Scientific Reasoning MCQs

Question 1

In human blood, calcium (Ca2+) concentration is regulated by vitamin D3. First vitamin D3 is converted to calcidiol (CD) in the liver. An elevated concentration of CD inhibits furhter conversion of vitamin D3. Next, CD is conceverted to calcitriol (CT) in the kidneys in a reaction tht requires parathyroid hormone (PTH). An elevated concentration of CT increases Ca2+ concentration, which in turn inhibits further release of PTH. See figure 1According to Figure 3, the relative blood CT concentration is between 5 times normal and 6 times normal within which of the following blood Ca2+ concentration ranges?

Accepted Answer

8mg/100 mL to 9mg/100 mL

Answer

13mg/100 mL to 14mg/100 mL

Answer

10mg/100 mL to 11mg/100 mL

Answer

11mg/100 mL to 12mg/100 mL

Question 2

Procaine is a medication used for analgesia before a procedural intervention. It is a pharmaceutical medication belonging to the aminoester group of local anesthetics and it is commonly found as Nitrobenzoic acids, a derivative of benzoic acid. German chemist Alfred Einhorn first synthesized the drug as a safer anesthetic alternative to cocaine due to its side effect profile, patenting procaine under the trade name "Novocain". Historically, procaine has been used for local, regional, and neuraxial anesthesia via local infiltration, peripheral nerve blockade, and intrathecal injection. Nitrobenzoic acid can also have other isomers which have completely different uses and cannot be used as an alternative to Novacin. How many position isomers can Nitrobenzoic acid possibly form?

Accepted Answer

3

Answer

4

Answer

5

Answer

6

Question 3

A solute is any substance that is dissolved in another substance, which is called the solvent. A student tested the solubility (a measure of how much solute will dissolve into the solvent) of six different substances. The solubility of a substance at a given temperature is defined as the concentration of the dissolved solute that is in equilibrium with the solvent. Table 1 represents the concentration of dissolved substances in 100 grams of water at various temperatures. The concentrations are expressed in grams of solute per 100 grams of water.The data shown in table 1 support the conclusion that, for a given substance as the temperature of the water increases, the amount of solute that can be dissolved

Accepted Answer

Varies but with a trend depending on substance

Answer

Increases only

Answer

Decreases only

Answer

Varies but with no trend

Question 4

The atmosphere is made up of 4 distinct layers: the troposphere, stratosphere, mesosphere, and thermosphere. Different types of clouds form in the different layers depending on the pressure in the atmosphere and the ambient temperature. The cloud types include nimbus, stratus, cumulus, and cirrus. Figure 1 shows the location of the barriers of the atmosphere when the temperature and pressure are at an ideal condition for cloud formation. It also shows the different types of clouds formed at the different levels. Note: Clouds are formed mostly of water crystals, but can also contain particles of rock and dust.According to figure 1, the atmospheric layer with the greatest range in pressure is the

Accepted Answer

Thermosphere

Answer

Mesosphere

Answer

Stratosphere

Answer

Troposphere

Question 5

The atmosphere is made up of 4 distinct layers: the troposphere, stratosphere, mesosphere, and thermosphere. Different types of clouds form in the different layers depending on the pressure in the atmosphere and the ambient temperature. The cloud types include nimbus, stratus, cumulus, and cirrus. Figure 1 shows the location of the barriers of the atmosphere when the temperature and pressure are at an ideal condition for cloud formation. It also shows the different types of clouds formed at the different levels. Note: Clouds are formed mostly of water crystals, but can also contain particles of rock and dust.Which of the following statements about the formation of cumulus clouds is supported by data presented in figure 1Cumulus clouds form typically in

