Q. The number of molecules of water of crystallization in copper Sulphate, Sodium carbonate, and gypsum is -
1) 5, 10, and 2 respectively
2) 10, 2, and 5 respectively
3) 5, 2, and 10 respectively
4) 2, 5, and 10 respectively
Q. At nearly 70°C, sodium bicarbonate shows the property of r&dually decomposing, which makes it sable in bakery products. The product T decomposition responsible for this use of sodium bicarbonate is -
1) Carbon dioxide
2) Hydrogen
3) Water vapour
4) Oxygen
Q. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
1) The lens is concave and has a focal length of 0.5 meter
2) The lens is convex and has a focal length of 2.0 metre
3) The lens is convex and has a focal length of 0.5 meter
4) The lens is concave and has a focal length of 2.0 meters
Q. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is -
1) Reflection
2) Total internal reflection
3) Scattering
4) Interference
Q. Which one of the following is the largest composition in biogas?
1) Carbon dioxide
2) Methane
3) Hydrogen
4) Hydrogen sulphide
Q. The instrument used for detecting the presence of electric current in a circuit is -
1) Refractometer
2) Galvanometer
3) Viscometer
4) Diffractometer
Q. Which one of the following types of radiations has the smallest wavelength?
1) Microwaves
2) Infra-red
3) Visible light
4) X-rays
Q. Which one of the following is NOT a cause of depletion in groundwater?
1) Afforestation
2) Loss of forests
3) Excessive pumping of groundwater
4) Construction of large-scale concrete building
Q. Which one of the following is NOT a reason for the decrease in biodiversity?
1) Large scale deforestation
2) Exploitation of forest produce
3) Maintaining sacred groves
4) Encroachment in forest areas
Q. Which one of the following is NOT a component of the human male reproductive system?
1) Cervix
2) Urethra
3) Seminal vesicle
4) Vas deferens
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