1
AIEEE 2009
+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
2
AIEEE 2009
+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
+4
-1
A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature $$\theta$$ along the length $$x$$ of the bar from its hot end is best described by which of the following figures?
A
B
C
D
4
AIEEE 2009
+4
-1
Two moles of helium gas are taken over the cycle $$ABCD,$$ as shown in the $$P$$-$$T$$ diagram.

Assuming the gas to be ideal the work done on the gas in taking it from $$A$$ to $$B$$ is :

A
$$300$$ $$R$$
B
$$400$$ $$R$$
C
$$500$$ $$R$$
D
$$200$$ $$R$$
EXAM MAP
Medical
NEET