Q. What is the effect of deforestation on local climate?
A.
Increased rainfall
B.
Decreased temperature
C.
Increased temperature
D.
No effect
Show solution
Solution
Deforestation typically leads to increased temperatures in the local climate due to reduced transpiration and increased solar radiation absorption.
Correct Answer:
C
— Increased temperature
Learn More →
Q. What is the effect of deforestation on river soil quality?
A.
Improves soil quality
B.
No effect
C.
Decreases soil quality
D.
Increases soil moisture
Show solution
Solution
Deforestation decreases soil quality by increasing erosion and reducing the organic matter content in the soil.
Correct Answer:
C
— Decreases soil quality
Learn More →
Q. What is the electron configuration of a chlorine atom (atomic number 17)? (2020)
A.
1s² 2s² 2p⁶ 3s² 3p⁵
B.
1s² 2s² 2p⁶ 3s² 3p⁶
C.
1s² 2s² 2p⁶ 3s² 3p⁴
D.
1s² 2s² 2p⁶ 3s² 3d⁵
Show solution
Solution
The electron configuration of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵, filling up to the 3p subshell.
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s² 3p⁵
Learn More →
Q. What is the electron configuration of a neutral carbon atom? (2022)
A.
1s² 2s² 2p²
B.
1s² 2s² 2p⁶
C.
1s² 2s² 2p⁴
D.
1s² 2s² 2p³
Show solution
Solution
Carbon has an atomic number of 6, and its electron configuration is 1s² 2s² 2p².
Correct Answer:
A
— 1s² 2s² 2p²
Learn More →
Q. What is the electron configuration of an oxygen atom? (2021)
A.
1s² 2s² 2p⁴
B.
1s² 2s² 2p²
C.
1s² 2s² 2p⁶
D.
1s² 2s² 2p³
Show solution
Solution
Oxygen has 8 electrons, and its electron configuration is 1s² 2s² 2p⁴.
Correct Answer:
A
— 1s² 2s² 2p⁴
Learn More →
Q. What is the empirical formula of a compound with a molecular formula C6H12? (2021)
A.
CH
B.
C2H4
C.
C3H6
D.
C6H12
Show solution
Solution
The empirical formula is obtained by dividing the subscripts by the greatest common divisor, which is 2. Thus, C6H12 becomes C3H6.
Correct Answer:
B
— C2H4
Learn More →
Q. What is the empirical formula of a compound with the molecular formula C6H12? (2021)
A.
CH
B.
C2H4
C.
C3H6
D.
C6H12
Show solution
Solution
The empirical formula is obtained by dividing the subscripts by the greatest common divisor, which is 2. Thus, C6H12 becomes C3H6.
Correct Answer:
B
— C2H4
Learn More →
Q. What is the energy of a photon with a frequency of 5 x 10^14 Hz? (Planck's constant h = 6.626 x 10^-34 J·s) (2021)
A.
3.31 x 10^-19 J
B.
1.32 x 10^-19 J
C.
2.48 x 10^-19 J
D.
4.97 x 10^-19 J
Show solution
Solution
Energy (E) = h * frequency = 6.626 x 10^-34 J·s * 5 x 10^14 Hz = 3.31 x 10^-19 J.
Correct Answer:
A
— 3.31 x 10^-19 J
Learn More →
Q. What is the equivalent resistance of two resistors of 4 ohms and 6 ohms connected in series?
A.
10 ohms
B.
24 ohms
C.
2.4 ohms
D.
0.67 ohms
Show solution
Solution
In series, the equivalent resistance is the sum: R_eq = R1 + R2 = 4 Ω + 6 Ω = 10 Ω.
Correct Answer:
A
— 10 ohms
Learn More →
Q. What is the equivalent resistance of two resistors of 4 ohms and 6 ohms in series?
A.
10 ohms
B.
24 ohms
C.
2.4 ohms
D.
0.67 ohms
Show solution
Solution
In series, the equivalent resistance is the sum: R_eq = R1 + R2 = 4 Ω + 6 Ω = 10 Ω.
Correct Answer:
A
— 10 ohms
Learn More →
Q. What is the equivalent resistance of two resistors, R1 = 4Ω and R2 = 6Ω, in parallel? (2022)
A.
2.4Ω
B.
10Ω
C.
24Ω
D.
1.5Ω
Show solution
Solution
The formula for equivalent resistance in parallel is 1/R_eq = 1/R1 + 1/R2. Thus, 1/R_eq = 1/4 + 1/6 = 5/12, so R_eq = 12/5 = 2.4Ω.
Correct Answer:
A
— 2.4Ω
Learn More →
Q. What is the equivalent resistance of two resistors, R1 and R2, in parallel? (2022)
A.
R1 + R2
B.
R1 * R2 / (R1 + R2)
C.
1 / (1/R1 + 1/R2)
D.
R1 - R2
Show solution
Solution
The formula for equivalent resistance (R_eq) of two resistors in parallel is given by 1 / (1/R1 + 1/R2).
Correct Answer:
C
— 1 / (1/R1 + 1/R2)
Learn More →
Q. What is the estimated temperature at the Earth's inner core?
A.
4000°C
B.
5000°C
C.
6000°C
D.
7000°C
Show solution
Solution
The temperature at the Earth's inner core is estimated to be around 6000°C.
Correct Answer:
C
— 6000°C
Learn More →
Q. What is the focal length of a diverging lens if the image distance is -15 cm and the object distance is -10 cm? (2023)
A.
-30 cm
B.
-20 cm
C.
-15 cm
D.
-10 cm
Show solution
Solution
Using the lens formula 1/f = 1/v - 1/u, we find f = -20 cm.
Correct Answer:
B
— -20 cm
Learn More →
Q. What is the formula for calculating electric power? (2023)
A.
