## Physics 2019 Past Questions | JAMB

Study the following Physics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

11. Electrons were discovered by

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

12. 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

13. Which of the following equations is the correct definition of the reactance of an indicator L?

• A. Reactance = (Amplitude of voltage) $÷$ (Amplitude of current)
• B. Reactance = (Amplitude of voltage) x (Amplitude of current)
• C. Reactance = (Amplitude of current)2$÷$ (Amplitude of voltage)
• D. Reactance = (Amplitude of current)${}^{2}$$÷$ (Amplitude of voltage)1/2

14. Ripple in a power supply unit is caused by

• A. using an alternating current source
• B. forward voltage drop
• D. using a zener diode

15. When th temperature of a liquid is increased, its surface tension

• A. increases
• B. decreases
• C. remain constant
• D. increases then decreases

16. The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

• A. 6.5 cm
• B. 7.5 cm
• C. 8.5 cm
• D. 4.5 cm

17. A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?

• A. 180 ${}^{o}$
• B. 90 ${}^{o}$
• C. 0 ${}^{o}$
• D. 60 ${}^{o}$

18. The pin-hole camera produces a less sharply defined image when the

• A. pin-hole is larger
• B. illumination is less
• C. screen is further from the pin-hole
• D. object is further from the pin-hole

19. A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field

A. 0.46N

B. 0.35N

C. 0.36N

D. 0.24N

20.  The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

• A. 400
• B. 300
• C. 200
• D. 150

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