teas 7 science

Which of the following helps absorb small molecules in the samll intestine?

Microvilli

Which of the following is the integral connector between the nervous and endocrine systems?

Hypothalamus

Which of the following hormones produced by the stomach stimulates the secretion of gastric juice?

Gastrin

Which of the following structures enables the integumentary system to lower body temperatures?

Sweat glands

Which of the following is the structure involved in chemical digestion of protein?

Stomach

Which of the following is a hormone that induces bile and pancreatic juice secretion?

Cholecystokinin

Which of the following happens to skin when underlying blood vessels constrict?

Goosebumps appear on the skin

Which of the following is the effect of blood vessels moving closer to the skin’s surface when they dilate?

Body temperature is lowered

Which of the following hormones do the testes produce giving secondary sexual characteristics?

Testosterone

Which of the following macromolecules is found in the majority of enzyme catalysts?

Protein

Which of the following macromolecules are made up of chains of amino acids?

Protein

[image] Which of the following statements is true based on the above chart?

Magnesium melts before calcium, but magnesium is denser

Which of the following explains the typical type of feedback loop in the endocrine system?

Negative feedback loop

Which of the following connects the larynx to the lungs?

Trachea

Which of the following is the condition at which a pure substance can coexist ina solid, liquid, and vapor phase?

Triple point

Which of the following describes the location of the liver in relation to the appendix?

Both are in the same sagittal plane

Which of the following is in the body’s response to breathing at high altitudes?

Increasing the breathing rate

Which of the following is the outermost layer of the skin?

Epidermis

Ultraviolet radiation, UV, has been shown to cause damage to DNA sequences. This type of radiation is given off by the sun. Melanoma, a dangerous form of skin cancer, has been linked to the damage of DNA sequences leading to mutations in DNA sequences important to cell division.

Which of the following could lead to an increased risk of melanoma?

Increasing exposure to UV

A mutation to a cell’s DNA is made at some point in time.

Which of the following explains how this would affect other cells?

The mutation would spread to new daughter cells of the cell that was mutated

Which of the following produces pigment to the skin

Melanin

Which of the following blood components helps regulate plasma levels to prevent tissue swelling?

Albumin

Which of the following are adaptive immune system components?

Lymphocytes

Which of the following is the mass of heavy cream with a density of 994 g/L and a volume of 1.4 liters?

1,391.6 g

Which of the following cells is involved in resorption of bone?

Osteoclasts

Which of the following is though tot be the gatekeeper of pain on the spinal cord?

The dorsal horn

Which of the following structures passes signals from neuron to neuron, neuron to muscle, or neuron to gland?

Synapses

While running on the treadmill, which of the following sympathetic responses will occur?

Increased blood pressure

You have just started an exercise program and did 25 pushups and 50 squats two days ago. Today your arms and legsa re very sore, so doign normal activities is painful.

Which of the following explains the reason for the discomfort you are feeling?

Soreness

Which heart chamber is responsible for sending deoxygenated blood to the lungs

right ventricle

Which of the following describes the concentration of respiratory gases in the blood carried by the pulmonary arteries?

Pulmonary arteries are low in oxygen and high in carbon dioxide

Which of the following chambers of the heart recieves oxygenated blood from the lungs?

left atrium

What does the act of shivering entail?

The body feels the need to warm up by quickly contracting and relaxing muscles

Hydrogen gas reacts with oxygen gas to form water.

2H₂(g)+0₂(g) → 2H₂O(I)

How many moles of oxygen are required to form four moles of water, assuming hydrogen gas is in excess?

2

Propane (C₃H₈) is a fuel used in fireplaces. It undergoes a combustion reaction to release carbon dioxide and water as shown.

C₃H₈+5O₂ → 3CO₂+4H₂O

How many moles of water will be produced from 22 grams of propane?

2

A 1 M solution of NaCI is prepared by adding 5.853 g of NaCI in 100 mL of water. It was then diluted to 1 L. What is the concentration of the diluted solution?

0.1 M

Which of the following options describe the formation of an ionic bond?

