Answer: i) Current through 5 ohm resistor =V/R= 2A ii) Current through R = 2A because 5 ohm resistor and R are connected in series
(a) False. The instantaneous acceleration of a rolling object will have a value that is not zero. (b) True. Because the frictional force is zero during perfect rolling, no work is done against it.
Answer: b) Rupees 24 is the correct answer. It is assumed that the cost of electrical energy is rupees 4 per kWh. The duration of the event is 3 hours. The electric heater has a 2kW output. We can...
Answer: b) 850W is the proper option. The electric irons we use in our homes have a power rating of 850W.
and radius 
is rolling perfectly on a plane of inclination 
The coefficient of static friction 
. If the inclination 
of the plane is increased, at what value of does the cylinder begin to skid, and not roll perfectly?The given situation can be depicted as: Mass is given as $m=10 \mathrm{~kg}$ Radius is given as $r=15 \mathrm{~cm}=0.15 \mathrm{~m}$ Co-efficient of kinetic friction is given as $\mu_{s}=0.25$ Angle...
Answer: d) Watt is the correct answer. The watt is the unit of measurement for electric power.
Answer: b) 6W is the correct option P = VI is the formula for calculating power Substituting the values of V and I, we get P = 6W.
Answer: The resistances R1 and R2 are linked in series with a V volt battery in the circuit above. Let V1 be the potential difference between R1 and V2 be the potential difference between R2. ...
Answer: The correct option is c) Temperature . Reason : The resistivity or specific resistance of a material is an intensive property (property which does not depend on the system size or the amount...
Answer: c) One kilowatt hour is the amount of energy utilised by an electrical equipment with a power of one kilowatt for one hour. d) Given in the question, P = 500W = 0.5kW T = 20 hour Thus,...
are placed on a horizontal table simultaneously, with an initial angular speed equal to 
. Which of the two will start to roll earlier? The coefficient of kinetic friction is 
The radius of the ring and the disc is given as r = 10 cm = 0.10 m Initial angular speed is given as ω0 =10 π rad s–1 The coefficient of kinetic friction is given as μk = 0.2 According to Newton’s...
Answer: The correct option is b) half Reason: Resistance is inversaly proportional to (A) Area (cross sectionsl area of conductor) . R∝ 1/A So when A Doubled then Resistance became half .
Answer: Total current flowing through circuit, I = 6A R1 = 3 Ω R2 = 6 Ω Combined resistance R is 1/R = 1/3 + 1/6 = 3/6 R = 2 Ω Potential difference across the combined resistance = IR = 12V...
Answer: Total current flowing through circuit, I = 6A R1 = 3 Ω R2 = 6 Ω Combined resistance R is 1/R = 1/3 + 1/6 = 3/6 R = 2 Ω Potential difference across the combined resistance = IR = 12V a)...
Answer: a) The rate at which electrical energy is consumed is referred to as electric power. It is given as: P = VI = watt b) Given in the question, V =...
Answer: The correct option is d) A semiconductor . Reason : The resistivity of a certain material is 0.6 Ωm. The material is most likely to be a semiconductor because it has moderate...
is placed lightly (without any translational push) on a perfectly frictionless table. The radius of the disc is R. What are the linear velocities of the points 
and 
on the disc shown in Figure. Will the disc roll in the direction indicated?Solution: The respective linear velocities are : For point $A, v_{A}=r \omega_{0}$ For point $B, v_{B}=r \omega_{0}$ both in the direction of arrow For point $C, v_{c}=(R / 2) \omega_{0}$ in the...
answer: Given that Total current flowing through circuit, I = 6A R1 = 3 Ω R2 = 6 Ω a) Combined resistance R is 1/R = 1/3 + 1/6 = 3/6 R = 2 Ω b) Potential difference across the combined resistance =...
Answer: The correct option is a) four times. Reason : Resistance of the wire is given by: R = ρ lA When the diameter is halved: d'=d2 Radius: r'=r2 Area of cross-section: A'=πr'2=πr22=πr24=A4 Area...
in the 
plane from an axis through the origin and perpendicular to the plane is 
.
.(a) The moment of inertia of a planar body (lamina) about an axis perpendicular to its plane is equal to the sum of the moments of inertia of the lamina about any two mutually perpendicular axes in...
Effective resistance = R1+R2=20 + 20 = 40 ohms a) Current flowing through the circuit = I = V/R = 5/40 = 0.125amp b) Potential difference across each resistance = IR = 2.5V
Answer: a) b) Effective resistance = R1+R2=20 + 20 = 40 ohms
Answer: Given in the question, V = 230V I = 0.4amp We have to find the rate at which electrical energy is transferred i.e., Power We know that, P = VI Substituting the values of V & I, we get P...
Answer: Given, V = 6V R1 = 2Ω R2 = 3 Ω Effective resistance = R 1/R = ½ + 1/3 1/R = 5/6 R = 1.2 Ω Current flowing through battery, I = V/R = 6/1.2 = 5A
Answer: Given in the question, I = 13amp V = 230V We know that, P = VI Substituting the values of V & I, we get P = 2.99kW
answer: Given, V = 6V R1 = 2Ω R2 = 3 Ω a)Because of its lower resistance, 2 ohm resistance has a larger share of current. b) Effective resistance = R 1/R = ½ + 1/3 1/R = 5/6 R = 1.2...
