When we see an object, the image formed on the retina is:
- AReal.
- BVirtual.
- CErect.
- DInverted.
When we see an object, the image formed on the retina is:
Explanation:
The retina acts as a screen in the eye; only real, inverted images can be obtained on the screen.
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Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P which gets deflected through an angle θ under the influence of magnets. The ratio of distance and
will be
|
(a) |
(b) |
(c) |
(d) |
Consider an electron (m = 9.1
confined by electrical forces to move between two rigid walls separated by 1.0
metre, which is about five atomic diameters. The quantised energy value for the lowest stationary state is
|
(a) 12 |
(b) 6.0 |
(c) 6.0 |
(d) 6 Joule |
A circular coil having N turns is made from a wire of length L meter. If a current I ampere is passed through it and is placed in a magnetic field of B Tesla, the maximum torque on it is
|
(a) Directly proportional to N |
(b) Inversely proportional to N |
|
(c) Inversely proportional to |
(d) Independent of N |
Through a semiconductor, an electric current is due to drift of
|
(a) Free electrons |
(b) Free electrons and holes |
|
(c) Positive and negative ions |
(d) Protons |
An electron is accelerated through a potential difference of 200 volts. If e/m for the electron be 1.6
coulomb/kg, the velocity acquired by the electron will be
|
(a) 8 |
(b) 8 |
(c) 5.9 |
(d) 5.9 |