- A10
- B20
- C30
- D40
Explanation:
Atomic mass (u) of Calcium is 40 u.
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Which of the following will produce greater chromatic aberration?
An object is placed at a distance of f/2 from a convex lens. The image will be
|
(a) At one of the foci, virtual and double its size |
|
(b) At 3f / 2, real and inverted |
|
(c) At 2f, virtual and erect |
|
(d) None of these |
Glass has refractive index m with respect to air and the critical angle for a ray of light going from glass to air is q. If a ray of light is incident from air on the glass with angle of incidence q, the corresponding angle of refraction is
|
(a) |
(b) 90° |
(c) |
(d) |
(USS 133) Indium impurity in germanium makes
|
(a) N-type |
(b) P-type |
(c) Insulator |
(d) Intrinsic |
A sample of radioactive element has a mass of 10 gm at an instant t = 0.The approximate mass of this element in the sample after two mean lives is
|
(a) 2.50 gm |
(b) 3.70 gm |
(c) 6.30 gm |
(d) 1.35 gm |
Energy stored in electromagnetic oscillations is in the form of
|
(a) Electrical energy |
(b) Magnetic energy |
(c) Both (a) and (b) |
(d) None of these |
The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by 19%. By doing this the periodic time of the magnetometer will
|
(a) Increase by 19% |
(b) Decrease by 19% |
(c) Increase by 11% |
(d) Decrease by 21% |