Search SchoolNGR

Thursday, 29 October 2026
Register . Login

Physics Past Questions and Answers

Jamb 1980 Physics Questions

Question 31:
The best material for the core of the primary and secondary coils of an induction coil is
  • A Copper, because it has a good conductor of electricity
  • B Steel, because it becomes magnetic and retains its magnetism for a long time
  • C Rubber, because it is a good insulator and the user is prevented from shock
  • D Soft iron, because it becomes magnetic but easily loses its magnetism
  • E Glass, because it is transparent
View Answer & Explanation
Question 32:
Which of the following radiations cannot be deflected by a magnetic field?
  • A \(\alpha\)
  • B \(\beta\)
  • C \(\gamma\)
  • D \(\beta\) and \(\gamma\)
  • E None of them
View Answer & Explanation
Question 33:
Which of the following elements is the best absorber of X-rays?
  • A Hydrogen
  • B Oxygen
  • C Calcium
  • D Copper
  • E Lead
View Answer & Explanation
Question 34:
a calorimeter of thermal capacity 80j contains 20g of water at 25oC. Water at 100oC is added so that the final temperature of the set-ups is 50oC. The amount of water added is (Heat capacity of water = 4.18J/g/oC)
  • A 20g
  • B 25g
  • C 45g
  • D 50g
  • E 100g
View Answer & Explanation
Question 35:
the ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is
  • A 3
  • B 1.5
  • C 1.32
  • D 1
  • E 0.67
View Answer & Explanation