A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z

1.  must be in thermal equilibrium

2.  cannot be in thermal equilibrium

3.  maybe in thermal equilibrium.

Which of the curves in the figure represents the relation between Celsius and Fahrenheit temperatures?

1. a 
2. b
3. c
4. d

Which of the following pairs may give equal numerical values of the temperature of a body?

1. Fahrenheit and kelvin

2. Celsius and kelvin

3. Kelvin and platinum

4. None of these

In which of the following pairs of temperature scales, the size of a degree is identical ?

(a) mercury scale and ideal gas scale

(b) Celsius scale and mercury scale

(c) Celsius scale and ideal gas scale

(d) ideal gas scale and absolute scale.

Choose the correct option 

1.  (a) , (b) 

2. (a) , (c)

3. (c) , (d) 

4. (a) , (d)