- AThomas Young
- BMax planck
- CJames Clerk Maxwell
- DAlbert Einstein
Explanation:
In 1864, Maxwell predicted the existence of electromagnetic waves, the existence of which had not been confirmed before that time, and out of his prediction came the concept of light being a wave, or more specifically, a type of electromagnetic wave. It is a wide intuition that Albert Einstein proposed the dual nature theory but is not correct.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A printed page is seen through a glass slab place on it. The printed words appear raised. This is due to:
A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in
|
(a) Reduction of charge on the plates and increase of potential difference across the plates |
|
(b) Increase in the potential difference across the plate, reduction in stored energy, but no change in the charge on the plates |
|
(c) Decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates |
|
(d) None of the above |
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 |
In the diagram, the input is across the terminals A and C and the output is across the terminals B and D, then the output is

|
(a) Zero |
(b) Same as input |
(c) Full wave rectifier |
(d) Half wave rectifier |

Which of the following statement is wrong
|
(a) Infrared photon has more energy than the photon of visible light |
|
(b) Photographic plates are sensitive to ultraviolet rays |
|
(c) Photographic plates can be made sensitive to infrared rays |
|
(d) Infrared rays are invisible but can cast shadows like visible light rays |
The ratio activity of an element becomes 1/64th of its original value in 60 sec. Then the half life period is
|
(a) 5 sec |
(b) 10 sec |
(c) 20 sec |
(d) 30 sec |
The negative Zn pole of a Daniel cell, sending a constant current through a circuit, decreases in mass by 0.13g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is
|
(a) 0.242 g |
(b) 0.190 g |
(c) 0.141 g |
(d) 0.126 g |