Telangana SSC Physical Sciences – Page 5

26. Moseley analysed ………….
A) band spectrum B) line spectrum
C) characteristic pattern of X- rays D) #-ray spectrum

27. This period is incomplete in the periodic table.
A) 2nd period B) 4th period C) 6th period D) 7th period

28. Modern periodic table has ………….
A) 7 periods, 18 groups B) 18 periods, 7 groups
C) 8 groups, 8 periods D) 18 periods, 8 groups

29. s – block elements will have the electronic configuration.
A) ns2 and np4 B) ns1 and ns2
C) np6 and nd4 D) ns2 and np6

30. This is a metal
A) Copper B) Chlorine C) Bromine D) Hydrogen

31. The name of 101st element is ………….
A) Indium B) Thallium C) Mendelevium D) Flarovium

32. Law of octaves holds good only up to
A) Magnesium B) Calcium C) Strontium D) Barium

33. The energy required to remove an electron from the outer most orbit of a neutral gaseous atom is
A) electronegativity B) electropositivity
C) enthalpy D) ionization energy

34. Number of elements present in 1st period
A) 2 B) 8 C) 18 D) 32

35. In the periodic table metals are on …………. side.
A) right B) left C) top D) bottom

36. …………. are anomalous pair of elements in Mendeleev’s periodic table.
A) Tellurium, Iodine B) Sodium, Lithium
C) Beryllium, Magnesium D) Copper, Zinc

37. Vertical columns of Mendeleev’s periodic table are called
A) Periods B) Transition elements
C) Block elements D) Groups

38. Electronegativity of an element is the average value of its ionization energy and
electron affinity. This was proposed by
A) Millikon B) Boyle C) Lavoisier D) Louis Proust

39. d – block elements (except Zn group) are known as
A) Inner transition elements B) Transition elements
C) Representative elements D) Actinoids

40. Both Lanthanides and Actinides are
A) d- block elements B) s- block elements
C) f- block elements D) p- block elements

41. ‘The physical and chemical properties of the elements are the periodic functions of their atomic numbers’. This is
A) Mendeleev’s periodic law B) Law of octaves
C) Modern periodic law D) Moseley’s periodic law

42. ‘The physical and chemical properties of the elements are the periodic functions of their electronic configuration’. This is
A) Modern periodic law B) Moseley’s periodic law
C) Mendeleev’s periodic law D) All the above

43. Electronegative values of elements ………… as we go down in a group.
A) Increase B) Decrease
C) Remain constant D) First increases and then decreases

44. Electronegative values of elements ………… as we go along a period from left to right.
A) Increase B) Decrease
C) Remain constant D) None of the above

45. Non – metals are generally ………. due to their smaller atomic radii.
A) Less electronegative B) not electronegative
C) More electronegative D) None of the above

46. Metals generally show ………. electronegative character.
A) more B) less C) constant D) zero

47. Electron gain enthalpy values ………. as we go down in a group.
A) increase B) decrease
C) remains constant D) may increase or decrease

48. 1 pico meter = ……….
A) 10-10 m B) 10-11 m C) 10-12 m D) 10-6 m

49. Atomic radius is measured in
A) cm B) m C) pm D) nm

50. The unit of ionization energy is …………
A) kJ mol-1 B) kJ C) J mol-1 D) kJ mol

Answers:

26-C; 27-D; 28-A; 29-B; 30-A; 31-C; 32-B; 33-D; 34-A; 35-B; 36-A; 37-D; 38-A; 39-B; 40-D; 41-D; 42-A; 43-B; 44-A; 45-C; 46-B; 47-B; 48-C; 49-C; 50-A.

Question: Are you familiar with musical notes?
Answer: In the Indian system of music, there are seven musical notes in a scale – sa, re ga, ma, pa, da, ni. In the west, they use the notations – do, re, mi, fa, so, la, ti. Naturally, there must be some repetition on notes. Every eighth note is similar to the first one and it is the first note of the next scale.

Question: Do you know what Mendeleev said about the melting point of eka Al?
Answer: ‘If I hold it in my hand, it will melt’. The melting point of Ga is 30.2°C and our body temperature is 37°C.

Question: How is Mendeleev honoured?
Answer: At the time when Mendeleev introduced his periodic table even electrons were not discovered. Even then the periodic table was able to provide a scientific base for the study of chemistry of elements. In his honour the 101th element was
named Mendelevium.

Question: Do you know how are the names of certain families of periodic table derived?
Answer: Alkali metal family: Aliquili = Plant ashes, Na, K etc.. were obtained from plant ash, Group I A elements are called Alkali metals family.

Chalcogen family: Chalcogenous = Ore product, as the elements in group 16 (VI A) form ores with metals. They are called as chalcogenous family.
Halogen family: Halos = Sea salt, Genus = Produced. As most of the elements in Group 17 (VII A) are obtained from nature as sea salt. They are called as halogen family.

Noble gases: As the elements of group 18 (VIII A) are chemically least active. They are called as noble gases. There outer shell electronic configuration are basis for octet rule.

10th Physical Sciences Bit Bank – Multiple Choice Questions

10th Physical Sciences Important Questions – Elements Chapter