Physics
Mercury is commonly used as a thermometric fluid rather than water because

specific heat of mercury is less than water
specific heat of mercury is more than water
mercury has greater visibility than water
density of mercury is more than the water

ANSWER DOWNLOAD EXAMIANS APP

Physics
It is easier to roll a barrel full of coal tar than to pull it because

more surface area of the barrel is in contact with the road when it is pulled
the rolling friction is much less than the sliding friction
the full weight of the barrel comes into play when it is pulled
coal tar is a liquid and it flows in the barrel when it is rolled

ANSWER DOWNLOAD EXAMIANS APP