An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If amg = 1.5, the distance of bubble from refracting surface is
|
(a) 1.2 cm |
(b) 3.2 cm |
(c) 2.8 cm |
(d) 1.6 cm |
(a) 1.2 cm
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$\text{y}=\text{a}_1\sin\omega\text{t}$
$\text{y}=\text{a}_2\sin(\omega\text{t}+\in)$
$\text{y}=\text{a}_1\sin2\omega\text{t}$
$\text{y}=\text{a}_2\sin2(\omega\text{t}+\in)$
Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be
|
(a) Twice of the second |
(b) Half of the second |
|
(c) Equal to the second |
(d) Four times of the second |
A man is looking at a small object placed at his near point. Without altering the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is:
The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is
|
(a) 150 cm |
(b) 60 cm |
(c) 30 cm |
(d) 40 cm |
A zone plate of focal length 60 cm, behaves as a convex lens, If wavelength of incident light is 6000
, then radius of first half period zone will be
|
(a) 36 |
(b) 6 |
(c) |
(d) 6 |
In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled
|
(a) x |
(b) x/4 |
(c) 4x |
(d) 2x |
Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true
| (a) Q is of non-magnetic material |
|
(b) Q is a bar magnet identical to P, and its north pole placed on top of P's north pole |
| (c) Q is of unmagnetized ferromagnetic material |
| (d) Nothing can be said about Q's properties |
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 |
