The hyper-metropia is a
|
(a) Short-side defect |
(b) Long- side defect |
|
(c) Bad vision due to old age |
(d) None of these |
The hyper-metropia is a
|
(a) Short-side defect |
(b) Long- side defect |
|
(c) Bad vision due to old age |
(d) None of these |
(b) Long- side defect
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P-type semiconductor is formed when
A. As impurity is mixed in Si B. Al impurity is mixed in Si
C. B impurity is mixed in Ge D. P impurity is mixed in Ge
|
(a) A and C |
(b) A and D |
(c) B and C |
(d) B and D |
$8\ \pi\text{r}^2\text{S}$
$12\ \pi\text{r}^2\text{S}$
$16\ \pi\text{r}^2\text{S}$
$24\ \pi\text{r}^2\text{S}\cdot$
A proton enters a magnetic field of flux density 1.5
with a velocity of 2
at an angle of 30° with the field. The force on the proton will be
|
(a) 2.4 |
(b) 0.24 |
(c) 24 |
(d) 0.024 |
If a photon has velocity c and frequency n, then which of following represents its wavelength
|
(a) |
(b) |
(c) |
(d) hv |
A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is
|
(a) ∞ |
(b) Zero |
(c) |
(d) |
The wrong statement about electric lines of force is
|
(a) These originate from positive charge and end on negative charge |
|
(b) They do not intersect each other at a point |
|
(c) They have the same form for a point charge and a sphere |
|
(d) They have physical existence |
An image of the sun is formed by a lens of focal length of 30 cm on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current in this case is
|
(a) |
(b) I |
(c) 2I |
(d) 4I |