Q. Hyphae are -
1) produced by yeast
2) thin threads formed by many fungi
3) reproductive cells
4) responsible for preventing the cell from losing water in wet conditions
Q. Yeast, which is used to make bread, belongs to the group -
1) Protista
2) Fungi
3) Monera
4) Protozoa
Q. Mutation in a virus is caused due to a change in its -
1) cell size
2) genetic material
3) shape
4) colour
Q. Which one of the following is the main reason for acid rain?
1) Dissolution of sulphur and nitrogen oxides in rain
2) Dissolution of minerals in rain
3) Dissolution of dust particles in the rain
4) Dissolution of soil solution in rain
Q. Which one of the following living organisms gives litmus?
1) Protozoa
2) Virus
3) Lichen
4) Saccharomyces
Q. Which of the following mineral acids is found in the human stomach?
1) Hydrochloric acid
2) Lactic acid
3) Uric acid
4) Methanoic acid
Q. Which one of the following statements about biogas is not correct?
1) It is mainly composed of methane gas
2) It is a non-renewable source of energy
3) It is formed by the decomposition of cow dung in the absence of oxygen
4) It burns without smoke and leaves no residue
Q. A convex lens has a focal length of 15 cm. At what distance should an object be placed in front of the lens to get a real image of the same size as the object?
1) 15 cm
2) 10 cm
3) 30 cm
4) 40 cm
Q. The twinkling of a star is due to -
1) atmospheric reflection of starlight
2) atmospheric refraction of starlight
3) continuous change in the position of the star
4) oscillation of starlight
Q. An object weighs 9 N on the surface of the Earth. What would be its weight, when measured on the surface of a planet where the acceleration due to gravity is 9 times that on the surface of the Earth?
1) The weight would remain the same
2) The weight would be equal to 1 N
3) The weight would become 9 times
4) The weight will be reduced to 1/9 N
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