Accepted Answer

Pressures between 8 and 12 psi and at an average temperature of 35 degree c

Answer

Pressures between 12 and 16 psi and at an average temperature of 22 degree c

Answer

Pressure of 4 psi and at average temperatures between 12 and 22 degree c

Answer

Pressure of 18 psi and at average temperatures between 50 and 60 degree c

Question 6

The atmosphere is made up of 4 distinct layers: the troposphere, stratosphere, mesosphere, and thermosphere. Different types of clouds form in the different layers depending on the pressure in the atmosphere and the ambient temperature. The cloud types include nimbus, stratus, cumulus, and cirrus. Figure 1 shows the location of the barriers of the atmosphere when the temperature and pressure are at an ideal condition for cloud formation. It also shows the different types of clouds formed at the different levels. Note: Clouds are formed mostly of water crystals, but can also contain particles of rock and dust.According to fig 1 as pressure within the atmosphere layers increases, temperature within the atmospheric layers

Accepted Answer

Decreases only

Answer

Increases only

Answer

Increases up to 6 psi, then decreases

Answer

Decreases up to 10 psi then increases

Question 7

The atmosphere is made up of 4 distinct layers: the troposphere, stratosphere, mesosphere, and thermosphere. Different types of clouds form in the different layers depending on the pressure in the atmosphere and the ambient temperature. The cloud types include nimbus, stratus, cumulus, and cirrus. Figure 1 shows the location of the barriers of the atmosphere when the temperature and pressure are at an ideal condition for cloud formation. It also shows the different types of clouds formed at the different levels. Note: Clouds are formed mostly of water crystals, but can also contain particles of rock and dust.According to the information given in figure 1, clouds within the stratosphere are most likely formed

Accepted Answer

Under a pressure of 10 psi and 30 degree C

Answer

Under a pressure of 4 psi and 20 degree C

Answer

Over a pressure of 14 psi and 50 degree C

Answer

Over a pressure of 12 psi and 40 degree C

Question 8

The atmosphere is made up of 4 distinct layers: the troposphere, stratosphere, mesosphere, and thermosphere. Different types of clouds form in the different layers depending on the pressure in the atmosphere and the ambient temperature. The cloud types include nimbus, stratus, cumulus, and cirrus. Figure 1 shows the location of the barriers of the atmosphere when the temperature and pressure are at an ideal condition for cloud formation. It also shows the different types of clouds formed at the different levels. (Note: Clouds are formed mostly of water crystals, but can also contain particles of rock and dust.)If a pressure of 7 psi were sustained within the atmosphere, according to the image, which of the following types of clouds would likely form?

Accepted Answer

Stratus

Answer

Cirrus

Answer

Cumulus

Answer

Nimbus

Question 9

What is the correct order of the capacitances of these circuits, from lowest to highest? Assume all capacitances have the same capacitance.

Accepted Answer

C<B<A<D

Answer

B<A<C<D

Answer

D<C<B<A

Answer

D<C<A<B

Question 10

Dinitrophenol is a metabolic poison that prevents the production of ATP. What will happen when a resting axon is treated with such a poison?

Accepted Answer

The charge outside the axon membrane becomes less positive

Answer

The charge inside the axon membrane becomes more negative

Answer

The charge inside the axon membrane becomes less positive

Answer

The charge outside the axon membrane does not change

Question 11

A certain electron travels within a conductor. The path of electron for a short time interval is shown below. Which of these best represents the path the electron would have travelled if it was experiencing an additional constant force towards left? The dotted line shows the path.

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 12

Alcohols are carbon compounds containing a hydroxyl (OH) group. Alkenes are carbon compounds containing at least 1 carbon-carbon double bond (C=C).Dehydration (removal of H2O) of Alcohol W in the presence of phosphoric acid (H3PO4) produces H2O and a mixture of 4 alkenes (Alkenes 1-4) that each contain only 1 C=C bond:Dehydration of each of 3 other alcohols (Alcohols X, Y, and Z) produces H2O and 2 or more of Alkenes 1-4. Stu- dents studied the dehydration of each of these 4 alcohols, which are all liquids at 25°C.What was the most likely purpose of the sand bath shown in Figure 1 ?

