#### Heat and Thermodynamics One Mark Questions

11th Standard

Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 10
10 x 1 = 10
1. In hot summer aft er a bath, the body’s

(a)

internal energy decreases

(b)

internal energy increases

(c)

heat decreases

(d)

no change in internal energy and heat

2. Th e graph between volume and temperature in Charles’ law is

(a)

an ellipse

(b)

a circle

(c)

a straight line

(d)

a parabola

3. When a cycle tyre suddenly bursts, the air inside the tyre expands. Th is process is

(a)

isothermal

(b)

(c)

isobaric

(d)

isochoric

4. An ideal gas passes from one equilibrium state (P1, V1, T1, N) to another equilibrium state (2P1, 3V1, T2, N). Then

(a)

T1-T2

(b)

${ T }_{ 1 }=\frac { { T }_{ 2 } }{ 6 }$

(c)

T1 = 6T2

(d)

T1 = 3T2

5. When a uniform rod is heated, which of the following quantity of the rod will increase

(a)

mass

(b)

weight

(c)

center of mass

(d)

moment of inertia

6. When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy applied which increases the internal energy of gas is

(a)

$\frac { 2 }{ 5 }$

(b)

$\frac { 3 }{ 5 }$

(c)

$\frac { 3 }{ 7 }$

(d)

$\frac { 5 }{ 7 }$

7. Cv & C denote the molar specific heat capacities of a gas at constant volume and constant pressure then

(a)

Cp - Cv is larger for a diatomic ideal gas than for a monoatomic ideal gas

(b)

Cp, + Cv is larger for a diatomic ideal gas than for a monoatomic ideal gas

(c)

Cp, / Cv is larger for a diatomic ideal gas than for a monoatomic ideal gas

(d)

Cp, x Cv is lesser for a diatomic ideal gas than for a monoatomic ideal gas

8. Two thermally insulated vessels 1 & 2 are filled with air at temp (T, T2), volume (V1,'V2 & pressure (P1 P2)' If the valve going to the 2 vessels is opened, the temperature on the inside of the vessel at equilibrium will be

(a)

T1 + T2

(b)

$\frac { { T }_{ 1 }+{ T }_{ 2 } }{ 2 }$

(c)

$\frac { { T }_{ 1 }{ T }_{ 2 }\left( { P }_{ 1 }{ V }_{ 1 }+{ P }_{ 2 }{ V }_{ 2 } \right) }{ { P }_{ 1 }{ V }_{ 1 }{ T }_{ 2 }+{ P }_{ 2 }{ V }_{ 2 }{ T }_{ 1 } }$

(d)

$\frac { { T }_{ 1 }{ T }_{ 2 }\left( { P }_{ 1 }{ V }_{ 1 }+{ P }_{ 2 }{ V }_{ 2 } \right) }{ { P }_{ 1 }{ V }_{ 1 }{ T }_{ 1 }+{ P }_{ 2 }{ V }_{ 2 }{ T }_{ 2 } }$

9. 1 mole of a gas with $\gamma =\frac { 7 }{ 5 }$  is mixed with 1 mole of gas with $\gamma =\frac { 5 }{ 3 }$ then value of g of the resulting mixture is

(a)

$\frac { 7 }{ 5 }$

(b)

$\frac { 2 }{ 5 }$

(c)

$\frac { 3 }{ 2 }$

(d)

$\frac { 12 }{ 7 }$

10. A gaseous mixture consists of 16g of helium and 16g of oxygen the ratio of two specific heats of the mixture is

(a)

1.4

(b)

1.54

(c)

1.59

(d)

1.62