Explanation:
$\text{Z}_\text{L}=\text{WL}\ \ \ \text{Z}_\text{C}=\frac{1}{\text{WC}}$
$\text{w}\uparrow,\text{Z}_\text{L}\uparrow\text{Z}_\text{c}\downarrow$
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Speed of recession of galaxy is proportional to it's distance
|
(a) Directly |
(b) Inversely |
(c) Exponentially |
(d) None of these |
Which of the following spectral series in hydrogen atom give spectral line of 4860 Å
|
(a) Lyman |
(b) Balmer |
(c) Paschen |
(d) Brackett |
The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is 90 cm. The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are
|
(a) 30 cm and 60 cm |
(b) 30 cm and – 45 cm |
|
(c) 45 cm and 90 cm |
(d) 15 cm and 45 cm |
A body has – 80 micro coulomb of charge. Number of additional electrons in it will be
|
(a) 8 |
(b) 80 |
(c) 5 |
(d) 1.28 |
When the temperature of silicon sample is increased from 27℃ to 100℃, the conductivity of silicon will be
|
(a) Increased |
(b) Decreased |
(c) Remain same |
(d) Zero |
The electrons are emitted in the photoelectric effect from a metal surface
|
(a) Only if the frequency of the incident radiation is above a certain threshold value |
|
(b) Only if the temperature of the surface is high |
|
(c) At a rate that is independent of the nature of the metal |
|
(d) With a maximum velocity proportional to the frequency of the incident radiation |
A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10–5 weber. the inductance is
|
(a) 0.2 mH |
(b) 2.0 mH |
(c) 0.02 mH |
(d) None of these |
4 bulbs marked 40 W, 250 V are connected in series with 250 V mains. The total power is
|
(a) 10 W |
(b) 40 W |
(c) 320 W |
(d) 160 W |
