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 1721:

  

  The effect of closing the key K in the circuit shown above would be to

  Options:
  A) increase the current by 0.6A
  B) reduce the current by 0.6A
  C) increase the current by 0.4A
  D) keep the current unchanged
  Show Answer
  The correct answer is C .
• Question 1722: The instrument to measure the relative density of light is Options:
  A) thermometer
  B) hydrometer
  C) spring balance
  D) beaker
  Show Answer
  The correct answer is B .
• Question 1723: At what respective values of X, Y and Z would the unit of force, the newton, be dimensionally equivalent to M^xL^yT^z? Options:
  A) -1, 1, 2
  B) 1, 1, -2
  C) 1, -1, 2
  D) -1, 1, -2
  Show Answer
  The correct answer is B .
• Question 1724:

  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

  Options:
  A) 6.5 cm
  B) 7.5 cm
  C) 8.5 cm
  D) 4.5 cm
  Show Answer
  The correct answer is B .
• Question 1725: Two divers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P₁ while the pressure on H is P₂. If the atmospheric pressure is equivalent to 10m of water, then the value of $\frac{p_2}{p_1}$ is Options:
  A) 0.50
  B) 0.60
  C) 1.67
  D) 2.00
  E) 3.0
  Show Answer
  The correct answer is D .
• Question 1726:

  A source of sound produces waves in air of wavelength1.65m. If the speed of soundin air is 330ms${}^{-1}$, the period of vibration in air is?

  Options:
  A) 200
  B) 0.005
  C) 0.5
  D) 0.02
  Show Answer
  The correct answer is B .
• Question 1727: Which of the following statements is CORRECT? i. the mass number is equal to the total number of protons and electrons in an atom. ii. the atomic number is equal to the number of protons in an atom. iii. the number of electrons in an atom is equal to the total number of protons and neutrons in the nucleus. Options:
  A) i only
  B) ii only
  C) iii only
  D) i and ii only
  E) ii and iii only
  Show Answer
  The correct answer is B .
• Question 1728:

  I. Increase the melting point of the liquid.

  II. Increase the boiling point of the liquid.

  III. Decrease the melting point of the liquid.

  IV. Decrease the boiling point of the liquid.

  Which of the statement above about the effect on increase in pressure in a liquid are correct?

  Options:
  A) I and II only
  B) I and III only
  C) II and III only
  D) III and IV only
  Show Answer
  The correct answer is C .
• Question 1729:

  

  What is the reading of the vernier scale above?

  Options:
  A) 1.88cm
  B) 1.80cm
  C) 1.28cm
  D) 1.97cm
  Show Answer
  The correct answer is A .
• Question 1730:

  If the attraction of the sun is suddenly ceased, the earth would continue to move in a straight line making a tangent with the original orbit. This statement is derived from Neutron's

  Options:
  A) First law of motion
  B) Second law of motion
  C) Third law of motion
  D) Law of universal gravitation
  Show Answer
  The correct answer is A .