Explanation:
A unitless quantity never has a non-zero dimension.
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Energy of electrons can be increased by allowing them
|
(a) To fall through electric potential |
(b) To move in high magnetic field |
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(c) To fall from great heights |
(d) To pass through lead blocks |
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4D, the power of a cutlens will be:
In a PN-junction diode not connected to any circuit
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(a) The potential is the same everywhere |
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(b) The P-type is a higher potential than the N-type side |
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(c) There is an electric field at the junction directed from the N- type side to the P- type side |
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(d) There is an electric field at the junction directed from the P-type side to the N-type side |
Dual nature of radiation is shown by
|
(a) Diffraction and reflection |
(b) Refraction and diffraction |
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(c) Photoelectric effect alone |
(d) Photoelectric effect and diffraction |
Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are
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(a) 2 ohm and 7 ohm |
(b) 3 ohm and 6 ohm |
(c) 3 ohm and 9 ohm |
(d) 5 ohm and 4 ohm |
The V-i graph for a conductor at temperature 
and 
are as shown in the figure. (
is proportional to
|
(a) cos2θ |
(b) sin θ |
(c) cot 2θ |
(d) tan θ |