Q. What is the potential difference between two points in an electric field if the electric field strength is 50 N/C and the distance between the points is 0.4 m? (2023)
A.
20 V
B.
10 V
C.
5 V
D.
2 V
Show solution
Solution
Potential difference V = E * d = 50 N/C * 0.4 m = 20 V.
Correct Answer: A — 20 V
Learn More →
Q. What is the potential difference between two points in an electric field of 400 N/C separated by 0.5 m? (2022)
A.
200 V
B.
100 V
C.
50 V
D.
80 V
Show solution
Solution
Potential difference V = E * d = 400 N/C * 0.5 m = 200 V.
Correct Answer: A — 200 V
Learn More →
Q. What is the potential energy of a mass in simple harmonic motion at maximum displacement? (2023)
A.
Zero
B.
Maximum
C.
Minimum
D.
Depends on mass
Show solution
Solution
At maximum displacement, potential energy is maximum and kinetic energy is zero.
Correct Answer: B — Maximum
Learn More →
Q. What is the potential energy of a system of two charges +3 μC and +4 μC separated by 0.2 m? (2023)
A.
-54 J
B.
54 J
C.
0 J
D.
27 J
Show solution
Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.2 m = 54 J.
Correct Answer: B — 54 J
Learn More →
Q. What is the potential energy of a system of two charges +3 µC and +4 µC separated by 0.3 m? (2023)
A.
-0.12 J
B.
0.12 J
C.
0.36 J
D.
0.24 J
Show solution
Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.3 m = 0.36 J.
Correct Answer: C — 0.36 J
Learn More →
Q. What is the potential energy of an object of mass 2 kg at a height of 10 m? (g = 9.8 m/s²) (2022)
A.
196 J
B.
98 J
C.
20 J
D.
10 J
Show solution
Solution
Potential energy (PE) is calculated using the formula PE = mgh. Here, PE = 2 kg × 9.8 m/s² × 10 m = 196 J.
Correct Answer: A — 196 J
Learn More →
Q. What is the potential energy of two charges +3 μC and +4 μC separated by 0.2 m? (2023)
A.
-54 J
B.
54 J
C.
0.54 J
D.
5.4 J
Show solution
Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.2 m = 54 J.
Correct Answer: B — 54 J
Learn More →
Q. What is the potential energy stored in a capacitor of capacitance C charged to a voltage V? (2021)
A.
CV
B.
1/2 CV^2
C.
1/2 QV
D.
QV
Show solution
Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2.
Correct Answer: B — 1/2 CV^2
Learn More →
Q. What is the potential energy stored in a capacitor? (2022)
A.
1/2 CV²
B.
CV
C.
1/2 QV
D.
QV
Show solution
Solution
The potential energy (U) stored in a capacitor is given by the formula U = 1/2 CV², where C is the capacitance and V is the voltage across the capacitor.
Correct Answer: A — 1/2 CV²
Learn More →
Q. What is the power consumed by a 10Ω resistor when a current of 3A flows through it? (2021)
A.
90W
B.
30W
C.
60W
D.
45W
Show solution
Solution
Power P = I^2 * R = (3A)^2 * 10Ω = 9 * 10 = 90W.
Correct Answer: A — 90W
Learn More →
Q. What is the power consumed by a resistor of 10 ohms carrying a current of 2 A? (2023)
A.
20 W
B.
40 W
C.
10 W
D.
5 W
Show solution
Solution
Power P = I^2 * R = (2 A)^2 * 10 Ω = 4 * 10 = 40 W.
Correct Answer: A — 20 W
Learn More →
Q. What is the prefix for 10^6? (2022)
A.
Kilo
B.
Mega
C.
Giga
D.
Tera
Show solution
Solution
The prefix for 10^6 is Mega (M).
Correct Answer: B — Mega
Learn More →
Q. What is the primary active ingredient in aspirin? (2019)
A.
Acetylsalicylic acid
B.
Salicylic acid
C.
Acetic acid
D.
Benzoic acid
Show solution
Solution
Aspirin is chemically known as acetylsalicylic acid, which is used for pain relief and anti-inflammatory purposes.
Correct Answer: A — Acetylsalicylic acid
Learn More →
Q. What is the primary advantage of asexual reproduction? (2022)
A.
Genetic diversity
B.
Rapid population increase
C.
Requires less energy
D.
All of the above
Show solution
Solution
Asexual reproduction allows for rapid population increase as it does not require a mate.
Correct Answer: B — Rapid population increase
Learn More →
Q. What is the primary advantage of sexual reproduction? (2021)
A.
Faster reproduction
B.
Genetic diversity
C.
No need for a mate
D.
Lower energy requirement
Show solution
Solution
Sexual reproduction leads to genetic diversity, which can enhance survival in changing environments.
Correct Answer: B — Genetic diversity
Learn More →
Q. What is the primary application of nuclear fusion? (2023)
A.
Nuclear power plants
B.
