physics

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

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

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

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

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

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

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