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.

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 102km−1
  • B. 3.0 x 103km−1
  • C. 5.0 x 103km−1
  • D. 3.0 x 104km−1

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 = 400Jkg1k−1, latent heat of fusion of ice = 3.3 x 105Jkg−1)

  • A. 8/3.3kg
  • B. 3.3/80kg
  • C. 80/33kg
  • D. 3.3/8kg

33.  The equation of a wave traveling along the positive x-direction is given by; y = 0.25 x 10 – 3 sin (500πt – 0.025x). Determine the angular frequency of the wave motion. 

  • A. 0.25 x 10−3rads−1
  • B. 0.25 x 10−1rads−1
  • C. 5.00 x 102rads−1
  • D. 2.50 x 103rads−1

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

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

36. A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is—–

  • A. 3m
  • B. 5m
  • C. 6m
  • D. 10m

37. The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a

  • A. concave mirror of focal length 5cm
  • B. concave mirror of focal length 10cm
  • C. convex mirror of focal length 5cm
  • D. convex mirror of focal length 10cm

38. The velocities of light in air and glass are 3.0 x 108ms−1and 2.0 x 108ms−1 If the angle of refraction is 30º, the sine of the angle of incidence is 

  • A. 0.33
  • B. 0.50
  • C. 0.67
  • D. 0.75

39. An astronomical telescope is said to be in normal adjustment when the——

  • A. eye is accommodated
  • B. focal length of an object lens is longer than that of eye piece
  • C. final image is at the near point of eye
  • D. final image is at infinity

40. A 2H inductor has negligible resistance and is connected to a 50πHz A.C supply. The reactance of the inductor is?

  • A. 200Ω
  • A. 50Ω
  • C. 100/π
  • D. 25/Πω
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