- A$\frac{1}{16}$th mass of one oxygen atom
- B$\frac{1}{14}$th mass of one atom of nitrogen
- C$\frac{1}{12}$th mass of one carbon-12 atom
- DNone of above
Explanation:
One a.m.u. is defined as mass of $\frac{1}{12}$th the mass of one carbon-12 atom.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Two wires of same material have length L and 2L and cross–sectional areas 4A and A respectively. The ratio of their specific resistance would be
|
(a) 1 : 2 |
(b) 8 : 1 |
(c) 1 : 8 |
(d) 1 : 1 |
A beam of light AO is incident on a glass slab (μ = 1.54) in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that
|
(a) The intensity is reduced down to zero and remains zero |
|
(b) The intensity reduces down some what and rises again |
|
(c) There is no change in intensity |
|
(d) The intensity gradually reduces to zero and then again increases |
In a semiconductor
|
(a) There are no free electrons at any temperature |
|
(b) The number of free electrons is more than that in a conductor |
|
(c) There are no free electrons at 0 K |
|
(d) None of these |
Assertion : Sun is at the galactic centre C of the milky way
Reason : All planets of solar system revolve around the sun.
|
(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 assertion is false but reason is true. |
Due to the earth's magnetic field, charged cosmic ray particles
| (a) Require greater kinetic energy to reach the equator than the poles |
|
(b) Require less kinetic energy to reach the equator than the poles |
| (c) Can never reach the equator |
| (d) Can never reach the poles |
If a proton and anti-proton come close to each other and annihilate, how much energy will be released
|
(a) 1.5 |
(b) 3 |
(c) 4.5 |
(d) None of these |
A microscope is focussed on a coin lying at the bottom of a beaker. The microscope is now raised up by 1 cm. To what depth should the water be poured into the beaker so that coin is again in focus ? (Refractive index of water is )
|
(a) 1 cm |
(b) |
(c) 3 cm |
(d) 4 cm |