Class 7 Science Chapter 4 MCQ. We covered all the Class 7 Science Chapter 4 MCQ in this post for free so that you can practice well for the exam.
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To keep the correct time modern watches are fitted with balance wheels made of
(a) steel
(b) platinum
(c) invar
(d) tungsten
Option c – invar
By increasing the temperature of the liquid, it
(a) volume and density decreases
(b) volume and density increase
(c) volume increases and density decreases
(d) volume decreases and density increases
Option c – volume increases and density decreases
Two spheres of the same size are made of the same metal but one is hollow and the other is solid. They are heated to the same temperature, then
(a) both spheres will expand equally
(b) the hollow sphere will expand more than the solid one
(c) the solid sphere will expand more than the hollow one
(d) None of these
Option a – both spheres will expand equally
A mountain climber finds that water boils at 80°C. The temperature of this boiling water is…… Fahrenheit
(a) 50⁰
(b) 150⁰
(c) 176⁰
(d) 200⁰
Option c – 176⁰
For a constant volume gas thermometer, one should fill the gas at
(a) low temperature and low pressure
(b) low temperature and high pressure
(c) high temperature and low pressure
(d) high temperature and high pressure
Option c – high temperature and low pressure
When a gas is in thermal equilibrium, its molecules
(a) have the same average kinetic energy as molecules
(b) have different energies which remain constant
(c) have a certain constant energy
(d) do not collide with one another
Option a – have the same average kinetic energy as molecules
The pressure exerted on the walls of a container by a gas is due to the fact that gas molecules are
(a) losing their kinetic energy
(b) sticking to the walls
(c) changing their momenta due to collision with the walls
(d) getting accelerated toward the wall
Option c – changing their momenta due to collision with the walls
A solid ball of metal has a spherical cavity inside it. The ball is heated. The volume of a cavity will
(a) decrease
(b) increase
(c) remain unchanged
(d) have its shape changed
Option b – increase
Heat is transmitted from higher to lower temperatures through the actual mass motion of the molecules in
(a) conduction
(b) convection
(c) radiation
(d) None of these
Option b – convection
The spectrum from black body radiation is
(a) line spectrum
(b) band spectrum
(c) continuous spectrum
(d) line and band spectrum
Option c – continuous spectrum
A polished metal plate with a rough black spot on it is heated to about 1400 K and quickly taken into a dark room. Which one of the following statements will be true?
(a) The spot will appear brighter than the plate
(b) The spot will appear darker than the plate
(c) The spot and plate will appear equally bright
(d) The spot and the plate will not be visible in the darkroom
Option a – The spot will appear brighter than the plate
The wavelength of radiation emitted by a body depends upon
(a) the nature of its surface
(b) the area of its surface
(c) the temperature of its surface
(d) All of the above
Option d – All of the above
As the temperature is increased, the time period of a pendulum
(a) increases proportionately with the temperature
(b) increases
(c) decreases
(d) remains constant
Option b – increases
When water is heated from 0°C to 10°C, its volume
(a) increases
(b) decreases
(c) does not change
(d) first decreases and then increases
Option d – first decreases and then increases
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
Option c – Celsius scale and ideal gas scale
The temperature of an iron block is 140°F. Its temperature on the Celsius scale is
(a) 60⁰
(b) 160°
(c) 140⁰
(d) 132°
Option a – 60⁰
For the construction of a thermometer, one of the essential requirements is a thermometric substance that
(a) remains liquid over the entire range of temperatures to be measured.
(b) has a property that varies linearly with temperature
(c) has a property that varies with the temperature
(d) obeys Boyle’s law
Option c – has a property that varies with the temperature
The temperature of the Sun is measured with
(a) a platinum thermometer
(b) a gas thermometer
(c) a pyrometer
(d) vapor pressure thermometer.
Option c – a pyrometer
Which of the following pairs may give equal numerical values of the temperature of a human body?
(a) Fahrenheit and Celsius
(b) Celsius and Kelvin
(c) Kelvin and Reaumur
(d) None of these
Option a – Fahrenheit and Celsius
Which of the following temperatures is the highest?
(a) 100K
(b) -13°F
(c) -20°C
(d) -23°C.
Option b – -13°F
A metal sheet with a circular hole is heated. The hole
(a) gets larger
(b) gets smaller
(c) remains of the same size
(d) gets deformed
Option a – gets larger
The temperature of water at the surface of a deep lake is 2°C. The temperature expected at the bottom is
(a) 0C
(b) 2°C
(c) 4°C
(d) -6°C
Option c – 4°C
Gas thermometers are more sensitive than liquid thermometers because gases ( Class 7 Science Chapter 4 MCQ )
(a) expand more than liquids
(b) are easily obtained
(c) are much lighter
(d) do not easily change their states
Option a – expand more than liquids
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