In hydrogen atom which quantity is integral multiple of
|
(a) Angular momentum |
(b) Angular velocity |
|
(c) Angular acceleration |
(d) Momentum |
In hydrogen atom which quantity is integral multiple of
|
(a) Angular momentum |
(b) Angular velocity |
|
(c) Angular acceleration |
(d) Momentum |
(a) Angular momentum
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An object is placed first at infinity and then at 20 cm from the object side focal plane of the convex lens. The two images thus formed are 5 cm apart. The focal length of the lens is
|
(a) 5 cm |
(b) 10 cm |
(c) 15 cm |
(d) 20 cm |
If T is the half life of a radioactive material, then the fraction that would remain after a time
is
|
(a) |
(b) |
(c) |
(d) |
When a radioactive substance emits an a -particle, its position in the periodic table is lowered by
|
(a) One place |
(b) Two places |
(c) Three places |
(d) Four places |
A wire is broken in four equal parts. A packet is formed by keeping the four wires together. The resistance of the packet in comparison to the resistance of the wire will be
|
(a) Equal |
(b) One fourth |
(c) One eight |
(d) |
A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal length will
|
(a) Decrease and change sign |
|
(b) Increase and change sign |
|
(c) Decrease and remain of the same sign |
|
(d) Increase and remain of the same sign |
The resistance of a galvanometer is 90 ohms. If only 10 percent of the main current may flow through the galvanometer, in which way and of what value, a resistor is to be used
|
(a) 10 ohms in series |
(b) 10 ohms in parallel |
|
(c) 810 ohms in series |
(d) 810 ohms in parallel |