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Tuesday, 28 July 2026
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Physics Past Questions and Answers

Jamb 2019 Physics Questions

Question 16:
During the transformation of matter from the solid to the liquid state, the heat supplied does not produce temperature increase because
  • A All the heat is used to break the bonds holding the molecules of the solid together
  • B The heat capacity has become very large as the substance melts
  • C The heat energy is quickly conducted away
  • D The heat gained is equal to the heat lost by the substance
View Answer & Explanation
Question 17:
In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of 3.6\(\Omega\) is connected to the other end of the wire. Determine the value of the unknown resistance
  • A 3.2\(\Omega\)
  • B 1.4\(\Omega\)
  • C 3.21\(\Omega\)
  • D 1.2\(\Omega\)
View Answer & Explanation
Question 18:
Electrons were discovered by
  • A Dalton
  • B James Charwick
  • C J.J. Thompson
  • D Niels Bohr
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Question 19:
Which of the following is/are the limitations to the Rutherford's atomic models?
I. It is applicable when energy is radiated as electrons are revolving
II. It is applicable when energy is radiated in a continuous mode
III. It is applicable to an atom with only one electron in the other shell
  • A I only
  • B II only
  • C I & II only
  • D I, II & III only
View Answer & Explanation
Question 20:
Which of the following equations is the correct definition of the reactance of an indicator L?
  • A Reactance = (Amplitude of voltage) \(\div\) (Amplitude of current)
  • B Reactance = (Amplitude of voltage) x (Amplitude of current)
  • C Reactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)
  • D Reactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)\(\frac{1}{2}\)
View Answer & Explanation