Q. Which one of the following statements is correct about effects of antibiotics on viruses?
1) Viruses are 'non-living' entities but it can interact with antibiotics
2) Taking antibiotics cures viral infections
3) Viruses do not possess metabolic pathways on which antibiotics can function, whereas bacteria have such pathways
4) Viruses are resistant to antibiotics
Q. Which one of the following is not a component of human male reproductive system?
1) Cervix
2) Urethra
3) Seminal vesicle
4) Vas deferens
Q. Which one of the following is not a reason of 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 cause of depletion in groundwater?
1) Afforestation
2) Loss of forests
3) Excessive pumping of groundwater
4) Construction of large scale concrete buildings
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. 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 is the largest composition in biogas?
1) Carbon dioxide
2) Methane
3) Hydrogen
4) Hydrogen sulphide
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. A lens has a power of + 2.0 Diopter. 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 0.5 meter
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 meter
Q. At nearly 700C, sodium bicarbonate shows the property of gradually decomposing, which makes it usable in bakery products. The product of decomposition responsible for this use of sodium bicarbonate is -
1) Carbon dioxide
2) Hydrogen
3) Water vapour
4) Oxygen
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