Question

1. Evaluate: (a+b)/(c-d) + 9/(a+d) when a=5, b=3, c=8, d=4

a. 6
b. 3
c. 15/2
d. 17/13

2. Solve for x: 5(x+3) = 35

a. 2
b. 7
c. 4
d. -4

3. Acid rain occurs primarily as a result of

a. operating a nuclear power plant
b. burning coal or oil containing sulfur
c. by-products created by operating an oil refinery
d. the use of Freon and other refrigerants

4. The "ozone holes" at the polar region arise from

a. technological use of ozone to create new chemical products
b. release of sulfur compounds into the air
c. conversion of ozone into oxygen by sunlight
d. release of Freon and related products into the atmosphere

5. Ozone is important primarily as a(n)

a. source of oxygen for breathing
b. absorber of the Sun's infra-red radiation
c. protection against the greenhouse effect
d. filter for ultra-violet waves

6. The "greenhouse effect" refers to

a. the absorption of carbon dioxide by plants
b. the release of oxygen by plants
c. the absorption of solar radiation by the Earth and its atmosphere and subsequent trapping of the energy
d. the use of greenhouses to increase the Earth's food supply

7. Of the following, the longest is

a. 2 mi
b. 2 km
c. 1000 m
d. 2000 ft

8. A bicycle travels 6 km in 20 min. Its average speed is

a. 0.3 km/h
b. 8 km/h
c. 18 km/h
d. 48 km/h

9. A car's speed increases from 0 m/s to 20 m/s in 10 s. Its average acceleration is

a. 20 m/s²
b. 10 m/s²
c. 2 m/s²
d. 0 m/s²

10. An object is dropped from the roof of a building. Its speed after 5 s (neglecting air resistance) is

a. 49 m/s
b. 9.8 m/s
c. 5 m/s
d. 1.96 m/s

11. After it leaves the hand, the acceleration of a stone thrown upward is

a. greater than that of a stone thrown downward
b. the same as that of a stone thrown downward
c. less than that of a stone thrown downward
d. zero as it moves up; 9.8 m/s² as it comes down

12. When an object is accelerated

a. its direction always changes
b. its speed always changes
c. a net force might not be acting on it
d. a net force must be acting on it

13. Of the following, the shortest is

a. 0.002 ft
b. 0.002 m
c. 0.02 in
d. 2 mm

14. A ball is thrown upward at a speed of 12 m/s. It will reach the top of its path in about

a. 0.6 s
b. 1.2 s
c. 1.8 s
d. 2.4 s

15. Given two objects of the same size and shape, where one is 4 times heavier than the other.
They are dropped simultaneously from a tower. Which of the following is true? (Neglect air resistance)

a. The heavy object strikes the ground before the light one
b. They strike the ground at the same time but the heavy object has greater acceleration because it has more mass
c. They strike the ground at the same time but the lighter object has the lower speed
d. They strike the ground at the same time with the same speed.

Answer 1