Free Test Heat Transfer – JEE

Q1: Which mode of heat transfer requires a medium?

A. Conduction B. Convection C. Radiation D. None of these

Q2: Which of the following is the fastest mode of heat transfer?

A. Conduction B. Convection C. Radiation D. All are equal

Q3: Thermal conductivity is highest in:

A. Metals B. Liquids C. Gases D. Vacuum

Q4: SI unit of thermal conductivity is:

A. J/s·m·K B. W/m·K C. cal/s·cm·K D. J/m·s

Q5: Which of the following is a poor conductor of heat?

A. Copper B. Silver C. Glass D. Aluminum

Q6: In forced convection, heat transfer depends on:

A. Gravitational force B. External source (fan/pump) C. Natural currents D. None of these

Q7: Which of the following surfaces is best for radiating heat?

A. Black and rough B. White and smooth C. Polished D. Silvered

Q8: Which law governs radiation from a black body?

A. Kirchhoff’s Law B. Newton’s Law C. Stefan-Boltzmann Law D. Fourier’s Law

Q9: The amount of heat transferred through conduction depends on:

A. Material length B. Area C. Temperature difference D. All of these

Q10: Which of the following is not a mode of heat transfer?

A. Radiation B. Convection C. Conduction D. Diffusion

Q11: Heat is transferred by conduction due to:

A. Molecular collision B. Bulk movement C. Electromagnetic waves D. Radiation

Q12: Which quantity remains constant in steady-state heat conduction?

A. Temperature B. Heat flow rate C. Length D. Thermal conductivity

Q13: Which law is used in heat conduction?

A. Newton’s Law B. Fourier’s Law C. Stefan’s Law D. Boyle’s Law

Q14: The heat energy radiated by a body is proportional to:

A. T B. T² C. T³ D. T⁴

Q15: In free convection, the flow of fluid is due to:

A. External sources B. Density differences C. Magnetic force D. Viscosity

Q16: Which surface is best for absorption of heat radiation?

A. White and smooth B. Black and rough C. Silvered D. Polished

Q17: Thermal radiation is primarily in which region of the spectrum?

A. Ultraviolet B. Visible C. Infrared D. X-rays

Q18: Heat transfer in vacuum is possible only by: