n identical bulbs, each designed to draw a power p from a certain voltage supply, are joined in series across that supply. The total power which they will draw is
|
(a) |
(b) p/n |
(c) p |
(d) np |
(b) p/n
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light
|
(a) 5000 Å |
(b) 6000 Å |
(c) 7000 Å |
(d) 9000 Å |
The resistivity of a potentiometer wire is 40 
and its area of cross-section is 8 
. If 0.2 amp current is flowing through the wire, the potential gradient will be
|
(a) |
(b) |
(c) 3.2 |
(d) 1 volt/m |
Resistivity of a semiconductor depends on
|
(a) Shape of semiconductor |
|
(b) Atomic nature of semiconductor |
|
(c) Length of semiconductor |
|
(d) Shape and atomic nature of semiconductor |
Focal length of a plane mirror is
|
(a) Zero |
(b) Infinite |
(c) Very less |
(d) Indefinite |
Half lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the sample of A and B have equal number of nuclei. After 80 minutes, the ratio of remaining number of A and B nuclei is
|
(a) 1 : 16 |
(b) 4 : 1 |
(c) 1 : 4 |
(d) 1 : 1 |
Stars are twinkling due to
|
(a) Diffraction |
(b) Reflection |
(c) Refraction |
(d) Scattering |
