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
Q. Which one of the following statements is true with regard to the greenhouse?
1) The shorter-wavelength infrared radiations from the Sun can enter into the greenhouse while longer-wavelength infrared radiations from the ground and the plants inside the greenhouse cannot pass back out through the glass
2) The shorter wavelength infrared radiation from the Sun can enter into the greenhouse and the longer wavelength infrared radiation from the ground and the plants inside the greenhouse can also pass back out through the glass
3) The shorter-wavelength infrared radiations from the Sun cannot enter into the greenhouse while longer-wavelength infrared radiations from the ground and the plants inside the greenhouse can pass back out through the glass
4) No infrared radiation can pass through the glass of the greenhouse
Q. The disease rickets develops in children due to the deficiency of -
1) Vitamin C
2) Vitamin D
3) Vitamin A
4) Vitamin B
Q. Plants prepare glucose in the process of -
1) respiration
2) photosynthesis
3) degradation
4) mineral absorption
Q. Which one of the following statements is correct about cell membranes?
1) It is made up of cellulose
2) It is a permeable structure for all substances
3) It is flexible and enables the cell to engulf many materials
4) It does not allow the diffusion of gases like oxygen and carbon dioxide
Q. Suppose, due to an accident, the delicate lining of the mouth and the oesophagus of a person is injured. In this case, which one of the following tissues will be affected?
1) Smooth muscle
2) Cuboidal epithelium
3) Squamous epithelium
4) Striated muscle
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