Uas Fisika Sbi 7

17th

Grade Physics Exercise Name________

1. You replace a Honda Civic (30 miles

per gallon) with a Toyota Prius (50 miles per gallon). You drive 15,000 miles per year. How much CO2 do you prevent being released into the atmosphere? Burning a gallon of gasoline releases 8.8 kg of CO2. a. 176 kg b. 1760 kg c. 18 metric tons d. 1.7 kg e. 880 kg

7. One liter of an ideal gas is heated

from 300 °C to 900 °C while the pressure is maintained at , 1 atm. What is the final volume of the gas, most nearly? 8. A liquid has (a) definite shape and volume (b) definite volume but no definite shape (c) no definite shape or volume (d) none of the preceding

2. If a car requires 30 seconds to

accelerate from zero to 90 km per hour, its average acceleration is, most nearly, 3. A car initially traveling westward at

16 m/s has a constant acceleration of 4 /S2 eastward. How far has the car traveled after 16 s? 4. Two objects are in thermal equilibrium if . a. they have the same temperature. b. they are each in thermal equilibrium with the same third object. c. they are in thermal contact and there is no net flow of thermal energy. d. anyone of the above statements is true.

9. Units of density are (a) kg/m3 (b) g/cm3 (c) both (a) and (b) (d) neither (a) nor (b)

10.Which of the following is the highest temperature? (a) 0°F (b) 0° C (c) 0° K (d) all are equal

5. A steel railroad rail is 556 m long.

How much does its length change during a day when the low temperature is 50° F (18° C) and the high temperature is 91°F (33° C)? Steel has a coefficient of thermal expansion, a = 1.2 x 10-5 1°C. 6. An object starts from rest, moves in a

straight line with a constant acceleration and covers a distance of 64m in 4s. Calculate • its acceleration • its velocity at what time the object had covered half the total distance • What distance the object had covered in half the total time.

11. The specific heat of substance A is

ten times greater than that of substance B. If equal amounts of heat are added to equal masses of the substances, the temperature increase of substance A is (a) the same as that of B (b) ten times greater than that of B (c) 1/10 that of B (d) none of the preceding

12. The specific heat of water is 1.0

kcal/kg•°C. If the temperature of 2.0 kg of water is lowered by 10°C, the amount of heat removed would be 1

27th

Grade Physics Exercise Name________ (a) 2 kcal (b) 5 kcal (c) 10 kcal (d) 20 kcal

20.Which one of these is a physical change? a.Paper burning b. Chocolate melting

13.A roaring fire transfers heat to a person sitting nearby chiefly by (a) conduction (b) convection (c) radiation (d) both (a) and (b)

14.The freezing point of water is decreased by (a) the addition of more water (b) pressure (c) dissolved table salt (d) both (b) and (c) 15.What is the density of 1000 kg of water? (a) 1000 kg/cm3 (b) 1000 kg/m3 (c) 1000 kg

c. An Iron nail rusting d. Baking a cake 21.Which of these best describes the meaning of the word hypothesis? a.Investigation b. Educated guess c. Recorded data d. List of Facts 22.The graph shows the movement of a car over time. What is the car’s average speed?

(d) 1000 g

16.What is the volume of 1000 kg of water? (a) 1cm3

(b) 1000 m3

(c) 1 m3

(d) 1000 cm3

17. An “empty” rectangular box has the

dimensions 1.0 m x 0.80 m x 0.75 m. What mass of air does it contain? (Density of air = 1.25 kg/m3) (a) 0.77 kg (b) 0.385 kg (c) 1.155 kg (d) 0.875 kg 18. If you wish to warm 100 kg of water

by 30° C from 0° C for your bath, how much heat is required? (Give your answer in calories and joules.) (a)1000 Kcal (b) 2000 Kcal (c) 3000 Kcal (d) 4000 Kcal 19. Convert the temperature 120°F to the

Celsius scale: (a) 120°C

(b) 45°C

(c) 48.89°C

(d) 15°C

a. 10 Kilometer/hour b. 15 Kilometers/hour

(A)

c. 10 Kilometers/hour d. 60 Kilometers/hour 23.Of the states of matter, gas is the only state that _____. a. Has a definite shape b. Has mass c. Is highly compressible (A)

d. Is fairly easy to manage 24.Chemists often use litmus paper to test the acidity of a substance. What 2

37th

Grade Physics Exercise Name________ color does litmus paper turn when an acid is applied to it? a. Blue b. Green c. Red (A) d. White

25.When a base is mixed with an acidic solution, neutralization occurs because the _____. a.Base Chemically reacts with the acid c. Base reaches absolute zero b. Mass of the solution increases d. Acid Evaporates

26. Describe the process of separating sand and salt mixture so both are returned to its original state. Use the chart on right to answer the following questions.

27.Find the density of substance A and B 28.Which substance is denser? 29.If you placed Substance A and Substance B in water, how would they separate

30. What is the consentration of a

solution containing 30 mL of MgCl2 in 250 mL of solution? 31.A car is going 30 m/s and stops in 2 seconds. What is its stopping distance for this speed?

Balance these chemical reactions! 3