Which of the following can be used to control the speed of a D. C. motor?
(a) Thermistor
(b) Thyristor-✔️
(c) Thyratron
(d) Transistor
Which acid is produced when milk gets sour?
(a) Tartaric acid
(b) Butyric acid
(c) Lactic acid-✔️
(d) Acetic acid
When the earth was formed it had an atmosphere with
(a) Hydrogen, Oxygen and Nitrogen
(b) Water vapour, Hydrogen and Oxygen
(c) Oxygen, Carbondioxide and Nitrogen
(d) Water vapour, Ammonia and Methane-✔️
When an ant bites a person, which irritating chemical it (ant) injects into his (person) body?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Formic acid-✔️
When 1 litre of water freezes, the volume of ice formed will be
(a) 0.9 litre
(b) 1.0 litre
(c) 1.11 litre-✔️
(d) 1.5 litre
What would be the best choice for window material to keep the outside heat away?
(a) Single-pane glass
(b) Double-pane glass without a gap in between
(c) Double-pane glass with water filled in between
(d) Double-pane glass with air in between-✔️
What is the bacterial disease in lime fruits?
(a) Phytophthora
(b) White rust
(c) Citrus canker-✔️
(d) Smut disease
Water boils at a lower temperature on the hills because
(a) It is cold on the hills
(b) There is less carbon dioxide on the hills
(c) There is a decrease in air pressure on the hills-✔️
(d) there is less oxygen
Washing soda is the common name for
(a) Calcium carbonate
(b) Calcium bicarbonate
(c) Sodium carbonate-✔️
(d) Sodium bicarbonate
Vitamin concerned with vision is
(a) Vitamin A-✔️
(b) Vitamin B1
(c) Vitamin B2
(d) Vitamin B6
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