Accepted Answer

To evenly distribute heat to the flask

Answer

To partially cool the test tube

Answer

To provide sand as a reactant in the dehydration reaction

Answer

To provide sand as a surface onto which the vapours would condense

Question 13

Alcohols are carbon compounds containing a hydroxyl (OH) group. Alkenes are carbon compounds containing at least 1 carbon-carbon double bond (C=C).Dehydration (removal of H₂O) of Alcohol W in the presence of phosphoric acid (H₃PO₄) produces H₂O and a mixture of 4 alkenes (Alkenes 1-4) that each contain only 1 C=C bond:Dehydration of each of 3 other alcohols (Alcohols X, Y, and Z) produces H₂O and 2 or more of Alkenes 1-4. Students studied the dehydration of each of these 4 alcohols, which are all liquids at 25°C.Which of the following statements gives the most likely reason that the test tube was cooled in ice water, as shown in Figure 1? The test tube was most likely cooled in ice water to more readily:

Accepted Answer

Condense the vapour produce

Answer

Condense the liquid produced

Answer

Evaporate the liquid produced

Answer

Evaporate the vapour produced

Question 14

A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?

Accepted Answer

When both the magnet and solenoid are moving in the same direction with the same speed

Answer

When the magnet is moving towards the solenoid

Answer

When the solenoid is moving towards the magnet

Answer

When both magnet and solenoid are moving in opposite directions with the same speed

Question 15

Two current-carrying wires with the same current flowing through them are placed one above the other as shown in the figure. If the wires form four regions A, B, C, and D as shown, which region has the strongest magnetic field out of the page?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 16

When the given figure is folded to form a cube then which face is opposite to the face with 2?

Accepted Answer

1

Answer

3

Answer

4

Answer

6

Question 17

Mohan is older than Prabir. Suresh is younger than Prabir. Mihar is older than Suresh, but younger than Prabir. Who among the four is the youngest?

Accepted Answer

Suresh

Answer

Prabir

Answer

Mohan

Answer

Mihir

Question 18

During a demonstration, a teacher placed 20 mL of water, 10 mL of isopropyl alcohol (IPA), and 1 drop of blue food coloring into a test tube, capped the test tube, and inverted it 6 times. Next, she added 7 g of ammonium sulfate (AS), an ionic solid, to the test tube, capped the test tube, and vigorously shook it for 10 sec. Then, over the 15 sec period immediately following the shaking, the mix- ture in the test tube completely separated into 2 distinct liquid layers (see figure).The teacher asked each of 4 students to provide an explanation for what occurred in the test tube over the 15 sec period.Student 1Over the 15 sec, the mixture separated into 2 layers because IPA is denser than water. The water layer was on top, and the IPA layer was on the bottom. The AS dissolved in the IPA only, because AS breaks apart into neutral molecules when dissolved in IPA. Blue food colouring is polar, so it dissolves in the water only.Student 2Over the 15 sec, the mixture separated into 2 layers because water is denser than IPA. The IPA layer was on top, and the water layer was on the bottom. The AS dis- solved in the water only, because AS breaks apart into neutral molecules when dissolved in water. Blue food colouring is polar, so it dissolves in the IPA only.Based on the figure, 5 see after the shaking, would the contents of the test tube have been better classified as a heterogeneous mixture or a homogeneous mixture?

Accepted Answer

Heterogeneous, because the contents of the test tube varied in composition from one region to another.

Answer

Homogeneous, because the contents of the test tube varied in composition from one region to another.

Answer

Heterogeneous, because the contents of the test tube were uniform in composition throughout.

Answer

Homogeneous, because the contents of the test tube were uniform in composition throughout.

Question 19

Suppose that 20 mL of water and 20 mL of IPA are poured into a beaker, mixed, and then allowed to settle. Based on Student 2's explanation, the resulting con- tents of the beaker would best be represented by which of the following diagrams?

Accepted Answer

C

Answer

B

Answer

A

Answer

D

Question 20

What will come at the place of the question mark? 3, 7, 23, 95, ?

Accepted Answer

479

Answer

62

Answer

128

Answer

575

Free Scientific Reasoning MCQs with Answers