- Aremains unchanged
- ✓decreases
- Cincreases
- Dfirst decreases and then increases
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Hubble's law states that the velocity with which the 'milky way' is moving away from the earth is proportional to
|
(a) Square of the distance of the milky way from the earth |
|
(b) Distance of milky way from the earth |
|
(c) Mass of the milky way |
|
(d) Product of the mass of the milky way and its distance from the earth |
The kinetic energy of electron and proton is
. Then the relation between their de-Broglie wavelengths is
|
(a) |
(b) |
(c) |
(d) |
If the atom
follows the Bohr model and the radius of
is n times the Bohr radius, then find n
|
(a) 100 |
(b) 200 |
(c) 4 |
(d) |
If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium. Its dispersive power will be
|
(a) 0.4 |
(b) 0.3 |
(c) 0.2 |
(d) 0.1 |
A person wears glasses of power – 2.0 D. The defect of the eye and the far point of the person without the glasses will be
|
(a) Nearsighted, 50 cm |
(b) Farsighted, 50 cm |
(c) Nearsighted, 250 cm |
(d) Astigmatism, 50 cm |
The distance of two points on the axis of a magnet from its centre is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be
| (a) 5 cm | (b) 25 cm | (c) 10 cm | (d) 20 cm |
$\frac{1}{2}\text{kx}^2$
$-\frac{1}{2}\text{kx}^2$
$\frac{1}{4}\text{kx}^2$
$-\frac{1}{4}\text{kx}^2$
A mass m = 20 g has a charge q = 30 mC. It moves with a velocity of 20 m/s and enters a region of electric field of 80 N/C in the same direction as the velocity of the mass. The velocity of the mass after 3 seconds in this region is
|
(a) 80 m/s |
(b) 56 m/s |
(c) 44 m/s |
(d) 40 m/s |