- AElectric force
- BElectric field intensity
- CElectric potential
- DElectric power
Explanation:
Electric field intensity is the strength of an electric field at any point. It is equal to the electric force per unit charge experienced by a test charge placed at that point.
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A line passing through places having zero value of magnetic dip is called
|
(a) Isoclinic line |
(b) Agonic line |
(c) Isogonic line | (d) Aclinic line |
In order to obtain a real image of magnification 2 using a converging lens of focal length 20 cm, where should an object be placed
|
(a) 50 cm |
(b) 30 cm |
(c) – 50 cm |
(d) – 30 cm |
Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly
|
(a) 9.61 |
(b) 4.12 |
|
(c) 1.51 |
(d) 2.13 |
A galaxy is observed to be moving with a velocity of 8600 km-sec–1. If it is at a distance of 430 million light year from us, Hubble constant and corresponding age of the universe are respectively
|
(a) 2 |
(b) 2 |
|
(c) |
(d) None of these |
A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum p and energy E, then
| (a) p = 0, E = 0 | (b) p ¹ 0, E ¹ 0 | (c) p ¹ 0, E = 0 | (d) p = 0, E ¹ 0 |
In order to increase the angular magnification of a simple microscope, one should increase:
For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere
|
(a) ~ 1.2 |
(b) ~ |
(c) ~ |
(d) ~ |
The largest distance between the interatomic planes of a crystal is 10-7cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is
| (a) 1 Å | (b) 2 Å | (c) 10 Å | (d) 20 Å |