20N
30N
40N
50N
Correct answer is C
Efficiency = M.A/V.R
75% = M.A/V.R
75/100 = M.A/5
M.A = 75(5)/100 = 3.75
But M.A = Load/Effort
3.75 = 150/Effort
Effort = 150/3.75
Effort = 40N
II and IV
I and IV
II and III
I and III
Correct answer is A
No explanation has been provided for this answer.
increase
decrease
remain the same
increase then decrease
Correct answer is B
Fresh water is less dense than the salt water, hence when the ship sails in fresh water, it will sink more, thus the fraction of the ship above the water surface will decrease.
∆x ∆Px ≥ h
∆x ∆Px = 0
∆x ∆Px < h
∆x ∆Px = ∞
Correct answer is A
No explanation has been provided for this answer.
allows current to flow in either direction
is non-linear
offers a high input resistance
allows current to flow only in one direction
Correct answer is D
A rectifier of an alternating current is a device which allows the flow of current only in one direction