Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2019PhysicsChapterActual

Mercury is often used in clinical thermometers. Which one of the following properties of mercury is not a reason for this?

Options

  1. AThe coefficient of the thermal expansion is large.
  2. BIt is shiny.
  3. CIt is liquid at room temperature.
  4. DIt has high density compared to water.

Correct answer

D. It has high density compared to water.

Step-by-step solution

Mercury is used in thermometers because it is sensitive to temperature changes. Mercury has a noticeable expansion when there is increase in temperature. Since mercury has this quality of high coefficient of expansion and as it can be captured in a glass medium mercury is used in thermometers. Density is not much taken into consideration because the volume is less the weight automatically is less, however density of mercury is less than water.

Practice Chapter on Quantrex Academy →

More from Chapter

A solid spherical body of radius R , density , and specific heat capacity s is initially at temperature T₀ . It is placed in a vacuum chamber at absolute zero and cools by emitting 2026A straight canal has motorboats departing from two terminals at opposite ends. The motorboats depart at regular intervals of T minutes in both directions and travel at a constant s 2026A wooden crate is released from rest at the top of a ramp inclined at 37^ to the horizontal. When the ramp is perfectly smooth, the crate reaches the bottom with a speed v . When t 2026A uniform horizontal beam of mass 6 kg and length L is hinged to a vertical wall at one end. The other end is supported by a light inextensible wire attached to the same wall, maki 2026A bullet P of mass 30 g moving with a speed of 200 m/s penetrates a target and comes to rest after travelling a distance of 10 cm inside it. Another bullet Q of mass 20 g moving wi 2026A small block of mass m is placed at the highest point of a smooth fixed sphere of radius R . It is given a horizontal initial speed v₁ such that it slides down the surface. The bl 2026A block of mass 2 kg is projected with an initial speed of 14 m/s on a rough horizontal surface. The coefficient of kinetic friction between the block and the surface is 0.2 . Afte 2026A uniform horizontal circular disc of mass M and radius R is rotating freely about a vertical axis passing through its center at an angular speed of 40 rpm . Two small blocks, each 2026 Full Chapter list All NEET PYQs