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 281: The image in a pin-hole camera is Options:
  A) errect and formed by refraction through a lens
  B) virtual and formed by dispersion
  C) erect and gets sharper as the hole becomes larger
  D) inverted and formed by the light from each point travelling in a straight line
  Show Answer
  The correct answer is D .
• Question 282:

  Gases conduct electricity under

  Options:
  A) high pressure and high voltage
  B) low pressure and low voltage
  C) normal pressure and low voltage
  D) low pressure and high voltage
  Show Answer
  The correct answer is D .
• Question 283:

  Which of the following statements regarding the application of electrical conduction via gases is/are correct?
  Electrical conduction in gas is applied in:
  (i) The identification of gases
  (ii) Lighting/fluorescent tubes
  (iii) Photocells
  (iv) Cathode ray oscilloscope/T.V. tubes

  Options:
  A) (i), (iii) and (iv) only
  B) (i), (ii) and (iv) only
  C) (ii), (iii) and (iv) only
  D) (i), (ii) and (iii) only
  Show Answer
  The correct answer is B .
• Question 284:

  Natural radioactivity consists of the emission of

  Options:
  A) α- particles and β-rays
  B) α- particles and X-rays
  C) α- particles, β - rays and g-rays
  D) γ- rays and X-rays
  Show Answer
  The correct answer is C .
• Question 285: 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 286:

  

  The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?

  Options:
  A) 28.0
  B) 48.0N
  C) 233.0N
  D) 50.0N
  Show Answer
  The correct answer is D .
• Question 287: A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called Options:
  A) condensation
  B) sublimation
  C) regelation
  D) fusion
  Show Answer
  The correct answer is C .
• Question 288:

  In order to view the sun, the most suitable instrument to use is?

  Options:
  A) helioscope
  B) telescope
  C) stroboscope
  D) sun meter
  Show Answer
  The correct answer is A .
• Question 289:

  Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?

  Options:
  A) formation of hydrogen bubbles on the electrode
  B) increase in the resistance of the cell
  C) local action
  D) polarization
  Show Answer
  The correct answer is C .
• Question 290:

  A train of mass 1600 kg attains a speed of 25 ms${}^{-1}$ in 20 seconds. The power developed in the engine is?

  Options:
  A) 2.5 KW
  B) 80 KW
  C) 25 KW
  D) 50 KW
  Show Answer
  The correct answer is D .