Q. What is the power dissipated in a 10Ω resistor carrying a current of 2A?
-
A.
20W
-
B.
30W
-
C.
40W
-
D.
50W
Solution
Power P = I^2 * R = (2A)^2 * 10Ω = 4 * 10 = 40W.
Correct Answer: A — 20W
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Q. What is the power dissipated in a 4 ohm resistor carrying a current of 3 A?
-
A.
12 W
-
B.
9 W
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C.
6 W
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D.
3 W
Solution
Using the power formula P = I^2 * R, we have P = (3 A)^2 * 4 ohms = 9 * 4 = 36 W.
Correct Answer: A — 12 W
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Q. What is the power dissipated in a resistor of 10 ohms carrying a current of 2 A?
-
A.
20 W
-
B.
10 W
-
C.
5 W
-
D.
40 W
Solution
Using the power formula P = I^2 * R, we have P = (2 A)^2 * 10 ohms = 4 * 10 = 40 W.
Correct Answer: A — 20 W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 2A?
-
A.
5W
-
B.
10W
-
C.
20W
-
D.
40W
Solution
Power is given by P = I^2 * R = (2A)^2 * 5Ω = 4A^2 * 5Ω = 20W.
Correct Answer: B — 10W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 3A?
Solution
Power P = I^2 * R = (3A)^2 * 5Ω = 9A^2 * 5Ω = 45W.
Correct Answer: A — 15W
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Q. What is the power dissipated in a resistor of 8Ω when a current of 2A flows through it?
-
A.
4W
-
B.
8W
-
C.
16W
-
D.
32W
Solution
Power P = I^2 * R = (2A)^2 * 8Ω = 4A^2 * 8Ω = 32W.
Correct Answer: C — 16W
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Q. What is the power factor in a circuit with a phase angle of 60 degrees?
-
A.
0.5
-
B.
0.866
-
C.
1
-
D.
0
Solution
The power factor is cos(60°) = 0.5.
Correct Answer: B — 0.866
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Q. What is the power factor of a circuit with a phase angle of 60 degrees?
-
A.
0.5
-
B.
0.866
-
C.
1
-
D.
0.707
Solution
The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.
Correct Answer: B — 0.866
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Q. What is the power factor of an AC circuit with a phase angle of 60 degrees?
-
A.
0.5
-
B.
0.866
-
C.
1
-
D.
0.707
Solution
The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.
Correct Answer: B — 0.866
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Q. What is the power of a lens with a focal length of 50 cm?
-
A.
+2 D
-
B.
+1 D
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C.
-2 D
-
D.
-1 D
Solution
Power (P) is given by P = 1/f (in meters). Thus, f = 50 cm = 0.5 m, so P = 1/0.5 = +2 D.
Correct Answer: A — +2 D
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Q. What is the power set of A = {a, b}?
-
A.
{∅, {a}, {b}, {a, b}}
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B.
{a, b}
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C.
{∅, {a, b}}
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D.
{a, b, {a, b}}
Solution
The power set of a set is the set of all its subsets. For A = {a, b}, the power set is {∅, {a}, {b}, {a, b}}.
Correct Answer: A — {∅, {a}, {b}, {a, b}}
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Q. What is the power set of the empty set ∅?
-
A.
{∅}
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B.
{∅, {∅}}
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C.
∅
-
D.
{∅, ∅}
Solution
The power set of the empty set contains only the empty set itself: {∅}.
Correct Answer: A — {∅}
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Q. What is the power set of the set F = {a}?
-
A.
{∅, {a}}
-
B.
{∅, a}
-
C.
{a}
-
D.
{∅}
Solution
The power set of F = {a} is {∅, {a}}.
Correct Answer: A — {∅, {a}}
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Q. What is the power set of the set G = {1}?
-
A.
{∅, {1}}
-
B.
{1}
-
C.
{∅}
-
D.
{1, ∅}
Solution
The power set of G = {1} is {∅, {1}}.
Correct Answer: A — {∅, {1}}
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Q. What is the power set of the set {1, 2}?
-
A.
{∅, {1}, {2}, {1, 2}}
-
B.
{∅, {1, 2}}
-
C.
{1, 2}
-
D.
{1, 2, ∅}
Solution
The power set of a set with n elements has 2^n elements. For {1, 2}, the power set is {∅, {1}, {2}, {1, 2}}.
