- ✓by giving it extra electrons
- Bby removing some electrons from it
- Cby giving it some protons
- Dby removing some neutrons from it
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A diffraction is obtained by using a beam of red light. What will happen if the red light is replaced by the blue light
|
(a) Bands will narrower and crowd full together |
|
(b) Bands become broader and further apart |
|
(c) No change will take place |
|
(d) Bands disappear |
Which of the following statement is true about magnetic moments of atoms of different elements
|
(a) All have a magnetic moment |
|
(b) None has a magnetic moment |
|
(c) All acquire a magnetic moment under external magnetic field and in same direction as the field |
|
(d) None of the above statements are accurate |
The sun emits a light with maximum wavelength 510 mm while another star X emits a light with maximum wavelength of 350 nm. What is the ratio of surface temperature of sun and the star X
|
(a) 2.1 |
(b) 0.68 |
(c) 0.46 |
(d) 1.45 |
A wire carrying current i is shaped as shown. Section AB is a quarter circle of radius r. The magnetic field is directed

|
(a) At an angle π/4 to the plane of the paper |
|
(b) Perpendicular to the plane of the paper and directed in to the paper |
|
(c) Along the bisector of the angle ACB towards AB |
|
(d) Along the bisector of the angle ACB away from AB |
The momentum of a photon in an X-ray beam of
metre wavelength is
|
(a) 1.5 |
(b) 6.6 |
|
(c) 6.6 |
(d) 2.5 |
In the given figure, the equivalent resistance between the points A and B is
|
(a) 8 W |
(b) 6 W |
(c) 4 W |
(d) 2 W |