>OBAFEMI AOLOWO UNIVERSITY(OAU) 2006 PHYSICS POST-UTME PAST QUESTIONS. FREE(A)

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OBAFEMI AWOLOWO UNIVERISTY
2006 POST UME TEST
SUBJECT: Physics (QUESTIONS 1-9 OF 23)
INSTRUCTION: ANSWER ALL QUESTIONS
1. A 70kg man ascends a flight of stair of height 4m in 7s. the power expended by the man is
(a) 40w
(b) 100w
(c) 280w
(d) 400w
2. A body accelerates uniformly from rest at 6ms -2 for 8 seconds and then decelerates uniformly to rest in the next 5 seconds . The magnitude of the deceleration is :
(a) 9.6ms -2
(b) 48ms -2
(c) 24.0ms 2
(d) 39.4ms -2
3. A nail is pulled from a wall with a string tied to the nail. If the string is inclined at an angle of 30 0 to the wall and the tension in the string is 50N ,the effective force used in pulling the nail is
(a) 25N
(b) 25?3N
(c) 50N
(d) 50?3N
4. If M and R are the mass and radius of the earth respectively and G is the universal gravitational constant, the earth's gravitational potential at an altitude H above the ground level is:
(a ) -GM/H
(b) -GM/(R+H)
(c) -GM/2H
(d) –GM/(R-H)
5. Which of the following statement is not true:
(a) As the slope of an inclined plane increases, the velocity ratio decreases. Acceleration due to gravity g= 9.8m/s. Gas constant R = 8.31 j/mol.K. Speed of light in vacuum C= 3.0 x 10 8 m/s. Planck constant H = 6.63 x 10 -34 j.s
(b) The efficiency of an inclined plane decreases as a slope increases.
(c) The effort required to push a given load up an inclined plane increases as the slope increases
(d) The mechanical advantage of a smooth inclined plane depends on the ratio of the length of the height of the plane.
6. The ice and steam point of a thermometer are 20mm and 100mm respectively. A temperature of 75 0 C corresponds to Ymm on the thermometer. What is Y?
(a) 100mm
(b) 70mm
(c) 80mm
(d) 60mm
7. An electric kettle with negligible heat capacity is rated to 2000w. If 2.0kg of water is put in it , how long will take the temperature of water to rise from 20 0 to 100 0 ? [ specific heat capacity of water = 4200J kg -1 k -1 ]
(a) 336s
(b) 420s
(c) 168s
(d) 84s
8. A quantity of ice at 10 0 C is heated until the temperature of heating vessel is 90 0 C . Which of the following constant is NOT required to determine the quantity of heat supplied to the vessel?
(a) Specific latent heat of vaporization
(b) Specific heat capacity of ice
(c) Specific latent heat of fusion.
(d) Specific heat capacity of water.
9. The scent from jar of perfume opened in one corner of a room is picked up in another part of the room. The perfume move through the air molecules by what process.
(a) Evaporation
(b) Osmosis
(c) Diffusion
(d) Convection
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ANSWER KEY
1. D
2. A
3. A
4. B
5. B
6. C
7. A
8. A
9. C

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