Angle between equipotential surface and lines of force is
|
(a) Zero |
(b) 180° |
(c) 90° |
(d) 45° |
Angle between equipotential surface and lines of force is
|
(a) Zero |
(b) 180° |
(c) 90° |
(d) 45° |
(c) 90°
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$\overrightarrow{\text{F}}.\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}.\overrightarrow{\text{r}}$
In a Young's double slit experiment, the fringe width will remain same, if (D = distance between screen and plane of slits, d = separation between two slits and λ = wavelength of light used)
|
(a) Both λ and D are doubled |
(b) Both d and D are doubled |
|
(c) D is doubled but d is halved |
(d) λ is doubled but d is halved |
The reason of seeing the Sun a little before the sunrise is
|
(a) Reflection of the light |
(b) Refraction of the light |
|
(c) Scattering of the light |
(d) Dispersion of the light |
The pressure exerted by an electromagnetic wave of intensity I (watts/m2) on a nonreflecting surface is [c is the velocity of light]
|
(a) Ic |
(b) |
(c) I/c |
(d) |
Plutonium decays with a half-life of 24000 years. If the plutonium is stored for 72000 years, then the fraction of plutonium that remains is
|
(a) |
(b) |
(c) |
(d) |
Plate resistance of two triode valves is 2 KW and 4 KW, amplification factor of each of the valves is 40. The ratio of voltage amplification, when used with 4 KW load resistance, will be
|
(a) 10 |
(b) |
(c) |
(d) |
The tangent galvanometer, when connected in series with a standard resistance can be used as
|
(a) An ammeter |
(b) A voltmeter |
|
(c) A wattmeter |
(d) Both an ammeter and a voltmeter |