Physics 2021 Past Questions | JAMB

Study the following Physics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

  1. The slope of the straight line displacement-time graph indicates?
  • A. distance traveled
  • B. uniform velocity
  • C. uniform acceleration
  • D. uniform speed

2. A man will exert the greatest pressure when he —–?

  • A. lies flat on his back
  • B. lies on his belly
  • C. stands on both feet
  • D. stands on the toes of one foot

3. Which of the units of the following physical quantities are derived?

I. Area
II. Thrust
III. Pressure
IV. Mass

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

4. A ball of mass 0.5kg moving at 10ms−1collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

  • A. 0.2ms−1
  • B. 0.5ms−1
  • C. 5.0ms−1
  • D. 5.5ms−1

5. The motion of a body is simple harmonic if the?

  • A. acceleration is always directed towards a fixed point
  • B. path of motion is a straight line
  • C. acceleration is proportional to the square of the distance from a fixed point
  • D. acceleration is constant and directed towards a fixed point

6. Which of the following is not correct about the molecules of a substance in a gaseous state. They

  • A. are in a constant state of motion
  • B. have different speeds
  • C. have a temperature which is measured by the average kinetic energy
  • D. The collision between the gases is perfectly inelastic

7.  A given mass of gas has a pressure of 80 Nm−2at a temperature of 47 C. If the temperature is reduced to 27 C with volume remaining constant, the new pressure is?

  • A. 46.0 Nm−2
  • B. 75.0 Nm−2
  • C. 80.0 Nm−2
  • D. 85.3 Nm−2

8.  0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 42000jkg11Cº. Calculate the specific latent heat of fusion of ice.

  • A. 9.0kjkg−1
  • B. 84.0kjkg−1
  • C. 134.0kjkg−1
  • D. 168.0kjkg−1

9. Which of the following instruments may be used to measure relative humidity

  • A. Hydrometer
  • B. Manometer
  • C. Hygrometer
  • D. Hypsometer

10. A source of sound produces waves in air of wavelength 1.65m. If the speed of sound in air is 330m−1s, the period of vibration in air is?

  • A. 200
  • B. 0.005
  • C. 0.5
  • D. 0.02

11. A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms−1, how far is he from the cliff?

  • A. 680m
  • B. 170m
  • C. 34m
  • D. 85m

12. Which of the following is not a vector quantity?

  • A. momentum
  • B. force
  • C. temperature
  • D. displacement

13. Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23g−1k−1(specific latent heat of vaporization of water is 2260jg−1k−1)

  • A. 530000J
  • B. 23200J
  • C. 17200J
  • D. 130000J

14.  In a series R-L-C circuit at resonance, the voltages across the resistor and the inductors are 30V and 40V respectively. What is the voltage across the capacitator?

  • A. 30V
  • B. 40V
  • C. 50V

D. 70V

15. If the frequency of an emitted x-ray is 1.6 x 101Hz, the accelerating potential is —– [e = 1.6 x 10-19J, h = 6.63 x 10-34Js]

  • A. 6630.0V
  • B. 663.0V
  • C. 66.3V
  • D. 6.6V
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