1421. The unit of measuring intensity of noise is called :

A. Knot
B. Calorie
C. Ohm
D. Decibel *

1422. Which of the following is not considered a primary colour of light ?

A. Green
B. Blue
C. Red
D. Yellow *

1423. Name of scientist who first declared that the earth revolves around the sun:

A. Newton
B. Galileo
C. Copemicus *
D. None of these

1424. Which of the following takes place due to surface tension?

A. Gravitation pull
B. Capillary action *
C. Viscosity
D. Radiation

1425. Epiphytic and parasitic plants grow on which of the following ?

A. Plains
B. Rocks
C. Sea
D. Plants *

1426. There is no neutron in the atom of :

A. Carbon
B. Nitrogen *
C. Hydrogen
D. Ozone

1427. What is RDX?

A. An instrument
B. A gene
C. A fertilizer
D. An Explosive *

1428. What is the only element that burns with nitrogen ?

A. Fluorine
B. Titanium *
C. Antimony
D. Manganese

1429. What do you call the positive electrode of and electric cell?

A. Diode
B. Anode
C. Grid
D. Cathode *

1430. What do you call the negative electrode of and electric cell?

A. Diode
B. Anode
C. Grid
D. Cathode *