1. Which among the following situations DOES NOT describe the importance of the Second Law of Thermodynamics? A. Explains why gasoline makes the
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1. Which among the following situations DOES NOT describe the importance of the Second Law of Thermodynamics?

A. Explains why gasoline makes the engine run

B. Explains why hot pans cool down

C. Explains why our bodies stay warm even when it's cold.

D. None of the above


2. Casey wanted to know the nature of soap suds. She observed that when she placed the red litmus paper it turned blue. what type of substance is this?

A. acid C. neural

B. base D. salt


3. Phenolphthalein is a chemical compound often used in the process of titration. What is the color of

phenolphthalein in an acid when it reaches its end point ?

A. colorless C. pink

B. orange D. yellow


4. Which of the following statement is true ?

A. A basic solution has higher H+ than OH

B. A neutral solution has higher H+ than OH-

C. An acidic solution has higher H+ than OH-

D. A neutral solution has lesser H+ than OH-


5. Which of the following statement is NOT true about acids ?

A. Its pH level is from 1-6

B. t changes the litmus from red to blue

C. It gives hydrogen ions when dissolved in water

D. It changes the litmus from blue to red


6. What is the hydronium ion concentration of coffee that has a pH of 4?

A. 1X10^4 C. 1 X10

B. 1X10^-10 D. 1X1010


7. The process by which electricity is used to bring about a chemical change is called

A. voltage

B. corrosion

C. oxidation

D. electrolysis


8. Which best describes a chemical system in equilibrium?

A. The rate of chemical reaction is slower than the rate of reverse reaction

B. The rate of forward reaction is equal to the rate of the reverse reaction

C. The rate of chemical reaction is slower than the rate of reverse reaction

D. No reaction takes place


9. Which among the following factors affect the change in entropy?

A. Change in phase C. Change in the number of particles

B. Change in temperature D. All of the above


10. Which among the following statement is TRUE when entropy is positive?

A. Entropy causes exothermic reaction C. Entropy causes endo-exo reaction

Entropy causes endothermic reaction D. All of the statements are talse.


11. Which process results In an entropy change less than 0?

A. dissolving C. freezing

B. Evaporation D. melting


12.In chemical cell composed of two half cells, what allows ions to flow from one half cell to the other?

A. a wire C. a salt bridge

B. a voltmeter D. the electrodes


13. A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight at rest. They couple upon collision and move away at

A. 2 m/s. C. 2/3 m/s.

B. 1 m/s. D. 1/3 m/s.


14. Your family chose a floating hut for a picnic. You needed to transport your things to the hut and pass by a shallow part of the river. You were tasked to bring the casserole filled with adobo. You noticed that when you put the casserole on water, it fees lighter.

Which scientific concept explains this?

A. Archimedes' Principle C. Pascal's Law

B. Bernoulli's Principle D. Newton's Law


15. An experiment requires the determination of the upward force experience by an object partially submerged in water. When the object is placed a water-filled container, water us collected and weighed. Which scientific concept support these procedures?

A. Archimedes' Principle C. Pascal's Law

B. Bernoulli's Principle D. Newton's Law


16. Passengers of the Light Rail Transit (LRT) are reminded to stay behind the yellow line while waiting at train stations. What happens to the pressure behind a person very close to the train tracks when the train passes at high speed in front?

A. The pressure becomes greater for the person at the front.

B. The pressure is the same for a the persons at the train station.

C. The pressure is less for the person at the front.

D. The pressure becomes zero.


17. A 40N block exerts 20 Pa of pressure on a table. What is the area of the block that is touching the table?

A. 0.5 meters squared

B. 1 meters squared

C. 2 meters squared

D. 4 meters squared


18. Suppose that a huge tank 50m high and filled with water is open to the atmosphere and is hit with a bullet that pierces one side of the tank, allowing water to flow out. The hole is 2m above the ground. If the hole is very small in comparison with the size of the tank, how quickly will the water flow out of the tank?

A. 940.8m/s

B. 21.69m/s

C. 30.67m/s

D. 112.8 m/s


19. Coulomb's law is only true for point charges whose sizes are

A. medium C. very small

B. very large D. large


20. Which of the following is true about electric field lines?

A, They are directed to the electric field

B. They are proportional to the magnitude of the test charge

C. Their directions depend on the source charge

D. They are proportional to the distance from the source charge


21. Charge b is placed between charges a and b along the horizontal. When does the net force on b become zero?

A. When the magnitude of a and c are equal

B. When the distance between a and b is equal to the distance between c and b

C. When the force of repulsion is equal to the force of attraction among them

D. Both A and B


22. What is the electric field strength created by a source charge of 1.0C at a

distance of 2.0 m?

A. 2.25x 10^9 N/C C. 1.80 x 10^9 N/C

B. 4.50 x 10^9 N/C D. 4.50x 10^10 N/C


23. How far is an electric field strength of 300.0 N/C from a source charge of 2.0 C?

A. 6.00 x10^7 m C. 5346.73 m

B. 7745.97 m D. 4.23 x 10^7' m














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