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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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mcq on General Science for Students
To ensure accurate timekeeping, modern watches use balance wheels made from
a) steel
b) platinum
c) invar
d) tungsten
Option c – invar
When the temperature of a liquid is increased, its
a) volume and density both decrease
b) volume and density both increase
c) volume increases while density decreases
d) volume decreases while density increases
Option c – volume increases while density decreases
Two metallic spheres of the same dimensions, one Solid and the other hollow, are heated to the same temperature. What will happen?
a) Both expand equally
b) The hollow sphere expands more
c) The Solid sphere expands more
d) None of these
Option a – Both expand equally
A climber notices that water boils at 80°C on a mountain. What is this temperature in Fahrenheit?
a) 50°F
b) 150°F
c) 176°F
d) 200°F
Option c – 176°F
For a gas thermometer with constant volume, the gas should be filled 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) all share the same average kinetic energy
b) have fixed energies that don’t vary
c) possess a uniform energy value
d) don’t interact through collisions
Option a – all share the same average kinetic energy
Gas exerts pressure on the container walls because its particles are
a) losing kinetic energy
b) adhering to the walls
c) changing momentum upon colliding with the walls
d) accelerating towards the walls
Option c – changing momentum upon colliding with the walls
When a metal sphere with an internal cavity is heated, the volume of the cavity
a) decreases
b) increases
c) stays constant
d) changes shape
Option b – increases
Heat moves from hot to cold regions through Molecular motion in
a) conduction
b) convection
c) radiation
d) None of these
Option b – convection
The type of Spectrum emitted by a black body is
a) line Spectrum
b) band Spectrum
c) continuous Spectrum
d) line and band Spectrum
Option c – continuous Spectrum
A polished metal plate has a black rough spot. When heated to 1400 K and moved into a dark room, what is observed?
a) The black spot appears brighter
b) The black spot appears dimmer
c) Both look equally bright
d) Neither is visible in darkness
Option a – The black spot appears brighter
The wavelength of emitted radiation from a surface is influenced by
a) the surface material
b) the size of the surface
c) the surface temperature
d) all of the above
Option d – all of the above
As temperature rises, the time period of a pendulum
a) increases proportionally with temperature
b) increases
c) decreases
d) remains unchanged
Option b – increases
When water is heated from 0°C to 10°C, its volume
a) increases
b) decreases
c) stays the same
d) first decreases, then increases
Option d – first decreases, then increases
In which temperature scale pair are the degrees of equal size?
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
An iron block at 140°F has a temperature of how much on the Celsius scale?
a) 60°C
b) 160°C
c) 140°C
d) 132°C
Option a – 60°C
A key requirement for a thermometric substance is that it
a) stays in a liquid state over the measured temperature range
b) shows a linear change with temperature
c) has a property that varies with temperature
d) follows Boyle’s law
Option c – has a property that varies with temperature
The temperature of the Sun is measured using
a) a platinum thermometer
b) a gas thermometer
c) a pyrometer
d) a vapor pressure thermometer
Option c – a pyrometer
The temperature of the human body can show the same reading in which pair of scales?
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) 100 K
b) -13°F
c) -20°C
d) -23°C
Option b – -13°F
A circular hole in a metal sheet is heated. What happens to the hole?
a) It gets larger
b) It gets smaller
c) Its size stays the same
d) It becomes distorted
Option a – It gets larger
If the water at the lake’s surface is 2°C, the temperature at the bottom is likely to be
a) 0°C
b) 2°C
c) 4°C
d) -6°C
Option c – 4°C
Gas thermometers are more responsive than liquid thermometers because gases
a) expand more than liquids
b) are easier to obtain
c) weigh less
d) resist changing state easily
Option a – expand more than liquids
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