1391. What colour of visible light is the longest in wavelength ?
A. Violet
B. Blue
C. Red *
D. Green
1392. The gases which are used by divers as an artificial atmosphere are helium and :
A. Nitrogen
B. Oxygen *
C. Carbon Monoxide
D. Neon
1393. Which of the following is the most toxic gas ?
A. Carbon dioxide
B. Carbon monoxide *
C. Nitrogen dioxide
D. Carbon and Nitrogen
1394. Photosynthesis involves :
A. Reduction of CO2 and oxidation of water
B. Oxidation of water and emission of oxygen
C. Reduction of CO2 oxidation h2o and release of O2 *
D. Less CO2 oxidizing water and releasing oxygen
1395. How many yards make a furlong?
A. 220 *
B. 440
C. 100
D. 200
1396. The gas used for artificial ripening of green fruits ?
A. Acetylene *
B. Methane
C. Ethane
D. Butane
1397. Which is the rarest element in world ?
A. Astatine *
B. Uranium
C. Thorium
D. Radium
1398. The working of a rocket is based on the principal of ?
A. Newton’s law *
B. Flux Meter
C. Flux Rule
D. Boyle Law
1399. Filtration of wastes from the blood in human body is done by:
A. Kidney *
B. Lungs
C. Heart
D. Brain
1400. One horse power is equal to :
A. 736 watts
B. 746 watts *
C. 748 watts
D. 756 watts