CO2 laser uses
microwaves
infra red
ultra violet
visible light
C.
ultra violet
One has to use higher energy to produce radiation in the visible region. In CO2 laser two electrodes produce discharge which is used. Therefore ultraviolet rays are used to produce light in any lower energy region.
In an AC circuit the potential differences across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference of the source is
20.0 V
25.6 V
31.9 V
53.5 V
The focal length of the objective and eye lenses of a microscope are 1.6 cm and 2.5 cm respectively. The distance between the two lenses is 21. 7 cm. If the final image is formed at infinity. What is the linear magnification?
11
110
1.1
44
Assertion: : A current continues to follow in superconducting coil even after switch is off.
Reason: Superconducting coils show Meissner effect.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: Dipole oscillations produce electromagnetic waves.
Reason: Accelerated charge produces electromagnetic waves.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Asserion: : NAND is a universal gate.
Reason: It can be used to describe all other logic gates.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: In a cavity within a conductor, the electric field is zero.
Reason: Charges in a conductor reside only at its surface.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: Ferro magnetic substances become paramagnetic above Curie temperature.
Reason: Domains are destroyed at high temperature.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: Ohm's law is applicable for all conducting elements.
Reason: Ohm's law is a fundamental law.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false