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A coil takes 15 min to boil a certain amount of water, another coil takes 20 min for the same process. Time taken to boil the same amount of water when both coil are connected in series
|
(a) 5 min |
(b) 8.6 min |
(c) 35 min |
(d) 30 min |
When the reflecting or refracting rays do not actually intersect but appear to intersect when produced backwards,
The kinetic energy of electron and proton is 
. Then the relation between their de-Broglie wavelengths is
|
(a) |
(b) |
(c) |
(d) |
The charge on a particle Y is double the charge on particle X. These two particles X and Y after being accelerated through the same potential difference enter a region of uniform magnetic field and describe circular paths of radii 
and 
respectively. The ratio of the mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
Which of the following gates will have an output of 1
|
(a)
(a)
|
(b)
|
(c)
|
(d)
|
The colour of a star is an indication of its
|
(a) Weight |
(b) Distance |
(c) Surface temperature |
(d) Size |
A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of
|
(a) 50° |
(b) 60° |
(c) 70° |
(d) 80° |
