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: A 120 V, 60 W lamp is to be operated on 220 V a.c. the supply mains. calculate the values of non-inductive resistance that would be required to ensure that the lamp is run on current value. Options:
  A) 100 Ω
  B) 200 Ω
  C) 300 Ω
  D) 500 Ω
  Show Answer
  The correct answer is B .
• Question 1722:

  The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

  Options:
  A) $\frac{m{v}^2}{r}$
  B) $\frac{m{r}^2}{x}$
  C) $\frac{mr}{v}$
  D) $\frac{mv}{r^2}$
  Show Answer
  The correct answer is A .
• Question 1723: Two cells each of e.m.f. 1.5V and an internal resistance 2$\mathrm{\Omega }$ are connected in parallel. Calculate the current flowing when the cells are connected to a 1$\mathrm{\Omega }$ resistor Options:
  A) 0.75$\mathrm{\Omega }$
  B) 1.5$\mathrm{\Omega }$
  C) 0.5$\mathrm{\Omega }$
  D) 1.0$\mathrm{\Omega }$
  E) 0.6$\mathrm{\Omega }$
  Show Answer
  The correct answer is A .
• Question 1724: In the hare's apparatus, water rises to a height of 26.5 cm in one limb. if a liquid rises to a height of 20.4 cm in the other limb, what is the relative density of the liquid? Options:
  A) 0.8
  B) 1.1
  C) 1.2
  D) 1.3
  Show Answer
  The correct answer is D .
• Question 1725: What is the inductance (L) of an inductor whose reactance is 1Ω at 50/ π hertz (H)? Options:
  A) 100 H
  B) 0.01H
  C) 10H
  D) 1H
  Show Answer
  The correct answer is B .
• Question 1726:
  

  Name the type of equilibrium for each position of the ball

  Options:
  A) A - unstable, B - neutral, C - stable
  B) A - stable, B - neutral, C - unstable
  C) A - stable, B - unstable, C - neutral
  D) A - unstable, B - stable, C - neutral
  Show Answer
  The correct answer is D .
• Question 1727: Which of the following are True for $\alpha$-decay. i. mass number, decrease by four. ii. Atomic number decreases by two. iii. mass number does not change. Options:
  A) i and ii only
  B) ii and iii only
  C) i and iii only
  D) i, ii, and iii only
  Show Answer
  The correct answer is A .
• Question 1728: A radioactive substance has a half-life of 20 days what fraction the original radiation nuclei will remain after 80 days? Options:
  A) (1)/32
  B) (1)/16
  C) (1)/ 8
  D) (1)/4
  Show Answer
  The correct answer is B .
• Question 1729:

  Which of the following statements is correct about the angle of dip at various points on Earth?

  Options:
  A) The angle of dip is zero at the equator and 90 degrees at the magnetic poles.
  B) The angle of dip is greater at higher altitudes than at lower altitudes
  C) The angle of dip is positive in the northern hemisphere and negative in the southern hemisphere.
  D) The angle of dip is constant at all points on Earth
  Show Answer
  The correct answer is A .
• Question 1730: Which type of motion do the wheels of a moving car undergo? Options:
  A) Vibratory and translational motion
  B) Random and translational motion
  C) Rotational mand oscillatory motion
  D) Translational and rotational motion
  Show Answer
  The correct answer is D .