The size of an object as perceived by an eye depends primarily on:
- AActual size of the object.
- BDistance of the object from the eye.
- CAperture of the pupil.
- DSize of the image formed on the retina.
The size of an object as perceived by an eye depends primarily on:
Explanation:
An eye consists of a lens that works on the principle on which a glass lens works. It forms the image on the screen called retina. The magnification, in this case, depends on the ratio of the image to the object height.
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An external resistance R is connected to a battery of e.m.f. V and internal resistance r. The joule heat produced in resistor R is maximum when R is equal to
|
(a) r |
(b) |
(c) 2r |
(d) Infinitely large |
A galvanometer of 25 W resistance can read a maximum current of 6mA. It can be used as a voltmeter to measure a maximum of 6 V by connecting a resistance to the galvanometer. Identify the correct choice in the given answers
|
(a) 1025 W in series |
(b) 1025 W in parallel |
(c) 975 W in series |
(d) 975 W in parallel |
According to Bohr's theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be
|
(a) 2πh |
(b) πh |
(c) |
(d) |
An alpha particle is accelerated through a potential difference of . Its kinetic energy will be
|
(a) 1 MeV |
(b) 2 MeV |
(c) 4 MeV |
(d) 8 MeV |
The current in the following circuit is
|
(a) |
(b) |
(c) |
(d) 1A |
A condenser has a capacity 2μF and is charged to a voltage of 50 V. The energy stored is
|
(a) 25 × 105 Joule |
(b) 25 Joule |
(c) 25 × 10 erg |
(d) 25 × 103 erg |