Correct Answer: A — {∅, {1}, {2}, {1, 2}}
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Q. What is the prefix for 10^-6 in the SI system?
-
A.
Milli
-
B.
Micro
-
C.
Nano
-
D.
Pico
Solution
The prefix for 10^-6 is 'Micro'.
Correct Answer: B — Micro
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Q. What is the primary active ingredient in most antacids?
-
A.
Calcium carbonate
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B.
Magnesium hydroxide
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C.
Aluminum hydroxide
-
D.
All of the above
Solution
Most antacids contain active ingredients like calcium carbonate, magnesium hydroxide, or aluminum hydroxide to neutralize stomach acid.
Correct Answer: D — All of the above
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Q. What is the primary advantage of using digital signals over analog signals in communication systems?
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A.
Higher bandwidth
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B.
Less susceptibility to noise
-
C.
Easier to modulate
-
D.
Lower power consumption
Solution
Digital signals are less susceptible to noise, making them more reliable for communication compared to analog signals.
Correct Answer: B — Less susceptibility to noise
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Q. What is the primary application of nuclear fusion in stars?
-
A.
Energy production
-
B.
Nuclear weapons
-
C.
Radioactive dating
-
D.
Medical imaging
Solution
Nuclear fusion in stars primarily serves as a source of energy production, converting hydrogen into helium and releasing vast amounts of energy.
Correct Answer: A — Energy production
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Q. What is the primary assumption of the kinetic theory of gases regarding the motion of gas molecules?
-
A.
Gas molecules are stationary.
-
B.
Gas molecules move in straight lines until they collide.
-
C.
Gas molecules are always in a state of vibration.
-
D.
Gas molecules have a fixed volume.
Solution
The kinetic theory assumes that gas molecules move in straight lines until they collide with each other or the walls of the container.
Correct Answer: B — Gas molecules move in straight lines until they collide.
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Q. What is the primary bond type in polymers?
-
A.
Ionic bonds
-
B.
Covalent bonds
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C.
Metallic bonds
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D.
Hydrogen bonds
Solution
Covalent bonds are the primary bond type in polymers, linking monomers together.
Correct Answer: B — Covalent bonds
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Q. What is the primary cause of buoyancy in fluids?
-
A.
Surface tension
-
B.
Pressure difference
-
C.
Viscosity
-
D.
Density
Solution
Buoyancy is primarily caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of capillary action in liquids?
-
A.
Cohesion
-
B.
Adhesion
-
C.
Viscosity
-
D.
Density
Solution
Capillary action is primarily caused by adhesion, where the liquid molecules are attracted to the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of global warming?
-
A.
Deforestation
-
B.
Greenhouse gas emissions
-
C.
Ozone depletion
-
D.
Acid rain
Solution
Greenhouse gas emissions, particularly CO2, are the primary cause of global warming.
Correct Answer: B — Greenhouse gas emissions
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Q. What is the primary cause of ocean acidification?
-
A.
Plastic pollution
-
B.
Increased CO2 absorption
-
C.
Heavy metal contamination
-
D.
Thermal pollution
Solution
Ocean acidification is primarily caused by the increased absorption of CO2 from the atmosphere into ocean waters.
Correct Answer: B — Increased CO2 absorption
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Q. What is the primary cause of surface tension in liquids?
-
A.
Cohesive forces
-
B.
Adhesive forces
-
C.
Gravitational forces
-
D.
Electromagnetic forces
Solution
Surface tension is primarily caused by cohesive forces between liquid molecules, which create a 'skin' at the surface.
Correct Answer: A — Cohesive forces
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Q. What is the primary cause of the greenhouse effect?
-
A.
Ozone depletion
-
B.
Increased solar radiation
-
C.
Trapping of heat by greenhouse gases
-
D.
Deforestation
Solution
The greenhouse effect is primarily caused by the trapping of heat in the Earth's atmosphere by greenhouse gases.
Correct Answer: C — Trapping of heat by greenhouse gases
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Q. What is the primary cause of the phenomenon known as capillarity?
-
A.
Cohesion
-
B.
Adhesion
-
C.
Viscosity
-
D.
Density
Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of the phenomenon of buoyancy?
-
A.
Surface tension
-
B.
Pressure difference
-
C.
Viscosity
-
D.
Density
Solution
Buoyancy is caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of the phenomenon of capillarity?
-
A.
Cohesion
-
B.
Adhesion
-
C.
Viscosity
-
D.
Density
Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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