Hydrogen bombs
C.
Medical imaging
D.
Smoke detectors
Show solution
Solution
Nuclear fusion is primarily applied in hydrogen bombs, where fusion reactions release immense energy.
Correct Answer: B — Hydrogen bombs
Learn More →
Q. What is the primary application of recombinant DNA technology in agriculture? (2020)
A.
Increased crop yield
B.
Pest resistance
C.
Improved nutritional value
D.
All of the above
Show solution
Solution
Recombinant DNA technology is used to enhance crop yield, provide pest resistance, and improve nutritional value, making option 'All of the above' the correct answer.
Correct Answer: D — All of the above
Learn More →
Q. What is the primary application of recombinant DNA technology in medicine? (2020)
A.
Production of insulin
B.
Gene therapy
C.
Vaccines
D.
All of the above
Show solution
Solution
Recombinant DNA technology is used in various medical applications including the production of insulin, gene therapy, and vaccines.
Correct Answer: D — All of the above
Learn More →
Q. What is the primary basis for the classification of living organisms? (2020)
A.
Habitat
B.
Morphology
C.
Genetic similarity
D.
Size
Show solution
Solution
Genetic similarity is the primary basis for the classification of living organisms.
Correct Answer: C — Genetic similarity
Learn More →
Q. What is the primary benefit of probiotics? (2023)
A.
Increase weight
B.
Improve gut health
C.
Enhance vision
D.
Boost hair growth
Show solution
Solution
Probiotics are beneficial bacteria that improve gut health and aid in digestion.
Correct Answer: B — Improve gut health
Learn More →
Q. What is the primary benefit of using probiotics? (2023)
A.
To cure diseases
B.
To enhance gut health
C.
To increase appetite
D.
To reduce weight
Show solution
Solution
Probiotics are beneficial bacteria that help enhance gut health and improve digestion.
Correct Answer: B — To enhance gut health
Learn More →
Q. What is the primary cause of AIDS? (2020)
A.
Bacteria
B.
Virus
C.
Fungi
D.
Protozoa
Show solution
Solution
AIDS is caused by the Human Immunodeficiency Virus (HIV), which is a virus.
Correct Answer: B — Virus
Learn More →
Q. What is the primary cause of biodiversity loss worldwide? (2020)
A.
Climate change
B.
Habitat destruction
C.
Pollution
D.
Overexploitation
Show solution
Solution
Habitat destruction is the primary cause of biodiversity loss, as it leads to the loss of species and ecosystems.
Correct Answer: B — Habitat destruction
Learn More →
Q. What is the primary cause of tuberculosis? (2020)
A.
Bacteria
B.
Virus
C.
Fungi
D.
Protozoa
Show solution
Solution
Tuberculosis is primarily caused by the bacterium Mycobacterium tuberculosis.
Correct Answer: A — Bacteria
Learn More →
Q. What is the primary characteristic of a K-selected species? (2023)
A.
High reproductive rate
B.
Short lifespan
C.
High parental care
D.
Rapid growth
Show solution
Solution
K-selected species typically exhibit high parental care and invest more resources in fewer offspring.
Correct Answer: C — High parental care
Learn More →
Q. What is the primary characteristic of a redox reaction? (2023)
A.
Transfer of protons
B.
Transfer of electrons
C.
Change in temperature
D.
Change in pressure
Show solution
Solution
The primary characteristic of a redox reaction is the transfer of electrons between species.
Correct Answer: B — Transfer of electrons
Learn More →
Q. What is the primary characteristic of alkaline earth metals? (2020)
A.
They are highly reactive
B.
They have a +2 oxidation state
C.
They are gases at room temperature
D.
They form covalent bonds
Show solution
Solution
Alkaline earth metals typically have a +2 oxidation state due to the loss of two electrons.
Correct Answer: B — They have a +2 oxidation state
Learn More →
Q. What is the primary characteristic of amorphous solids? (2023)
A.
Long-range order
B.
Short-range order
C.
Definite melting point
D.
High thermal conductivity
Show solution
Solution
Amorphous solids have short-range order but lack long-range order, unlike crystalline solids.
Correct Answer: B — Short-range order
Learn More →
Q. What is the primary characteristic that distinguishes living organisms from non-living things? (2020)
A.
Ability to reproduce
B.
Ability to move
C.
Ability to grow
D.
Ability to respond to stimuli
Show solution
Solution
The primary characteristic that distinguishes living organisms from non-living things is their ability to reproduce, which is essential for the continuation of species.
Correct Answer: A — Ability to reproduce
Learn More →
Q. What is the primary component of plasma in blood? (2020)
A.
Water
B.
Proteins
C.
Electrolytes
D.
Nutrients
Show solution
Solution
Plasma is composed of approximately 90% water, which serves as a solvent for various substances in the blood.
Correct Answer: A — Water
Learn More →
Showing 1141 to 1170 of 2832 (95 Pages)