A engine pumps up 100 kg of water through a height of 10 m in 5s. Given that, the efficiency of engine is 60%. If g = 10 ms-2, the power of this engine is
3.3 kW
0.33 kW
0.033 kW
33 kW
If the electric flux entering and leaving an enclosed surface respectively are , the electric charge inside the surface will be
If the sun rays are incidenting at 60° angle and intensity is I. If the sun rays are made incident at 30° angle, then what will be the intensity?
3 l
The reason of current flow in p-n junction in forward bias is
drifting of charge carriers
drifting of minority charge carriers
diffussion of charge carriers
All of the above
Relation between wavelength of photon and electron of same energy is
λph > λe
λph < λe
λph = λe
= constant
If prism angle α = 1o , μ= 1.54, distance between screen and prism (D) = 0. 7 m, distance between prism and source nm, then in Fresnal biprism find the value of β (fringe width).
10-4 m
10-3 mm
10-4 × m
According to Bohr's model of hydrogen atom, relation between principal quantum number n and radius of stable orbit is
r ∝
r ∝ n
r ∝
r ∝ n2
Work function of a metal is 5.2 x 10-18, then its threshold wavelength will be
736.7 Ao
760.7 Ao
301 Ao
344.4 Ao
Remaining quantity (in%) of radioactive element after 5 half lives is
4.125%
3.125%
31.1%
42.125%
To get three images of a single object, we should have two plane mirrors at an angle of
60o
90o
120o
30o
B.
90o
Number of images =
n =
3 =
θ = 90o