Q. If sin^(-1)(x) + cos^(-1)(x) = π/2, then what is the value of x?
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Solution
Using the identity sin^(-1)(x) + cos^(-1)(x) = π/2, we can conclude that x can take any value in the range [-1, 1].
Correct Answer: A — 0
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Q. If sin^(-1)(x) = π/4, what is the value of x?
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Solution
If sin^(-1)(x) = π/4, then x = sin(π/4) = √2/2.
Correct Answer: B — √2/2
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Q. If tan A = 3/4, what is the value of sin A?
A.
3/5
B.
4/5
C.
5/3
D.
5/4
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Solution
Using the identity tan A = sin A / cos A, we can find sin A = tan A * cos A. Using the Pythagorean identity, we find sin A = 3/5.
Correct Answer: A — 3/5
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Q. If tan θ = 1, what is the value of sin θ?
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Solution
Since tan θ = sin θ / cos θ and tan θ = 1, we have sin θ = cos θ. For θ = 45°, sin θ = 1/√2.
Correct Answer: A — 1/√2
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Q. If tan(x) = 1, what is the value of sin(x) + cos(x)?
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Solution
If tan(x) = 1, then sin(x) = cos(x). Therefore, sin(x) + cos(x) = 2sin(x) = 2(1/√2) = √2.
Correct Answer: A — √2
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Q. If tan(x) = 1, what is the value of x in degrees?
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Solution
tan(45°) = 1, hence x = 45°.
Correct Answer: A — 45
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Q. If tan(x) = 3/4, what is sin(x)?
A.
3/5
B.
4/5
C.
5/3
D.
5/4
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Solution
Using the identity tan(x) = sin(x)/cos(x), we can find sin(x) = 3/5 after applying the Pythagorean theorem.
Correct Answer: A — 3/5
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Q. If tan(x) = 3/4, what is the value of sin(x)?
A.
3/5
B.
4/5
C.
1/5
D.
0
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Solution
Using the identity tan(x) = sin(x)/cos(x), we can find sin(x) = 3/5 after calculating the hypotenuse using the Pythagorean theorem.
Correct Answer: A — 3/5
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Q. If tan(θ) = 1, what is the value of θ in degrees?
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Solution
tan(θ) = 1 at θ = 45°.
Correct Answer: B — 45
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Q. If tan(θ) = 3/4, what is the value of sin(θ)?
A.
3/5
B.
4/5
C.
5/5
D.
1
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Solution
Using the identity sin²(θ) + cos²(θ) = 1, we find sin(θ) = 3/5.
Correct Answer: A — 3/5
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Q. If tan^(-1)(x) = π/4, then the value of x is:
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Solution
tan^(-1)(x) = π/4 implies that x = tan(π/4) = 1.
Correct Answer: B — 1
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Q. If the activation energy of a reaction is increased, what happens to the rate constant k?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
According to the Arrhenius equation, an increase in activation energy results in a decrease in the rate constant k.
Correct Answer: B — Decreases
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Q. If the amplitude of a damped oscillator decreases to half its value in 5 seconds, what is the damping ratio?
A.
0.1
B.
0.2
C.
0.3
D.
0.4
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Solution
Using the formula A(t) = A_0 e^(-ζω_nt), we find ζ = 0.2.
Correct Answer: B — 0.2
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Q. If the amplitude of a simple harmonic motion is doubled, how does the maximum velocity change?
A.
It doubles
B.
It quadruples
C.
It remains the same
D.
It halves
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Solution
Maximum velocity V_max = Aω. If A is doubled, V_max also doubles.
Correct Answer: A — It doubles
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Q. If the amplitude of a simple harmonic motion is doubled, how does the total energy change?
A.
Remains the same
B.
Doubles
C.
Quadruples
D.
Halves
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Solution
The total energy E in SHM is given by E = (1/2)kA². If A is doubled, E becomes (1/2)k(2A)² = 4(1/2)kA², which is quadrupled.
Correct Answer: C — Quadruples
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Q. If the amplitude of a simple harmonic motion is halved, how does the maximum velocity change?
A.
Halved
B.
Doubled
C.
Remains the same
D.
Quadrupled
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Solution
Maximum velocity V_max = ωA. If A is halved, V_max is also halved.
Correct Answer: A — Halved
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Q. If the amplitude of a simple harmonic oscillator is doubled, how does the total energy change?
A.
Remains the same
B.
Doubles
C.
Quadruples
D.
Halves
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Solution
The total energy in simple harmonic motion is proportional to the square of the amplitude. If amplitude is doubled, energy increases by a factor of 2^2 = 4.
Correct Answer: C — Quadruples
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Q. If the amplitude of a simple harmonic oscillator is doubled, what happens to its total energy?
