000 watts for 1 hour - ANSWER: D) 5000 watts for 1 hour 5kJ of work is done when a machine lifts a box 10m off the ground, what is the box's mass in Kg ? (g= 9.8m/s2 ) A) 15 B) 16 C) 48 D) 51 - ANSWER: D) 51 A 0.5 kg piece of metal with a specific heat capacity of 376 j/kg drops in temperature by 20k, calculate the amount of energy lost A) 15040 J B) 7520 J C) 3760 J D) 1880 J - ANSWER: C) 3760 J A 30N force acts on a box with a mass of 3kg from the east. Calculate the frictional force if the coefficient of the kinetic friction is 0.2. (g=10m/s2 ) A) 6N B) 60N C) 18N D) 3N - ANSWER: A) 6N A car accelerates from rest at a constant rate 5m/s2 ,the time required for its speed to reach 30 m/s is equal to...? A) 150 s B) 35 s C) 25 s D) 6 s - ANSWER: D) 6 s A current of 6A is flowing into a wire of length 1.5 m vertically positioned by a uniform magnetic field of 0.5 T, How strong is the force acting on the wire? A) 3 N B) 4 N C) 4.5 N D) 6 N - ANSWER: C) 4.5 N A device has a power of 16 W and a resistance of 4 Ω what is the strength of the current passing through it? A) 2 A B) 4 A C) 20 A D) 64 A - ANSWER: A) 2 A A device used to measure very small electric currents A) Voltmeter B) Ammeter C) Electroscope D) Galvanometer - ANSWER: D) Galvanometer A force ( F ) with a value of 10N acts on 3 objects as represented in the figure, if you know that the masses of these objects respectively are 5kg, 3 kg, 2kg then the acceleration (in m/s2 ) of the objects is... A) 1 B) 2 C) 3.3 D) 5 - ANSWER: A) 1 A frequency of 4.5 MHz in Hz is ..... A) 4.5 × 10^3 B) 4.5 × 10^4 C) 4.5 × 10^6 D) 4.5 × 10^9 - ANSWER: C) 4.5 × 10^6