Physics · Science General

Heat Transfer Mechanisms

828 Questions

Heat Transfer Mechanisms deal with the movement of thermal energy through conduction, convection, and radiation. It involves practical applications like ocean heat storage and atmospheric heating. These fundamental physics concepts are frequently asked in general science sections.

Thermal conductionHeat convectionThermal radiationSpecific heatStates of matter

Heat Transfer Mechanisms Questions

Multiple choice

No external heat is required to start

  1. Simultaneous combustion

  2. Spreading fire combustion

  3. Spontaneous combustion

  4. Splendid combustion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The spontaneous processes automatically starts and do not require any external agent.

Multiple choice

Uday dipped a plastic spoon in a cup of ice-cream. He observed that the spoon did not become cold. Which of the following is the correct reason of his observation?

  1. Heat transfers from spoon to ice-cream.

  2. Heat transfers from ice-cream to spoon.

  3. No heat transfer takes place between the spoon and ice-cream.

  4. Plastic spoon is a good conductor of heat.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plastic is a poor conductor of heat, i.e. it is an insulator. Thus, no heat transfer takes place and the spoon does not become cold.

Multiple choice

When we go out with an umbrella in the sun, which of the following options holds good?

  1. The umbrella allows all the heat falling on it to pass through it.

  2. The umbrella reflects back all the heat falling on it.

  3. The umbrella absorbs all the heat falling on it.

  4. A part of the heat falling on the umbrella is reflected, part of it is absorbed and the rest is transmitted.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the heat from the sun falls on an umbrella, a part of it is reflected, a part of it is absorbed and the rest may be transmitted.

Multiple choice

Conduction is a process by which

  1. heat is transferred from the hotter end to the colder end of an object

  2. heat is transferred from the colder end to the hotter end of an object

  3. heat is not transferred between the two ends of an object

  4. heat is radiated by all hot bodies
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.

Multiple choice

Which of the following statements is not true?

  1. All the hot bodies radiate heat.

  2. The transfer of heat by radiation requires a medium.

  3. The temperature of an object increases due to the absorption of heat by the object.

  4. From the sun, the heat reaches us by the process known as radiation.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The transfer of heat by radiation does not require any medium.

Multiple choice

What is the function of a radiator used in vehicle?

  1. Heating of vehicle

  2. Cooling of vehicle

  3. Movement of vehicle

  4. Shining of vehicle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A vehicle radiator is a type of heat exchanger designed to transfer thermal energy from one medium to another for the purpose of cooling the engine.

Multiple choice

Which branch of science deals with heat and energy?

  1. Physics

  2. Kinetics

  3. Thermodynamics

  4. Entropy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thermodynamics is the branch of physics that deals with heat, work, and temperature, and their relation to energy, radiation, and physical properties of matter.

Multiple choice

Heat is transmitted from

  1. hot bodies to warm bodies

  2. cold bodies to hot bodies

  3. hot bodies to cold bodies
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heat energy naturally flows from a region of higher temperature to a region of lower temperature. This is a fundamental principle of thermodynamics.

Multiple choice

Heat stored in water vapour is

  1. specific heat

  2. latent heat

  3. absolute heat

  4. relative heat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Latent heat is the energy absorbed or released by a substance during a phase change, such as water turning into vapour, without changing its temperature.

Multiple choice

Metals get heated by _________.

  1. conduction

  2. convection

  3. radiation

  4. all of the above

  5. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Conduction is the process by which heat is transferred through a solid material, such as metal, via direct contact between atoms or molecules.