Answer: The correct option is c) 60 Ω. Reason : If the resistance of a certain copper wire is 1 Ω, the resistance of a similar nichrome wire will be about 60 Ω because the resistivity of nichrome is...
Answer: Given, V = 6V R1 = 2Ω R2 = 3 Ω a) Resistors are connected in parallel b) The potential difference across each resistor is equivalent to...
Answer: In parallel, 4 and 2 coils are connected. As a result, the total resistance, R 1/R = ¼ + ½ = ¾ R = ¾ Ω Total current,, I = V/R = 3 Ω V/(4/3) = 3...
Answer: The correct option is d) 30Ω Reason : We know that R = ρl/A Substituting the values in the above equation we get 30Ω.
Answer: d) 7 (1/2) is the correct answer. When combining resistors, the series and parallel combination formula must be employed. A parallel combination of 6 and 2 resistors is used....
Answer: The correct option is d) one-fourth Reason: We know that R = ρl/A Therefore, when the diameter of the wire is doubled, the resistance becomes one-fourth of the actual value.
and speed 
is fired into a door and gets embedded exactly at the centre of the door. The door is 
wide and weighs 
. It is hinged at one end and rotates about a vertical axis practically without friction. Find the angular speed of the door just after the bullet embeds into it.Velocity is given as v = 500 m/s Mass of bullet is given as m = 10 g or 10 × 10–3 kg The width of the door is given as L = 1 m The radius of the door is given as r = 1 / 2 Mass of the door is given...
Answer: It is given for heater, P = 2kWh T = 4 hours Thus, Energy consumed will be E1, PT = 8kWh It is given for TV, P = 200 watt = 0.2kW T = 4 hours Thus, Energy consumed will be E2, PT = 0.8kWh...
Answer: c) 20 is the correct answer. The overall resistance acquired is equivalent to 20 since the resulting resistance generated from the resistors that are connected in series is connected with 40...
Answer: The correct option is d) 30Ω We know that R = ρl/A Substituting the values in the above equation we get 30Ω.
Answer: a) 9 is the correct answer. The overall resistance of the supplied circuit is calculated using a series and parallel combination once more.
e) Given in question : l = 1m , R = 26Ω r = d/2 = 0.3/2 = 0.15mm = 0.15×10-3m We know that, ρ = R×A/l ρ= 1.83×10-6Ωm .
c) Following are the differences between resistance and resistivity: Resistance is the property of the conductor whereas Resistivity is the property of the material used in the conductor . In a...
Answer: c) 1V is the correct answer. We know that V = IR equals the potential difference across a resistor. As a result of swapping the values, we get a potential difference of 3V across the...
long and hinged at A. A rope DE, 
m is tied halfway up. A weight 
is suspended from a point F, 
from B along with the ladder BA. Assuming the floor to be frictionless and neglecting the weight of the ladder, find the tension in the rope and forces exerted by the floor on the ladder. (Take 
) (Hint: Consider the equilibrium of each side of the ladder separately.)Solution: The above figure can be redrawn as, where, $N_{B}$ is the force being applied by floor point $B$ on the ladder $N_{c}$ is the force being applied by floor point $C$ on the ladder The...
solution: \[\begin{array}{*{35}{l}} W=\text{ }\text{ }2.303nRT\text{ }log\text{ }\left( p1/p2 \right) \\ ~ \\ =\text{ }\text{ }2.303\text{ }\times \text{ }1\text{ }mol\text{ }\times \text{...
Answer: b) The current at Y is greater than the current at Z is the correct answer
Answer: Given in the question, V = 230V I = 10amp a) We know that, P = VI Substituting the values of V & I, we get P = 2300 watt = 2300 J/s b) Also, energy consumed in one minute = PT = 138000...
solution: From the given enthalpy outline it tends to be said the adjustment of enthalpy ∆H is positive for the response, for example it will be endothermic. In any case, when goes to the suddenness...
Answer: Where V1 = 5.0, V2 = 10.0, and V3 = 15.0 is the correct answer. We can acquire the correct numbers for V1, V2, and V3 by using the formula V = IR and replacing the values in the...
![\[\left( b \right)\text{ }1/2\text{ }H2\left( g \right)\text{ }+\text{ }1/2\text{ }Cl2\left( g \right)\leftrightharpoons HCl\left( g \right)\Delta rH\Theta =92.32\text{ }kJ\text{ }mol1\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-2732efbedd48f360b154aff012982f0c_l3.png "Rendered by QuickLaTeX.com")
solution: Among these two cycles, simultaneously or response (b) the expected energy/enthalpy change is contributing component to the immediacy.
Answer: a) Resistivity is defined as: ρ = R×A/l where,R is the resistance of the conductor, A is the cross-sectional area of the conductor and l is the length of the conductor. b) The SI unit of...
Answer: c) The amount of energy consumed by 40W lamp in 1 hour, E1 = PT = 40 watt-hour 1 watt-hour = 3.6kj Thus, E1 = 144kJ Energy consumed by 60 watt lamp in 1 hour, E2 = PT = 216kJ Total energy...
solution: At the point when an optimal gas in a pressure, where the adjustment of tension is completed in boundless advances for example through a reversible interaction, the work done can be...