P = IV
B.
P = I^2R
C.
P = V^2/R
D.
All of the above
Show solution
Solution
The electric power can be calculated using multiple formulas: P = IV (power = current × voltage), P = I^2R (power = current squared × resistance), and P = V^2/R (power = voltage squared / resistance).
Correct Answer:
D
— All of the above
Learn More →
Q. What is the formula for calculating the capacitance of a parallel plate capacitor?
A.
C = εA/d
B.
C = A/εd
C.
C = d/εA
D.
C = εd/A
Show solution
Solution
The capacitance (C) of a parallel plate capacitor is given by C = εA/d, where ε is the permittivity, A is the area of the plates, and d is the distance between them.
Correct Answer:
A
— C = εA/d
Learn More →
Q. What is the formula for calculating the concentration of hydrogen ions in a solution from its pH?
A.
[H+] = 10^-pH
B.
[H+] = pH/10
C.
[H+] = 10^pH
D.
[H+] = pH^10
Show solution
Solution
The concentration of hydrogen ions is calculated using [H+] = 10^-pH.
Correct Answer:
A
— [H+] = 10^-pH
Learn More →
Q. What is the formula for calculating the concentration of hydrogen ions in a solution with a pH of 5?
A.
1 x 10^-5 M
B.
1 x 10^-7 M
C.
1 x 10^-9 M
D.
1 x 10^-3 M
Show solution
Solution
The concentration of hydrogen ions is calculated as [H+] = 10^-pH = 10^-5 M.
Correct Answer:
A
— 1 x 10^-5 M
Learn More →
Q. What is the formula for calculating the normality of a solution?
A.
N = M x n
B.
N = M / n
C.
N = M + n
D.
N = M - n
Show solution
Solution
Normality (N) is calculated as the molarity (M) multiplied by the number of equivalents (n).
Correct Answer:
A
— N = M x n
Learn More →
Q. What is the formula for calculating the pH of a solution?
A.
pH = log[H+]
B.
pH = -log[H+]
C.
pH = [H+]
D.
pH = 14 - pOH
Show solution
Solution
The formula for calculating pH is pH = -log[H+].
Correct Answer:
B
— pH = -log[H+]
Learn More →
Q. What is the formula for calculating the power consumed in an electrical circuit?
A.
P = IV
B.
P = I/R
C.
P = V/R
D.
P = IR
Show solution
Solution
The power consumed in an electrical circuit is given by the formula P = IV, where P is power, I is current, and V is voltage.
Correct Answer:
A
— P = IV
Learn More →
Q. What is the formula for the capacitance of a parallel plate capacitor?
A.
C = εA/d
B.
C = A/εd
C.
C = d/εA
D.
C = εd/A
Show solution
Solution
The capacitance C of a parallel plate capacitor is given by the formula C = εA/d, where ε is the permittivity, A is the area of the plates, and d is the separation between them.
Correct Answer:
A
— C = εA/d
Learn More →
Q. What is the formula for the total capacitance of two capacitors in parallel?
A.
C_total = C1 + C2
B.
C_total = C1 * C2
C.
C_total = C1 / C2
D.
C_total = C1 - C2
Show solution
Solution
For capacitors in parallel, the total capacitance is the sum: C_total = C1 + C2.
Correct Answer:
A
— C_total = C1 + C2
Learn More →
Q. What is the frequency of a sound wave with a wavelength of 2 meters traveling at 340 m/s?
A.
170 Hz
B.
340 Hz
C.
680 Hz
D.
3400 Hz
Show solution
Solution
Frequency = Speed / Wavelength = 340 m/s / 2 m = 170 Hz.
Correct Answer:
A
— 170 Hz
Learn More →
Q. What is the frequency of an AC signal with a period of 0.02 seconds?
A.
50 Hz
B.
100 Hz
C.
25 Hz
D.
200 Hz
Show solution
Solution
Frequency (f) is the reciprocal of the period (T). Thus, f = 1/T = 1/0.02 s = 50 Hz.
Correct Answer:
B
— 100 Hz
Learn More →
Q. What is the function of a capacitor in an electric circuit? (2022)
A.
Store energy
B.
Increase current
C.
Decrease voltage
D.
Convert AC to DC
Show solution
Solution
A capacitor is used to store electrical energy in an electric field, which can be released when needed.
Correct Answer:
A
— Store energy
Learn More →
Q. What is the function of chlorophyll in plants? (2022)
A.
Absorbing water
B.
Absorbing sunlight
C.
Transporting nutrients
D.
Storing energy
Show solution
Solution
Chlorophyll is the pigment in plants that absorbs sunlight, which is essential for photosynthesis.
Correct Answer:
B
— Absorbing sunlight
Learn More →
Q. What is the function of chloroplasts in plant cells? (2022)
A.
Energy production
B.
Photosynthesis
C.
Cell division
D.
Protein synthesis
Show solution
Solution
Chloroplasts are the organelles in plant cells where photosynthesis occurs, converting light energy into chemical energy.
Correct Answer:
B
— Photosynthesis
Learn More →
Q. What is the function of mitochondria in a cell? (2022)
A.
Photosynthesis
B.
Energy production
C.
Protein synthesis
D.
Cell division
Show solution
Solution
Mitochondria are known as the powerhouses of the cell, generating ATP through cellular respiration.
Correct Answer:
B
— Energy production
Learn More →
Q. What is the function of phloem in plants?
A.
Transport of water
B.
Transport of food
C.
Photosynthesis
D.
Storage of nutrients
Show solution
Solution
Phloem is responsible for the transport of food, particularly the sugars produced during photosynthesis, from the leaves to other parts of the plant.
Correct Answer:
B
— Transport of food
Learn More →
Showing 1261 to 1290 of 1958 (66 Pages)