#1 The magnetic field inside a long straight solenoid carrying current–
The magnetic field inside a long straight solenoid carrying current is uniform at all points.
#2 The coil in a heater is made of
Heating coils are commonly made up of metal alloys which are a combination of two or more elements. The most commonly used metal alloy is “Nichrome”. Nichrome is an alloy of nickel (80%) and chromium (20%).
#3 A body is falling freely under the action of gravity alone in vacuum. Which one of the following remains constant during the fall?
Mechanical energy is the ability of an object to do work. This energy is equal to the sum of kinetic and potential energy, it is always constant.
#4 Which one of the following common devices works on the basis of the principle of mutual induction?
Transformer is based on the principle of mutual induction.
#5 The pressure exerted on the ground by a man is greatest
Pressure is normal force per unit area, therefore, for lesser value of area pressure is greatest.