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a year ago

Physics Physics NCERT Exemplar Solutions Class 11th Chapter Thirteen

Two molecules of a gas have speeds of 9 x 10⁶ m s^-1 and 1 x 10⁶ ms⁻¹ , respectively. What is the root mean square speed of these molecules.

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Payal Gupta

Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

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a year ago

Physics Physics NCERT Exemplar Solutions Class 12th Chapter Three

The measurement of an unknown resistance R is to be carried out using Wheatstone bridge as given in the figure. Two students perform an experiment in two ways. The first student takes R₂= 10 Ω and R₁ = 5 Ω. The other student takes R₂ = 1000 Ω, and R₁ = 500 Ω. In the standard arm, both take R₃ = 5 Ω.
Both find R = R₂/R₁, R₃ = 100 Ω within errors.
(a) The errors of measurement of the two students are the same
(b) Errors of measurement do depend on the accuracy with which R₂ and R₁ can be measured
(c) If the student uses large values of R₂ and R₁, the currents through the arms will be feeble

...more

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alok kumar singh

Contributor-Level 10

Answer – (b, c)

Explanation – According to the relation that p/q=r/s if galvanometer shows no deflection. In the above equation $\frac{R 1}{R 2} = \frac{R 3}{R 4}$ the value of R4 depends upon R1 and R2 . if the value of R1 and R2 will be feeble the value of R4 would be affected.

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a year ago

Physics Physics NCERT Exemplar Solutions Class 11th Chapter Thirteen

The molecules of a given mass of a gas have root mean square speeds of 100ms^-1 at 27 C° and 1.00 atmospheric pressure. What will be the root mean square speeds of the molecules of the gas at 127°C and 2.0 atmospheric pressure?

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Payal Gupta

Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

V_rms= $\sqrt[]{\frac{3 R T}{M}}$

V_rms= $\sqrt[]{T}$

$\frac{V_{r m s 1}}{V_{r m s 2}} = \sqrt[]{\frac{T_{1}}{T_{2}}}$

T₁=27^oC= 27+273=300K

T₂=127^oC= 127+273= 400K

$\frac{100}{V_{r m s 2}} = \sqrt[]{\frac{300}{400}} = \frac{\sqrt[]{3}}{2}$

V_rms²= $\frac{2 * 100}{\sqrt[]{3}} = \frac{200}{\sqrt[]{3}} m / s$

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a year ago

Physics Physics NCERT Exemplar Solutions Class 12th Chapter Three

Temperature dependence of resistivity ρ(T) of semiconductors, insulators and metals is significantly based on the following factors:
(a) Number of charge carriers can change with temperature T.
(b) Time interval between two successive collisions can depend on T.
(c) Length of material can be a function of T.
(d) Mass of carriers is a function of T.

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alok kumar singh

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Explanation- according to the relation $ρ$ = $\frac{m}{n e 2 t}$ also T $\propto \frac{1}{t}$

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a year ago

Physics Physics NCERT Exemplar Solutions Class 12th Chapter Three

Consider a simple circuit shown in figure stands for a variable resistance R'. R' can vary from R₀to infinity, r is internal resistance of the battery (r <(a) Potential drop across AB is nearly constant as R' is varied.
(b) Current through R' is nearly a constant as R' is varied.
(c) Current I depends sensitively on R'
(d) I ≥ V/r + R always;

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alok kumar singh

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Answer – (a, d)

Explanation- potential drop across AB is independent to R' also when we decrease the value of R the current will also very large. According to the relation I=e/R+r

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a year ago

Physics Physics NCERT Exemplar Solutions Class 12th Chapter Three

Kirchhoff's junction rule is a reflection of
(a) Conservation of current density vector.
(b) Conservation of charge.
(c) The fact that the momentum with which a charged particle approaches a junction is unchanged (as a vector) as the charged particle leaves the junction.
(d) The fact that there is no accumulation of charges at a junction.

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alok kumar singh

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Answer – (b, d)

Explanation-Algebraic sum of the currents flowing towards any point in an electric network is zero. It also tell us about the conservation of charge.

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a year ago

Physics Physics NCERT Exemplar Solutions Class 11th Chapter Thirteen

The volume of a given mass of a gas at 27°C, 1 atm is 100 cc. What will be its volume at 327°C?

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Payal Gupta

Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

V $\propto T$

V/T = constant

$\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}$

T₁=273+27=300K

T₂= 273+327= 600K

V₁= 100cc

V₂=V₁ (600/300)

V₂=2V₁

V₂= 2 (100)=200cc

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a year ago

Physics Physics NCERT Exemplar Solutions Class 12th Chapter Three

Which of the following characteristics of electrons determines the current in a conductor?
(a) Drift velocity alone
(b) Thermal velocity alone
(c) Both drift velocity and thermal velocity
(d) Neither drift nor thermal velocity

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alok kumar singh

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Answer- (a)

Explanation- I=AneV_d , current is directly proportional to drift velocity.

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a year ago

Physics Physics NCERT Exemplar Solutions Class 11th Chapter Thirteen

The volume of a given mass of a gas at 27°C, 1 atm is 100 cc. What will be its volume at 327°C?

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New answer posted

a year ago

Physics Physics NCERT Exemplar Solutions Class 12th Chapter Three

A metal rod of length 10 cm and a rectangular cross-section of 1 cm x 1/2 cm is connected to a battery across opposite faces. The resistance will be
(a) Maximum when the battery is connected across 1 cm x 1/2 cm faces
(b) Maximum when the battery is connected across 10 cm x 1 cm faces
(c) Maximum when the battery is connected across 10 cm x 1/2 cm faces
(d) Same irrespective of the three faces

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alok kumar singh

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Answer- (a)

Explanation- R= $\frac{δ l}{A}$ for greater value of R, A should be less and its possible value when connected across 1cm $*$ 1/2cm faces.

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