Physics Past Questions and Answers 2021

English Past Question 2021

Physics Past Questions and Answers 2021 – Physics is studied by science students and is concerned with the nature and properties of matter and energy. Physics topics include mechanics, heat, light and radiation, sound, electricity, magnetism, and the structure of atoms.

Study Physics Past Questions and Answers 2021 for JAMB, WAEC, NECO, and Post UTME. Prepare yourself with official past questions and answers for your upcoming examinations. This is the surest way to pass the examination with flying colors.

Physics Past Questions and Answers 2021

Why you need Physics Past Questions and Answers 2021

The more you practice with past exam questions, the more you sharpen your skills. These papers help you recall what you have been learning in class. Besides, it allows you to apply the concepts you have mastered during your studies.

Therefore, past exam papers are a perfect option for your upcoming exam revision.

Physics Past Questions and Answers 2021 Pattern

We have made it simple for you. We bring all the questions which are usually in objective format since it is now in CBT. We have put them together but we indicate the specific years for every question and the correct answers to save you time. All you need to do is to devote quality time to studying the Past Questions.

Sample of Physics Past Questions and Answers 2021

16. If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?
  • A. 24 years
  • B. 20 years
  • C. 10 years
  • D. 2 years

ANS: B

17. A certain radioactive source emits radiation that was found to be deflected by both magnetic and electric fields. The radiation is?
  • A. beta rays
  • B. gamma rays
  • C. x-rays
  • D. ultra-violet rays

ANS: A

18. The inner diameter of a test tube can be measured accurately using a?
  • A. micrometer screw gauge
  • B. pair of dividers
  • C. meter rule
  • D. pair of vernier calipers

ANS: D

19. Two bodies have masses in the ratio 3:1. They experience forces which impart to them, acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced
  • A. 1:4
  • B. 2:1
  • C. 2:3
  • D. 2:5

ANS: C

20. Particles of mass 102−2kg are fixed to the tip of a fan blade which rotates with an angular velocity of 100rad1−1. If the radius of the blade is 0.2m, the centripetal force is?
  • A. 2N
  • B. 20N
  • C. 200N
  • D. 400N

ANS: B

21. A lead bullet of mass 0.05kg is fired with a velocity of 200ms1−1 into a block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is?
  • A. 50J
  • B. 100J
  • C. 150J
  • D. 200J

ANS: A

22. A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms1−1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is? (Take g = 10ms2−2)
  • A. 5J
  • B. 10J
  • C. 15J
  • D. 20J

ANS: C

23. A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?
  • A. 1.25 x 1044W
  • B. 2.50x 1044W
  • C. 1.25 x 1066W
  • D. 2.50 x 1066W

ANS: B

24. When the breaks in a car are applied, the frictional force on the tires is?
  • 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

ANS: D

25. If the stress on a wire is 1077NM2−2 and the wire is stretched from its original length of 10.00m to 10.05m. The Young’s modulus of the wire is?
  • A. 5.0 x 104−4Nm2−2
  • B. 5.0 x 105−5Nm2−2
  • C. 2.0 x 108−8Nm2−2
  • D. 2.0 x 1099Nm2−2

ANS: D

26. A solid weighs 10.00N in air, 6N when forcefully immersed in water, and 7.0N when fully immersed in a liquid, X. Calculate the relative density of the liquid X.
  • A. 5353
  • B. 4343
  • C. 3434
  • D. 710710

ANS: C

27. When the temperature of a liquid increases, its surface tension
  • A. decreases
  • B. increases
  • C. remains constant
  • D. increases then decreases

ANS: A

28. A gas at a volume of V00 in a container at pressure p00 is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?
  • A. p05�05
  • B. 4p054�05
  • C. p00
  • D. 5P00

ANS: D

29. A piece of substance of specific heat capacity 450Jkg1−1k11 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms2−2]
  • A. 2929ºC
  • B. 4949ºC
  • C. 9292ºC
  • D. 9494ºC

ANS: B

30. I. A liquid boils when its saturated vapor pressure is equal to the external pressure

II. Dissolved substances in pure water lead to an increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decreases the boiling point 

Which of the above combinations are peculiarities of the boiling point of a liquid?

  • A. I, II, and III only
  • B. I, II, III, and IV
  • C. I, II, and IV
  • D. II, III, and IV

ANS: A

31. The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20º and 80ºC respectively is?
  • A. 3.0 x 1022km1−1
  • B. 3.0 x 1033km1−1
  • C. 5.0 x 1033km1−1
  • D. 3.0 x 1044km1−1

ANS: B

32. Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss (specific heat capacity of copper = 400Jkg11k1−1, latent heat of fusion of ice = 3.3 x 1055Jkg1−1)
  • A. 833833kg
  • B. 3.3803.380kg
  • C. 80338033kg
  • D. 3.383.38kg

ANS: A

33. The equation of a wave traveling along the positive x-direction is given by; y = 0.25 x 103−3 sin (500t – 0.025x). Determine the angular velocity of the wave motion. 
  • A. 0.25 x 103−3rads1−1
  • B. 0.25 x 101−1rads1−1
  • C. 5.00 x 1022rads1−1
  • D. 2.50 x 1033rads1−1

ANS: C

34. If a sound wave goes from a cold air region to a hot air region, its wavelength will?
  • A. increase
  • B. decrease
  • C. decrease then increase
  • D. Remain constant

ANS: A

35. The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 180Hz?
  • A. 4
  • B. 3
  • C. 2
  • D. 1

ANS: B

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7 Tips to Prepare for Physics Exams

  1. Don’t make reading your hobby: A lot of people put reading as a hobby in their CV, they might be right because they have finished schooling. But “You” are still schooling, so reading should be a top priority, not a hobby. Read far and wide to enhance your level of aptitude
  2. Get Exams Preparation Materials: These involve textbooks, dictionaries, Babcock University Post UTME Past Questions and Answers, mock questions, and others. These materials will enhance your mastery of the scope of the exams you are expecting.
  3. Attend Extramural Classes: Register and attend extramural classes at your location. This class will help you refresh your memory and boost your classroom understanding and discoveries of new knowledge.
  4. Sleep when you feel like: When you are preparing for any exams, sleeping is very important because it helps in the consolidation of memory. Caution: Only sleep when you feel like it and don’t oversleep.
  5. Make sure you are healthy: Sickness can cause excessive feelings of tiredness and fatigue and will not allow you to concentrate on reading. If you are feeling as if you are not well, report to your parent, a nurse, or a doctor. Make sure you are well.
  6. Eat when you feel like it: During the exam preparation period, you are advised not to overeat, and to avoid sleep. You need to eat little and light food whenever you feel like eating. Eat more fruits, drink milk and glucose. This will help you enhance retention.
  7. Reduce your time on social media: Some people live their entire lives on Facebook, Twitter, WhatsApp, Messenger chat. This is so bad and catastrophic if you are preparing for exams. Try and reduce your time spent on social media during this time. Maybe after the exams, you can go back and sleep in it.

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