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 *