Q. If the relation R on set A = {1, 2, 3} is defined as R = {(1, 1), (2, 2), (3, 3)}, is R reflexive?
A.
Yes
B.
No
C.
Only for 1
D.
Only for 2
Show solution
Solution
A relation is reflexive if every element in the set is related to itself. Here, R includes (1, 1), (2, 2), and (3, 3), so R is reflexive.
Correct Answer:
A
— Yes
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Q. If the relation R on set A = {1, 2, 3} is defined as R = {(1, 2), (2, 3)}, is R reflexive?
A.
Yes
B.
No
C.
Depends on A
D.
None of the above
Show solution
Solution
A relation is reflexive if every element is related to itself. Here, (1,1), (2,2), and (3,3) are not in R, so R is not reflexive.
Correct Answer:
B
— No
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Q. If the relative humidity is 100%, what does it indicate about the air?
A.
Air is saturated
B.
Air is dry
C.
Air is cold
D.
Air is warm
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Solution
A relative humidity of 100% indicates that the air is saturated with moisture.
Correct Answer:
A
— Air is saturated
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Q. If the relative humidity is 80% and the temperature is 25°C, what is the dew point temperature approximately? (2023)
A.
20°C
B.
22°C
C.
18°C
D.
15°C
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Solution
Using a dew point calculator or approximation, the dew point at 80% relative humidity and 25°C is approximately 22°C.
Correct Answer:
B
— 22°C
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Q. If the relative humidity is 80% and the temperature is 30°C, what is the dew point approximately?
A.
25°C
B.
20°C
C.
15°C
D.
10°C
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Solution
Using the formula for dew point, the approximate dew point at 80% humidity and 30°C is around 20°C.
Correct Answer:
B
— 20°C
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Q. If the relative humidity is 80% at a temperature of 25°C, what is the dew point temperature approximately?
A.
20°C
B.
22°C
C.
18°C
D.
15°C
Show solution
Solution
At 25°C and 80% relative humidity, the dew point is approximately 22°C.
Correct Answer:
B
— 22°C
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Q. If the relative humidity of the air is 60% at 25°C, what is the dew point temperature? (2020)
A.
15°C
B.
20°C
C.
10°C
D.
25°C
Show solution
Solution
Using the formula for dew point approximation, Dew Point ≈ T - ((100 - RH) / 5) = 25 - ((100 - 60) / 5) = 25 - 8 = 20°C.
Correct Answer:
B
— 20°C
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Q. If the resistance in a circuit is doubled while keeping the voltage constant, what happens to the current?
A.
It doubles.
B.
It halves.
C.
It remains the same.
D.
It quadruples.
Show solution
Solution
According to Ohm's Law (I = V/R), if resistance (R) is doubled and voltage (V) remains constant, the current (I) will be halved.
Correct Answer:
B
— It halves.
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Q. If the resistance in a circuit is doubled while the voltage remains constant, what happens to the current?
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases exponentially
Show solution
Solution
According to Ohm's law (V = IR), if resistance (R) is doubled and voltage (V) remains constant, the current (I) will be halved.
Correct Answer:
B
— Halves
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Q. If the resistance in one arm of a Wheatstone bridge is increased, what effect does it have on the balance condition?
A.
The bridge will always remain balanced.
B.
The bridge will become unbalanced.
C.
The balance condition will improve.
D.
It has no effect.
Show solution
Solution
Increasing the resistance in one arm will disturb the balance condition, making the bridge unbalanced.
Correct Answer:
B
— The bridge will become unbalanced.
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Q. If the resistance in one arm of a Wheatstone bridge is increased, what happens to the balance condition?
A.
It remains balanced
B.
It becomes unbalanced
C.
It depends on other resistances
D.
It becomes short-circuited
Show solution
Solution
Increasing the resistance in one arm will disturb the balance condition, making it unbalanced.
Correct Answer:
B
— It becomes unbalanced
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Q. If the resistance of a circuit is 10 ohms and the induced EMF is 20 V, what is the induced current?
A.
2 A
B.
0.5 A
C.
10 A
D.
5 A
Show solution
Solution
Using Ohm's law, I = V/R. Here, I = 20 V / 10 Ω = 2 A.
Correct Answer:
A
— 2 A
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Q. If the resistance of a circuit is 10 ohms and the induced EMF is 5 V, what is the induced current? (2022)
A.
0.5 A
B.
1 A
C.
2 A
D.
5 A
Show solution
Solution
Using Ohm's law, I = V/R = 5 V / 10 ohms = 0.5 A.
Correct Answer:
A
— 0.5 A
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Q. If the resistance of a circuit is doubled while keeping the induced EMF constant, what happens to the induced current?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It becomes zero
Show solution
Solution
According to Ohm's law (I = V/R), if the resistance is doubled while the voltage (induced EMF) remains constant, the current will be halved.
Correct Answer:
B
— It halves
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Q. If the resistance of a circuit is doubled while the voltage remains constant, what happens to the current?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Ohm's Law, I = V/R. If R is doubled, the current I will be halved.
