Resistance Quiz Questions: Test!
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- 1.
A given wire has resistance R, now it's length is doubled while area gets halved then the new resistance of the wire will be
- A.
Four times increases
- B.
Four times decreases
- C.
Two times increases
- D.
No change in resistance at all
Correct Answer
A. Four times increasesExplanation
When the length of a wire is doubled, its resistance also doubles according to the formula R = ρL/A, where R is resistance, ρ is resistivity, L is length, and A is area. When the area of the wire is halved, the resistance becomes four times its original value. Therefore, the new resistance of the wire will be four times higher than its original resistance.Rate this question:
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- 2.
A wire of resistance R, if it's length is doubles how does the Resistivity of the wire changes
- A.
Resistivity increases two times
- B.
Resistivity decreases two times
- C.
Resistivity increase by four times
- D.
No change in Resistivity at all
Correct Answer
D. No change in Resistivity at allExplanation
When the length of a wire doubles, the resistance of the wire also doubles. However, resistivity is an intrinsic property of the material and is independent of the dimensions of the wire. Resistivity is given by the formula ρ = R(A/L), where R is the resistance, A is the cross-sectional area, and L is the length of the wire. As the length doubles, the resistance doubles, but the cross-sectional area also doubles proportionally, resulting in no change in resistivity. Therefore, the correct answer is "No change in resistivity at all."Rate this question:
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- 3.
Two wires connected to different batteries but of the same voltage if one wire is thicker than the other and current flows through both the wires for the same time, then which wire heats up more.
- A.
The wire which is thinner will heats up more in comparison to wire which is thicker
- B.
Both wires heats up equally
- C.
Thicker wire will heats up more
- D.
Can't say
Correct Answer
A. The wire which is thinner will heats up more in comparison to wire which is thickerExplanation
The wire which is thinner will heat up more because resistance is inversely proportional to the cross-sectional area of the wire. Thinner wires have higher resistance, causing more energy to be dissipated as heat. The thicker wire, with lower resistance, will have less energy dissipated as heat and therefore heat up less.Rate this question:
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- 4.
Choose the correct statement:
- A.
Resistance is independent of temprature
- B.
Resistance is directly propotional to temprature
- C.
Resistance is inversly proportional to temprature
- D.
Resistivity is independent of temprature
Correct Answer
B. Resistance is directly propotional to temprature -
- 5.
Choose the correct relationship from the following:
- A.
H=VIT (wherevH= heat ,I= current ,V= potential Differece,T= time)
- B.
H= VI/T
- C.
H=IT/V
- D.
H= VT/I
Correct Answer
A. H=VIT (wherevH= heat ,I= current ,V= potential Differece,T= time)Explanation
The correct relationship is H = VIT, where H represents heat, I represents current, V represents potential difference, and T represents time. This equation is derived from the formula for calculating heat, which states that heat is equal to the product of current, potential difference, and time.Rate this question:
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- 6.
Choose the correct statement:
- A.
Direction of current is that in which electrons are moving
- B.
Direction of current is from Negative terminal of battery to positive terminal of battery
- C.
Direction of current is taken opposite to direction in which electrons are moving
- D.
None of the above are correct
Correct Answer
C. Direction of current is taken opposite to direction in which electrons are movingExplanation
The correct statement is that the direction of current is taken opposite to the direction in which electrons are moving. This is because historically, when the concept of electric current was first introduced, it was not known that electrons were the actual charge carriers. Instead, it was believed that positive charges were moving. Therefore, the convention was established to consider the direction of current opposite to the actual movement of electrons. This convention is still followed today, even though we now know that electrons are the ones that carry the charge.Rate this question:
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- 7.
The slope of Current versus Voltage graph tells us about:
- A.
Resistance
- B.
Resistivity
- C.
Reciprocal of resistance (1/R)
- D.
Heat produced
Correct Answer
C. Reciprocal of resistance (1/R)Explanation
The slope of the Current versus Voltage graph represents the ratio of the change in current to the change in voltage. In other words, it indicates how much the current changes for a given change in voltage. Since resistance is defined as the ratio of voltage to current (R = V/I), the reciprocal of resistance (1/R) is equal to the slope of the graph. Therefore, the slope of the Current versus Voltage graph tells us about the reciprocal of resistance (1/R).Rate this question:
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- 8.
The correct unit for Potential Difference or Voltage is:
- A.
Joule/Coulmb
- B.
Joule
- C.
Could
- D.
Ohm
Correct Answer
A. Joule/CoulmbExplanation
The correct unit for Potential Difference or Voltage is Joule/Coulomb. This unit represents the amount of work done (measured in Joules) in moving a unit of electric charge (measured in Coulombs) between two points in an electric circuit. It quantifies the energy transfer that occurs when electric charges move from a higher potential to a lower potential. The unit Ohm represents electrical resistance, while Joule and Coulomb are units of energy and charge respectively.Rate this question:
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- 9.
Charge on a body is a:
- A.
Scalar quantity
- B.
Vector quantity
- C.
Can't say anything
- D.
Tensor (both scalar and vector )
Correct Answer
A. Scalar quantityExplanation
Charge on a body is a scalar quantity because it only has magnitude and no direction. Scalar quantities are described by a single value or number, without any associated direction. In the case of charge, it can be positive or negative, but it does not have a specific direction in space. Therefore, it is considered a scalar quantity.Rate this question:
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Mar 21, 2023Quiz Edited by
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Jun 07, 2020Quiz Created by
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