1
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Two moles of helium gas are taken over the cycle $$ABCD$$, as shown in the $$P$$-$$T$$ diagram. AIEEE 2009 Physics - Heat and Thermodynamics Question 397 English

The net work done on the gas in the cycle $$ABCDA$$ is:

A
$$276$$ $$R$$
B
$$1076$$ $$R$$
C
$$1904$$ $$R$$
D
zero
2
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
One $$kg$$ of a diatomic gas is at a pressure of $$8 \times {10^4}\,N/{m^2}.$$ The density of the gas is $$4kg/{m^3}$$. What is the energy of the gas due to its thermal motion ?
A
$$5 \times {10^4}\,J$$
B
$$6 \times {10^4}\,J$$
C
$$7 \times {10^4}\,J$$
D
$$3 \times {10^4}\,J$$
3
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Statement - 1: The temperature dependence of resistance is usually given as $$R = {R_0}\left( {1 + \alpha \,\Delta t} \right).$$ The resistance of wire changes from $$100\Omega $$ to $$150\Omega $$ when its temperature is increased from $${27^ \circ }C$$ to $${227^ \circ }C$$. This implies that $$\alpha = 2.5 \times {10^{ - 3}}/C.$$

Statement - 2: $$R = {R_0}\left( {1 + \alpha \,\Delta t} \right)$$ is valid only when the change in the temperature $$\Delta T$$ is small and $$\Delta T = \left( {R - {R_0}} \right) < < {R_0}.$$

A
Statement - 1 is true, Statement - 2 is true; Statement - 2 is the correct explanation of Statement - 1
B
Statement - 1 is true, Statement - 2 is true; Statement - 2 is not the correct explanation of Statement - 1
C
Statement - 1 is false, Statement - 2 is true
D
Statement - 1 is true, Statement - 2 is false
4
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
The speed of sound in oxygen $$\left( {{O_2}} \right)$$ at a certain temperature is $$460\,\,m{s^{ - 1}}.$$ The speed of sound in helium $$(He)$$ at the same temperature will be (assume both gases to be ideal)
A
$$1421\,\,m{s^{ - 1}}$$
B
$$500\,\,m{s^{ - 1}}$$
C
$$650\,\,m{s^{ - 1}}$$
D
$$300\,\,m{s^{ - 1}}$$
JEE Main Subjects
EXAM MAP