Q. In a certain number system, the number '101' represents the decimal number 5. What does '110' represent in the same system?
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Solution
'101' in binary is 5 in decimal. '110' in binary is 6 in decimal.
Correct Answer: B — 7
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Q. In a certain number system, the number '101' represents the decimal number 5. What does '111' represent in the same system?
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Solution
'101' in binary is 5, so '111' in binary is 7.
Correct Answer: B — 7
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Q. In a certain number system, the number '123' represents the decimal number 27. What is the base of this number system?
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Solution
In base 5, '123' = 1*25 + 2*5 + 3 = 27.
Correct Answer: C — 5
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Q. In a certain number system, the number '210' represents the decimal number 42. What is the decimal equivalent of '102' in the same system?
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Solution
'210' in base 3 is 2*3^2 + 1*3^1 + 0*3^0 = 18 + 3 + 0 = 21. Therefore, '102' in base 3 is 1*3^2 + 0*3^1 + 2*3^0 = 9 + 0 + 2 = 11.
Correct Answer: A — 20
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Q. In a certain number system, the number 'A' represents 10. What is the value of 'B' if 'B' represents 11?
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Solution
'B' represents 11 in the same system where 'A' is 10.
Correct Answer: B — 11
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Q. In a certain number system, the number 12 is represented as 'A' and the number 18 as 'B'. If 'A' is a factor of 'B', which of the following statements is true?
A.
A is greater than B
B.
B is a multiple of A
C.
A and B are equal
D.
A is a multiple of B
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Solution
'B' (18) is a multiple of 'A' (12) since 18 can be expressed as 12 multiplied by 1.5.
Correct Answer: B — B is a multiple of A
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Q. In a certain number, if 12 is added to it, the result is a multiple of 5. What can be inferred about the original number?
A.
It is a multiple of 5.
B.
It is a multiple of 12.
C.
It is one less than a multiple of 5.
D.
It is one more than a multiple of 5.
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Solution
If the original number is x, then x + 12 is a multiple of 5. This implies that x must be one more than a multiple of 5.
Correct Answer: D — It is one more than a multiple of 5.
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Q. In a certain numeral system, the number '123' represents the decimal number 27. What is the value of '321' in the same system?
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Solution
'123' in base 3 = 1*3^2 + 2*3^1 + 3*3^0 = 27. '321' in base 3 = 3*3^2 + 2*3^1 + 1*3^0 = 81.
Correct Answer: B — 81
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Q. In a certain polygon, the exterior angle at each vertex measures 45 degrees. How many sides does this polygon have?
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Solution
The sum of the exterior angles of any polygon is 360 degrees. If each exterior angle is 45 degrees, the number of sides is 360 / 45 = 8.
Correct Answer: C — 8
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Q. In a certain state, the ratio of the number of MLAs to the number of MPs is 5:1. If there are 30 MPs, how many MLAs are there?
A.
150
B.
120
C.
100
D.
180
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Solution
If the ratio is 5:1 and there are 30 MPs, then MLAs = 5 * 30 = 150.
Correct Answer: A — 150
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Q. In a certain town, the ratio of the number of men to women is 3:2. If there are 120 men, how many women are there?
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Solution
If the ratio of men to women is 3:2, then for every 3 men, there are 2 women. If there are 120 men, we can set up the proportion: 3/2 = 120/x. Solving for x gives x = 80. Therefore, there are 80 women.
Correct Answer: A — 80
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Q. In a certain town, the ratio of the number of men to women is 3:4. If there are 120 men, how many women are there?
A.
80
B.
90
C.
100
D.
110
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Solution
If the ratio of men to women is 3:4, then for every 3 men, there are 4 women. If there are 120 men, we can set up the proportion: 3/4 = 120/x. Cross-multiplying gives us 3x = 480, so x = 160. Therefore, there are 160 women.
Correct Answer: C — 100
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Q. In a certain year, the Parliament passed 150 bills. If 60% of these bills were passed in the Lok Sabha, how many bills were passed in the Lok Sabha?
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Solution
Bills passed in Lok Sabha = 60% of 150 = 0.6 * 150 = 90.
Correct Answer: A — 90
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Q. In a chemical reaction, if the enthalpy change is positive, the reaction is classified as:
A.
Exothermic
B.
Endothermic
C.
Isothermal
D.
Adiabatic
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Solution
A positive enthalpy change indicates that the reaction absorbs heat, classifying it as endothermic.
Correct Answer: B — Endothermic
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Q. In a chemical reaction, if the enthalpy of products is less than that of reactants, what can be concluded?
A.
The reaction is endothermic
B.
The reaction is exothermic
C.
The reaction is at equilibrium
D.
The reaction is spontaneous
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Solution
If the enthalpy of products is less, the reaction releases heat, indicating it is exothermic.
Correct Answer: B — The reaction is exothermic
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Q. In a chemical reaction, what does the term 'activation energy' refer to? (2023)
A.
Energy released during the reaction
B.
Energy required to initiate the reaction
C.
Energy needed to maintain the reaction
D.
Energy that is lost
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Solution
Activation energy is the minimum energy required to initiate a chemical reaction.