Answer: Given in question , l = 1.0m , R = 23 ohm , ρ = 1.84×10-6Ωm We have, R = ρl/A 23 = 1.84×10-6 × 1/A A = 8×10-8 m2
Answer: d) 25 is the correct answer. The ratio of the resistance and the resulting resistance achieved when the parts are linked in parallel is 25 when a resistance wire is cut into...
c) ρ = 3ρ R’ = 3ρl/A = 3R Therefore, resistance becomes 3 times.
Answer: We know that, R = ρl/A a) l becomes 3l R’ = ρ3l/A = 3R Therefore, resistance gets tripled b) d becomes 3d & R = ρl/A R = ρl/πr2 = ρl/π(d/2)2 R’ = R/9 Therefore, resistance becomes...
solution: From this chart we can get the be the work done on the ideal gas encased in the chamber in 1 stage: the region covered by P-V diagram (concealed locale) is the real worth of the...
Answer: a) When a wire's resistance is changed, the cross-sectional area increases, lowering the resistance. b) When a wire's resistance is changed, the material's diameter is increased, lowering...
Answer: c) As the temperature is increased, the resistance will increase
Answer: Given in the question, Number of lamps = 2 P1 = 40W P2 = 60W V = 220V a) Circuit diagram is shown below, b) The voltage across both bulbs is the...
Answer: The following are the impacts on a metal wire's resistance when: a) The resistance will grow when the length is increased. As $R=\rho L/a$ i.e resistance is directly proportional to length...
At the bottom of the inclined plane, the centre of mass of the cylinder has a speed of 
.initial velocity of the solid cylinder is given $v=5 \mathrm{~m} / \mathrm{s}$ Angle of inclination is given as $\theta=30^{\circ}$ We assume that the cylinder goes up to a height of $h$, so we get:...
and a moment of inertia of 
about an axis through its centre perpendicular to the lines joining the two atoms. Suppose the mean speed of such a molecule in a gas is 
and that its kinetic energy of rotation is two-thirds of its kinetic energy of translation. Find the average angular velocity of the molecule.Mass of one oxygen molecule is given as $m=5.30\times10^{-26}kg$ So, the mass of each oxygen atom will be $\frac{m}{2}$ Moment of inertia is given as $I=1.94\times10^{-46}kg m^{2}$ Velocity of the...
Answer: Given, V = 6V R1 = 2 Ω R2 = 3 Ω Combined resistance, Rt = 2+3 = 5 Ω I = V/Rt = 10/5 = 2A a) Potential difference across 2 Ω resistor = IR1 = 4V b) Potential difference across 3 Ω resistor =...
Answer: Given, V = 6V R1 = 2 Ω R2 = 3 Ω a) resistance of combination , Rt = 2+3 = 5 Ω b) Current flowing I = V/Rt = 10/5 = 2A
Answer: Given, V = 6V R1 = 3 Ω R2 = 6 Ω Current via three resistors = V/R1 = 6/3 = 2A
Answer: Given, V = 6V R1 = 3 Ω R2 = 6 Ω a) Resistance in combination, 1/R = 1/R1 + 1/R2 = 1/3 + 1/6 = ½ R2 = 2 b) Current flowing in the main...
Answer: Given, V = 4V R1 = 6 Ω R2 = 2 Ω Combined resistance, R = R1 + R2 = 8 ohm Current flowing, I = V/R = 4/8 = 0.5 amp Difference in potential...
Answer: Given, V = 4V R1 = 6 Ω R2 = 2 Ω a) Combined resistance, R = R1 + R2 = 8 ohm b) Current flowing, I = V/R = 4/8 = 0.5 amp ...
Answer: a) Given in the question, V = 6V R1 = 1 ohm R2 = 2 ohm Thus, we get Equivalent resistance of R1 & R2 in series, R = R1 + R2 = 3 ohm Total current, I = V/R = 6/3 = 2amp Current through...
Answer: Given, V = 12V R1, R2, and R3 are linked in a series. Current through R1 = V/R1 = 12/5 = 2.4 A Current through R2 = V/R2 = 12/10 = 1.2 A Current through R3 = V/R3 =...
Answer: 1st case: TV set Given, P = 250W = 0.25kWh T = 1 hour Thus, we get Energy consumed, E = PT = 0.25kWh 2nd case: Toaster Given, P = 1200W = 1.2kW T = 10 min = 1/6 hour Thus, we get Energy...
Given, V = 12V R1, R2, and R3 are linked in a series. a) Current through R1 = V/R1 = 12/5 = 2.4 A Current through R2 = V/R2 = 12/10 = 1.2 A Current through R3 =...
Answer: Given in the question, I = 5amp V = 220V T = 2 hours We have to find P = ? E = ? We know that, P = VI Substituting the values of V & I, we get P = 1.1kW Also we know that, Energy...
Answer: a) R1 represents the equivalent resistance of 10 and 40 resistances: 1/R1 = 1/10 + 1/40 = 5/40 R1 = 8 Ω R2 is the equivalent resistance of 30 ohms, 20...
Answer: Given in the question that, P = 4kW V = 220V T = 2hours c) Energy consumed in two hours, E = PT Substituting the values of P & T, we get E = 8kWh d) Cost of 1kWh = Rupees 4.6 Total cost...
(a) Let m be the mass of the ball let h be the height of the ball let v be the final velocity of the ball at the bottom of the plane The ball possesses Potential energy $mgh$ at the top of the...
