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 211: Eight alpha decays and six beta decays are necessary before an atom of 2 ${}_{92}^{238}U$ achieves stability. The final product in the chain has an atomic number of Options:
  A) 70
  B) 78
  C) 82
  D) 90
  Show Answer
  The correct answer is C .
• Question 212:

  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?

  Options:
  A) 180${}^o$
  B) 90${}^o$
  C) 0${}^o$
  D) 60${}^o$
  Show Answer
  The correct answer is C .
• Question 213: If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys Options:
  A) Graham's Law
  B) Boyle's Law
  C) Pressure law
  D) Charles Law
  E) No Correct Option
  Show Answer
  The correct answer is B .
• Question 214:

  When the breaks in a car are applied, the frictional force on the tyresis?

  Options:
  A) a disadvantage because it is in the direction of the motion of the car
  B) a disadvantage because it is in the opposite direction of the motion of the car
  C) an advantage because it is in the direction of the motion of the car
  D) an advantage because it is in the opposite direction of the motion of the car
  Show Answer
  The correct answer is D .
• Question 215: A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms^-2, the power expended is Options:
  A) 100W
  B) 200W
  C) 250W
  D) 400W
  E) 500W
  Show Answer
  The correct answer is E .
• Question 216:

  A 40KW electric cable was uses to transmit electricity through a resistor of resistance 2.00Ω at 800V. The power loss as internal energy is

  Options:
  A) 4.0 x 10²W
  B) 5.0 x 10²W
  C) 4.0 x 10³W
  D) 5.0 x 10³W
  Show Answer
  The correct answer is D .
• Question 217: The ice and steam points of mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to 3cm and 19cm lengths of the mercury thread when the length is 12cm, the temperature is Options:
  A) 32^oC
  B) 48^oC
  C) 56^oC
  D) 65^oC
  E) 75^oC
  Show Answer
  The correct answer is C .
• Question 218: When 100g of liquids L₁ at 78^oC was mixed with Xg of liquid L₂ at 50^oC, the final temperature was 60^oC. Given that the specific heat capacity of L₂is half that of L₁, find x Options:
  A) 50g
  B) 100g
  C) 150g
  D) 200g
  Show Answer
  The correct answer is C .
• Question 219:

  

  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 220: The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that on the moon. The ratio of the mass of the moon to that of the earth is Options:
  A) 1:80
  B) 1:320
  C) 1:1280
  D) 1:4
  Show Answer
  The correct answer is A .