Physics Exam Past Questions and Answers | JAMB, WAEC and NECO

Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.

• Question 2191:

  Electrons were discovered by

  Options:
  A) Dalton
  B) James Charwick
  C) J.J. Thompson
  D) Niels Bohr
  Show Answer
  The correct answer is C .
• Question 2192: A body is launched from the earth’s surface, of radius R, so that it just escapes from the gravitational influence of the earth; If the gravitational constant is G and the mass of the earth is M, what is the escape velocity of the boby. Options:
  A) $\sqrt{2GM}$ ÷ R
  B) $\frac{\sqrt{2GM}}{R}$
  C) $\frac{\sqrt{2G}}{MR}$
  D) $\sqrt{2GMR}$
  E) $\frac{\sqrt{R}}{2GM}$
  Show Answer
  The correct answer is B .
• Question 2193: An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is Options:
  A) 80.0W
  B) 40.0W
  C) 10.0W
  D) 0.1W
  Show Answer
  The correct answer is A .
• Question 2194: An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the position and nature of the image formed? Options:
  A) 30cm and virtual
  B) 6cm and real
  C) 6cm and virtual
  D) 30cm and real
  Show Answer
  The correct answer is A .
• Question 2195:

  A string is sustaining a stationary wave when

  Options:
  A) the frequency of the wave is not proportional to the wavelength of the wave
  B) the amplitude of vibration is always zero
  C) two equal waves are travelling in opposite directions
  D) the waves are longitudinal
  E) the frequency is directly proportional to the length of the string
  Show Answer
  The correct answer is C .
• Question 2196: A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosine. The ratio of density of the solid to that of the kerosine is Options:
  A) 12
  B) 3
  C) 2
  D) $\frac{3}{2}$
  E) $\frac{5}{4}$
  Show Answer
  The correct answer is B .
• Question 2197: Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then Options:
  A) A and B are equal
  B) A is greater than B
  C) the angle between A and B is 0°
  D) the angle between A and B is 90°
  E) the angle between A and B is 180°
  Show Answer
  The correct answer is E .
• Question 2198: Natural radioactivity consists of the emission of Options:
  A) $\alpha$ -particle and $\beta$ rays
  B) $\alpha$ -particle and X-rays
  C) $\gamma$-rays and X-rays
  D) $\alpha$-particle, $\beta$ rays and $\gamma$-rays
  E) $\alpha$ -particle, $\beta$ rays, $\gamma$-rays and X-rays
  Show Answer
  The correct answer is D .
• Question 2199:

  The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on the thimble of the screw gauge.

  What is the smallest length that can be measured with this instrument?

  Options:
  A) 0.05cm
  B) 0.01cm
  C) 0.005cm
  D) 0.001cm
  E) 0.0001cm
  Show Answer
  The correct answer is D .
• Question 2200: The velocity of a sound wave at 27^oC is 360ms^-1. Its velocity at 127^oC is Options:
  A) 120√3 ms^-1
  B) 240 ms^-1
  C) 240√3 ms^-1
  D) 720√3 ms^-1
  Show Answer
  The correct answer is C .