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Total 815 Questions | Updated On: May 15, 2024

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Question 1

Which of the following will halve the magnitude of the electrostatic force of attraction between two charged

particles?

Section: Physical Sciences

A : Doubling the distance between the particles

B : Halving the charge on each particle

C : Halving the charge on only one of the particles

D : Placing a positively charged particle midway between the particles

Answer: C

Question 2

When softball players take batting practice, they often use a machine called an “automatic pitcher,” which is

essentially a cannon that uses air pressure to launch a projectile. In a prototype automatic pitcher, a softball is

loaded into the barrel of the cannon and rests against a flat disk. That disk is locked into place, and a high air

pressure is built up behind it. When the disk is released, the softball is pushed along the barrel of the cannon

and ejected at a speed of V0.

Figure 1 shows the batter and automatic pitcher. The angle of the barrel to the horizontal is θ. The unit vectors i

and j point in the horizontal and vertical directions respectively.

Figure 1

The height above the ground y of the softball as a function of time t is shown in Figure 2, where t = 0 at Point

A, t = tB at Point B, and t = tC at Point C. The softball is ejected from the barrel of the cannon at Point A; it

reaches its maximum height at Point B; and the batter hits the softball at Point C. (Note: Assume that the

effects of air resistance are negligible unless otherwise stated.)

Figure 2

How will V0 change if the impulse on the softball remains the same but its mass is doubled?

Section: Physical Sciences

A : It will decrease by a factor of 4.

B : It will decrease by a factor of 2.

C : It will not change.

D : It will increase by a factor of 2.

Answer: B

Question 3

Which of the following cell types does NOT contain the diploid number of chromosomes?

Section: Biological Sciences

A : Spermatogonium

B : Spermatid

C : Zygote

D : Primary oocyte

Answer: B

Question 4

When softball players take batting practice, they often use a machine called an “automatic pitcher,” which is

essentially a cannon that uses air pressure to launch a projectile. In a prototype automatic pitcher, a softball is

loaded into the barrel of the cannon and rests against a flat disk. That disk is locked into place, and a high air

pressure is built up behind it. When the disk is released, the softball is pushed along the barrel of the cannon

and ejected at a speed of V0.

Figure 1 shows the batter and automatic pitcher. The angle of the barrel to the horizontal is θ. The unit vectors i

and j point in the horizontal and vertical directions respectively.

Figure 2

What is the ratio of the horizontal distance traveled by the softball at Point B to the horizontal distance traveled

at Point C?

Section: Physical Sciences

A : 5:1

B : 4:1

C : 3:3

D : 1:2

Answer: D

Question 5

It is critical for the human body blood to maintain its pH at approximately 7.4. Decreased or increased blood pH

are called acidosis and alkalosis respectively; both are serious metabolic problems that can cause death. The

table below lists the major buffers found in the blood and/or kidneys.

Table 1

Buffer

pKa of a typical conjugate acid:*

Histidine side chains

Organic phosphates

N-terminal amino groups

6.1

6.3

6.8

7.0

8.0

9.2

Reaction 1

How does the titration of a weak monoprotic acid with a strong base differ from the titration of a strong

monoprotic acid with a strong base?

Section: Physical Sciences

A : The equivalence point will occur at a higher pH.

B : The equivalence point will occur at a lower pH.

C : The equivalence point will occur at the same pH.

D : Whether the equivalence point is higher or lower depends on the particular monoprotic acids used.

Answer: A

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Total 815 Questions | Updated On: May 15, 2024

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