When coils A and B are utilised in parallel, the current drawn is: Total resistance is 1/R = 1/Ra + 1/Rb = 1/24 + 1/24 = 2/24 = 1/12 R = 12 ohms I = V/R = 220/12 = 18.33 amps
answer: given Ra = Rb = 24 ohm a) Current drawn when coil A is the only one used: I = V/Ra = 220/24 = 9.16 amps b) Current drawn in series when coils A and B are used: Total resistance, R = Ra + Rb...
Answer: given that I = 5 amp V = 220 V R = V/I = 220/5 = 44 ohm The resultant resistance must be less than 176 ohm. Therefore, the resistors are connected in parallel Let...
Answer: Given in the question that, P = 4kW V = 220V a) Current, I = ? We know that, P = VI Substituting the values of P & V, we get I = 16amp b) Resistance, R = ? We know that, P = I2R...
Given, 1 amp = I R = 5 ohm ohm ohm ohm o Because the resistors are linked in parallel and the voltage across them is the same, the potential difference across each resistor is the same....
V/R = total current flowing through circuit Where R stands for total resistance. I = 12/6 = 2 amp Difference in potential across R1 = R1I = 8V
Answer: It is given in the question that, V = 250V I = 0.4 amp a) We have to find P = ? We know that, P = VI Substituting the values of V & I, we get P = 100 watt b) We have to find R = ? We...
solution: In the accompanying cyclic ( 1 → 2 →3 →1 ) measure the underlying and last point is something very similar (for example 1). Subsequently the enthalpy change or\[H=\text{ }0\]...
answer: When two resistors are linked in parallel, the total resistance is 1/3 + 1/6 = 1/R' 3/6 = 1/R' R' is equal to 2 ohms. Total circuit resistance = 2 + 4 = 6...
Answer: 1st case, Power, P1 = 60W Number, n1 = 2 Time for use, T1 = 4 hours everyday Energy consumed, E1 = n1 × P1 × T1 E1 = 2 × 60 × 4 = 480watt-hour = 0.48kWh As a result, total energy consumed...
answer: a) When the two resistors are linked in series, the current through the resistors is kept to a minimum. The current flow is greatest when the resistors are linked in parallel. b) If the...
![\[\begin{array}{*{35}{l}} \left( I \right)\text{ }w\text{ }\left( reversible \right)\text{ }=\text{ }w\text{ }\left( irreversible \right) \\ ~ \\ \left( ii \right)\text{ }w\text{ }\left( reversible \right)\text{ }<\text{ }w\text{ }\left( irreversible \right) \\ ~ \\ \left( iii \right)\text{ }w\text{ }\left( reversible \right)\text{ }>\text{ }w\text{ }\left( irreversible \right) \\ ~ \\ \left( iv \right)\text{ }w\text{ }\left( reversible \right)\text{ }=\text{ }w\text{ }\left( irreversible \right)\text{ }+\text{ }pex.V \\ \end{array}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-cd21a1dca804f61b0640fc61b9848d76_l3.png "Rendered by QuickLaTeX.com")
Arrangement: Alternative (ii) is the appropriate response. w (reversible) < w (irreversible) Region under the bend is more noteworthy in irreversible pressure than that of reversible...
a) The relation between electric charge, time, and electric current is given as: Current $=($charge moved$) /($time$)$ While work done = potential difference $\times$ charge moved Therefore, above...
answer: Assume the following circuit: V = 4V Total resistance in line 1 = R1 = 6 + 3 = 9 Ω Total resistance in line 2 = R2 = 12 + 3 = 15 Ω a) Current flowing...
Answer: It is given in the question that, V = 220V P = 2.2kW = 2200 watt T = 3 hours It is known to us that Energy consumed = PT = 6.6kWh We also know that, P = VI Thus we get, I = 10...
As we all know, resistance is the measurement of an electrical circuit's resistance to current flow. The current is measured with an ammeter, while the potential difference is measured with a...
A device used to measure the flow of electric current is known as an ammeter. An ammeter is always linked in series with the electric current being measured. The following diagram shows how to...
![\[\left( Considering\text{ }that\text{ }1\text{ }L\text{ }bar\text{ }=\text{ }100J \right)\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-8331e87f2ad28a3aa312920b78f9ba7f_l3.png "Rendered by QuickLaTeX.com")
solution: \[\begin{array}{*{35}{l}} Measure\text{ }of\text{ }work\text{ }done\text{ }=\text{ }-\text{ }pext\text{ }V \\ ~ \\ =\text{ }\text{ }2\text{ }bar\text{ }\times \text{ }\left(...
a) An electric current is defined as the flow of electric charges through a conductor where the flow of current is caused by the potential difference between two locations in the conductor. b) The...
a) A cell or a battery is used to sustain the potential difference across a conductor. b) Given, Potential difference $=10 \mathrm{~V}$, Current, I $=2 \mathrm{~A}$ Time taken, $t=60 \mathrm{~s}$ We...
Answer: a) It is given in the question that, R = 300 ohm I = 1 amp T = 1 hour P = I2R = 300W E = PT = 300 watt-hour b) It is given in the question that, R = 100 ohm I = 2 amp T = 1 hour P = I2R =...
