681. Which part of the earth is divided into 15 plates of various sizes?
A. Mesosphere
B. Stratosphere
C. Lithosphere
D. None
682. Which of the following are the compact clusters of alpha particles?
A. Electron and Proton
B. Two Protons and two Neutrons
C. Three protons and three Neutrons
D. None
683. At night, what do the Plants intake and release?
A. Oxygen – Carbon dioxide
B. Carbon dioxide – Oxygen
C. Oxygen – Carbon monoxide
D. Carbon monoxide – Oxygen
684. What produces the Urine?
A. Kidneys
B. Lungs
C. Large intestine
D. Liver
685. Which of the following is the Chemical name of vinegar?
A. Sodium Nitrate
B. Dilute acetic acid
C. Chloride of lime
D. Calcium
E. None of these
686. The Deficiency of which vitamin decreases hemoglobin production?
A. Biotin
B. Thiamine
C. Niacin
D. Pyridoxine
E. None of these
687. What is measured by the Hygrometer?
A. Speed of sound
B. Density of milk
C. Humidity of air
D. The specific gravity of liquids
E. None of these
688. What is the number of spark plugs that are needed in a diesel engine?
A. 2
B. 3
C. 0
D. 4
E. None of these
689. ______ is the most elastic
A. Steel
B. Rubber
C. Glass
D. Sponge
E. None of these
690. Which of the following is the Orbital period of planet Mercury around the sun?
A. 88 days
B. 365 days
C. 2 years
D. 98 days