With reference to pH value, consider the following statements.
1. Higher the hydronium Ion concentration, lower is the pH value.
2. Our body works within the pH range of 6.8 to 7.0.
Choose the incorrect statement using the code given below.

With reference to metals, consider the following statement.
1. When a base reacts with a metal, hydrogen gas is evolved and a corresponding salt is formed.
2. When an acid reacts with a metal, along with the evolution of hydrogen gas a salt is formed which has a negative ion composed of the metal and oxygen.
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Chips manufacturers usually flush bags of chips with gas such as nitrogen to prevent chips from getting oxidized. The process of oxidation of fats and oils called

What is/are the process by which rusting can be prevented?
1. Galvanizing
2. Oil coating of iron
3. Bluing
4. Dry coating
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Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons

With reference to ethanol fuel, consider the following statement.
1. Ethanol can be combined with petrol in any concentration up to pure ethanol (E100).
2. Ethanol helps prevent wintertime problems by acting as a gas-line antifreeze.
3. Ethanol-blended fuel keeps the fuel emissions clean for optimal performance, but it leaves gummy deposits on engine.
Choose the correct statement using the code given below.

Which of the following is chemical properties of metal?
1. Metals easily corrodible.
2. Metal form basic oxides.
3. Metals have low electronegativity.
4.Metals and Mouldable and Ductile
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Which of the following organism are not autotrophs?
1. Cyanobacteria
2. Fungi
3. Algae
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Consider the following statement, during the process of photosynthesis.
1. Absorption of light energy by chloroplast.
2. Water used in photosynthesis is taken up from the atmosphere by leaves.
Choose the incorrect statement using the code given below.

With reference to blood pressure, consider the following statement.
1. The pressure of blood in arteries is much greater than in veins.
2. The normal systolic pressure is about 120mm of Hg and diastolic pressure is 80mm of Hg.
Choose the incorrect statement using the code given below.

Which of the following completely digested in small intestine?
1. Carbohydrates
2. Vitamins
3. Proteins
4. Fats
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Consider the following statement about transportation in plant.
1. Xylem is responsible for the transportation of water and minerals obtained from the soil in the plant.
2. Phloem transports the product of photosynthesis from the leaves to other parts of the plant.
Which of the above statement is incorrect, choose the answer using the code given below?

Which of the following is correctly matched?
1. Cytokinins – Promote cell division
2. Auxin – Helps the cells to growth
3. Gibberellins – Inhibits growth
4. Abscisic acid – Helps in stem growth
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Which of the following is/are correctly matched?
1. Thyroxine – Metabolism of Carbohydrates
2. Adrenaline – Control salt and water balance
3. Melatonin – Metabolism of fats
4. Glucagon – decrease sugar level in blood
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Which of the following statement is correct about ecological niche?
1. Ecological niche involve only the habitat, where an organism live.
2. Organism can change their niche according to the changing environment.
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In which part of the female reproductive system, fertilization occurs?

Consider the following statements about reproduction in organisms.
1. In all organisms the process of fertilization takes place inside the female body.
2. The stage of the embryo in which all the body parts can be identified is called a zygote.
3. The development of embryo takes place in the Uterus.
Choose the correct statements using the code given below.

Which of the following cause(s) myopia?
1. The focal length of the eye lens become too long.
2. Elongation of the eyeball.
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What are the reasons behind rainbow formation on a sunny day when we look at the sky through waterfall?
1. Total internal reflection
2. Dispersion of light
3. Scattering of light
4. Refraction
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Which of the following phenomenon is caused by atmospheric refraction?
1. The sun is visible to us about 2 minutes before the actual sunrise.
2. Twinkling of star during night.
3. The apparent flattening of the Sun’s disc at sunrise and sunset.
4. Reddish appearance of the sun at the sunrise and sunset.
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Consider the following statement about ozone depleting substance.
1. Ozone depleting substance once released into the air these substances degrade very slowly.
2. All type of ozone naturally produced in the atmosphere.
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Which of the following are included under ozone depleting substance?
1. Methyl bromide
2. Methyl chloroform
3. Halons
4. Hydroflurocarbon
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Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
1. Good thermal conductivity
2. Good electrical conductivity
3. High melting point
4. Ductility
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With reference to flow of energy in the ecosystem, consider the following statement.
1. Relative loss of energy increases with increasing trophic levels.
2. Energy transfer in the ecosystem unidirectional.
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Soil erosion is always enhanced when the cleared area is on the steep slope. Which of the following method are appropriate to check the soil erosion in hilly region.
1. Contour ploughing
2. Terracing
3. Strip cropping
4. Jhum cultivation
Choose the correct answer using the code given below.

With reference to nuclear energy, consider the following statement.
1. Currently all commercial nuclear reactors are based on nuclear fusion.
2. Nuclear fission reactions are the source of energy in the sun and other stars.
3. The hydrogen bomb is based on thermonuclear fusion reaction.
Choose the correct statement using the code given below.

Which of the following are correctly matched?
1. Primary producer – Zooplankton
2. Primary consumer – Grasshopper
3. Secondary consumer – Man
4. Tertiary consumer – lion
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Which of the following organisms and their chief excretory product is correctly matched?
1. Man – Uric acid
2. Bird – Urea
3. Fish – Ammonia
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Which of the following are voluntary muscles?
1. Diaphragm
2. Pharynx
3. Abdominal wall tongue
4. Alimentary tracts
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In which of the following concave mirrors are used?
1. As a reflector for the headlights of a vehicle, searchlight.
2. In ophthalmoscope to examine the eye, ear, nose by doctors.
3. In solar cookers.
4. In sodium reflector lamp.
Choose the correct answer using the code given below.

Which of the statement is not correct about endocrine gland?
1. Hormone is a chemical produced by endocrine glands and released into the blood and transported
to a distantly located target organ.
2. Hormones are nutrient chemicals which act as intercellular messengers and are produced in trace amounts.
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Greenhouse effect is going to have major effect on the world. Which of the following are the effects of greenhouse?
1. Rise in the level of sea
2. Salinization of water bodies and soils
3. loss of biodiversity
4. Decrease in pest infestation
Choose the correct statement using the code given below.