(A) conduction and radiation (B) convection and radiation (C) conduction and convection (D) conduction, convection and radiation
The ans is D
Is it possible to read a book without opening it?
Which among the following was invented by Orville and Wilbur Wright, popularly known as Wright brothers, in 1903 ? (A) Submarine (B) Hovercraft (C) Helicopter (D) Aeroplane