Q. If the emf of a cell is 12 V and the potentiometer wire is 20 m long, what is the potential gradient if the wire is calibrated to give a reading of 0.6 V/m?
A.
12 V
B.
0.6 V/m
C.
0.3 V/m
D.
0.5 V/m
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Solution
The potential gradient is given as 0.6 V/m, which is the calibration value for the potentiometer.
Correct Answer: B — 0.6 V/m
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Q. If the emf of a cell is 2V and the potential gradient of the potentiometer wire is 4 V/m, what will be the balancing length?
A.
0.5 m
B.
1 m
C.
0.25 m
D.
0.75 m
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Solution
The balancing length is calculated as L = V / (potential gradient) = 2V / 4 V/m = 0.5 m.
Correct Answer: B — 1 m
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Q. If the enthalpy of a system increases, the process is considered _____.
A.
exothermic
B.
endothermic
C.
isothermal
D.
adiabatic
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Solution
If the enthalpy of a system increases, the process is considered endothermic.
Correct Answer: B — endothermic
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Q. If the enthalpy of a system increases, what can be inferred about the system?
A.
It is losing heat
B.
It is gaining heat
C.
It is at equilibrium
D.
It is undergoing a phase change
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Solution
An increase in enthalpy indicates that the system is gaining heat.
Correct Answer: B — It is gaining heat
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Q. If the enthalpy of reaction is -100 kJ, what can be said about the reaction?
A.
It absorbs heat
B.
It releases heat
C.
It is at equilibrium
D.
It requires energy input
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Solution
A negative enthalpy change indicates that the reaction releases heat, making it exothermic.
Correct Answer: B — It releases heat
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Q. If the entropy of a system increases, what can be inferred about the spontaneity of the process?
A.
The process is non-spontaneous
B.
The process is spontaneous
C.
The process is at equilibrium
D.
None of the above
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Solution
An increase in entropy indicates that the process is spontaneous, as per the second law of thermodynamics.
Correct Answer: B — The process is spontaneous
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Q. If the entropy of a system increases, what is the effect on Gibbs Free Energy at constant temperature?
A.
ΔG increases
B.
ΔG decreases
C.
ΔG remains constant
D.
ΔG becomes zero
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Solution
If entropy increases, ΔG decreases, making the reaction more favorable.
Correct Answer: B — ΔG decreases
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Q. If the equation 2x + 3 = 11 is solved for x, what is the value of x?
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Solution
To solve for x, subtract 3 from both sides to get 2x = 8, then divide by 2 to find x = 4.
Correct Answer: C — 4
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Q. If the equation 2x + 3y = 6 is transformed into slope-intercept form, what is the slope of the line?
A.
-2
B.
2
C.
-3/2
D.
3/2
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Solution
Rearranging the equation to y = -2/3x + 2 shows that the slope is -2/3.
Correct Answer: C — -3/2
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Q. If the equation 2x^2 + 3x + k = 0 has one root equal to 1, what is the value of k?
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Solution
Substituting x = 1 gives 2(1)^2 + 3(1) + k = 0 => 2 + 3 + k = 0 => k = -5.
Correct Answer: A — -1
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Q. If the equation 2x^2 + 3x + k = 0 has roots 1 and -2, what is the value of k?
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Solution
Using Vieta's formulas, k = 2*1*(-2) = -4.
Correct Answer: D — 4
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Q. If the equation 2x^2 + 3x - 5 = 0 has roots r1 and r2, what is the value of r1 + r2?
A.
-3/2
B.
3/2
C.
5/2
D.
-5/2
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Solution
Using Vieta's formulas, r1 + r2 = -b/a = -3/2.
Correct Answer: A — -3/2
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Q. If the equation of a line is given as 2x - 3y + 6 = 0, what is the y-intercept of the line?
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Solution
To find the y-intercept, set x = 0. The equation becomes -3y + 6 = 0, leading to y = 2.
Correct Answer: B — 2
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Q. If the equation of a line is given as y = mx + b, what does 'm' represent?
A.
The y-intercept
B.
The x-intercept
C.
The slope of the line
D.
The constant term
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Solution
'm' represents the slope of the line in the slope-intercept form of a linear equation.
Correct Answer: C — The slope of the line
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Q. If the equation of a line is y = -1/2x + 3, what is the x-intercept?
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Solution
To find the x-intercept, set y = 0. The equation becomes 0 = -1/2x + 3, leading to x = 6.
Correct Answer: A — 6
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Q. If the equation of a line is y = -1/2x + 3, what is the y-value when x = 4?
