At which of the following place, weight of an object is maximum?
At poles
At equator
At tropic of Capricorn
At tropic of cancer
A.
At poles
Which of the following is a characteristic of an exothermic reaction?
Release of heat
Absorption of heat
Doesn't involve any change in temperature
None of the option is correct
Optical fibre works on which of the following principle of light?
Reflection
Refraction
Diffraction
Total internal reflection
If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used
Concave
Convex
Cylindrical
Plane
Electric Motor converts ................ energy to mechanical energy.
sound
mechanical
chemical
electrical
Why does the tank appear shallower when viewed from the top?
Due to reflection
Due to refraction
Due to diffraction
Due to total internal reflection