31. The lustre of diamond is due to
(a) Reflection
(b) Total internal reflection
(c) Refraction
(d) None of these
32. Circulation of blood in the body was discovered by
(a) Joseph Lister
(b) Roberal Hooke
(c) Jonas Salk
(d) William Harvey
33. Rust is disease which efffects wheat. It is caused by
(a) Bacteria
(b) Fungi
(c) Virus
(d) None of these
34. The other name of vitamin C is
(a) Formic acid
(b) Acetic acid
(c) Ascorbic acid
(d) None of these
35. Cellulose is a
(a) Fat
(b) Carbohydrates
(c) Protein
(d) None of These
36. Which of the following statements in regard to diabetes is not correct?
(a) It is a disease of metabolism
(b) It occurs when the blood sugar level decreases
(c) If not controlled, it results in loss of weight
(d) None of These
37. Hygrometer is used for measuring the
(a) Speed of sound
(b) Density of Milk
(c) Humidity of Air
(d) None of These
38. Which of the following is non-metal?
(a) Mercury
(b) Magnesium
(c) Manganese
(d) Silicon
39. Which of the following pairs is not correct?
(a) Barometer – Torricelli
(b) Telescope – Galileo
(c) Aeroplane – Wright Brothers
(d) Bicycle – Edison
40. Bauxite is an ore of
(a) Copper
(b) Iron
(c) Aluminium
(d) None of These