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?

5 years ago

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

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?

5 years ago

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

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?

5 years ago

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

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

5 years ago

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

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?

5 years ago

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

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

5 years ago

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

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

5 years ago

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

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

5 years ago

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

If the fraction of the atoms of a radioactive material left after 120years is 1/64. What is the half-life of the material?

5 years ago

A. 24 years B. 20 years C. 10 years D. 2 years Correct Answer: Option B - 20 years Explanation…

An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is?

5 years ago

A. 80.0W B. 40.0W C. 10.0W D. 0.1W Correct Answer: Option A = 80.0W Explanation Power input = 3KW =…

Show more Posts
Show previous Posts