Transfer of valence electrons from one atom to another atom to complete its octet

A gas X reacts with an aqueous solution of calcium hydroxide (lime water) to form a white precipitate of calcium carbonate along with water molecules.

X(g)+Ca(OH)(aq) → CaCO₃(s)+H₂O(I)

What is gax X?

• in the multiple choice the # aren’t subscripted b/c it didn’t give the option for the mcq

CO2

Aluminum metal reacts with hydrochloric acid to form aluminum chloride and release hydrogen gas. Which of the following chemical equations for this reaction is balanced?

• The 3 and 2 in the final answers are not subscripted bc was not given the option to do so for the mcq. (AICI₃….H₂)

2AI(s)+6HCI(aq) → 2AICI3(aq)+3H2(g)

Which of the following statements is true about the electrons in an atom?

Electrons revolve around the nucleus in orbitals

Which of the following statements is true about the charge of electrons, protons, and neutrons in an atom?

Atoms contain positively charged protons, negatively charged electrons, and neutral neutrons

Which of the following statements is true about the number of electrons, protons, and neutrons present in a neutral atom?

The number of electrons is equal to the number of protons

A syringe is used to withdraw or inject fluids into a patient’s body. Which of the following units does the syringe measure the quantity of the fluid present inside it?

Milliliter

A beaker is a tool commonly used to store a certain amount of fluid in it. Which of the following units is used for measuring the amount of fluid in it?

Milliliters

A 1.5 m long gauze is cut into two equal parts. Which of the following would be the length of each part?

0.75 m

A bookseller has a packaging box that can hold ten notebooks. Which of the following tools can be used to measure the box’s length, breadth, and height?

Ruler

Potassium, being more reactive, can replace magnesium from its salt. This can be observed in a double displacement reaction of magnesium chloride with potassium hydroxide. Which of the following options represents the balanced equation of the reaction?

• in the mcq the parts that are subscripted are: MgCI₂…..(OH)₂

MgCI2(aq)+2KOH(aq) → Mg(OH)2(s)+2KCI(aq)

Ammonium sulfate is formed by the combination of ammonia and sulfuric acid. The given unbalanced equation shows the reactants and products of the reaction.

NH₃(g)+H₂SO₄(aq) → (NH₄)(sub>2SO₄(aq)

Which of the following options represent the change needed to balance the equation?

• anythign with _ means the next number is supposed ot be subscripted

Multiply the coefficient of NH_3 by 2

Which of the following statement is correct about the pH scale?

The pH scale is the quantitative measure of acidity or the basicity of non-aqueous solutions

Which of the following statements is true about a covalent bond?

It is formed between two non-metals by sharing their valence electrons

Two atoms, A and B, form a bond when an electron is transferred from atom A to atom B. Atom A gains a positive charge and atom B gains a negative charge. Which of the following bonds was formed between atom A and atom B?

Ionic bond

Fluorine is more reactive than oxygen and nitrogen. Which of the following statements justifies this characteristic of fluorine?

It requires one electron in the valence shell

A student prepares a solution by adding 5 g of salt and 100 mL of water to a beaker and mixing them with a stirrer. Which of the following statements is true about the contents of the beaker?

Salt is the solute and water is the solvent

Which of the following statements is true about an acid?

An acid can donate a proton

Which of the following solutions represent a basic solution?

A solution with a hydroxide donor and a pH greater than 7

A student adds iron filings in one test tube and an iron nail to the other test tube, then adds 5 mL hydrochloric acid to both of test tubes. A brisk effervescence is seen in the first test tube that burns with a pop-up sound confirming hydrogen, while there is no apparent change in the other test tube, indicating a slow reaction. Which of the following is the reason for the difference in the reaction rates?

Iron filings have more surface area than the iron nail

The decomposition of potassium chlorate (KCIO₄) occurs slowly. However, if a small amount of MnO₂ is added, the reaction speeds up fast. Which of the following statements is true about MnO₂ for this reaction?

MnO2 is a catalyst because it increases the rate of the reaction

Which of the following are the appropriate units to represent the room temperature using a thermometer?

Celsius and Fahrenheit

In a single displacement reaction, a potassium atom can replace a sodium ion from its salt, while a sodium atom cannot replace it.

