Two parallel pillars are 11 km away from an observer. The minimum distance between the pillars so that they can be seen separately will be
|
(a) 3.2 m |
(b) 20.8 m |
(c) 91.5 m |
(d) 183 m |
(a) 3.2 m
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The half-life of a radioactive substance is 3.6 days. How much of 20 mg of this radioactive substance will remain after 36 days
|
(a) 0.0019 mg |
(b) 1.019 mg |
(c) 1.109 mg |
(d) 0.019 mg |
A nuclear bomb exploded 200 km above the surface of moon. The sound of explosion on the moon
|
(a) Will heard before the explosion is seen |
|
(b) Will be heard at the same time |
|
(c) Will be heard after explosion |
|
(d) Will not heard at all |
The refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is 6000 Å. The wavelength of this light when it passes through glass is
|
(a) 4000 Å |
(b) 6000 Å |
(c) 9000 Å |
(d) 15000 Å |
In general, metallic ropes are suspended on the carriers which take inflammable material. The reason is
|
(a) There speed is controlled |
|
(b) To keep the centre of gravity of the carrier nearer to the earth |
|
(c) To keep the body of the carrier in contact with the earth |
|
(d) Nothing should be placed under the carrier |