- 5
- 2.5
- 1
- 0.2
We have,
h = Object height
u = Object distance = 25cm
D = Near point = 25cm
Now,
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : A star which appears blue will be much hotter than the sun
Reason : It is based on Wien's law
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A element used for radioactive carbon dating for more than 5600 years is
|
(a) C - 14 |
(b) U - 234 |
(c) U - 238 |
(d) Po - 94 |
If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image
|
(a) Remains same |
(b) |
(c) 2 times |
(d) Infinite |
There are two equipotential surface as shown in figure. The distance between them is r. The charge of –q coulomb is taken from the surface A to B, the resultant work done will be
|
(a) |
(b) |
(c) |
(d) |
