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6
14 N + 4 He → 17 O + X
7 2 8


In the equation above, the particles X is?

  • A. a proton
  • B. a neutron
  • C. an α - particle
  • D. a β - particle
View Answer & Discuss (1) JAMB 2008
7

Which of the following is used a nuclear reactor to slow down fast moving neutrons?

  • A. Carbondioxide gas
  • B. Liquid sodium metal
  • C. Concrete shield
  • D. Graphite rods
  • E. Boron rods
View Answer & Discuss (6) WAEC 1993
8

Which of the following features is NOT a characteristic of natural radioactivity?

  • A. Radioactivity is a nuclear phenomenon
  • B. Radioactivity is exhibited only by elements of mass number greater than 206
  • C. The radioactivity of an element is affected by electric and magnetic fields in the surroundings
  • D. Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
  • E. The radioactive element is transformed into a new element
View Answer & Discuss (11) JAMB 1985
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
9

Which of the following are true of atom?

  • A. atoms are indestructible
  • B. all atoms of a pure substance, or elements are identical
  • C. atoms of different substance have different weights
  • D. all of the above
  • E. A and B only
View Answer & Discuss (16) JAMB 1980
10

Which of the following statements on the use of X-rays is incorrect? X-rays are used

  • A. in hospitals to obtain photogaphs of tissues and bones in the body
  • B. for the treatment of malignant growths like cancer cells
  • C. in detecting fingerprints
  • D. to reveal hidden flaws in metal castings and welded joints
  • E. to detect alternations which have been made to works of art
View Answer & Discuss (15) JAMB 1980
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208