MCQ

Consider the following two statements:

  1. Line spectra contain information about atoms.
  2. Band spectra contain information about molecules.
    • A
      Both A and B are wrong
    • B
      A is correct but B is wrong.
    • C
      B is correct but A is wrong
    • D
      Both A and B are correct.

    Answer

    1. Both A and B are correct.

    Explanation:

    Because line spectra contain wavelengths that are absorbed by atoms and band spectra contain bunch wavelengths that are absorbed by molecules, both statements are correct.

    Need a full question paper?

    Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

    Start Generating Free

    Explore more

    Similar questions

    A ray of light passes through four transparent media with refractive indices  and  as shown in the figure.  The surfaces of all media are parallel.  If the emergent ray CD is parallel to the incident ray AB, we must have

    (a)  

    (b)  

    (c)  

    (d)  

    Gold-leaf electroscope can be used _______?

    With a change of load resistance of a triode, used as an amplifier, from 50 kilo ohms to 100 kilo ohms, its voltage amplification changes from 25 to 30. Plate resistance of the triode is

    (a) 25 kW

    (b) 75 kW

    (c) 7.5 kW

    (d) 2.5 kW

    Television signals on earth cannot be received at distances greater than 100 km from the transmission station. The reason behind this is that

    (a) The receiver antenna is unable to detect the signal at a distance greater than 100 km

    (b) The TV programme consists of both audio and video signals

    (c) The TV signals are less powerful than radio signals

    (d) The surface of earth is curved like a sphere

    Two wires A and B, having identical geometrical construction, are stretched from their natural length by small but equal amount. The Young's modulus of the wires are YA and YB whereas the densities are $\rho_\text{A}>\rho_{\text{B}^+}$  It is given that YA > YB and $\rho_\text{A}>\rho_{\text{B}^+}.$ A transverse signal started at one end takes a time t1 to reach the other end for A and t2 for B.
    1. t1 < t2
    2. t1 = t2
    3. t1 > t2
    4. The information is insufficient to find the relation betwee t1 and t2.

    The grid voltage of any triode valve is changed from –1 volt to – 3 volt and the mutual conductance is 3  mho. The change in plate circuit current will be

    (a) 0.8 mA

    (b) 0.6 mA

    (c) 0.4 mA

    (d) 1 mA

    Using visible light what is the shortest wavelength which can be measured?

    An electric dipole placed in a non-uniform electric field can experience:

    When the current i is flowing through a conductor, the drift velocity is v. If  2i  current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be

    (a) v/4

    (b) v/2

    (c) v  

    (d) 4v

    A non.monochromatic light is used in an experiment on photoelectric effect. The stopping potential: