Jamb Physics 2019 Past Questions and Answers

Question 16:

• JAMB 2019

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

Question 17:

• JAMB 2019

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\(\Omega\)

Question 18:

• JAMB 2019

Electrons were discovered by

A. Dalton
B. James Charwick
C. J.J. Thompson
D. Niels Bohr

Question 19:

• JAMB 2019

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

Question 20:

• JAMB 2019

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)\(\frac{1}{2}\)