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Solution
Substituting x = 4 into the equation gives y = -1/2(4) + 3 = -2 + 3 = 1.
Correct Answer: B — 2
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Q. If the equation of a line is y = mx + c, what does 'm' represent?
A.
The y-intercept
B.
The slope
C.
The x-intercept
D.
The distance
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Solution
'm' in the equation of a line represents the slope, which indicates the steepness and direction of the line.
Correct Answer: B — The slope
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Q. If the equation of a parabola is given by y^2 = 12x, what is the value of 'p'?
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Solution
In the equation y^2 = 4px, p = 3, hence the value of 'p' is 3.
Correct Answer: B — 6
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Q. If the equation of an ellipse is 9x^2 + 16y^2 = 144, what are the lengths of the semi-major and semi-minor axes?
A.
3, 4
B.
4, 3
C.
6, 8
D.
8, 6
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Solution
Rewriting the equation in standard form gives (x^2/16) + (y^2/9) = 1, so semi-major axis a = 4 and semi-minor axis b = 3.
Correct Answer: A — 3, 4
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Q. If the equation x^2 + px + q = 0 has roots 2 and 3, what is the value of p?
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Solution
Using Vieta's formulas, p = -(2 + 3) = -5.
Correct Answer: A — -5
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Q. If the equation x^2 - 5x + k = 0 has equal roots, what is the value of k?
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Solution
For equal roots, the discriminant must be zero. Thus, (-5)^2 - 4*1*k = 0 => 25 - 4k = 0 => k = 25/4 = 6.25.
Correct Answer: A — 5
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Q. If the equilibrium constant Kc for a reaction is 10 at a certain temperature, what is the value of Kc for the reverse reaction?
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Solution
The equilibrium constant for the reverse reaction is the reciprocal of the forward reaction, so Kc' = 1/Kc = 0.1.
Correct Answer: A — 0.1
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Q. If the equilibrium constant Kc for a reaction is 10, what can be said about the position of equilibrium?
A.
Products are favored
B.
Reactants are favored
C.
Equilibrium is at the center
D.
No conclusion can be drawn
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Solution
A Kc value greater than 1 indicates that the products are favored at equilibrium.
Correct Answer: A — Products are favored
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Q. If the equilibrium constant Kc for a reaction is 10, what is the value of Kc for the reverse reaction? (2020)
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Solution
For the reverse reaction, Kc is the reciprocal of the forward reaction. Therefore, Kc (reverse) = 1/Kc (forward) = 1/10 = 0.1.
Correct Answer: A — 0.1
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Q. If the equilibrium constant Kc for a reaction is less than 1, what does it indicate about the equilibrium position?
A.
Products are favored
B.
Reactants are favored
C.
Equal amounts of reactants and products
D.
Reaction does not occur
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Solution
A Kc value less than 1 indicates that at equilibrium, the concentration of reactants is greater than that of products, thus reactants are favored.
Correct Answer: B — Reactants are favored
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Q. If the expansion of (x + a)^n has a term 15x^3a^2, what is the value of n?
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Solution
The term is given by C(n, 3) * a^2 * x^3. Setting C(n, 3) * a^2 = 15 gives n = 6.
Correct Answer: B — 6
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Q. If the expansion of (x + y)^n contains a term with x^4y^2, what can be inferred about the value of n?
A.
n must be 6.
B.
n must be greater than 6.
C.
n must be less than 6.
D.
n can be any integer.
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Solution
In the term x^4y^2, the sum of the exponents (4 + 2) must equal n, hence n = 6.
Correct Answer: A — n must be 6.
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Q. If the expansion of (x + y)^n contains a term with x^4y^3, what can be inferred about n?
A.
n must be 7.
B.
n must be greater than 7.
C.
n must be less than 7.
D.
n can be any integer.
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Solution
The sum of the exponents in the term x^4y^3 is 4 + 3 = 7, hence n must be 7.
Correct Answer: A — n must be 7.
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Q. If the exterior angle of a regular polygon is 30 degrees, how many sides does it have?
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Solution
The sum of the exterior angles of any polygon is 360 degrees. Therefore, the number of sides can be calculated as 360 / 30 = 12.
Correct Answer: B — 12
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Q. If the family of curves is given by y = k/x, what type of curves does it represent?
A.
Linear
B.
Hyperbolic
C.
Circular
D.
Exponential
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Solution
The equation y = k/x represents a family of hyperbolas.
Correct Answer: B — Hyperbolic
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