Armature current in dc motor will be maximum when
|
(a) Motor has acquired maximum speed |
(b) Motor has acquired intermediate speed |
|
(c) Motor has just started moving |
(d) Motor is switched off |
(c) Motor has just started moving
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From the figure describing photoelectric effect we may infer correctly that
|
(a) Na and Al both have the same threshold frequency |
|
(b) Maximum kinetic energy for both the metals depend linearly on the frequency |
|
(c) The stopping potentials are different for Na and Al for the same change in frequency |
|
(d) Al is a better photo sensitive material than Na |
If three bulbs 60W, 100W and 200W are connected in parallel, then
|
(a) 200 W bulb will glow more |
(b) 60 W bulb will glow more |
|
(c) 100 W bulb will glow more |
(d) All the bulbs will glow equally |
A laser beam is used for carrying out surgery because it
|
(a) Is highly monochromatic |
(b) Is highly coherent |
|
(c) Is highly directional |
(d) Can be sharply focussed |
X-rays are known to be electromagnetic radiations. Therefore the X-ray photon has
| (a) Electric charge |
| (b) Magnetic moment |
| (c) Both electric charge and magnetic moment |
| (d) Neither electric charge nor magnetic moment |