physics

A handbag containing some load weighing 162N is carried by two students each holding the handle of the bag next to him. If each handle is pulled 60° to the vertical, find the force on each student’s arm?

A. 81N B. 121N C. 162N D. 324N Correct Answer: Option C - 162N

4 years ago

An engineer intends to deviate a light ray from its path by 120° through reflection from a plane mirror. Calculate the angle of incidence?

A. 60° B. 40° C. 30° D. 20° Correct Answer: Option C - 30° Explanation Angle of deviation = 180…

4 years ago

A transverse wave is applied to a string whose mass per unit length is 3 x 10−²kgm−¹. If the string is under a tension 12N; the speed of the propagation of the wave is?

A. 5 ms−¹ B. 20 ms−¹ C. 30 ms−¹ D. 40 ms−¹ Correct Answer:  Option B = 20 ms−¹

4 years ago

A travelling wave moving from left to right has an amplitude of 0.15m; a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is?

A. y = 0.15 sin 200π(x - 5.5t) B. y = 0.15 sin π(0.01x - 5.5t) C. y = 0.15…

4 years ago

The velocity y of a particle in a time t is given by the equation. y = 10 + 2t². Find the instantaneous acceleration after 5 seconds?

A. 60 ms−² B. 20 ms−² C. 15 ms−² D. 10 ms−² Correct Answer: Option B - 20 ms−² Explanation…

4 years ago

Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is?

A. 1.7V B. 2.0V C. 8.0V D. 15.0V Correct Answer: Option B - 2.0V Explanation For a photoemitted electron, eV…

4 years ago

A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is?

A. 0.2N B. 0.8N C. 3.2N D. 8.0N Correct Answer: Option B - 0.8N Explanation The force on the conductor…

4 years ago

A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is?

A. 25% B. 33% C. 50% D. 75% Correct Answer: Option D - 75% Explanation Efficiency = Output/input x 100/1…

4 years ago

A 2H inductor has negligible resistance and is connected to a 50/π Hz A.C. Supply. The reactance of the inductor is?

A. 200 Ω B. 50 Ω C. 100/π Ω D. 25/π Ω Correct Answer: Option A = 200 Ω Explanation…

4 years ago

A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are?

A. beta rays B. gamma rays C. x-rays D. ultra-violet rays Correct Answer: Option A - beta rays

4 years ago
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