Correct Answer: B — Energy required to initiate the reaction
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Q. In a chess tournament, each player plays every other player exactly once. If there are 10 players, how many games are played?
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Solution
The number of games played is given by n(n-1)/2. For 10 players, it is 10(10-1)/2 = 45.
Correct Answer: A — 45
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Q. In a chess tournament, each player plays every other player once. If there are 12 players, how many games are played?
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Solution
The number of games played is given by n(n-1)/2. For 12 players, it is 12(12-1)/2 = 66 games.
Correct Answer: A — 66
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Q. In a circle, if an angle subtended by an arc at the center is 80 degrees, what is the angle subtended by the same arc at any point on the circumference?
A.
20 degrees
B.
40 degrees
C.
80 degrees
D.
160 degrees
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Solution
The angle subtended at the circumference is half the angle subtended at the center. Therefore, the angle at the circumference is 80/2 = 40 degrees.
Correct Answer: B — 40 degrees
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Q. In a circle, if the angle subtended by an arc at the center is 60 degrees, what is the angle subtended at any point on the circumference?
A.
30 degrees
B.
60 degrees
C.
90 degrees
D.
120 degrees
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Solution
The angle subtended at the circumference is half of that at the center, so it is 30 degrees.
Correct Answer: A — 30 degrees
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Q. In a circle, if the angle subtended by an arc at the center is 60 degrees, what is the angle subtended at any point on the remaining part of the circle?
A.
30 degrees
B.
60 degrees
C.
90 degrees
D.
120 degrees
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Solution
The angle subtended at the circumference is half of that at the center, so it is 30 degrees.
Correct Answer: A — 30 degrees
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Q. In a circle, if the length of an arc is 10 cm and the radius is 5 cm, what is the angle in radians subtended by the arc at the center? (2021)
A.
1 rad
B.
2 rad
C.
3 rad
D.
4 rad
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Solution
The angle in radians is given by the formula θ = s/r, where s is the arc length. Thus, θ = 10/5 = 2 rad.
Correct Answer: B — 2 rad
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Q. In a circle, if the radius is increased by 50%, what happens to the area?
A.
Increases by 25%
B.
Increases by 50%
C.
Increases by 75%
D.
Increases by 125%
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Solution
If the radius increases by 50%, the new radius is 1.5r. The area becomes π(1.5r)² = 2.25πr², which is an increase of 125%.
Correct Answer: D — Increases by 125%
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Q. In a circuit with a 10V battery and two resistors (3Ω and 6Ω) in series, what is the voltage drop across the 6Ω resistor?
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Solution
Voltage drop across R2 = (R2 / (R1 + R2)) * Vtotal = (6 / (3 + 6)) * 10 = 6.67V.
Correct Answer: C — 6V
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Q. In a circuit with a 10V battery and two resistors in parallel (4Ω and 6Ω), what is the voltage across each resistor?
A.
10V for both
B.
5V for both
C.
10V for 4Ω and 6V for 6Ω
D.
10V for 6Ω and 4V for 4Ω
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Solution
In a parallel circuit, the voltage across each resistor is the same as the source voltage. Therefore, both resistors have 10V across them.
Correct Answer: A — 10V for both
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Q. In a circuit with a 10V battery and two resistors in series (2Ω and 3Ω), what is the voltage drop across the 3Ω resistor?
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Solution
Using the voltage divider rule, V3 = (R3 / (R2 + R3)) * Vtotal = (3 / (2 + 3)) * 10 = 6V.
Correct Answer: B — 6V
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Q. In a circuit with a 10V battery and two resistors in series (R1 = 2Ω, R2 = 3Ω), what is the current flowing through the circuit?
A.
2A
B.
1A
C.
0.5A
D.
3A
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Solution
Total resistance R_total = R1 + R2 = 2Ω + 3Ω = 5Ω. Current I = V / R_total = 10V / 5Ω = 2A.
Correct Answer: B — 1A
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Q. In a circuit with a 10V battery and two resistors in series (R1 = 2Ω, R2 = 8Ω), what is the current flowing through the circuit?
A.
0.5A
B.
1A
C.
2A
D.
5A
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Solution
Total resistance R_total = R1 + R2 = 2Ω + 8Ω = 10Ω. Current I = V/R = 10V/10Ω = 1A.
Correct Answer: B — 1A
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Q. In a circuit with a 10V battery and two resistors of 5 ohms each in series, what is the current flowing through the circuit?
A.
1 A
B.
2 A
C.
0.5 A
D.
5 A
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Solution
Total resistance R_total = 5 + 5 = 10 ohms. Current I = V/R_total = 10V / 10 ohms = 1 A.
Correct Answer: B — 2 A
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Q. In a circuit with a 10V battery and two resistors of 5Ω each in series, what is the voltage across the second resistor?
A.
5V
B.
10V
C.
2.5V
D.
0V
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Solution
In series, the voltage is divided equally: V2 = (R2 / (R1 + R2)) * Vtotal = (5 / (5 + 5)) * 10 = 5V.
Correct Answer: A — 5V
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