![\[2H2\left( g \right)\text{ }+\text{ }O2\left( g \right)\text{ }\to \text{ }2H2O\left( l \right)\text{ }is\text{ }Hr\Theta \text{ }=\text{ }\text{ }572\text{ }kJ\text{ }mol1\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-8d6c7a9cb211975cf0d634a1d03b0573_l3.png "Rendered by QuickLaTeX.com")
solution: For the given response : \[2H2\left( g \right)\text{ }+\text{ }O2\left( g \right)\text{ }\to 2H2O\left( l \right)\] the standard enthalpy of response is \[Hr\Theta \text{ }=\text{...
a) Electrons and closed b) Amperes, ammeter, and series
![\[\left( Molar\text{ }mass\text{ }of\text{ }CCl4\text{ }=\text{ }154\text{ }g\text{ }mol1 \right).\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-604d3d18d37df5c65742bf95bae2d83d_l3.png "Rendered by QuickLaTeX.com")
solution: The enthalpy of vapourisation is given \[\begin{array}{*{35}{l}} for\text{ }1\text{ }mole\text{ }of\text{ }CCl4\text{ }=\text{ }30.5\text{ }kJ\text{ }mol1 \\ ~ \\...
Given, Time taken, $t=10 s$ Charge moved, $\mathrm{Q}=25 \mathrm{C}$ Energy delivered is work done $=200 \mathrm{~J}$ a) Potential difference $=($ work done $) /($ charge moved $)=(200) /(25)=8...
Answer: It is given in the question that, V = 220V I = 0.5A P = ? It is known to us that, P = VI P = 110 watt
![\[H2\left( g \right)\text{ }+\text{ }Br2\left( g \right)\text{ }\to \text{ }2HBr\left( g \right)\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-6781e80aeb9eec44245bdbf15b422c68_l3.png "Rendered by QuickLaTeX.com")
solution: For the response \[H2\left( g \right)\text{ }+\text{ }Br2\left( g \right)\text{ }\to 2HBr\left( g \right)\] \[\begin{array}{*{35}{l}} Enthalpy\text{ }change \\ ~ \\ =\text{...
Answer: a) To brighten the lights, turn the switch to the right, as the resistance lowers as the switch is turned to the right. As a result, the circuit's resistance will be reduced. b) To dim the...
Given, Potential difference $=12 \mathrm{~V}$ a) Potential difference = (work done)/(charge moved) Work done = Potential difference$\times$ charge moved Therefore, $12 \mathrm{~J}$ of electrical...
Answer: a) When the lamps are connected in a series, the lamps will stop lighting if one of the filaments breaks. Because the circuit is broken due to the broken lamp. b) When the lamps are...
solution: The warmth of ignition ∆Hc of graphite (for example carbon) is given as \[=\text{ }20.7\text{ }kJ\] for 1g of graphite (C). \[1\text{ }mole\text{ }of\text{ }Carbon\text{...
Answer: When two bulbs are linked in parallel instead of series, they create more light. This occurs because the voltage difference between parallel combinations remains constant. However, in the...
![\[H\text{ }=\text{ }U\text{ }+\text{ }PV\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-30f978ca15c7de7187e41cd4fbcf8a4b_l3.png "Rendered by QuickLaTeX.com")
solution: For an optimal gas, the distinction between these two \[is\text{ }CP\text{ }\text{ }CV\text{ }=\text{ }nR,\] the all inclusive gas consistent and \[where\text{ }n=\text{ }no.\text{...
Answer: c) B and A are connected in series. If B burns out, A will also burn out. C, on the other hand, remains the brightest as it is in parallel combination with the other two.
Given, Charge moved $=1.6 \times 10^{-19}$ coulombs Current, I $=1 \mathrm{~A}$ Time taken, $t=1 \mathrm{~s}$ We know that, $\text{I}=\text{Q}/\text{t}$ $1=\text{Q}/1$ $\text{Q}=1\text{C}$ We also...
solution: \[\begin{array}{*{35}{l}} For\text{ }water,\text{ }molar\text{ }warmth\text{ }limit\text{ }=\text{ }18\text{ }x\text{ }Specific\text{ }warmth\text{ }or \\ ~ \\ Cp~=\text{...
A circuit diagram is a graphic that uses electric symbols to show the individual components in an electric circuit and how they are connected. A voltmeter, on the other hand, will have a higher...
solution: Work done in vacuum is determined by : \[\begin{array}{*{35}{l}} -\text{ }w\text{ }=\text{ }Text\text{ }\left( Vinitial\text{ }\text{ }Vfinal\text{ } \right) \\ ~ \\...
a) Because the value of the current flowing through the circuit is constant, the resistance of an ammeter should be very low. b) A voltmeter's resistance should be quite high since the current...
solution: Warmth is free of the way under 2 conditions: At the point when the volume of the framework is kept steady By first law of thermodynamics: ...
c) Voltage is another word for potential difference.
The correct answer is a) An ammeter is connected in series in a circuit and a voltmeter is connected in paralle
solution: For a disengaged framework \[q=0\text{ }and\text{ }w=0\] What's more, as indicated by first law of thermodynamics: \[U=\text{ }q\text{ }+\text{ }w\text{ }\left(...
Answer: a) Let us consider two wires with same length and diameter. Let these two wires be of copper metal and nichrome alloy. We know that the resistance of nichrome wire is 60 times more than...
