RAC ISRO 2017

1. An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of vessel experience

(a) increase in temperature, pressure and energy

(b) decrease in temperature, pressure and energy

(c) increase in temperature and pressure but increase in energy

(d) Increase in temperature and pressure but no change in energy

Answer

2. The specific heat of ideal gas depend on

(a) Temperature

(b) Volume

(c) Molecular weight and structure

(d) Pressure

Excluded For Evaluation

3. Thermal power plant works on

(a) Carnot cycle

(b) Joule cycle

(c) Rankine cycle

(d) Brayton cycle

Answer

4. In an isothermal process, the internal energy of molecules

(a) Increases

(b) Decreases

(c) Depends on temperature

(d) Remains constant

Answer

5. For reversible adiabatic process, change in entropy is

(a) positive

(b) negative

(c) zero

(d) depends on pressure

Answer

6. A cylinder contains 5  m3 of an ideal gas at a pressure of 1. This gas is compressed in a reversible isothermal process till its pressure increases to 5 bar. The work in kJ required for this process is

(a) 804.7

(b) 953.5

(c) 987.5

(d) 1012.3

Answer

7. A steel ball of mass 1 kg and specific heat 0.4 kJ/kg is at a temperature of 60 deg C. It is dropped into 1 kg of water at 20 deg C. The final steady temperature of water is

(a) 23.48 deg C

(b) 32.28 deg C

(c) 20 deg C

(d) 30 deg C

Answer

8. A Bell-Coleman cycle is a reversed

(a) Carnot cycle

(b) Otto cycle

(c) Joule cycle

(d) Rankine cycle

Answer

9. A free bar of length l is uniformly heated from 0°C to a temperature t°C. α is the coefficient of linear expansion and E is the modulus of elasticity. The stress in the bar is

(a) α TE

(b) E/ α T

(c) Zero

(d) None of the above

Answer

10. The materials having same elastic properties in all directions are called

(a) elastic materials

(b) uniform materials

(c) isotropic materials

(d) plastic materials

Answer

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