41. X-rays are produced when cathode rays strike heavy___?
A. Cathode
B. Anode
C. Metal Anode
D. Metal Cathode
42. Chlorophyll a contains __ functional group.
A. Carbonyl Group
B. Methylene Group
C. Methyl Group
D. None of these
43. Max Plank proposed Quantum Theory in__.
A.1901
B.1902
C.1903
D.1900
44. The four rings of the Chlorophyll are collectively called__.
A. Pyrole rings
B. Porphyrine rings
C. Pyramidine
D. None of these
45.The central Ion in Chlorophyll is
A. Cu
B. Mg
C. Fe
D. Cl
46. The splitting of spectral line in magnetic field is called
A. Stark effect
B. Zeeman effect
C. Pauli exclusion principle
D. Aufbau Principle
Feedback: The Zeeman effect (/ˈzeɪmən/; Dutch pronunciation: [ˈzeːmɑn]) is the effect of splitting of a spectral line into several components in the presence of a static magnetic field. It is named after the Dutch physicist Pieter Zeeman, who discovered it in 1896 and received a Nobel prize for this discovery.
47. Protons were discovered by Eugen Goldstein in
A.1888
B.1886
C.1882
D. None of these
48.There are _ types of spectrum.
A.1
B.2
C.3
D.4
Feedback: Types of Atomic Spectrum (1) Emission spectrum: Spectrum produced by the emitted radiation is known as emission spectrum. This spectrum corresponds to the radiation emitted (energy evolved) when an excited electron returns back to the ground state.
(i) Continuous spectrum: When sunlight is passed through a prism, it gets dispersed into continuous bands of different colours. If the light of an incandescent object resolved through prism or spectroscope, it also gives continuous spectrum of colors.
(ii) Line spectrum: If the radiation’s obtained by the excitation of a substance are analyzed with help of a spectroscope a series of thin bright lines of specific colors are obtained. There is dark space in between two consecutive lines. This type of spectrum is called line spectrum or atomic spectrum..
(2) Absorption spectrum: Spectrum produced by the absorbed radiations is called absorption spectrum.
(3) Hydrogen spectrum: Hydrogen spectrum is an example of line emission spectrum or atomic emission spectrum.
(a) When an electric discharge is passed through hydrogen gas at low pressure, a bluish light is emitted.
(b) This light shows discontinuous line spectrum of several isolated sharp lines through prism.
(c) All these lines of H-spectrum have Lyman, Balmer, Paschen, Barckett, Pfund and Humphrey series. These spectral series were named by the name of scientist discovered them.
(d) To evaluate wavelength of various H-lines Ritz introduced the following expression,
V– = 1/λ = V/C = [1/n12 – 1n22 ]
Where R is universal constant known as Rydberg’s constant its value is 109, 678 cm-1.
49. Line spectrum is also called as
A. Helium spectrum
B. Sodium spectrum
C Both A and B
D. Atomic spectrum
50. The proton is __ times heavier than electron.
A.1836
B.1835
C.1935
D.1936
Feedback: The mass of the proton is almost 1836 times heavier than that of an electron.
51. ___ named cathode rays as electrons.
A. J.J Thomsan
B. Eugen Goldstein
C. G.J Stoney
D. Williams Crookes
Feedback: J.J. Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called “electrons.
52. Neutron were discovered by James Chadwick in
A.1930
B.1931
C.1932
D.1933
53. Neutrons were discovered by James Chadwick in__.
A.1930
B.1931
C.1932
D.1933
54. proton were discovered by Eugene Goldstein (1850–1930) In__.
A.1686
B.1786
C.1886
D.1896
55. inflammation of the tongue is called
A. Gastritis
B. Glossitis
C. Hepatitis
D. Enteritis
Feedback: Glossitis is a problem in which the tongue is swollen and inflamed. This often makes the surface of the tongue appear smooth. Geographic tongue is a type of glossitis.
56. Nucleus was discovered by Robert Brown in__
A. 1631
B. 1831
C. 1883
D.1931
57. The nuclear envelope composed of___ membranes?
A. Single membrane
B. Double membrane
C. No membrane
D. Both A and B
Feedback: The nuclear envelope is a double membrane composed of an outer and an inner phospholipid bilayer. The thin space between the two layers connects with the lumen of the rough endoplasmic reticulum (RER), and the outer layer is an extension of the outer face of the RER.
58. Eukaryotic cells have ribosomes:
A) 70S
B )80S
C) 100S
D) Both a & b
Feedback: Eukaryotes have 80S ribosomes located in their cytosol, each consisting of a small (40S) and large (60S) subunit. Their 40S subunit has an 18S RNA (1900 nucleotides) and 33 proteins.
59. In which part of the respiratory system, gaseous exchange takes place?
A Alveoli
B Pharynx
C Trachea
D Larynx
60. Which of the following are parts of the human respiratory system?
A Diaphragm
B Trachea
C The lungs
D All of the above