Washing soda is the common name of:
(a) Calcium carbonate
(b) Calcium bicarbonate
(c) Sodium carbonate
(d) Sodium bicarbonate
Which of the following gases is lighter than air?
(a) Carbon dioxide
(b) Oxygen
(c) Ammonia
(d) Chlorine
At what temperature the rate of photosynthesis stops altogether?
(a) 40° C or above
(b) 20° C
(c) 35° C
(d) 30° C
The rate of breathing is regulated by:
(a) Amount of oxygen in the blood
(b) Amount of carbon dioxide in blood
(c) Amount of oxygen in the cells
(d) Amount of carbon dioxide in the cells
Which of the following metals was first discovered by man:
(a) Bronze
(b) Silver
(c) Iron
(d) Copper
Which synthetic fibre is known as artificial silk?
(a) Cotton
(b) Rayon
(c) Terylene
(d) Nylon
Wood is the main raw material for the manufacture of:
(a) Paint
(b) Paper
(c) Ink
(d) Gunpowder
One horse power is equal to:
(a) 736 watts
(b) 746 watts
(c) 758 watts
(d) 768 watts
Electric current is measured by:
(a) Anemometer
(b) Voltmeter
(c) Ammeter
(d) Commutator
Which of the following is not an endocrine gland?
(a) Thyroid
(b) Adrenal
(c) Spleen
(d) Pituitary