A person going upto `10,000` feet high in a hot air ballon may develop severe pain in the ear due to

A planned building was going to be 100 feet long, 75 feet deep,and 300 feet high. The owner decides to increase the volume of the building by 10% without changing the dimensions of the depth and the height. What will be the new length of this building in feet?

A spherical balloon of radius 10 feet is in the open air. If angle of elevation of centre of the balloon from a point on the ground is 45^(@) and spherical balloon subtens on angle of 45^(@) on that point then how high is the centre of the balloon from the ground ?

Two persons A and B are trying to measure the value of acceleration due to gravity (g) of the earth. A goes high up in a ballon while B goes down in a mine. The value of 'g' measured by

The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is (a) 5 (b) 10 (c) 20 (d) 30

The cavities in teeth is often filled with alloy of metals to avoid bacterial infections. However, when a person with dental filling ehew an active metal like aluminium foil acceidently, he experiences severe pain in teeth. The pain is due to a spontaneous discharge of a galvanic cell reaction which is set inside the mouth of person. The active metal serve as anode and dental filling act as inert electrode on which reduction of O_(2) gas takes place. E_(Al^(3+)|Al)^(@)=-1.66 volt: E_(O_(2),H^(+)|H_(2)O)^(@)=+1.23 volt What is the net cell reaction assuming acidic conditions in the mouth?

A person with high fever may be breathing faster than normal. This faster breathing may be due to