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Physics [1 Mark Question Answer]

Electricity · ICSE STD 10 (ICSE - English Medium). 35 questions.

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[1 Mark Question Answer]

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35 questions · timed · auto-graded

Question 11 Mark
A current of 0.2 A flows through a conducting wire for 5 minutes. How much charge will flow?
Answer
Given: I = 0.2A, t = 5 minute = 5 × 60s = 300s.
Charge Q = I × t = 0.2 × 300 = 60 C.
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Question 21 Mark
Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
Answer
The reason is that when the cell is being used, there is a drop in potential across the internal resistance of the cell.
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Question 31 Mark
What is the colour code for the insulation on the earth wire?
Answer
Earth wire – Insulation is of Green or Yellow colour.
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Question 51 Mark
An electrical gadget can give an electric shock to its user under certain circumstances. Mention any two of these circumstances.
Answer
When the live wire comes in contact with the metal body of the electrical gadget.
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Question 61 Mark
What is non-ohmic resistor?
Answer
This is a resistor which does not obey Ohm’s Laws.
V -1 graph for a non-ohmic resistors is not a straight line.
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Question 71 Mark
Which part of an electrical appliance is earthed?
Answer
Metal body of an electrical appliance is earthed.
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Question 81 Mark
Write an expression for calculating electrical power in terms of current and resistance.
Answer
Electrical power in terms of current and resistance is $P = I^2R.$
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Question 91 Mark
What is consumed while using different electrical appliances, for which electricity bills are paid?
Answer
Electrical energy in kWh which is commercially called a unit of electrical energy.
1 kWh = 1 kW × 1 hr = 1 unit of electricity.
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Question 101 Mark
How should the electric lamps in a building be connected?
Answer
Electric lamps are connected in parallel.
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Question 111 Mark
State the condition when it is advantageous to connect cells in parallel.
Answer
It is advantageous to connect cells in parallel if the internal resistance of each cell is high enough compared to the external resistance.
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Question 121 Mark
State the condition when it is advantageous to connect cells in series.
Answer
It is advantageous to connect cells in series if the external resistance is large enough compared to the total internal resistance of cells.
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Question 141 Mark
State expression for Resistance connected in parallel.
Answer
$\frac{1}{ R }=\frac{1}{ r _1}+\frac{1}{ r _2}+\frac{1}{ r _3}$ resistances in parallel.
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Question 151 Mark
State expression for Resistance connected in series.
Answer
$R = r_1 + r_2 + r_3$​​​​​​​, resistances in series.
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Question 161 Mark
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
Answer
The resistance of the rheostat will not change at all as it does not depend on the voltage applied across it.
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Question 171 Mark
What is meant by internal resistance of a cell?
Answer
The resistance offered by the electrolyte inside the cell to the flow of current is called internal resistance of cell.
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Question 191 Mark
How does the resistivity of an alloy such as constantace depends on temperature.
Answer
The resistivity of an alloy almost remains unaffected with change in tempeature.
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Question 201 Mark
How does the resistivity of a semiconductor depend on temperature?
Answer
The resistivity of a semiconductor decreases with an increase in temperature.
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Question 211 Mark
State the effect of rise in temperature on the resistance of semi-conductors.
Answer
In the case of semi-conductors like carbon, silicon, germanium, etc., the resistance decreases with increase in temperature.
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Question 221 Mark
What material is used for making wire to prepare heating coils? Give a reason.
Answer
Nichrome is used for making wire to prepare heating coils. The reason is that its melting point is high and its resistivity is also high.
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Question 231 Mark
Name the material of wire used for making standard resistances. Give a reason.
Answer
Constantan is used for making standard resistances. The reason is that its resistance remains almost unaffected with change in temperature.
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Question 241 Mark
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
Answer
Metal < Semiconductor < Insulator
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Question 251 Mark
How does the resistance of an alloy, vary with temperature?
Answer
The resistance of an alloy remains nearly unaffected by the change in temperatue.
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Question 261 Mark
How does specific resistance of a semi-conductor change with the increase in temperature?
Answer
Specific resistance of a semiconductor decreases with increase in temperature.
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Question 271 Mark
A given wire is stretched to double its length. How will its resistance change?
Answer
When a given wire is stretched to double its length, its area of cross-section will be halved, so the resistance of wire will become four times.
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Question 281 Mark
How does the resistance of a metallic wire depend on the thickness of wire?
Answer
The resistance of a wire decreases with increase in its thickness ( $R \propto l / a$ where $a=\pi r^2$, the area of cross-section of the wire).
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Question 291 Mark
How does the resistance of a metallic wire depend on the length of wire?
Answer
The resistance of a wire increases with increases in the length of wire (R ∝ l).
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Question 301 Mark
Define the unit of resistance (or Define the unit "ohm").
Answer
One ohm (Ω) is the resistance of a conductor when a potential difference of one volt is applied to its ends and a current of one ampere flows through it.
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Question 311 Mark
What do you understand by the resistance of a wire?
Answer
The obstruction offered in the flow of electrons (or current) by the material of the wire, is called its resistance.
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Question 321 Mark
Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.
Answer
Electrical energy, $W=1^2 R$ t joule
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Question 331 Mark
How is direction of current related to the direction of flow of electrons?
Answer
The direction of current is opposite to the direction of flow of electrons.
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Question 341 Mark
What is the voltage of the electricity that is generally supplied to a house?
Answer
The voltage of the electricity that is generally supplied to a house is 220 Volt
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Question 351 Mark
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
Draw a labelled circuit diagram showing the above arrangement.
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[1 Mark Question Answer] - Physics STD 10 Questions - Vidyadip