Fundamental Principles Of Biology And Electrical Systems Practice Tests

Question 1

An atmospheric sample contains $78\%$ Nitrogen, $21\%$ Oxygen, and $1\%$ other gases. If a closed container holds $500	ext{ cm}^3$ of this air, calculate the volume of Oxygen present.

Accepted Answer

105 cm^3

Answer

78 cm^3

Answer

390 cm^3

Answer

500 cm^3

Question 2

A plant produces $180	ext{ g}$ of glucose ($C_6H_{12}O_6$) during photosynthesis. Given the molar mass of glucose is $180	ext{ g/mol}$, calculate the number of moles of $CO_2$ consumed, using the equation $6CO_2 + 6H_2O 	o C_6H_{12}O_6 + 6O_2$.

Accepted Answer

6

Question 3

In a food chain, energy transfer follows the $10\%$ rule. If the producer level contains $5000	ext{ kJ}$ of energy, how much energy is available to the secondary consumer?

Accepted Answer

50 kJ

Answer

5000 kJ

Answer

500 kJ

Answer

5 kJ

Question 4

If a glowing splint is inserted into a test tube containing pure Nitrogen, the splint will relight.

Accepted Answer

False

Answer

True

Question 5

Which of the following conditions are strictly required for the process of photosynthesis to occur in green plants?

Answer

Light energy

Answer

Chlorophyll

Answer

Carbon dioxide

Answer

Water

Answer

Oxygen

Question 6

A student measures the rate of gas exchange in an alveolus. If the partial pressure of $O_2$ in the air sac is $13.3	ext{ kPa}$ and in the blood is $5.3	ext{ kPa}$, calculate the pressure gradient ($ΔP$) driving diffusion.

Accepted Answer

8.0 kPa

Question 7

During a starch test, a leaf is boiled in ethanol. What is the primary purpose of this step?

Accepted Answer

To remove chlorophyll from the leaf

Answer

To kill the leaf cells

Answer

To soften the leaf tissue

Answer

To activate the starch enzymes

Question 8

Respiration in human cells produces carbon dioxide and water as byproducts.

Accepted Answer

True

Answer

False

Question 9

If a population of primary consumers has a biomass of $200	ext{ kg}$, calculate the maximum biomass of secondary consumers that can be supported, assuming a $10\%$ energy transfer efficiency.

Accepted Answer

20 kg

Question 10

Which indicator is used to detect the presence of $CO_2$ by changing from red to yellow?

Accepted Answer

Hydrogencarbonate indicator

Answer

Limewater

Answer

Cobalt chloride paper

Answer

Iodine solution

Question 11

A circuit contains a voltage source of $V = 12	ext{ V}$ and a resistor. If an ammeter connected in series reads $I = 0.5	ext{ A}$, what is the resistance $R$ of the resistor in the circuit?

Accepted Answer

24 $\Omega$

Answer

6 $\Omega$

Answer

12 $\Omega$

Answer

48 $\Omega$

Question 12

A household appliance operates at a voltage of $230	ext{ V}$ and draws a current of $4	ext{ A}$. Calculate the power $P$ consumed by the appliance in Watts ($W$) using the formula $P = V \cdot I$.

Accepted Answer

920 W

Question 13

Which of the following modifications to a cylindrical wire would result in an increase in its electrical resistance $R$, given the relationship $R = \rho \frac{L}{A}$ where $\rho$ is resistivity, $L$ is length, and $A$ is cross-sectional area?

Answer

Increasing the length $L$ of the wire

Answer

Decreasing the length $L$ of the wire

Answer

Increasing the cross-sectional area $A$ of the wire

Answer

Decreasing the cross-sectional area $A$ of the wire

Question 14

In a household circuit, if three lamps are connected in parallel to a $230	ext{ V}$ supply, the voltage across each individual lamp is equal to $230	ext{ V}$.

Accepted Answer

True

Answer

False

Question 15

A rheostat is adjusted such that the resistance in a circuit changes from $10	ext{ }\Omega$ to $20	ext{ }\Omega$ while the voltage remains constant at $10	ext{ V}$. Determine the change in current $\Delta I = I_{final} - I_{initial}$.

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 16

A circuit contains a resistor with a resistance of $R = 20\, \Omega$ connected to a voltage source of $V = 12\, 	ext{V}$. If the resistance is increased to $R' = 30\, \Omega$ while keeping the voltage constant, what is the new current $I'$ flowing through the circuit?

Accepted Answer

0.4 A

Answer

0.3 A

Answer

0.6 A

Answer

0.8 A

Question 17

An appliance consumes $2.5\, 	ext{kW}$ of power and is used for $4\, 	ext{hours}$ daily. Calculate the total electrical energy consumed in one week (7 days) in kilowatt-hours (kWh).

Accepted Answer

70 kWh

Question 18

Which of the following statements correctly describe the function of components in a three-pin plug circuit?

Answer

The fuse breaks the circuit if the current exceeds a safe limit.

Answer

The earth wire provides a low-resistance path to the ground to prevent electric shocks.

Answer

The neutral wire carries the high voltage current into the appliance.

Answer

The live wire is always connected to the ground to ensure zero potential.

Question 19

In a household parallel circuit, if one light bulb burns out, the current in the other branches of the circuit remains unchanged because the voltage across each branch is independent.

Accepted Answer

True

Answer

False

Question 20

A circuit has a total power rating of $P = 2300\, 	ext{W}$ and is connected to a mains supply of $V = 230\, 	ext{V}$. Determine the current $I$ flowing through the circuit.

Accepted Answer

10 A

Fundamental Principles Of Biology And Electrical Systems Practice Tests

Practice Tests

Fundamental Principles of Biology and Electrical Systems

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