31 The only mammal that can fly is

Bat

32 Theory of relativity was propounded by

Alfred Einstein

33 A glass tumber breaks when hot liquid is suddenly poured into it because of

Uneven expansion

34 The blood cells that supply oxygen to cell are

Red Blood Cells

35 The common name of clavicle bone is

Collar bone

36 Dynamite was discovered by

Alfred Nobel

37 The instrument used for recording the character and movement if heart is

Cardiograph

38 A person faint on account of

Insufficient supply of blood to the brain

39 Escape Velocity is the speed that a space satellite must attain to escape from the

Earth’s gravitational field

40 Soap helps in cleaning clothes because

It lowers the surface tension of the solution