## 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.

41. When water is boiling, it

• A. gets hotter
• B. increase is mass
• C. decreases in mass
• D. changes to steam

42. A mixture of blue and red pigment when illuminated by white light will appear

• A. green
• B. orange
• C. purple
• D. magenta

43. A siren having a ring of 200 hole makes 132 rev/min. A jet of air is directed on the set of holes. Calculate the frequency and wavelength in air of the note produced (take v = 350m/s)

• A. 0.875m
• B. 0.625m
• C. 0.335m
• D. 0.125m

44. A man on a bench will exert the greatest pressure on the bench when he

• A. lies flat on his back
• B. lies flat on his belly
• C. stands on both feet
• D. stands on the toes of one foot

45. Gases conduct electricity under

• A. high pressure & high voltage
• B. low pressure & low voltage
• C. normal pressure & low voltage
• D. low pressure & high voltage

46. Neutrons were discovered by

• B. Dalton
• D. Rutherford

47. The mass of a nucleus is the

• A. total number of its proton & neutrons
• B. number of its protons
• C. mass of its electrons
• D. total number of its protons & electrons

48.  Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.

• A. 0.71V
• B. 0.7V
• C. 0.82V
• D. 0.8V

49. An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5Ω. What is the power absorbed in the Coil?

• A. 5W
• B. 6W
• C. 7W
• D. 8W

50.  In semi-conductor, the carriers of current at room temperature are

• A. electrons only
• B. electrons and holes
• C. holes only
• D. electron and ions

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