Correct Answer:
B
— It halves
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Q. If the resistance of a conductor is doubled while the voltage remains constant, what happens to the current? (2020)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Ohm's Law, if the resistance (R) is doubled and the voltage (V) remains constant, the current (I) will be halved (I = V/R).
Correct Answer:
B
— It halves
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Q. If the resistance of a conductor is doubled, what happens to the current flowing through it when the voltage remains constant? (2022)
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases by 1.5 times
Show solution
Solution
According to Ohm's law, I = V/R. If R is doubled, I will be halved.
Correct Answer:
B
— Halves
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Q. If the resistance of a conductor is doubled, what happens to the current if the voltage remains constant? (2020)
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases four times
Show solution
Solution
According to Ohm's Law, if the resistance is doubled while the voltage remains constant, the current will be halved.
Correct Answer:
B
— Halves
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Q. If the resistance of a wire is 10 ohms and the voltage across it is 20 volts, what is the current flowing through the wire?
A.
2 A
B.
5 A
C.
10 A
D.
20 A
Show solution
Solution
Using Ohm's Law (I = V/R), I = 20 V / 10 Ω = 2 A.
Correct Answer:
A
— 2 A
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Q. If the resistance of a wire is doubled, how does it affect the current flowing through it when connected to a constant voltage source?
A.
Current doubles
B.
Current halves
C.
Current remains the same
D.
Current quadruples
Show solution
Solution
According to Ohm's law, if resistance is doubled and voltage remains constant, current will be halved.
Correct Answer:
B
— Current halves
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Q. If the resistance of a wire is doubled, what happens to the current flowing through it when the voltage remains constant?
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases by 50%
Show solution
Solution
According to Ohm's law, if resistance increases while voltage remains constant, current decreases.
Correct Answer:
B
— Halves
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Q. If the resistance of a wire is doubled, what happens to the current flowing through it if the voltage remains constant?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Ohm's law, if resistance increases while voltage remains constant, current decreases.
Correct Answer:
B
— It halves
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Q. If the resistance of a wire is doubled, what happens to the current if the voltage remains constant? (2021)
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases
Show solution
Solution
According to Ohm's Law (I = V/R), if the resistance (R) is doubled while the voltage (V) remains constant, the current (I) will be halved.
Correct Answer:
B
— Halves
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Q. If the resistance of one arm of a Wheatstone bridge is increased, what effect does it have on the balance condition?
A.
It remains balanced
B.
It becomes unbalanced
C.
It depends on the other resistances
D.
It increases the current
Show solution
Solution
Increasing the resistance in one arm will disturb the balance condition, making the bridge unbalanced.
Correct Answer:
B
— It becomes unbalanced
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Q. If the resistance of one arm of a Wheatstone bridge is increased, what will happen to the balance condition?
A.
The bridge will remain balanced
B.
The bridge will become unbalanced
C.
The bridge will balance at a different point
D.
The bridge will short circuit
Show solution
Solution
Increasing the resistance in one arm will disturb the balance condition, causing the bridge to become unbalanced.
Correct Answer:
B
— The bridge will become unbalanced
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Q. If the resistance of one of the arms in a Wheatstone bridge is increased, what effect does it have on the balance condition?
A.
The bridge remains balanced.
B.
The bridge becomes unbalanced.
C.
The current through the galvanometer increases.
D.
The potential difference across the galvanometer decreases.
Show solution
Solution
Increasing the resistance in one arm disrupts the balance condition, causing the bridge to become unbalanced.
Correct Answer:
B
— The bridge becomes unbalanced.
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Q. If the resistance of one of the resistors in a Wheatstone bridge is changed, what will happen to the balance condition?
A.
It will remain unchanged.
B.
It will become balanced.
C.
It will become unbalanced.
D.
It will depend on the value of the changed resistor.
Show solution
Solution
Changing the resistance of one of the resistors will alter the ratio, thus making the bridge unbalanced.
Correct Answer:
C
— It will become unbalanced.
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Q. If the resistance of the potentiometer wire is increased, what effect does it have on the potential gradient?
A.
It increases.
B.
It decreases.
C.
It remains the same.
D.
It becomes zero.
Show solution
Solution
Increasing the resistance of the potentiometer wire decreases the potential gradient, as the same voltage is now distributed over a higher resistance.
Correct Answer:
B
— It decreases.
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Q. If the resistance of the potentiometer wire is increased, what effect does it have on the measurement accuracy?
A.
Increases accuracy
B.
Decreases accuracy
C.
No effect
D.
Depends on the length of the wire
Show solution
Solution
Increasing the resistance of the potentiometer wire can lead to a larger voltage drop, which may decrease measurement accuracy due to increased error in balancing.
Correct Answer:
B
— Decreases accuracy
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Q. If the resistance P in a Wheatstone bridge is 10 ohms, Q is 15 ohms, R is 5 ohms, and S is 7.5 ohms, what is the condition for the bridge to be balanced?
A.
P/Q = R/S
B.
P/R = Q/S
C.
P/S = Q/R
D.
P + Q = R + S
Show solution
Solution
The condition for balance is P/Q = R/S, which is not satisfied here.
Correct Answer:
A
— P/Q = R/S
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