K + NaX → Na+KX

Na+ KX → no reaction

Therefore, potassium is considered to be more reactive than sodium. Which of the following statements explains the reactivity order of sodium and potassium?

The valence electrons are more easily lost by potassium than by sodium

Which of the following are the products of the reaction?

CaCI₂(aq)+2H₂O(I) → Ca(OH)₂(aq)+2HCI(aq)

Ca(OH)_2 and HCI

Sulfur trioxide is formed by a combination reaction of sulfur dioxide and oxygen in the presence of a nitrous oxide catalyst. The equation below represnets the reaction

2SO₂(g)+O₂(g)^NO → 2SO₃(g)

Which of the following is the product of the reaction?

SO_3

With the application of heat, lead nitrate undergoes decomposition. The equation below represents the reaction

2Pb(NO₃)₂^triangle → 2PbO+4NO₂+O₂

Which fo the following is the reactant in this reaction?

Pb(NO_3)_2

In a neutralization reaction, an acid (HA) reacts with a base (BOH) to form salt and water. The equation below represents the reaction

HA(aq) + BOH(aq) → BA(aq) + H₂O(I)

Which of the following is the correct pH of the aqueous solution of BA salt?

7

A 6 kg box is placed on a surface. Two students investigate how different types of forces can affect its motion. The test box shows the steps for the investigation.

1. two students push the box for 5 min in the same direction

2. a student pushes the box for 5 min in one direction

3. note the distance the box moves when two students push the box

4. compare the distance the box moved each time

5. identify in which case the box moved faster

6. note the distance the box mores when one student pushes the box

2, 6, 1, 3, 4, 5

Two identical beakers that contain 50 mL of water at the same temperature are placed on a table. An experimenter adds 8 g of large copper sulfate crystals to the second beaker. This time taken for the water to turn blue and the crystals to disappear in each beaker is noted.

Which of the following hypotheses is being tested in the experiment?

Smaller crystals of copper sulfate diffuse faster than larger crystals

A 3 cm magnesium strip is placed in a 10 mL hydrochloric acid solution at room temperature. The time it takes for the strip to be completely dissolved in the solution is noted. The experiment is repeated by raising the temperature of the solution by 10* C each time for two trials. Again, the time it takes for the strip to be completely dissolved is noted in each case. Which of the following hypotheses is being tested?

Magnesium reacts faster with hydrochloric acid when the temperature of the solution is increased

An experiment is conducted to test the effect of temperature on the rate at which water evaporates. Two identical beakers with an equal amount of water at two different temperatures are kept by a windowsill. The amount of water in the beakers was measured after 5 hr.

Which of the following is the dependent variable in the experiment?

The amount of water in the beakers after 5 hr

A student takes two beakers filled with 50 mL of water. THe water in the first beaker is at 27* C, while the water in the second beaker is at 50* C. The student adds 100 grams of sugar to each beaker, and the time taken for the sugar to be dissolved in each is compared.

Which of the following is the independent variable in the experiment?

The temperature of the water in the two beakers

In an experiment, two Petri dishes are prepared using nutrient agar with an equal amount of tap water in each dish. One of the dishes is exposed to sunlight for 2 hr, while the other is placed in the dark. The two dishes are then incubated at 25* C for 2 days and observed under the microscope to check for bacterial growth.

Which of the following is the dependent variable in the experiment?

The amount of bacterial growth

A burette is a laboratory tool used to collect liquid samples. Which of the following units of measurement would be used with this tool?

Milliliters

A handyman wants to measure the height of a door. Which of the following international system of units (SI) options would be appropriate for the object being measured

Meters

A student wants to measure a television screen length diagonally. Which of the following would be the appropriate unit for measuring the television screen?

Inches

A 1 M solution of NaCI is made by mixing 5.8 grams of NaCI of 100 mL of water in a volumetric flask. Then, an additional 100 mL of water is added to this solution.

