A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of
|
(a) Green colour glasses |
(b) Red colour glasses |
|
(c) Smoky colour glasses |
(d) None of the above |
(d) None of the above
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A heating coil can heat the water of a vessel from 20℃ to 60℃ in 30 minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be (neglecting thermal capacity of the coils)
|
(a) 60 minutes |
(b) 30 minutes
|
(c) 15 minutes |
(d) 7.5 minutes |
What is the reading of voltmeter in the following figure
|
(a) 3 V |
(b) 2 V |
(c) 5 V |
(d) 4 V |
The colour of the positive column in a gas discharge tube depends on
|
(a) The type of glass used to construct the tube |
(b) The gas in the tube |
|
(c) The applied voltage |
(d) The material of the cathode |
A convex mirror of focal length f forms an image which is 
times the object. The distance of the object from the mirror is
|
(a) (n – 1)f |
(b) |
(c) |
(d) (n + 1)f |
A bar magnet is oscillating in the Earth’s magnetic field with a period T. What happens to its period and motion if its mass is quadrupled
|
(a) Motion remains S.H.M. with time period = 2T |
|
(b) Motion remains S.H.M. with time period = 4T |
|
(c) Motion remains S.H.M. and period remains nearly constant |
|
(d) Motion remains S.H.M. with time period = |
In a copper voltameter experiment, current is decreased to one-fourth of the initial value but it is passed for four times the earlier duration. Amount of copper deposited will be
|
(a) Same |
(b) One-fourth the previous value |
|
(c) Four times the previous value |
(d) |
Which of the following gates will have an output of 1
|
(a)
(a)
|
(b)
|
(c)
|
(d)
|
A sphere of radius 1 cm has potential of 8000 V, then energy density near its surface will be
|
(a) 64 |
(b) 8 |
(b) 8 |
(d) 2.83 |
