An object of mass 0.75 kg is hanging from a string attached to roof. What will be the force applied by string on the object?

Correct option is B

The force applied by string on an object is known as tension as tension T = mg
Here m is mass of object which is 0.75 kg
G is the gravitational force exerted by Earth which is 9.8
Now T = 0.75 x 9.8 = 7.35 N
Hence the force applied by string on the object will be 7.35 N