The right option for measuring current unit is d) Ampere.
Answer: c) As the temperature rises, the material's resistance rises as well.
Difference in potential across AB = IR3 = 1 × 5 = 5V Between B and C, the equivalent resistance is 1/R’ = 1/R1 + 1/R2 = 1/10 + 1/15 = 5/30 R’ = 6Ω Total resistance...
solution: Gibbs energy for a response in which all reactants and items are in standard state. ΔrG° is identified with the harmony consistent of the response as follows ...
Answer: Based on the circuit diagram above; a) The total current is 1 amp when I insert the parallel combination of resistances R1 and R2. The current flow through R1 is I1, while the current...
Answer: a) The resistance of a conductor is proportional to its length. The material's resistance diminishes as the length of the material rises, and vice versa. b) The resistance of a conductor is...
solution: Water has solid hydrogen bonds and the high extremity likewise accumulates in coming about it to bubble at higher temperatures. Thus water has a higher molar enthalpy than CH3)2CO....
Answer: Because the resistance of a thick wire is lower than that of a thin wire, current flow will be easier in a thick wire than in a thin wire.
solution: State capacities: enthalpy, entropy, temperature and free energy. Way works: Heat and work
Answer: a) Two examples of substances that are good conductors of electricity are silver and copper. These two metals have free electrons that are available for conduction. b) Given in question : l...
solution: The standard molar entropy of H20 (1) is 70 J K-1 mol-1. The strong type of H20 is ice. In ice, atoms of H20 are less irregular than in fluid water. In this way, molar entropy of...
Answer: c) Difference in potential across the bulb = IR1 = 0.25 20 = 5V d) Difference in potential across the resistance wire = IR2 = 0.25 4 = 1V
Answer: a) Following is the expression for the resistance of a metallic wire in terms of the resistivity: R = ρl/A Where, R is the resistance of the wire , ρ is the resistivity of the wire , A is...
Answer: a) Resistivity is defined as the characteristic property of a substance which is dependent on the nature of the substance and the temperature of the substance used in the conductor. It is...
Answer: Ohm, increases, increases, and decreases respectively .
a) given R1=20 , R2 =4, Total resistance of the circuit is given as: R = R1 + R2 = 20 + 4 = 24Ω b) We know that, V = IR Therefore, 6 = 24I I = 6/24 = 0.25amp
Given that, Current, I $=5 \mathrm{~A}$ Time taken, $t=1 \mathrm{~s}$ We already know that, $\text{I}=\text{Q}/\text{t}$ $\text{Q}=\text{I}\times \text{t}=5\times 1=5\text{C}$ Total number of...
Answer: a) Because it receives greater voltage than the other two, C will be the brightest of the three. However, as they are in a series combination, A and B will be equally brilliant. b) If C...
Answer: a) As the temperature drops, the material's resistance drops as well. b) The presence of impurities in a metal enhances the material's resistance.
Answer: Following has more resistance: a) A long piece of nichrome wire . b) A thin piece of nichrome wire .
Answer: a) b) By connecting the lamps in parallel, the lamp's brightness can be adjusted.
Answer: Electric iron and toaster coils are composed of an alloy rather than a pure metal for the following reasons: a) When compared to pure metal, an alloy's resistivity is higher. b) At high...
Answer: The correct answer is c) A and B are illuminated when S2 is open, and S1 is closed.
Answer: The following are the two reasons why nichrome alloy is utilised to make electrical device heating elements: a) Nichrome has a very high resistance. b) At high temperatures, nichrome does...
Given that, Potential difference $=230 \mathrm{~V}$ Current, I $=8 \mathrm{~A}$ a) $I=Q / t$ $8=\mathrm{Q} / 1$ $\mathrm{Q}=8 \times 1=8 \mathrm{C}$ Hence, the current is $8 \mathrm{C}$. b) We...
Answer: The correct option is b) if one lamp fails, the others remain lit. The current going through the bulbs is different when they are connected in parallel. As a result, even if one lamp burns...
Answer: Nickel, chromium, manganese, and iron are used to make nichrome alloys. Nichrome's resistivity is 60 times higher than copper's. It is utilised in the manufacture of the heating elements...
Answer: c) All of the lamps are linked together in a series combination. d)
Answer: The substance used to make the heating element of an electric iron is nichrome.
Answer: a) When it comes to household wiring, parallel circuits are preferable over series circuits. This is because when one of the electrical appliances fails, it affects the others. b) The bulbs...
Answer: Because copper and aluminium wires have low resistivities, they are employed for power transmission.
Given, Charge moved $=300 \mathrm{C}$ Time taken $=10$ mins Current $=?$ $\mathrm{I}=\mathrm{Q} / \mathrm{t}$ By substituting the values, we get $\mathrm{I}=0.5 \mathrm{~A}$ hence, the correct...
Answer: Between iron and mercury, iron is a better electrical conductor. Iron has a lower resistance than mercury, and we know resistance is inversely proportional to current. As a result, as...
Answer Given, R1 = 0.2 Ω R2 = 0.3 Ω R3 = 0.4 Ω R4 = 0.5 Ω R5 = 12 Ω V = 9V Therefore, the resultant resistance is given as: R = R1 + R2 + R3 + R4 + R5 = 0.2 + 0.3 + 0.4 + 0.5 + 12 = 13.4 Ω...
