Charge on α -particle is
|
(a) |
(b) 1.6 |
(c) 3.2 |
(d) 6.4 |
Charge on α -particle is
|
(a) |
(b) 1.6 |
(c) 3.2 |
(d) 6.4 |
(c) 3.2
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A convex lens is made of a material having refractive index 1.2. Both the surfaces of the lens are convex. If it is dipped into water $(\mu=1.33),$ it will behave like:
The colour of a star is an indication of its
|
(a) Weight |
(b) Distance |
(c) Surface temperature |
(d) Size |
If
is the original mass of the substance of half life period
years, then the amount of substance left after 15 years is
|
(a) |
(b) |
(c) |
(d) |
α - particles of energy 400 KeV are bombarded on nucleus of
. In scattering of α - particles, its minimum distance from nucleus will be
|
(a) 0.59 nm |
(b) 0.59 Å |
(c) 5.9 pm |
(d) 0.59 pm |
The expected energy of the electrons at absolute zero is called
|
(a) Fermi energy |
(b) Emission energy |
(c) Work function |
(d) Potential energy |
The magnetic field due to a short magnet at a point on its axis at distance X cm from the middle point of the magnet is 200 Gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is
|
(a) 100 Gauss |
(b) 400 Gauss |
(c) 50 Gauss |
(d) 200 Gauss |
Which of the following statement is false
|
(a) Heat produced in a conductor is proportional to its resistance |
|
(b) Heat produced in a conductor is proportional to the square of the current |
|
(c) Heat produced in a conductor is proportional to charge |
|
(d) Heat produced in a conductor is proportional to the time for which current is passed |