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
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Solution
The total energy of a simple harmonic oscillator is proportional to the square of the amplitude. If the amplitude is doubled, the energy increases by a factor of 2^2 = 4.
Correct Answer: C — It quadruples
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Q. If the amplitude of a simple harmonic oscillator is halved, how does the total energy change?
A.
Remains the same
B.
Halved
C.
Doubled
D.
Quadrupled
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Solution
The total energy in SHM is proportional to the square of the amplitude. If amplitude is halved, energy is reduced to (1/2)^2 = 1/4, which is halved.
Correct Answer: B — Halved
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Q. If the amplitude of a wave is doubled, how does the energy of the wave change?
A.
Remains the same
B.
Doubles
C.
Increases by a factor of four
D.
Increases by a factor of eight
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Solution
The energy of a wave is proportional to the square of the amplitude. If the amplitude is doubled, the energy increases by a factor of 2^2 = 4.
Correct Answer: C — Increases by a factor of four
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Q. If the amplitude of a wave is doubled, what happens to its energy?
A.
Remains the same
B.
Doubles
C.
Increases by a factor of four
D.
Increases by a factor of eight
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Solution
The energy of a wave is proportional to the square of its amplitude. Therefore, if the amplitude is doubled, the energy increases by a factor of four.
Correct Answer: C — Increases by a factor of four
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Q. If the amplitude of a wave is tripled, how does the energy of the wave change?
A.
Increases by a factor of 3
B.
Increases by a factor of 6
C.
Increases by a factor of 9
D.
Remains the same
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Solution
Energy is proportional to the square of the amplitude, so if amplitude is tripled, energy increases by a factor of 3^2 = 9.
Correct Answer: C — Increases by a factor of 9
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Q. If the amplitude of a wave is tripled, what happens to its energy?
A.
Increases by a factor of 3
B.
Increases by a factor of 6
C.
Increases by a factor of 9
D.
Remains the same
Show solution
Solution
The energy of a wave is proportional to the square of its amplitude, so if amplitude is tripled, energy increases by a factor of 3^2 = 9.
Correct Answer: C — Increases by a factor of 9
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Q. If the angle between the current element and the line joining the current element to the point of interest is 90 degrees, what is the contribution of that current element to the magnetic field?
A.
Maximum
B.
Minimum
C.
Zero
D.
Undefined
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Solution
If the angle is 90 degrees, the sine of the angle is zero, resulting in zero contribution to the magnetic field from that current element.
Correct Answer: C — Zero
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Q. If the angle between the force and the lever arm is 90 degrees, how does it affect the torque?
A.
Torque is zero
B.
Torque is maximum
C.
Torque is half
D.
Torque is minimum
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Solution
Torque is maximum when the angle is 90 degrees because τ = F × r × sin(θ) and sin(90°) = 1.
Correct Answer: B — Torque is maximum
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Q. If the angle between the force and the lever arm is 90 degrees, what is the torque produced by a 15 N force applied at a distance of 2 m?
A.
0 Nm
B.
15 Nm
C.
30 Nm
D.
45 Nm
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Solution
Torque (τ) = F × d × sin(θ) = 15 N × 2 m × sin(90°) = 30 Nm.
Correct Answer: C — 30 Nm
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Q. If the angle between the transmission axis of two polarizers is 90 degrees, what is the intensity of light passing through them?
A.
Maximum intensity
B.
Half of the original intensity
C.
Zero intensity
D.
Equal to the intensity of the first polarizer
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Solution
When the angle between the transmission axes of two polarizers is 90 degrees, no light passes through, resulting in zero intensity.
Correct Answer: C — Zero intensity
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Q. If the angle between the transmission axis of two polarizers is 90 degrees, what is the transmitted intensity of light?
A.
Maximum intensity
B.
Half of the original intensity
C.
Zero intensity
D.
One-fourth of the original intensity
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Solution
When the angle between the transmission axes of two polarizers is 90 degrees, no light is transmitted, resulting in zero intensity.
Correct Answer: C — Zero intensity
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Q. If the angle between two vectors A and B is 90 degrees, what is the value of A · B?
A.
1
B.
0
C.
undefined
D.
1/2
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Solution
If the angle is 90 degrees, A · B = |A||B|cos(90) = 0.
Correct Answer: B — 0
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Q. If the angle between vectors A = 2i + 3j and B = 4i + 5j is 60 degrees, find A · B.
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Solution
A · B = |A||B|cos(60°) = √(2^2 + 3^2) * √(4^2 + 5^2) * 1/2 = √13 * √41 * 1/2 = 20.
Correct Answer: B — 25
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