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To increase the spread of mercury
So that the temperature of the mercury does not come down in the thermometer as soon as it comes out of the mouth.
To reduce the use of mercury to make it clearly visible
To make it clearly viewable
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole
A mirage occurs because of
A mirror produces magnified erect image of an object. The nature of the mirror is
A motor running on electricity at the rate of 400 W raises a block of weight 120 N. If the block moves 8 m vertically in 4 s, the efficiency of the motor is
A moving body on Earth ordinarily comes to rest by itself because of the
A moving bullet hits a solid target resting on a frictionless surface and gets embedded in it. What is conserved in this process?
A moving coil instrument can be used to measure
A moving neutron collides with a stationary a - particle. The fraction of the kinetic energy lost by the neutron is
A multimeter is used to measure