Great bear is a
|
(a) Star |
(b) Galaxy |
(c) Constellation |
(d) Planet |
Great bear is a
|
(a) Star |
(b) Galaxy |
(c) Constellation |
(d) Planet |
(c) Constellation
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Solar energy is mainly caused due to
|
(a) Fission of uranium present in the sun |
|
(b) Fusion of protons during synthesis of heavier elements |
|
(c) Gravitational contraction |
|
(d) Burning of hydrogen in the oxygen |
A condenser having a capacity 2.0 micro farad is charged to 200 volts and then the plates of the capacitor are connected to a resistance wire. The heat produced in joules will be
|
(a) 4 |
(b) 4 |
(c) 4 |
(d) 2 |
Atomic weight of boron is 10.81 and it has two isotopes
and
. Then ratio of
in nature would be
|
(a) 19 : 81 |
(b) 10 : 11 |
(c) 15 : 16 |
(d) 81 : 19 |
An amplitude modulated wave is modulated to 50%. What is the saving in power if carrier as well as one of the side bands are suppressed
|
(a) 70% |
(b) 65.4% |
(c) 94.4% |
(d) 25.5% |
In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V, X-rays will have the lowest wavelength of 0.3094 Å
| (a) 10 kV | (b) 20 kV | (c) 30 kV | (d) 40 kV |
To an observer on the earth the stars appear to twinkle. This can be ascribed to
|
(a) The fact that stars do not emit light continuously |
|
(b) Frequent absorption of star light by their own atmosphere |
|
(c) Frequent absorption of star light by the earth's atmosphere |
|
(d) The refractive index fluctuations in the earth's atmosphere |