Given that, Current, I $=5 \mathrm{~A}$ Time taken, $t=10 \mathrm{~s}$ Charge moved, $Q=$ ? $\text{I}=\text{Q}/\text{t}$ $\text{Q}=\mid \times \text{t}$ $\text{Q}=50\text{C}$ hence, the correct...
Answer: The best conductor of electricity is silver metal. This is due to the fact that, in comparison to other metals, the electrons in silver metal are open for free mobility.
Answer: The resistance of a conductor is determined by the following factors: a) The conductor's length . b) The conductor's cross-section .al area c) The conductor's temperature . d) The type of...
Answer: When the configuration is parallel, the battery's current consumption is higher. Any problem in one bulb will not influence the other operation because the bulbs are in a parallel...
Answer: Following is the right answer: c) The most significant amount of light is produced in the circuit (i). The resistance in the circuit is minimal because only one bulb is used, resulting in...
Answer: The following are the correct answers: a) The lamps in the circuit (ii) are the dimmest. Because the bulbs are connected in series, lowering the voltage in the rotation. b) The lamps in the...
Answer: When two or more resistances are connected end to end in a series combination, the resistances are said to be connected in series. The sum of all individual resistances equals the sum of any...
Answer: When the length of the wire is twice, the resistance of the wire doubles. Because resistance is proportional to length, yet area of cross section is inversely related to resistance, this is...
solution: For the given response \[N2O4\text{ }\left( g \right)\leftrightharpoons 2NO2\text{ }\left( g \right)\text{ }the\text{ }worth\text{ }of\text{ }Kp\text{ }=\text{ }0.98.\]...
Answer: The following are the right answers: c) When a parallel circuit is employed, the appliance's operation can be regulated by individual switches. d) When appliances are linked in parallel,...
Answer: The following are the correct answers: a) The circuit must be parallel to have an identical power supply line. b) Each bulb will have the highest voltage when the circuit is parallel.
solution: As warm balance submits to the zeroth law of thermodynamics, temperature of framework and environmental factors will be a similar when they are in warm balance.
Answer: Given in the question, I = 5A R = 100 ohm T = 2 hours It is known to us that, Energy consumed = P × T = I2RT Substituting the values, Energy consumed = 5kWh 1kWh = 3.6 × 106J Therefore we...
Answer: Given, R1 = 6Ω R2 = 4 Ω V = 24V The two resistances are linked in parallel, according to the circuit schematic. Therefore, Current across R1 = I1 = V/R1 = 24/6 = 4amp Current across R2 = I2...
Answer: As the thickness of the conductor is increased, the resistance of the conductor decreases. This is because: R = (ρl)/(A) Where,R is the resistance . l is the length of the conductor , A is...
solution: The numerical connection which relates these three boundaries is \[\Delta S\text{ }=\text{ }qrev/T\] where ΔS is the adjustment of entropy and T represents...
Answer: The quantity of electrical energy consumed when a 1 watt electrical appliance is used for 1 hour is measured in watt-hours. 1 watt-hour = 3600 joules.
Answer: In a household circuit, different electrical appliances are linked in parallel because: a) The voltage distribution from the power supply line to each appliance is the same. b) Individual...
Given that R1 = 4Ω R2 = 4 Ω R3 = 3 Ω From the given circuit diagram, 1/R = 1/R1 + 1/R2 1/R = ¼ + ¼ R = 2 Ω Total resistance = R + R3 = 2 + 3 = 5 Ω
Answer: Conductor: mercury, aluminium, iron, metal coin . Resistor: manganin, nichrome . Insulator: rubber, polythene, wood, bakelite, paper, thermocol .
a) Given that R1 = 500Ω R2 = 1000Ω From the above circuit diagram, R = R1 + R2 = 500 + 1000 =1500Ω b) Given that R1 = 2Ω R2 = 2Ω From the given circuit diagram, 1/R = 1/R1 + 1/R2 1/R = ½ + ½...
Answer: The equation that connects watts, volts, and ampere is as follows: 1 watt = 1 volt × 1 ampere
![\[\begin{array}{*{35}{l}} \Delta sub\text{ }H\theta for\text{ }sodium\text{ }metal\text{ }=\text{ }108.4\text{ }kJ\text{ }mol1 \\ ~ \\ Ionization\text{ }enthalpy\text{ }of\text{ }sodium\text{ }=\text{ }496\text{ }kJ\text{ }mol1 \\ ~ \\ Electron\text{ }acquire\text{ }enthalpy\text{ }of\text{ }bromine\text{ }=\text{ }\text{ }325\text{ }kJ\text{ }mol1 \\ ~ \\ Bond\text{ }separation\text{ }enthalpy\text{ }of\text{ }bromine\text{ }=\text{ }192\text{ }kJ\text{ }mol1 \\ ~ \\ \Delta f\text{ }H\theta for\text{ }NaBr\text{ }\left( s \right)\text{ }=\text{ }\text{ }360.1\text{ }kJ\text{ }mol1 \\ \end{array}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-e26257ae943a58e5b93fe8059b1e1238_l3.png "Rendered by QuickLaTeX.com")
solution: Sublimation of the metal(ΔsubHΘ) →Ionization of the metal (ΔiHΘ) →Dissociation of the non-metal (ΔdissHΘ) →Gain of electrons by the non-metal(ΔegHΘ) \[\Delta f\text{ }H\theta...
