MCQ on Heat Class 7. We covered all the MCQ on Heat Class 7 in this post for free so that you can practice well for the exam.
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MCQ on Heat for Class 7 Students
Which of the following statements are true regarding heat? 1. Heat is a form of energy. 2. Heat can be reflected by mirror. 3. Heat is an electromagnetic radiation. 4. Heat cannot pass through a vacuum. Select the correct answer from the codes given :
(a) 1,2 and 3
(b) 2,3 and 4
(c) 1,2 and 4
(d) 1,3 and 4
Option a – 1,2 and 3
Which one of the following statements is correct?
(a) Any energy transfer that does not involve temperature difference in some way is not heat
(b) Any energy transfer always requires a temperature difference
(c) On heating the length and volume of the object remain exactly the same
(d) Whenever there is a temperature difference, heat is the only way of energy transfer
Which of the following statements about latent heat for a given substance is/are correct? 1. It is fixed at a given temperature. 2. It depends upon the temperature and volume. 3. it is independent of temperature and volume. 4. It depends on the temperature but independent of volume. Select the correct answer using the code given below :
(a) 2
(b) 1 and 3
(c) 4 only
(d) 1 and 4
Option d – 1 and 4
Which of the following statements about specific heat of a body is/are correct? 1. It depends upon mass and shape of the body 2. It is independent of mass and shape of the body 3. It depends only upon the temperature of the body Select the correct answer using the code given below :
(a) 1 only
(b) 2 and 3
(c) 1 and 3
(d) 2 only
Option a – 1 only
Which one of the following can extinguish fire more quickly?
(a) Cold water
(b) Boiling water
(c) Hot water
(d) Ice
Option b – Boiling water
In which of the following, heat loss is primarily not due to convection?
(a) Boiling water
(b) Land and sea breeze
(c) Circulation of air around blast furnace
(d) Heating of glass surface of a bulb due to current in filament
Option d – Heating of glass surface of a bulb due to current in filament
The working of a microwave oven involves
(a) absorption of microwaves by matter
(b) reception of microwaves by optical fibre
(c) microwave amplification by stimulated emission of radiation
(d) transmission of microwaves through a metal
Option c – microwave amplification by stimulated emission of radiation
Which one of the following statements is not correct?
(a) In the conduction mode of transference of heat, the molecules of solid pass heat from one molecule to another without moving from their positions
(b) The amount of heat required to raise the temperature of a substance is called its specific heat capacity
(c) The process of heat transfer in liquids and gases is through convection mode
(d) The process of heat transfer from a body at higher temperature to a body at lower temperature without heating the space between them is known as radiation
Option b – The amount of heat required to raise the temperature of a substance is called its specific heat capacity
A Kelvin thermometer and a Fahrenheit thermometer both give the same reading for a certain sample. What would be the corresponding reading in a Celsius thermometer?
(a) 574
(b) 301
(c) 273
(d) 232
Option b – 301
The relation PV=RT can describe the behaviour of a real gas at
(a) high temperature and high pressure
(b) high temperature and low pressure
(c) low temperature and low pressure
(d) low temperature and high pressure
Option b – high temperature and low pressure
According to kinetic theory of gases, which one of the following statement(s) is/are true?
(a) Real gas behave as ideal gas at high temperature and low pressure.
(b) Liquid state of ideal gas is impossible
(c) At any temerature and pressure, ideal gas obeys Boyle’s law and charles’ law
(d) The molecules of real gas do not exert any force on one another.
Option a – Real gas behave as ideal gas at high temperature and low pressure
Thermal conductivity of aluminium, copper and stainless steel increases in the order
(a) Copper<Aluminium < Stainless Steel
(b) Stainless Steel < Aluminium <Copper
(c) Aluyminium <Copper < Stainless Steel
(d) Copper < Stainless Steel < Aluminium
Option b – Stainless Steel
Fahrenheit and Celsius are the two scales used for measuring temperature. If the numerical value of a temperature recorded in both the scales is found to be same, what is the temperature?
(a) -40°
(b) +40°
(c) +72°
(d) -72°
Option a – -40°
Two spheres of same size are made of the same metal but one is hollow and the other is solid. They are heated to same temperature, then
(a) both spheres will expand equally
(b) hollow sphere will expand more than the solid one
(c) solid sphere will expand more than the hollow one
(d) none of the above
Option a – both spheres will expand equally
Which one of the following statement is true?
(a) Temperatures differing 25° on the fahrenheit (F) scale must differ by 45° on the celsius (C) scale
(b) 0°F corresponds to -32°C
(c) Temperatures which differ by 10° on the celsius scale must differ by 18° on the Fahrenheit scale
(d) Water at 90°C is warmer than water at 202°F
Option c – Temperatures which differ by 10° on the celsius scale must differ by 18° on the Fahrenheit scale
Which one of the following statements with regard to expansion of materials due to heating is not correct?
(a) As ice melts, it expands uniformly up to 4°C.
(b) Mercury thermometer works using the principle of expansion due to heating.
(c) Small gap is kept between two rails to allow for expansion due to heating.
(d) The length of metallic wire increases when its temperature is increased.
Option a – As ice melts, it expands uniformly up to 4°C
Which one of the following statements is not correct?
(a) Conduction can occur easily in solids, less easily in liquids but hardly at all in gases
(b) Heat energy is carried by moving particles in a convection current
(c) Heat energy is carried by electromagnetic waves in radiation
(d) The temperature at which a solid changes into a liquid is called the boiling point
Option d – The temperature at which a solid changes into a liquid is called the boiling point
We covered all the mcq on heat class 7 above in this post for free so that you can practice well for the exam.
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