10th Class Physical Sciences – Page 13

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.

1. Number of elements present in period – 2 of the long form of periodic table.
A) 2 B) 8 C) 18 D) 32

2. Nitrogen (Z = 7) is the element of group V of the periodic table. Which of the
following is the atomic number of the next element in the group?
A) 9 B) 14 C) 15 D) 17

3. Electron configuration of an atom is 2, 8, 7 to which of the following elements
would it be chemically similar?
A) Nitrogen (Z = 7) B) Fluorine (Z = 9)
C) Phosphorous (Z = 15) D) Argon (Z = 18)

4. Which of the following is the most active metal?
A) Lithium B) Sodium C) Potassium D) Rubidium

5. This is not a Dobereiner’s triad.
A) Li, Na, K B) Mn, Cr, Fe C) Cu, Hg, Mg D) S, Se, Te

6. This is a metalloid
A) Copper B) Silicon C) Gold D) Aluminium

7. Newlands periodic table is restricted to only ……….. elements.
A) 46 B) 56 C) 66 D) 36

8. Number of groups in Mendeleev’s periodic table.
A) 6 B) 8 C) 18 D) 32

9. Sub-group I A elements of Mendeleev’s periodic table are called
A) Alkali metals B) Alkali earth metals C) Halogens D) Noble gases

10. Mendeleev’s periodic table has ……….. periods.
A) 8 B) 9 C) 7 D) 14

11. At the time of Robert Boyle, number of elements known are
A) 63 B) 115 C) 91 D) 13

12. By now, including synthetic elements, there are more than ………….. elements.
A) 63 B) 91 C) 115 D) 13

13. Scientist who stated that hydrogen atom is the building material and atoms of all other elements are simply due to the combination of number of hydrogen atoms.
A) Robert Boyle B) Lavoisier
C) Dobereiner D) Joseph Louis Proust

14. Chemist who established the law of triads
A) Dobereiner B) Lavoisier C) Newlands D) Robert Boyle

15. Scientist who was first to assign atomic numbers to elements was
A) Newlands B) Moseley C) Dobereiner D) Mendeleev

16. The scientist who stated the periodic law as ‘the physical and chemical properties of the elements are periodic function of their atomic weights’ was
A) Moseley B) Mendeleev C) Robert Boyle D) Newlands

17. Eka-boron was later found to be
A) Scandium B) Gallium C) Germanium D) Silver

18. Eka-aluminium was later found to be
A) Aluminium B) Scandium C) Germanium D) Gallium

19. Eka- silicon was later found to be
A) Silicon B) Aluminium C) Germanium D) Boron

20. All elements are gases in this group
A) 0 B) I C) IV A D) VII A

21. The elements given below belong to the same period
A) C, N, O B) Ca, In, Sn C) Be, Fe, Co D) Al, Pb, Bi

22. Actinoids belong to ………….. period.
A) 2 B) 7 C) 5 D) 4

23. Group III A (13) elements are called as
A) Halogen family B) Nitrogen family
C) Boron family D) Alkali metals family

24. The inner-transition elements are …………. elements.
A) s-block B) d-block C) p- block D) f-block

25. Ionization increases with ………….
A) more screening effect B) more nuclear charge
C) less penetration power D) more atomic radius

Answers:

1-B; 2-C; 3-B; 4-D; 5-C; 6-B; 7-B; 8-B; 9-A; 10-C; 11-D; 12-C; 13-D; 14-A; 15-A; 16-B; 17-A; 18-D; 19-C; 20-A; ; 21-A; 22-B; 23-C; 24-D; 25-B.

10th Physical Sciences Bit Bank – Multiple Choice Questions

10th Physical Sciences Objective Multiple Choice Questions