Which of the following statements are correct? (select all that apply)

1. Mass of NaCI decreases in the solution

2. Mass of NaCI remains unchanged in the solution

3. The concentration of the solution decreases on dilution

4. The concentration of the solution increases on dilution

5. The number of moles of NaCI is the same before and after dilution

2, 3, 5

Which of the following statements are correct about atomic structures? (select all that apply)

1. an atom is made up of four subatomic particles

2. the electrons exist as standing waves

3. the nucleus is made up of protons placed over the bunch of neutrons

4. the electrons are present in orbitals around the nucleus

5. the nucleus is made up of neutrons and protons, and electrons are fixed around it

2, 4

An atom of an element has an atomic number 5 and has an atomic mass of 10 u. Which of the following statements are correct about the atom? (select all that apply)

1. it belongs to group 13 of the periodic table

2. it has five protons in the nucleus

3. it has ten neutrons in the nucleus

4. it belongs to period 3 of the periodic table

5. it has three electrons in its valence shell

1, 2, 5

An element lies in group 17 and period 2 of the periodic table. Which of the following statements are correct about the properties of the element? (select all that apply)

1. it is the most electropositive element of the period

2. the element has the highest ionization energy among the elements of the period. Therefore, it is the least electropositive element of the period

3. it has the largest size among the elements of the period

4. it has the smallest size among the elements of the group

5. it has the least effective nuclear charge among the elements of the group

2, 4

A student examines the pH of various substances available around us. The table represents the substance and its pH.

(table)

Substance pH

baking soda 9

tomato juice 4

lemon juice 2

bleach 12

pure water 7

Which of the following substances are alkaline in nature? (select all that apply)

1. Baking soda

2. Tomato juice

3. Lemon juice

4. Bleach

5. Pure water

1, 4

A sphygmomanometer is a device that is used to measure blood pressure. Which of the following options shows the unit of measurement of blood pressure using a sphygmomanometer?

mmHg

Which of the following units is marked on a syringe to measure the amount of medicine being injected into the body?

mL (milliliter)

A farmer cuts a 12 m long bamboo into four equal pieces. Which of the following would be the length of each piece?

3 m

A student makes two arrangements using pulleys, a rope, and a spring balance. The student lifts a block using spring balance in each arrangement and notes the reading as shown.

(table)

Which of the following options explain the observation?

An increase in the number of pulleys reduces the effort to lift the block

A student designed an electric circuit using lemons, copper pennies, galvanized nails, clipped copper wires, and LED lights. The student completed the circuit by connecting copper pennies and galvanized nails embedded in the lemons to the LED lights through clipped copper wire. The student experimented two times by combining lemons in a three identical lemons and then a circuit of four identical lemons. The data is recorded in the table.

(table)

Which of the following statements explains the cause and effect of this experiment?

The greater number of lemons, the greater the brightness of the LED

Which of the following statements is true about the molecular motion in gases?

Gas particles vibrate and move quickly with spaces between them and no regular arrangement

Which of the following statements correctly compares the molecular motion of gas at two different temperatures?

The molecules of a gas move faster at higher temperatures due to an increase in kinetic energy

Which of the following explains the change observed when wax is heated?

Wax undergoes a physical change as it undergoes melting

Water in a bowl is kept on the roof for birds on a hot afternoon. After a few hours later, it is observed that the quantity of water in the bowl is reduced. Assuming the birds did not drink the water, which of the following explains the change in quantity?

The water in the bowl evaporated by absorbing heat from the surroundings

A student takes a can of soda out of the refrigerator and keeps it on the table. After some time, the student observes water droplets on and around the can. However, the can is still sealed. Which of the following explains the presence of water droplets?

The water present in the air condenses by transferring heat to the can and accumulating on it

A student kept naphthalene balls in their clothes to protect them from insects and moths before storing them. After a few months, when these clothes are taken out, the student observes that the naphthalene balls have vanished.

Which of the following explains the absence of naphthalene balls?

the naphthalene balls undergo sublimation

Which of the following options shows the correct sequence of biological level of organization?

Smooth muscle cell → Smooth muscle tissue → Urinary bladder → Urinary system

Which of the following options distinguishes the active and passive transport mechanisms?

VIDEO 4

Active transport:

Passive transport: