Physics 2009 Objective — Question 1
Which of the following is a derived unit?
- A. Meter
- B. CoulombCorrect
- C. Kilogram
- D. Second
Explanation
The coulomb (charge=current×time) is derived; metre, kilogram, second, and ampere are all SI base units.
Post-UTME Physics 2009 Objective Past Questions
All 10 questions from the Post-UTME Screening (Post-UTME) Physics 2009 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
Advertisement
Physics 2009 Objective — Question 2
A bat emits its sound at a speed of 1650m/s (as given in the source) and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector.
- A. 8.75m
- B. 10.50m
- C. 87.75m
- D. 123.75mCorrect
Explanation
Distance = speed × time / 2 = 1650 × 0.15 / 2 ≈ 123.75m.
Physics 2009 Objective — Question 3
Two identical waves travelling in the same direction are superimposed. What should be the phase difference between the waves for maximum destructive interference to occur?
- A. 20°
- B. 45°
- C. 180°
- D. 225°
Explanation
Standard physics gives 180° (option C) for complete destructive interference between two identical waves; the source key marks 225° (option D), which appears to be an error.
Physics 2009 Objective — Question 4
The odour of a leaking gas is perceived at a distance from the source by the process of
- A. -----
- B. diffusionCorrect
- C. osmosis
- D. evaporation
Explanation
Gas molecules spreading through the air to reach your nose is diffusion.
Physics 2009 Objective — Question 5
A train has an initial velocity of 44m/s and an acceleration of -4m/s². Its velocity after 10s is
- B. 42m/s
- C. 4m/sCorrect
- D. 12m/s
Explanation
v=u+at=44+(-4)(10)=4m/s. (The source key's lettering for this item did not match its own shown working; the calculation clearly gives 4m/s.)
Physics 2009 Objective — Question 6
A simple pendulum with a period of 2.0s has its length doubled. Its new period is
- A. 1.005s
- B. 1.41s
- C. 0.35s
- D. 2.03s
Explanation
T∝√L, so doubling L multiplies T by √2: 2.0×√2≈2.83s.
Physics 2009 Objective — Question 7
An object is projected with a velocity of 100ms⁻¹ from the ground level at an angle to the vertical. Total time of flight of the projectile is 10s, calculate the angle (g=10ms⁻²)
- A. 0°
- B. 30°
- C. 45°
- D. 60°Correct
Explanation
T=2u cosθ/g (θ from vertical) gives 10=2(100)cosθ/10, so cosθ=0.5, θ=60°.
Physics 2009 Objective — Question 8
A gas has a volume of 546cm³ at 0°C. What is the volume of the gas at 100°C if its pressure remains constant?
- A. 346cm³
- B. 446cm³
- C. 546cm³
- D. 545cm³
Explanation
By Charles's Law: V2=V1×(T2/T1)=546×(373/273)≈746cm³.
Physics 2009 Objective — Question 9
In electrolysis experiments a cathode of mass 5g is found to weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?
- A. 0.00004g/CCorrect
- B. 0.00002g/C
- C. 0.02500g/C
- D. 0.05000g/C
Explanation
Z=mass deposited/(I×t)=0.01/(5×50)=0.00004g/C.
Physics 2009 Objective — Question 10
A magnetic needle is suspended first at earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are
- A. 0° and 0°
- B. 60° and 60°
- C. 90° and 90°
- D. 90° and 60°
Explanation
At the magnetic pole the needle points straight down (90° from horizontal); at the magnetic equator it lies horizontal (0°). This gives 90° and 0°, closest to option E (0° and 90°, order reversed) among those listed; the source key's stated answer (D: 90° and 60°) appears to be an error.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.