Answer: The following are the differences between excellent conductors, resistors, and insulators: Good conductors are those materials that have a low or negligible electrical resistance. Conductors...
Answer: Given that each part's resistance is R/2 Let's call the resulting resistance R'. 1/R’ = 2/R + 2/R R’ = R/4
![\[CH4\left( g \right)\to \text{ }C\left( g \right)\text{ }+\text{ }4H\text{ }\left( g \right)\text{ }is\text{ }1665\text{ }kJ\text{ }mol1\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-50889d40215348f358defd7ebfa19015_l3.png "Rendered by QuickLaTeX.com")
solution: For 1 C-H bond, the bond energy will be equivalent to 1/4 that of the enthalpy of atomisation \[=\text{ }\left( 1665/4 \right)\text{ }=\text{ }416.25\text{ }kJ\text{...
solution: For the response, A→B the development of B goes through a few middle of the road responses with various enthalpy esteems Δr H1, ΔrH2, ΔrH3… .., and the general enthalpy change is Δr...
![\[\Delta fH\Theta for\text{ }NH3\text{ }is\text{ }\text{ }91.8\text{ }kJ\text{ }mol1\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-1b9eb484f00117499f2332746d6bffcd_l3.png "Rendered by QuickLaTeX.com")
![\[2NH3\left( g \right)\text{ }\to \text{ }N2\left( g \right)\text{ }+\text{ }3H2\left( g \right)\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-622a4b989965f3ae76c2a96693b81e2c_l3.png "Rendered by QuickLaTeX.com")
solution: Enthalpy change of a response is determined as : Σbond enthalpy of reactants-Σbond enthalpy of items for the deterioration \[\begin{array}{*{35}{l}} 2NH3\left( g...
![\[CaO\left( s \right)\text{ }+\text{ }CO2\left( g \right)\text{ }\to \text{ }CaCO3\left( s \right)\text{ };\text{ }\Delta fH\Theta \text{ }=\text{ }\text{ }178.3\text{ }kJ\text{ }mol1\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-09765da93303511a8d85bc4ef9576452_l3.png "Rendered by QuickLaTeX.com")
solution: The given response \[CaO\left( s \right)\text{ }+\text{ }CO2\left( g \right)\text{ }\to CaCO3\left( s \right)\] is demonstrating that it is happening in the standard type of 1 mole...
solution: Among the two fluids, water has a higher enthalpy of vapourisation (burning-through higher warmth energy). Thusly, ∆Hvapourisation (water) > ∆Hvapourisation...
solution: Enthalpy change of vapourisation for \[1\text{ }mole\text{ }=\text{ }40.79\text{ }kJ\text{ }mol1\] enthalpy change of vapourisation for \[2\text{ }moles\text{ }of\text{ }water\text{...
Answer: Given in the question, P = 920W V = 230V I = ? It is known to us that, P = VI 920 = 230I I = 920/230 I = 4A
When connecting residential electrical appliances in a circuit, a series configuration is not used since if one of the electrical appliances fails, it affects all of the others. In addition, the...
Answer: Another piece of information offered by the label is that the rate of energy consumption is 36J/s.
![\[2\text{ }Zn\text{ }\left( s \right)\text{ }+\text{ }O2\text{ }\left( g \right)\text{ }\to \text{ }2\text{ }ZnO\text{ }\left( s \right)\text{ };\text{ }H\text{ }=\text{ }\text{ }693.8\text{ }kJ\text{ }mol1\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-21eecefaac280bd02b037eefe5eb121b_l3.png "Rendered by QuickLaTeX.com")
solution: Choice (I) and (iii) are the appropriate responses
Answer: We are aware of this, P =V2/R R is constant V is doubled Therefore, P = 2(V2)/R P = 4V/R As a result, when the resistance is doubled, the power is multiplied by four.
![\[w\text{ }=\text{ }\text{ }nRT\text{ }ln\text{ }Vf/Vi\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-000900d27450b7c6bf2488384463f995_l3.png "Rendered by QuickLaTeX.com")
solution: Alternative (iii) and (iv) are the appropriate responses. work done at 600 K is double the work done at 300 K. Since each case includes isothermal extension of an optimal gas, there...
Answer: The following is estimated when the resistance configuration from A is combined with the resistance arrangement from B: 1/R = 1/10 + 1/1000 = (100+1)/1000 R = 1000/101...
Answer: The circuit schematic below shows two 4V bulbs that are connected in parallel with 2V cells.
Answer: kWh stands for kilowatt-hour and is the commercial unit of electrical energy.
solution: Alternative (iii) and (iv) are the appropriate responses. Gas grows or diffuses in accessible space suddenly, e.g., spillage of cooking gas gives smell of ethyl mercaptan...
Answer: Electric power is measured in watts.
solution: Choice (I) and (ii) are the appropriate responses. For an exothermic response\[,\text{ }qp~=\text{ }-\text{ }ve,\text{ }\gamma H\text{ }=\text{ }-\text{ }ve\]
Answer: Electric power is measured in kilowatts, and electric energy is measured in kilowatt-hours.
Answer: The joule is the SI unit of electric energy, and the watt is the SI unit of electric power.